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Artículos de revistas sobre el tema "Double Oxygen Reduction"

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Publicado: 6 de septiembre de 2023

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1

Mladenović, Dušan, Milica Vujković, Slavko Mentus, Diogo M. F. Santos, Raquel P. Rocha, Cesar A. C. Sequeira, Jose Luis Figueiredo y Biljana Šljukić. "Carbon-Supported Mo2C for Oxygen Reduction Reaction Electrocatalysis". Nanomaterials 10, n.º 9 (10 de septiembre de 2020): 1805. http://dx.doi.org/10.3390/nano10091805.

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Molybdenum carbide (Mo2C)-based electrocatalysts were prepared using two different carbon supports, commercial carbon nanotubes (CNTs) and synthesised carbon xerogel (CXG), to be studied from the point of view of both capacitive and electrocatalytic properties. Cation type (K+ or Na+) in the alkaline electrolyte solution did not affect the rate of formation of the electrical double layer at a low scan rate of 10 mV s−1. Conversely, the different mobility of these cations through the electrolyte was found to be crucial for the rate of double-layer formation at higher scan rates. Molybdenum carbide supported on carbon xerogel (Mo2C/CXG) showed ca. 3 times higher double-layer capacity amounting to 75 mF cm−2 compared to molybdenum carbide supported on carbon nanotubes (Mo2C/CNT) with a value of 23 mF cm−2 due to having more than double the surface area size. The electrocatalytic properties of carbon-supported molybdenum carbides for the oxygen reduction reaction in alkaline media were evaluated using linear scan voltammetry with a rotating disk electrode. The studied materials demonstrated good electrocatalytic performance with Mo2C/CXG delivering higher current densities at more positive onset and half-wave potential. The number of electrons exchanged during oxygen reduction reaction (ORR) was calculated to be 3, suggesting a combination of four- and two-electron mechanism.
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2

Yin, Jiao, Jianbo Jia y Liande Zhu. "Double-template synthesis of platinum nanomaterials for oxygen reduction". Microchimica Acta 166, n.º 1-2 (3 de junio de 2009): 151–56. http://dx.doi.org/10.1007/s00604-009-0178-7.

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3

Lee, Dong-Gyu, Su Hwan Kim, Jiyun Lee, Seokmin Shin, Se Hun Joo, Yeongdae Lee, Chanhyun Park, Youngkook Kwon, Sang Kyu Kwak y Hyun-Kon Song. "Double activation of oxygen intermediates of oxygen reduction reaction by dual inorganic/organic hybrid electrocatalysts". Nano Energy 86 (agosto de 2021): 106048. http://dx.doi.org/10.1016/j.nanoen.2021.106048.

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4

Kumar, Sachin, Monika Singh, Raj Pal, Uday Pratap Azad, Ashish Kumar Singh, Divya Pratap Singh, Vellaichamy Ganesan, Akhilesh Kumar Singh y Rajiv Prakash. "Lanthanide based double perovskites: Bifunctional catalysts for oxygen evolution/reduction reactions". International Journal of Hydrogen Energy 46, n.º 33 (mayo de 2021): 17163–72. http://dx.doi.org/10.1016/j.ijhydene.2021.02.141.

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5

HORITA, Kiyoshi, Gentaro KANO y Tomoo TAKASAWA. "Oxygen-reduction performance and wettability of double-layered gas diffusion electrodes." Journal of the Society of Materials Science, Japan 40, n.º 448 (1991): 84–88. http://dx.doi.org/10.2472/jsms.40.84.

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6

Ogasawara, H., L. A. Naslund, J. McNaughton, T. Anniyev y Anders Nilsson. "Double Role of Water in the Fuel Cell Oxygen Reduction Reaction". ECS Transactions 16, n.º 2 (18 de diciembre de 2019): 1385–94. http://dx.doi.org/10.1149/1.2981979.

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7

Devoille, Aline M. J. y Jason B. Love. "Double-pillared cobalt Pacman complexes: synthesis, structures and oxygen reduction catalysis". Dalton Trans. 41, n.º 1 (2012): 65–72. http://dx.doi.org/10.1039/c1dt11424g.

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8

Ogura, Hiroyuki, Yasoshi Ito y Tamotsu Shirogami. "Oxygen Reduction Mechanism in Molten Carbonates by Current Double Pulse Method". IEEJ Transactions on Power and Energy 119, n.º 3 (1999): 388–93. http://dx.doi.org/10.1541/ieejpes1990.119.3_388.

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9

Wu, Jianbo, Zhenmeng Peng y Hong Yang. "Supportless oxygen reduction electrocatalysts of CoCuPt hollow nanoparticles". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 368, n.º 1927 (28 de septiembre de 2010): 4261–74. http://dx.doi.org/10.1098/rsta.2010.0128.

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This paper describes a facile solution route to the synthesis of CoCuPt hollow nanoparticles that readily form chain-like structures in solution. The formation of porous CoCuPt nanostructure is through galvanic replacement with cobalt-containing cores as the templates. This approach does not require the further removal of templates and greatly simplifies the synthetic procedures. These porous CoCuPt nanoparticles can be used as supportless electrocatalysts that exhibit enhanced mass- and area-specific activities in the oxygen reduction reaction (ORR) over commercial Pt black catalysts. The highest ORR specific activity achieved so far for this ternary Pt-alloy catalyst is 0.37 mA cm −2 Pt which is more than double that for Pt black.
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10

Onaka-Masada, Ayumi, Takeshi Kadono, Ryosuke Okuyama, Ryo Hirose, Koji Kobayashi, Akihiro Suzuki, Yoshihiro Koga y Kazunari Kurita. "Reduction of Dark Current in CMOS Image Sensor Pixels Using Hydrocarbon-Molecular-Ion-Implanted Double Epitaxial Si Wafers". Sensors 20, n.º 22 (19 de noviembre de 2020): 6620. http://dx.doi.org/10.3390/s20226620.

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The impact of hydrocarbon-molecular (C3H6)-ion implantation in an epitaxial layer, which has low oxygen concentration, on the dark characteristics of complementary metal-oxide-semiconductor (CMOS) image sensor pixels was investigated by dark current spectroscopy. It was demonstrated that white spot defects of CMOS image sensor pixels when using a double epitaxial silicon wafer with C3H6-ion implanted in the first epitaxial layer were 40% lower than that when using an epitaxial silicon wafer with C3H6-ion implanted in the Czochralski-grown silicon substrate. This considerable reduction in white spot defects on the C3H6-ion-implanted double epitaxial silicon wafer may be due to the high gettering capability for metallic contamination during the device fabrication process and the suppression effects of oxygen diffusion into the device active layer. In addition, the defects with low internal oxygen concentration were observed in the C3H6-ion-implanted region of the double epitaxial silicon wafer after the device fabrication process. We found that the formation of defects with low internal oxygen concentration is a phenomenon specific to the C3H6-ion-implanted double epitaxial wafer. This finding suggests that the oxygen concentration in the defects being low is a factor in the high gettering capability for metallic impurities, and those defects are considered to directly contribute to the reduction in white spot defects in CMOS image sensor pixels.
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11

Cowie, Bradley E., Gary S. Nichol, Jason B. Love y Polly L. Arnold. "Double uranium oxo cations derived from uranyl by borane or silane reduction". Chemical Communications 54, n.º 31 (2018): 3839–42. http://dx.doi.org/10.1039/c8cc00341f.

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12

Li, Lingfeng, Binling Chen, Zeyuan Zhuang, Jun Nie y Guiping Ma. "Core-double shell templated Fe/Co anchored carbon nanospheres for oxygen reduction". Chemical Engineering Journal 399 (noviembre de 2020): 125647. http://dx.doi.org/10.1016/j.cej.2020.125647.

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13

Wang, Li, Hui Li, Jieyu Liu, Xiuyao Lang y Weichao Wang. "Labile oxygen participant adsorbate evolving mechanism to enhance oxygen reduction in SmMn2O5 with double-coordinated crystal fields". Journal of Materials Chemistry A 9, n.º 1 (2021): 380–89. http://dx.doi.org/10.1039/d0ta09537k.

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14

Zeng, Jie Qiong y Hong Yu. "Oxidation-Induced Redshifts in the Energy Gap of Silicon Quantum Dots". Key Engineering Materials 562-565 (julio de 2013): 852–57. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.852.

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To investigate the effects of Si/O bond at the surface of silicon quantum dots (Si QDs) on the electronic properties of Si QDs, first principle calculations have been performed for Si QDs consisting of 10-87 Si atoms (0.6-1.5 nm in diameter) by using the CASTEP software package. In these calculations the Si dangling bonds on the surface of Si QDs are passivated by hydrogen atoms and oxygen. Four different oxygen configurations have been studied, they are double-bonded, backbonded, bridge-bonded and inserted, respectively. We find that a significant reduction of energy gap is caused by the presence of double-bonded oxygen, whereas for other three oxygen configurations there is just a slight reduction on energy gap. As a result, the model which contains Si=O bond is considered the most appropriate to explain the photoluminescence redshifts in oxidized porous silicon.
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15

Wang, Yinghui, Xing Ding, Fan Wang, Junqi Li, Shuyan Song y Hongjie Zhang. "Nanoconfined nitrogen-doped carbon-coated MnO nanoparticles in graphene enabling high performance for lithium-ion batteries and oxygen reduction reaction". Chemical Science 7, n.º 7 (2016): 4284–90. http://dx.doi.org/10.1039/c5sc04668h.

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16

Sen, Dipayan, Ranjit Thapa y Kalyan Kumar Chattopadhyay. "A first-principles investigation of oxygen reduction reaction catalysis capabilities of As decorated defect graphene". Dalton Trans. 43, n.º 40 (2014): 15038–47. http://dx.doi.org/10.1039/c4dt01258e.

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17

Kumar, T. Satish, S. Rajesh Kumar, M. Lakshmipathi Rao y T. L. Prakash. "Preparation of Niobium Metal Powder by Two-Stage Magnesium Vapor Reduction of Niobium Pentoxide". Journal of Metallurgy 2013 (19 de agosto de 2013): 1–6. http://dx.doi.org/10.1155/2013/629341.

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Magnesium vapor reduction of niobium pentoxide was studied using a laboratory system. Niobium powder was prepared by the magnesium vapor reduction at 1123 K for 5 hours and it contained about 8 mass % oxygen. However, the oxygen concentration could be decreased to 0.65% when it was prepared by double-step reduction by magnesium vapor and a chemical treatment. Controlled and diluted supply of magnesium vapor to the reaction front has averted excess heat generation at the reaction front and thereby fine particles were produced. Effects of various factors on the vapor reduction process were studied and discussed.
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18

Zhou, Wei, Jaka Sunarso, Zhi-Gang Chen, Lei Ge, Julius Motuzas, Jin Zou, Guoxiong Wang, Anne Julbe y Zhonghua Zhu. "Novel B-site ordered double perovskite Ba2Bi0.1Sc0.2Co1.7O6−xfor highly efficient oxygen reduction reaction". Energy Environ. Sci. 4, n.º 3 (2011): 872–75. http://dx.doi.org/10.1039/c0ee00451k.

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19

Selektor, S. L., A. V. Shokurov, A. A. Revina, V. V. Arslanov, Yu G. Gorbunova y A. Yu Tsivadze. "The Role of Oxygen in Electrochemical Reduction of Double-Decker Phthalocyaninates of Lanthanides". Macroheterocycles 8, n.º 2 (2015): 135–42. http://dx.doi.org/10.6060/mhc150765s.

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20

Iwai, Yu, Akira Miura, Nataly Carolina Rosero-Navarro, Mikio Higuchi y Kiyoharu Tadanaga. "Composition, valence and oxygen reduction reaction activity of Mn-based layered double hydroxides". Journal of Asian Ceramic Societies 7, n.º 2 (27 de febrero de 2019): 147–53. http://dx.doi.org/10.1080/21870764.2019.1581321.

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21

Zhang, Xuemei, Yinling Wang, Shengye Dong y Maoguo Li. "Dual-site polydopamine spheres/CoFe layered double hydroxides for electrocatalytic oxygen reduction reaction". Electrochimica Acta 170 (julio de 2015): 248–55. http://dx.doi.org/10.1016/j.electacta.2015.04.170.

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22

Hu, Han, Lei Han, Mengzhou Yu, Zhiyu Wang y Xiong Wen (David) Lou. "Metal–organic-framework-engaged formation of Co nanoparticle-embedded carbon@Co9S8 double-shelled nanocages for efficient oxygen reduction". Energy & Environmental Science 9, n.º 1 (2016): 107–11. http://dx.doi.org/10.1039/c5ee02903a.

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23

Chen, Tao, Shengli Pang, Xiangqian Shen, Xuening Jiang y Wenzhi Wang. "Evaluation of Ba-deficient PrBa1−xFe2O5+δ oxides as cathode materials for intermediate-temperature solid oxide fuel cells". RSC Advances 6, n.º 17 (2016): 13829–36. http://dx.doi.org/10.1039/c5ra19555a.

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24

Xia, Wei, Michelle A. Hunter, Jiayu Wang, Guoxun Zhu, Sarah J. Warren, Yingji Zhao, Yoshio Bando, Debra J. Searles, Yusuke Yamauchi y Jing Tang. "Highly ordered macroporous dual-element-doped carbon from metal–organic frameworks for catalyzing oxygen reduction". Chemical Science 11, n.º 35 (2020): 9584–92. http://dx.doi.org/10.1039/d0sc02518f.

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Multiple heteroatoms-doped carbon with 3D ordered macroporous structures, which showing outstanding catalytic activity for oxygen reduction, was prepared by carbonization of double-solvent-induced MOF/polystyrene sphere accompanied with post-doping.
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25

Chen, Yubo, Jian Shen, Guangming Yang, Wei Zhou y Zongping Shao. "A single-/double-perovskite composite with an overwhelming single-perovskite phase for the oxygen reduction reaction at intermediate temperatures". Journal of Materials Chemistry A 5, n.º 47 (2017): 24842–49. http://dx.doi.org/10.1039/c7ta07760b.

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26

Dhongde, Vicky, Uzma Anjum, Ajay Kumar, Rajendra Dhaka, Mohammad Ali Haider y Suddhasatwa Basu. "(Digital Presentation) Understanding the Rate Limiting Process in a Pulse Laser Deposited Thin-Film Double Perovskite Electrode for Oxygen Reduction Reaction". ECS Meeting Abstracts MA2022-01, n.º 37 (7 de julio de 2022): 1633. http://dx.doi.org/10.1149/ma2022-01371633mtgabs.

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Oxygen reduction reaction (ORR) in a double perovskite material is considered to be the most sluggish reaction in the intermediate temperature operation of a solid oxide fuel cell (SOFC). ORR is often inhibited by poor oxygen surface exchange rates or bulk diffusion in the material. In order to understand the rate-limiting process of the material, we have fabricated a dense thin-film double perovskite of composition Sr2CoNbO6- δ. The pulse laser deposition (PLD) method is employed to fabricate geometrically well-defined symmetric electrodes of SCN on an electrolyte substrate for accurate assessment of electrode impedance. Electrode thickness is varied from 40 nm to 80 nm by changing the deposition parameters in PLD. On increasing the thickness, the electrode impedance is observed to increase, suggesting bulk diffusion of oxygen anions limiting the electrochemical performance in the electrode material.
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27

Kim, Nam-In, Sung-Hwa Cho, Se Hwan Park, Young Joo Lee, Rana Arslan Afzal, Jeseung Yoo, Young-Soo Seo, Yun Jung Lee y Jun-Young Park. "B-site doping effects of NdBa0.75Ca0.25Co2O5+δ double perovskite catalysts for oxygen evolution and reduction reactions". Journal of Materials Chemistry A 6, n.º 36 (2018): 17807–18. http://dx.doi.org/10.1039/c8ta06236f.

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NdBa0.75Ca0.25Co2O5+δ-based double perovskite catalysts provide new ways for significantly enhanced oxygen-related electrochemical reactions with durable characteristics in alkaline atmospheres.
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28

Prato M., Rafael A., Vincent Van Vught, Kudakwashe Chayambuka, Guillermo Pozo, Sam Eggermont, Jan Fransaer y Xochitl Dominguez-Benetton. "Synthesis of material libraries using gas diffusion electrodes". Journal of Materials Chemistry A 8, n.º 23 (2020): 11674–86. http://dx.doi.org/10.1039/d0ta00633e.

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Gas-diffusion electrocrystallization (GDEx), driven by oxygen reduction, produces libraries of nanostructures, including birnessites, cubic spinels, tetragonal spinels, and layered double hydroxides, with Co2+ and Mn2+ as metal precursors.
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29

Matsuoka, Fumiaki, Kevin E. Fritz, Peter A. Beaucage, Fei Yu, Jin Suntivich y Ulrich Wiesner. "Iron and nitrogen-doped double gyroid mesoporous carbons for oxygen reduction in acidic environments". Journal of Physics: Energy 3, n.º 1 (13 de noviembre de 2020): 015001. http://dx.doi.org/10.1088/2515-7655/abc31a.

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30

Kibsgaard, Jakob, Ariel Jackson y Thomas F. Jaramillo. "Mesoporous platinum nickel thin films with double gyroid morphology for the oxygen reduction reaction". Nano Energy 29 (noviembre de 2016): 243–48. http://dx.doi.org/10.1016/j.nanoen.2016.05.005.

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31

Ju, Young-Wan, Junji Hyodo, Atsushi Inoishi, Shintaro Ida, Tetsuya Tohei, Yeong-Gi So, Yuichi Ikuhara y Tatsumi Ishihara. "Double Columnar Structure with a Nanogradient Composite for Increased Oxygen Diffusivity and Reduction Activity". Advanced Energy Materials 4, n.º 17 (17 de julio de 2014): 1400783. http://dx.doi.org/10.1002/aenm.201400783.

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32

Jiang, Rongzhong, Dat T. Tran y Joshua P. McClure. "Non-precious Mn1.5Co1.5O4–FeNx/C nanocomposite as a synergistic catalyst for oxygen reduction in alkaline media". RSC Advances 6, n.º 73 (2016): 69167–76. http://dx.doi.org/10.1039/c6ra15040c.

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33

Tsvetkov, D. S., I. L. Ivanov, D. A. Malyshkin y A. Yu Zuev. "Oxygen content, cobalt oxide exsolution and defect structure of the double perovskite PrBaCo2O6−δ". Journal of Materials Chemistry A 4, n.º 5 (2016): 1962–69. http://dx.doi.org/10.1039/c5ta08390g.

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34

Beiranvand, A., M. O. Liedke, C. Haalisto, V. Lähteenlahti, A. Schulman, S. Granroth, H. Palonen et al. "Manipulating magnetic and magnetoresistive properties by oxygen vacancy complexes in GCMO thin films". Journal of Physics: Condensed Matter 34, n.º 15 (10 de febrero de 2022): 155804. http://dx.doi.org/10.1088/1361-648x/ac4eac.

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Abstract The effect of in situ annealing is investigated in Gd0.1Ca0.9MnO3 (GCMO) thin films in oxygen and vacuum atmospheres. We show that the reduction of oxygen content in GCMO lattice by vacuum annealing induced more oxygen complex vacancies in both subsurface and interface regions and larger grain domains when compared with the pristine one. Consequently, the double exchange interaction is suppressed and the metallic-ferromagnetic state below Curie temperature turned into spin-glass insulating state. In contrast, the magnetic and resistivity measurements show that the oxygen treatment increases ferromagnetic phase volume, resulting in greater magnetization (M S) and improved magnetoresistivity properties below Curie temperature by improving the double exchange interaction. The threshold field to observe the training effect is decreased in oxygen treated film. In addition, the positron annihilation spectroscopy analysis exhibits fewer open volume defects in the subsurface region for oxygen treated film when compared with the pristine sample. These results unambiguously demonstrate that the oxygen treated film with significant spin memory and greater magnetoresistance can be a potential candidate for the future memristor applications.
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35

Tang, Jinyu, Lu Yao, Xiaoru Ren, Zhiyu Shao, Minmin Cai, Lu Gao y Xiaofeng Wu. "Regulating oxygen vacancies in Co3O4 by combining solution reduction and Ni2+ impregnation for oxygen evolution reaction". Nanotechnology 33, n.º 9 (6 de diciembre de 2021): 095701. http://dx.doi.org/10.1088/1361-6528/ac3beb.

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Abstract Oxygen vacancies are considered to be an important factor to influence the electronic structure and charge transport of electrocatalysts in the field of energy chemistry. Various strategies focused on oxygen vacancy engineering are proved to be efficient for further improving the electrocatalytic performance of Co3O4. Herein, an optimal Co3O4 with rich oxygen vacancies have been synthesized via a two-step process combining solution reduction and Ni2+ impregnation. The as-prepared electrocatalyst exhibits an enhanced oxygen evolution performance with the overpotential of 330 mV at the current density of 10 mA cm−2 in alkaline condition, which is 84 mV lower than that of pristine one. With the increasing of oxygen vacancies, the charge transfer efficiency and surface active area are relatively enhanced reflected by the Tafel slope and double-layer capacitance measurement. These results indicate that combination of solution reduction and heteroatom doping can be a valid way for efficient metal oxides-based electrocatalyst development by constructing higher concentration of oxygen vacancy.
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36

Rupar, Jelena, Armin Hrnjić, Snežana Uskoković-Marković, Danica Bajuk-Bogdanović, Maja Milojević-Rakić, Nemanja Gavrilov y Aleksandra Janošević Ležaić. "Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction". Polymers 15, n.º 15 (26 de julio de 2023): 3169. http://dx.doi.org/10.3390/polym15153169.

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Electrochemical crosslinking of alginate strands by in situ iron oxidation was explored using a potentiostatic regime. Carbon-based materials co-doped with iron, nitrogen, and/or sulfur were prepared via electrolyte composition variation with a nitrogen-rich compound (rivanol) or through post-treatments with sodium sulfide. Nanometer-sized iron particles were confirmed by transmission and field emission scanning electron microscopy in all samples as a consequence of the homogeneous dispersion of iron in the alginate scaffold and its concomitant growth-limiting effect of alginate chains. Raman spectra confirmed a rise in structural disorder with rivanol/Na2S treatment, which points to more defect sites and edges known to be active sites for oxygen reduction. Fourier transform infrared (FTIR) spectra confirmed the presence of different iron, nitrogen, and sulfur species, with a marked difference between Na2S treated/untreated samples. The most positive onset potential (−0.26 V vs. saturated calomel electrode, SCE) was evidenced for the sample co-doped with N, S, and Fe, surpassing the activity of those with single and/or double doping. The mechanism of oxygen reduction in 0.1 M KOH was dominated by the 2e− reduction pathway at low overpotentials and shifted towards complete 4e− reduction at the most negative explored values. The presented results put forward electrochemically formed alginate gels functionalized by homogeneously dispersed multivalent cations as an excellent starting point in nanomaterial design and engineering.
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37

Draper, Shane, Tyler Singer, Cody Dulaney y John McDaniel. "Single Leg Cycling Offsets Reduced Muscle Oxygenation in Hypoxic Environments". International Journal of Environmental Research and Public Health 19, n.º 15 (26 de julio de 2022): 9139. http://dx.doi.org/10.3390/ijerph19159139.

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The intensity of large muscle mass exercise declines at altitude due to reduced oxygen delivery to active muscles. The purpose of this investigation was to determine if the greater limb blood flow during single-leg cycling prevents the reduction in tissue oxygenation observed during traditional double-leg cycling in hypoxic conditions. Ten healthy individuals performed bouts of double and single-leg cycling (4, four-minute stages at 50–80% of their peak oxygen consumption) in hypoxic (15% inspired O2) and normoxic conditions. Heart rate, mean arterial pressure, femoral blood flow, lactate, oxygenated hemoglobin, total hemoglobin, and tissue saturation index in the vastus lateralis were recorded during cycling tests. Femoral blood flow (2846 ± 912 mL/min) and oxygenated hemoglobin (−2.98 ± 3.56 au) during single-leg cycling in hypoxia were greater than double-leg cycling in hypoxia (2429 ± 835 mL/min and −6.78 ± 3.22 au respectively, p ≤ 0.01). In addition, tissue saturation index was also reduced in the double-leg hypoxic condition (60.2 ± 3.1%) compared to double-leg normoxic (66.0 ± 2.4%, p = 0.008) and single-leg hypoxic (63.3 ± 3.2, p < 0.001) conditions. These data indicate that while at altitude, use of reduced muscle mass exercise can help offset the reduction in tissue oxygenation observed during larger muscle mass activities allowing athletes to exercise at greater limb/muscle specific intensities.
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38

Fan, Rui, Ning Kang, Yuzhen Li y Lizhen Gao. "A template-directed synthesis of metal–organic framework (MOF-74) ultrathin nanosheets for oxygen reduction electrocatalysis". RSC Advances 11, n.º 16 (2021): 9353–60. http://dx.doi.org/10.1039/d0ra09973b.

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Layered double hydroxide (LDH) is employed as a layered template to synthesize ultrathin Ni-MOF-74 nanosheets. The two-dimensional structure brings numerous exposed unsaturated active sites and enhanced conductivity for Ni-MOF-74.
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39

Hou, Meiling, Xin Zhang, Shandong Yuan y Wanglai Cen. "Double graphitic-N doping for enhanced catalytic oxidation activity of carbocatalysts". Physical Chemistry Chemical Physics 21, n.º 10 (2019): 5481–88. http://dx.doi.org/10.1039/c8cp07317a.

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Double-GrN remarkably enhanced the catalytic efficiency for O2 dissociation reactions and accelerates the generation of highly chemically reactive oxygen functional groups. The promotion effect is ascribed to the reduction of the work function of carbocatalysts due to N doping, which facilitates the transfer of electrons from carbocatalysts to the adsorbed O2 molecules for their activation.
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40

Palakkal, Jasnamol P., Thorsten Schneider y Lambert Alff. "Oxygen defect engineered magnetism of La2NiMnO6 thin films". AIP Advances 12, n.º 3 (1 de marzo de 2022): 035116. http://dx.doi.org/10.1063/9.0000360.

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The double perovskite La2NiMnO6 (LNMO) exhibits complex magnetism due to the competition of magnetic interactions that are strongly affected by structural and magnetic inhomogeneities. In this work, we study the effect of oxygen annealing on the structure and magnetism of epitaxial thin films grown by pulsed laser deposition. The key observations are that a longer annealing time leads to a reduction of saturation magnetization and an enhancement in the ferromagnetic transition temperature. We explain these results based upon epitaxial strain and oxygen defect engineering. The oxygen enrichment by annealing caused a decrease in the volume of the perovskite lattice. This increased the epitaxial strain of the films that are in-plane locked to the SrTiO3 substrate. The enhanced strain caused a reduction in the saturation magnetization due to randomly distributed anti-site defects. The reduced oxygen defects concentration in the films due to the annealing in oxygen improved the ferromagnetic long-range interaction and caused an increase in the magnetic transition temperature.
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41

Wang, Jia X., Junliang Zhang y Radoslav R. Adzic. "Double-Trap Kinetic Equation for the Oxygen Reduction Reaction on Pt(111) in Acidic Media†". Journal of Physical Chemistry A 111, n.º 49 (diciembre de 2007): 12702–10. http://dx.doi.org/10.1021/jp076104e.

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42

Liang, Jiaxiang, Yun Zhang, Chencheng Song, Diyong Tang y Jie Sun. "Double-potential electro-Fenton: A novel strategy coupling oxygen reduction reaction and Fe2+/Fe3+ recycling". Electrochemistry Communications 94 (septiembre de 2018): 55–58. http://dx.doi.org/10.1016/j.elecom.2018.08.006.

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43

Xu, Yong, Jiang Mo, Qiang Liu, Xiaoxia Wang y Shujiang Ding. "Self-assembled CoTiO3 nanorods with controllable oxygen vacancies for the efficient photochemical reduction of CO2 to CO". Catalysis Science & Technology 10, n.º 7 (2020): 2040–46. http://dx.doi.org/10.1039/c9cy02202c.

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CoTiO3 with oxygen vacancies was used as a cocatalyst for the photochemical reduction of CO2 to CO. The bond length of the double bond between C and O in CO2 increases from 1.17 Å to 1.25 Å in the activation step.
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44

Liu, Xingmei, Yuwei Wang, Liquan Fan, Weichao Zhang, Weiyan Cao, Xianxin Han, Xijun Liu y Hongge Jia. "Sm0.5Sr0.5Co1−xNixO3−δ—A Novel Bifunctional Electrocatalyst for Oxygen Reduction/Evolution Reactions". Molecules 27, n.º 4 (14 de febrero de 2022): 1263. http://dx.doi.org/10.3390/molecules27041263.

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The development of non-precious metal catalysts with excellent bifunctional activities is significant for air–metal batteries. ABO3-type perovskite oxides can improve their catalytic activity and electronic conductivity by doping transition metal elements at B sites. Here, we develop a novel Sm0.5Sr0.5Co1−xNixO3−δ (SSCN) nanofiber-structured electrocatalyst. In 0.1 M KOH electrolyte solution, Sm0.5Sr0.5Co0.8Ni0.2O3−δ (SSCN82) with the optimal Co: Ni molar ratio exhibits good electrocatalytic activity for OER/ORR, affording a low onset potential of 1.39 V, a slight Tafel slope of 123.8 mV dec−1, and a current density of 6.01 mA cm−2 at 1.8 V, and the ORR reaction process was four-electron reaction pathway. Combining the morphological characteristic of SSCN nanofibers with the synergistic effect of cobalt and nickel with a suitable molar ratio is beneficial to improving the catalytic activity of SSCN perovskite oxides. SSCN82 exhibits good bi-functional catalytic performance and electrochemical double-layer capacitance.
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45

Wu, Donghai, Bingling He, Yuanyuan Wang, Peng Lv, Dongwei Ma y Yu Jia. "Double-atom catalysts for energy-related electrocatalysis applications: a theoretical perspective". Journal of Physics D: Applied Physics 55, n.º 20 (31 de enero de 2022): 203001. http://dx.doi.org/10.1088/1361-6463/ac4b56.

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Abstract Due to the excellent activity, selectivity, and stability, atomically dispersed metal catalysts with well-defined structures have attracted intensive research attention. As the extension of single-atom catalyst, double-atom catalyst (DAC) featuring with the metal dimer anchored on a suitable substrate has recently emerged as a research focus for the energy-related electrocatalysis reactions. Due to the flexible dual-metal sites and the synergetic effect between the two metal atoms in DACs, there are more possibilities to adjust their geometrical configurations and electronic structures. The wide tunability of the active sites could offer more opportunities to optimize the binding strength of the reaction intermediates and thus the catalytic activity and/or selectivity of chemical reactions. Moreover, the neighboring metal sites provide a platform to perform more complex electrocatalysis reaction involving the chemical bond coupling. This review aims to summarize the recent advance in theoretical research on DACs for diverse energy-related electrocatalytic reactions. It starts with a brief introduction to DACs. Then an overview of the main experimental synthesis strategies of DACs is provided. Emphatically, the catalytic performance together with the underlying mechanism of the different electrocatalytic reactions, including nitrogen reduction reaction, carbon dioxide reduction reaction, oxygen reduction reaction, and oxygen and hydrogen evolution reactions, are highlighted by discussing how the outstanding attributes mentioned above affect the reaction pathway, catalytic activity, and product selectivity. Finally, the opportunities and challenges for the development of DACs are prospected to shed fresh light on the rational design of more efficient catalysts at the atomic scale in the future.
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46

Kim, Jun Hyuk, Seonyoung Yoo, Ryan Murphy, Yu Chen, Yong Ding, Kai Pei, Bote Zhao, Guntae Kim, YongMan Choi y Meilin Liu. "Promotion of oxygen reduction reaction on a double perovskite electrode by a water-induced surface modification". Energy & Environmental Science 14, n.º 3 (2021): 1506–16. http://dx.doi.org/10.1039/d0ee03283b.

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Water-mediated surface self-assembly on PrBa0.8Ca0.2Co2O5+δ (PBCC) results in formation of BaCoO3−δ (BCO) nanoparticles to boost catalytic activity of oxygen reduction, as confirmed by in situ Raman spectroscopy at high temperatures (HT).
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47

Eftedal, OS, S. Lydersen, G. Helde, L. White, AO Brubakk y LJ Stovner. "A Randomized, Double Blind Study of the Prophylactic Effect of Hyperbaric Oxygen Therapy on Migraine". Cephalalgia 24, n.º 8 (agosto de 2004): 639–44. http://dx.doi.org/10.1111/j.1468-2982.2004.00724.x.

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In a double blind, placebo-controlled study to assess the prophylactic effect of hyperbaric oxygen therapy on migraine, 40 patients were randomly assigned to a treatment group receiving three sessions of hyperbaric oxygen, or a control group receiving three hyperbaric air treatments. The patients were instructed to keep a standardized migraine diary for eight weeks before and after the treatment. Thirty-four patients completed the study. Our primary measure of efficacy was the difference between pre- and post-treatment hours of headache per week. The results show a nonsignificant reduction in hours of headache for the hyperbaric oxygen group compared to the control group. Levels of endothelin-1 in venous blood before and after treatment did not reveal any difference between the hyperbaric oxygen and control groups. We conclude that the tested protocol does not show a significant prophylactic effect on migraine and does not influence the level of endothelin-1 in venous blood.
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48

Wang, Jing, Heng Kong, Haihong Zhong, Yu Jiang, Fei Guo, Nicolas Alonso-Vante y Yongjun Feng. "Recent Progress on Transition Metal Based Layered Double Hydroxides Tailored for Oxygen Electrode Reactions". Catalysts 11, n.º 11 (18 de noviembre de 2021): 1394. http://dx.doi.org/10.3390/catal11111394.

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The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), namely, so-called oxygen electrode reactions, are two fundamental half-cell reactions in the energy storage and conversion devices, e.g., zinc–air batteries and fuel cells. However, the oxygen electrode reactions suffer from sluggish kinetics, large overpotential and complicated reaction paths, and thus require efficient and stable electrocatalysts. Transition-metal-based layered double hydroxides (LDHs) and their derivatives have displayed excellent catalytic performance, suggesting a major contribution to accelerate electrochemical reactions. The rational regulation of electronic structure, defects, and coordination environment of active sites via various functionalized strategies, including tuning the chemical composition, structural architecture, and topotactic transformation process of LDHs precursors, has a great influence on the resulting electrocatalytic behavior. In addition, an in-depth understanding of the structural performance and chemical-composition-performance relationships of LDHs-based electrocatalysts can promote further rational design and optimization of high-performance electrocatalysts. Finally, prospects for the design of efficient and stable LDHs-based materials, for mass-production and large-scale application in practice, are discussed.
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49

Zhang, Wenwen, Ximeng Zhao, Weixing Niu, Hang Yu, Tongtao Wan, Guihua Liu, Dongsheng Zhang y Yanji Wang. "ZIF-67-derived N-doped double layer carbon cage as efficient catalyst for oxygen reduction reaction". Nanotechnology 33, n.º 6 (19 de noviembre de 2021): 065409. http://dx.doi.org/10.1088/1361-6528/ac3541.

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Abstract The slow kinetic of oxygen reduction reaction (ORR) hampers the practical application of energy conversion devices, such as fuel cells, metal-air batteries. Here, an efficient ORR electrocatalyst consists of Co, Ni co-decorated nitrogen-doped double shell hollow carbon cage (Ni–Co@NHC) was fabricated by pyrolyzing Ni-doped polydopamine wrapped ZIF-67. During the preparation, polydopamine served as a protective layer can effectively prevent the aggregation of Co and Ni nanoparticles during the pyrolysis process, and at the same time forming a carbon layer to grow a double layer carbon cage. This unique hollow structure endows the catalyst with a high specific surface area as well as more exposed active sites. Also benefited from the synergistic effect between Ni and Co nanoparticles, the Ni–Co@NHC catalyst leads to an outstanding ORR performance of half-wave potential (E 1/2, 0.862 V), outperforms that of commercial Pt/C catalyst. Additionally, when Ni–Co@NHC was used in the cathode for the zinc-air battery, the cell exhibits high power density (108 mW cm−2) and high specific capacity (806 mAh g−1) at 20 mA cm−2 outperforming Pt/C. This work offers a promising design strategy for the development of high-performance ORR electrocatalysts.
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50

Yan, Yan, Haoyan Cheng, Zehua Qu, Rui Yu, Fan Liu, Qianwen Ma, Shuang Zhao et al. "Recent progress on the synthesis and oxygen reduction applications of Fe-based single-atom and double-atom catalysts". Journal of Materials Chemistry A 9, n.º 35 (2021): 19489–507. http://dx.doi.org/10.1039/d1ta02769g.

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