Relevant bibliographies by topics / Cobalt sulfide-graphene composites

Academic literature on the topic 'Cobalt sulfide-graphene composites'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Cobalt sulfide-graphene composites"

1

Ramachandran, R., Grace A. Nirmala, and Chittur K. Subramaniam. "Cobalt Sulfide-Graphene (CoSG) Composite based Electrochemical Double Layer Capacitors." MRS Proceedings 1786 (2015): 19–30. http://dx.doi.org/10.1557/opl.2015.784.

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ABSTRACTElectrochemical Double Layer Capacitors, EDLC, using Cobalt sulfide- Graphene (CoSG) composite electrodes, were fabricated and the storage process was studied. CoSG composite was prepared by a simple chemical route. X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA) and Field Emission Scanning Electron microscopy (FESEM) were used to characterized the as prepared composites which indicated formation of Co S phase. Solutions of perfluorosulfonic acid and Polyvinylidene Fluoride (PVDF) were used as electrode binding material. The storage capacitance of the composites were studied in 1M KCl and 6M KOH electrolytes using standard electrochemical techniques like cyclic voltammetry, CV, electrochemical impedance spectroscopy, EIS, and discharge profiles. The capacitance was estimated for various binder concentrations for both the electrolytes. The concentration of perflurosulfonic acid binder of 0.8 wt% and PVDF of 0.04 wt% showed optimized specific capacitances of 657.8 F/gm and 1418.8 F/g, respectively. Some of the problems in storage density in activated carbon, like varying micro or meso pores, poor ion mobility due to varying pore distribution, low electrical conductivity, can be overcome by using Graphene and composites of Graphene. Graphene in various structural nomenclatures have been used by different groups for charge storage. Optimization of the electrode structure in terms of blend percentage, binder content and interface character in the frequency and time domain provides insights to the double layer interface structure.
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Dai, Kai, Dongpei Li, Luhua Lu, Qi Liu, Jiali Lv, and Guangping Zhu. "Facile synthesis of a reduced graphene oxide/cobalt sulfide hybrid and its electrochemical capacitance performance." RSC Adv. 4, no. 55 (2014): 29216–22. http://dx.doi.org/10.1039/c4ra04103h.

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Reduced graphene oxide (RGO) in situ composites with cobalt sulfide (CoS) are achieved through a facile hydrothermal approach, and RGO/CoS presents a high specific capacitance of 1130 F g−1.
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Thanh Tam, Le Thi, Doan Thanh Tung, Ha Minh Nguyet, Nguyen Thi Ngoc Linh, Ngo Thanh Dung, Nguyen Van Quynh, Nguyen Van Dang, et al. "High electrochemical performance of ink solution based on manganese cobalt sulfide/reduced graphene oxide nano-composites for supercapacitor electrode materials." RSC Advances 12, no. 31 (2022): 20182–90. http://dx.doi.org/10.1039/d2ra02818b.

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Large scale supercapacitor electrodes were prepared by 3D-printing directly on a graphite paper substrate from ink solution containing manganese cobalt sulfide/reduced graphene oxide (MCS/rGO) nanocomposites.
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Zhao, Shi Huai, Wen Wen Xu, Xiao Ming Zhao, and Zi Bo Yang. "Preparation and Capacitance Properties of Nickel-Cobalt Sulfide/Graphene Composites." Materials Science Forum 956 (June 2019): 35–45. http://dx.doi.org/10.4028/www.scientific.net/msf.956.35.

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In order to explore the supercapacitor electrode material with high energy density, a composite material that nickel-cobalt sulfide loaded in graphene (NiCo2S4@rGO) with core-shell structure was successfully prepared by hydrothermal, room temperature vulcanization and annealing. The core-shell structure of the material greatly increased the contact area between the material and the electrolyte and improved the electrochemical performance. In addition, the energy density has been significantly improved. NiCo2S4@rGO was characterized by field emission scanning electron microscopy (SEM), high-resolution transmission electron microscope (HRTEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Raman spectrometer. The electrochemical properties of the material were evaluated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). The results show that the capacitance can reach 1100 F/g at the current density of 0.5 A/g. Furthermore, the NiCo2S4@rGO as positive electrode and reduced graphene oxide (rGO) as negative electrode were assembled into an asymmetric supercapacitor (ASC). The device exhibits a high energy density of 74.78 Wh/Kg at a power density of 400 W/Kg, as well as excellent cycling stability of 88.9% after 3 000 cycles, which reflects the excellent electrochemical performance of the material.
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Tiwari, Santosh K., Anukul K. Thakur, Amrita De Adhikari, Yanqiu Zhu, and Nannan Wang. "Current Research of Graphene-Based Nanocomposites and Their Application for Supercapacitors." Nanomaterials 10, no. 10 (October 16, 2020): 2046. http://dx.doi.org/10.3390/nano10102046.

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This review acmes the latest developments of composites of metal oxides/sulfide comprising of graphene and its analogues as electrode materials in the construction of the next generation of supercapacitors (SCs). SCs have become an indispensable device of energy-storage modes. A prompt increase in the number of scientific accomplishments in this field, including publications, patents, and device fabrication, has evidenced the immense attention they have attracted from scientific communities. These efforts have resulted in rapid advancements in the field of SCs, focusing on the development of electrode materials with features of high performance, economic viability, and robustness. It has been demonstrated that carbon-based electrode materials mixed with metal oxides and sulfoxides can perform extremely well in terms of energy density, durability, and exceptional cyclic stability. Herein, the state-of-the-art technologies relevant to the fabrication, characterization, and property assessment of graphene-based SCs are discussed in detail, especially for the composite forms when mixing with metal sulfide, metal oxides, metal foams, and nanohybrids. Effective synthetic methodologies for the nanocomposite fabrications via intercalation, coating, wrapping, and covalent interactions will be reviewed. We will first introduce some fundamental aspects of SCs, and briefly highlight the impact of graphene-based nanostructures on the basic principle of SCs, and then the recent progress in graphene-based electrodes, electrolytes, and all-solid-state SCs will be covered. The important surface properties of the metal oxides/sulfides electrode materials (nickel oxide, nickel sulfide, molybdenum oxide, ruthenium oxides, stannous oxide, nickel-cobalt sulfide manganese oxides, multiferroic materials like BaMnF, core-shell materials, etc.) will be described in each section as per requirement. Finally, we will show that composites of graphene-based electrodes are promising for the construction of the next generation of high performance, robust SCs that hold the prospects for practical applications.
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Wang, Yang, Jing Tang, Biao Kong, Dingsi Jia, Yuhang Wang, Tiance An, Lijuan Zhang, and Gengfeng Zheng. "Freestanding 3D graphene/cobalt sulfide composites for supercapacitors and hydrogen evolution reaction." RSC Advances 5, no. 9 (2015): 6886–91. http://dx.doi.org/10.1039/c4ra15912h.

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Hazarika, Ankita, Biplab K. Deka, DoYoung Kim, Hyung Doh Roh, Young-Bin Park, and Hyung Wook Park. "Fabrication and Synthesis of Highly Ordered Nickel Cobalt Sulfide Nanowire-Grown Woven Kevlar Fiber/Reduced Graphene Oxide/Polyester Composites." ACS Applied Materials & Interfaces 9, no. 41 (October 6, 2017): 36311–19. http://dx.doi.org/10.1021/acsami.7b11712.

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Wang, Nan, Ligui Li, Dengke Zhao, Xiongwu Kang, Zhenghua Tang, and Shaowei Chen. "Graphene Composites with Cobalt Sulfide: Efficient Trifunctional Electrocatalysts for Oxygen Reversible Catalysis and Hydrogen Production in the Same Electrolyte." Small 13, no. 33 (July 10, 2017): 1701025. http://dx.doi.org/10.1002/smll.201701025.

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Huang, Jing, Xuekun Tang, Zishun Li, and Kun Liu. "Metal organic frameworks derived cobalt sulfide/reduced graphene oxide composites with fast reaction kinetic and excellent structural stability for sodium storage." Journal of Colloid and Interface Science 532 (December 2018): 407–15. http://dx.doi.org/10.1016/j.jcis.2018.08.002.

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Yu, Kaifeng, Jinyang Wang, Xiaofeng Wang, Yi Li, and Ce Liang. "Zinc–cobalt bimetallic sulfide anchored on the surface of reduced graphene oxide used as anode for lithium ion battery." Journal of Solid State Chemistry 290 (October 2020): 121619. http://dx.doi.org/10.1016/j.jssc.2020.121619.

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Dissertations / Theses on the topic "Cobalt sulfide-graphene composites"

1

Bi, Qi. "Development of High-performance Cathodic Catalysts for Non-Aqueous Lithium-Oxygen Batteries." Thesis, 2020. http://hdl.handle.net/2440/125043.

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Lithium-oxygen (Li-O2) batteries have attracted intensive attention in last decade, due to its high theoretical energy densities and environmental benignity that satisfy the need for large energy storage systems including electric vehicles. However, they are still in their infancy and several challenges remain to be addressed immediately. In addition to the degradation of anode and electrolyte, one of the biggest challenges is the structure and catalytic design for oxygen electrode to achieve high capacity and long cycle life. In this thesis, size-controlled polystyrene (PS) spheres were introduced to a polydopamine derived N-doped reduced graphene (N-rGO) to explore the impact of the pore size of carbon oxygen electrodes to the performance of Li-O2 batteries. The battery containing N-rGO with 170 nm pores revealed a high specific capacity of 16777 mA h g-1, which is one of the highest among the reported carbon-based Li-O2 batteries. Field emission scanning electron microscope (FESEM) of cathode morphologies before and after discharge/charge showed that the N-rGO with 170 nm pores could hold most discharge products at a cut-off capacity of 1000 mA h g-1 without deformation to achieve a long stable cycle life. Furthermore, cobalt sulfides with controlled phases being synthesized via thermal decomposition of Co(TU)4(NO3)2 were studied as the bi-functional catalysts towards both ORR and OER of Li-O2 batteries in order to improve specific capacity and cycling life. A dual-phase cobalt sulfide prepared at 900 °C (CoS-900) contains both Co9S8 and CoS exhibited excellent ORR and OER catalytic activities with a low overvoltage (1.25 V) for Li-O2 batteries. The designated CoS-900@NG cathode achieved large discharge capacity at 7410 mA h g-1 with 100% charge capacity recovery as well as a super long cycle life at 108 cycles for Li-O2 battery. The excellent Li-O2 batteries performance can be attributed to the generation of both crystalline and amorphous film-like Li2O2 that effectively improve ORR/OER kinetics of Li-O2 batteries. Finally, Co9S8 nanoparticles were anchored to N, S co-doped graphene to form leave-like Co9S8/N, S-GO composites through hydrothermal treatment. The composite was further optimized by adjusting cobalt sulfide precursor amount to achieve an improvement of battery performance. As a result, the Li-O2 battery with Co9S8/N, S-GO composite can achieve a 100% recoverable high discharge capacity at 4884 mA h g-1 and a stable cycle life. The thesis systematically explored the relationship between the structures of oxygen electrode and electrochemical performance of Li-O2 batteries, including surface structure, heteroatom doping and cobalt sulphide hybridization. The outcomes provide new perspectives for the future development of high-performance Li-O2 batteries by strategically designing ORR/OER catalysts.
Thesis (Ph.D.) -- University of Adelaide, School of Chemical Engineering & Advanced Materials, 2020
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HUANG, CHING-YI, and 黃靖詒. "Nitrogen-Doping Carbon Nanotubes/Graphene Composites Modified by Manganese-Cobalt Sulfide via CV Electrodeposition Route as Electrode Materials of Supercapacitors." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/n94fay.

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碩士
國立雲林科技大學
化學工程與材料工程系
106
In recent year, with the fast development in 3C industrial, the demand with high efficiency, high reliability and good cycling stability also increases. Supercapacitor is a high efficiency energy storage device, the performance is between traditional capacitor and chemical capacitor. Electrode material and electrolyte are the factor influencing performance. Electrode materials mainly include carbon materials, metal oxides and conductive polymer material. Carbon material is widely used due to electrochemical stability and low prices. In this research, chemical vapor deposition (CVD) will be used to prepared graphene/carbon nanotubes composite materials, and add nitrogen functional groups to the surface of graphene/carbon nanotubes composite materials, it was treated by radio frequency (RF) nitrogen-plasma. Next, manganese-cobalt sulfide electrodes are manufactured by cyclic voltammetry deposition process. Different deposition rate and deposition cycle, then deposited onto graphene/carbon nanotubes composites materials. Besides, Raman, SEM, XPS, AFM, EDS were conducted to analyze the electrochemical characteristics of electrode. Meanwhile, it’s being discussed about the influences on the capacitance characteristics by combination of N-doped and manganese-cobalt sulfide deposited onto graphene/carbon nanotubes substrate.
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