Tesis sobre el tema "Bipolar PWM"
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PEROTTI, MICHELE. "Software Solutions to Mitigate the Electromagnetic Emissions of Power Inverters". Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2842505.
Texto completoAzimifar, Seyed Ali. "Corrosion of bipolar plates in PEM fuel cells". Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6285/.
Texto completoLædre, Sigrid. "Investigation of metallic bipolar plates for PEM fuel cells". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16307.
Texto completoPiri, Hossein. "Flow visualization in 3D printed PEM fuel cell bipolar plates". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62259.
Texto completoApplied Science, Faculty of
Chemical and Biological Engineering, Department of
Graduate
Kruszewski, Eric. "Investigation of Graphite Bipolar Plates for PEM Fuel Cell Performance". Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/35835.
Texto completoMaster of Science
Husby, Håvard. "Carbon Based Coatings for Metallic Bipolar Plates in PEM Fuel Cells". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for kjemisk prosessteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22407.
Texto completoHamilton, Philip John. "The development of PVD coatings for PEM fuel cell bipolar plates". Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5107/.
Texto completoMølmen, Live. "Materials Reliability in PEM Fuel Cells". Licentiate thesis, Jönköping University, JTH, Material och tillverkning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-52424.
Texto completoSom en del av det globala arbetet med at reducera utsläppen av koldioxid måste alla fordon elektrifieras eller tankas med förnybart bränsle. Batterier har redan revolutionerat bilmarknaden, men bränsleceller är en viktig pusselbit för att också elektrifiera tunga fordon. Den typen av bränsleceller för fordon som finns tillgänglig på den kommersiella marknaden i dag är polymerelektrolytbränslecellen (PEMFC). För att PEMFC skall ta en större marknadsandel måste kostnaderna minskas och livslängden förlängas. PEMFC består av ett antal komponenter gjorda av olika material, bland annat polymer membran, ädelmetallkatalysator, och metalliska bipolära plattor. Kombinationen av olika material i tillägg till den höga temperaturen, hög fuktighet och låg pH gör att materialen i bränslecellen är utsatta för korrosion. Ädelmetallkatalysatorn är en av de kostdrivande komponenterna i bränslecellen. I denna studien presenteras en översikt över framstegen inom katalysatormaterial för PEM bränsleceller de senaste två åren. Sedan studeras elektroplätering som en enkel produktionsmetod för nanopartiklar av platina legeringar. Möjligheten att simultant plätera fler metaller, och att använda gasdiffutions-skiktet från bränslecellen som substrat för att reducera antal produktionsteg och därmed reducera kostnader, undersöks. Det möjliggör också snabb testning av olika legeringar för att identifiera den optimala sammansättningen med hög prestanda, lång livslängd och lite platina. I tillägg till att ta fram billigare och tåliga material är det viktigt att förstå hur materialen degraderar och hur degraderingen av ett material påverkar de andra komponenterna. Med den kunskapen kan man utveckla accelererade testmetoder för att bedöma livslängden av hela bränslecellen. Validerade testmetoder är viktigt för att styrka förtroendet till nya teknologier. I denna studien fokuseras det också på korrosion av bipolära plattor, och hur olika lastcykler och fuktnivåer som kan bli applicerad vid accelererad testning påverkar korrosionen. Också effekten av defekter från tillverkningen i den skyddande beläggningen analyseras med hänsyn till korrosion, för att ge mer insikt i hur bipolära plattor kan designas och produceras för att minska korrosionen.
Cunningham, Brent David. "The Development of Compression Moldable Polymer Composite Bipolar Plates for Fuel Cells". Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/26197.
Texto completoPh. D.
Desrosiers, Kevin Campbell. "Evaluation of Novel and Low-Cost Materials for Bipolar Plates in PEM Fuel Cells". Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/35197.
Texto completoMaster of Science
REINPOLD, LASSE MATTHIAS. "Analysis of Heating Processes for the Production of Bipolar Plates in PEM Fuel Cells". Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289622.
Texto completoPolymerelektrolytmembranbränsleceller (PEMFC) är ett lovande alternativ till förbränningsmotorer och batterier i fordon. Fordon som drivs av PEMFC har en längre räckvidd än batteridrivna bilar och behöver bara några minuter för att tanka. PEMFC kan drivas utan utsläpp av växthusgaser. För att få betydande marknadsandelar måste tillverkningskostnaderna för dessa bränsleceller minskas. Detta kan uppnås genom att förbättra produktionsprocessen. Dessutom kan en förbättrad prestanda för bränslecellen leda till en minskning av storlek, materialanvändning och därmed produktionskostnader. Denna uppsats undersöker stämpling av metalliska bipolära plattor, som har en betydande del av kostnaden för en PEMFC. I konventionella produktionsmetoder bildas flödesfältgeometrin vid omgivningstemperaturer vilket begränsar den grad av deformation som kan uppnås innan materialets strukturella gränser överskrids. Det förväntas att stämpling vid förhöjd temperatur ökar formningsgränsen för materialet och därför flexibiliteten vid formning av kanalgeometrin. Detta förväntas förenkla tillverkningsprocessen och förbättra bränslecellens resultat. Målet med denna avhandling är att testa denna hypotes och fastställa hur förhöjda temperaturer underlättar högre deformationsgrader. För att uppnå detta används olika uppvärmningsmetoder som riktmärken och analyseras numeriskt för att identifiera den lämpligaste metoden för experiment med hetstämpling. Av sex undersökta värmekoncept identifieras direkt resistiv uppvärmning som den mest lämpliga. Konceptets lämplighet stöds av numeriska simuleringar. Det direktresistiva uppvärmningssystemet är utformat och integrerat i den befintliga experimentella installationen. Fyra olika kanalgeometrier undersöks. Prover bildas vid 150 ° C, 300 ° C, 600 ° C och 900 ° C. Hexagonal bornitrid används som smörjmedel. Stämplingsexperimenten utförda vid förhöjda temperaturer indikerar att de bipolära plattornas formbarhet förbättras jämfört med de kallformade referensexperimenten. De bästa resultaten erhålls vid 900 ° C där det genomsnittliga kanaldjupet, som kan bildas innan sprickor observeras i proverna, skulle kunna förbättras med 27% jämfört med formningen vid rumstemperatur.
Duddukuri, Ramesh. "SYNTHESIZING AND CHARACTERIZATION OF TITANIUM DIBORIDE FOR COMPOSITE BIPOLAR PLATES IN PEM FUEL CELL". OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/862.
Texto completoDu, Ling. "Highly Conductive Epoxy/Graphite Polymer Composite Bipolar Plates in Proton Exchange Membrane (PEM) Fuel Cells". University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1202345378.
Texto completoSoueidan, Ahmed Yassin. "A NEW PEMFC FLOW FIELD PLATE OPTIMIZATION COMPARISON - ANSYS FLUENT FUEL-CELL SIMULATION". OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/908.
Texto completoGreenwood, Paul S. "Polymeric bipolar plates for PEM fuel cells : experimental and modeling approach to assess factors influencing performance". Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/7249.
Texto completoJendras, Philipp, Karl Lötsch y Unwerth Thomas von. "Strömungssimulation zur Optimierung von Flussfeldern in PEM-Brennstoffzellen". Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-226005.
Texto completoCai, Jiaying y D. F. Gervasio. "The Nature of Surface Oxides on Corrosion-Resistant Nickel Alloy Covered by Alkaline Water". SpringerOpen, 2010. http://hdl.handle.net/10150/610223.
Texto completoTuran, Cabir. "Investigations on the Effect of Manufacturing on the Contact Resistance Behavior of Metallic Bipolar Plates for Polymer Electrolyte Membrane Fuel Cells". VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/2629.
Texto completoZabihi, Sasan. "Flexible high voltage pulsed power supply for plasma applications". Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/48137/1/Sasan_Zabihi_Sheykhrajeh_Thesis.pdf.
Texto completoHedayati, Mohammad Hassan. "Integrated CM Filter for Single-Phase and Three-Phase PWM Rectifiers". Thesis, 2015. http://etd.iisc.ernet.in/2005/3947.
Texto completoWeng, Wei Hong y 翁維宏. "Design of metallic bipolar plate for PEM fuel cell". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/rmfq2f.
Texto completo國立臺南大學
綠色能源科技學系碩士班
102
Bipolar plate, one of main components of proton exchange membrane fuel cells (PEMFC), can provide multiple functions, such as reaction gas separation, current collection, and thermal heat conduction. Typically (in general), bipolar plate accounts for 20% of the product cost of a fuel cell stack and it accounts for 60%-80% of the weight of a fuel cell stack. It is a major challenge in commercialization of fuel cells to reduce the cost and weight of bipolar plates. This dissertation presents a mechanical design method for stamped metal bipolar plates, which consists of a gas channel, a supply header, an exhaust header and seals. Based on the combination of cathode-plates and anode-plates inside a bipolar plates assembly, an independent flow field is generated between these two plates and allows coolant to distribute and flow readily within coolant volume.This study collects and analyzes several patents owned by automobile manufacturing companies, as well as discussing the process of the flow channel design and the principle of cooling channel production. It proposes four different channel flow models. Each model has a pair of stamped gas channels bonded together to provide coolant volume and helps design the bipolar plate flow field structures by using the model. We use CAD software to build 3D models, simulate the bipolar plate assembly verification, and analyze the coolant flow fields. This study develops three different designs of metal bipolar plates and our results suggests that through the gas flow path arrangement, all of these three designs can effectively create separate coolant flow fields.
Chen, Yen-Chin y 陳彥志. "Development of Bipolar Plate Composite Materials for PEM Fuel Cell". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/56530391131846482388.
Texto completo華梵大學
機電工程研究所
93
The paper was to investigate the development of the graphite/resin composites that were fabricated by hot press for the bipolar plate of the fuel cell. Effect of the different amounts of resin, graphite size, and molding pressure on the porosity, density, bending strength, and electrical resistivity of the composites would be analyzed. In addition, the composites of the bipolar plates would be machined into the groove channel using high speed milling, which then assembles into single fuel cell. The I-V performance of the fuel cell would be also discussed. The experimental results showed that for a larger amount of resin, a less porosity, a larger buck electrical resistivity and a better bending strength of the composites could be obtained. Moreover, the larger graphite size the composites contained, the lower porosity and electrical resistivity of the composites were obtained. Besides, the composites contained a moderate graphite size of 300 mesh could get a better bending strength. In addition, for a larger molding pressure during hot press, a lower porosity, a lower electrical resistivity, and a higher bending strength of the composites could be obtained. The graphite/resin composite containing a higher bending strength and a lower porosity during the high-speed milling can produce a better surface quality of the groove channel. When the faster feed during the milling was employed, the pores on the surface of the groove channel would produce spalling. Finally, the graphite/resin composites of bipolar plates of the fuel cell fabricated could obtain a lighter, easier forming and machining than the graphite bipolar plates, but had a larger electrical resistivity. Finally, the graphite/resin composites of bipolar plates containing 25-30 vol% resins were fabricated into a single fuel cell, which displays a relatively better I-V performance.
Chen, Ssuwei. "Fabrication of PEM fuel cell bipolar plate by indirect selective laser sintering". Thesis, 2006. http://hdl.handle.net/2152/2474.
Texto completoPazmino, Gonzalo Alfonso Almeida y 艾梅達. "Verification of the Durability of Graphite Composite Bipolar Plates in Single PEM Fuel Cells". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/26596732541197874716.
Texto completo元智大學
機械工程學系
99
Bipolar plate is one of the most important components of the fuel cell from the fact that it contributes the majority of the cost and weight of PEM fuel cell. Durability and cost have been the two main challenges for fuel cell technology to be used in the energy market. The term of durability is related to the ability of the PEM fuel cell to resist permanent decrease in performance over time, which is not recoverable and reversible. The bipolar plates make connections all over the surface of one cathode in a cell and the anode of the next cell, serve as a means of feeding oxygen to the cathode and fuel gas to the anode, conduct the electronic current between two cells, separate the gases and contain the flow patterns both for the reactants and for the coolant, facilitate water management within the cell, enable heat transfer, and constitute the backbone of a power stack. The bipolar plate materials require multiple properties to be acceptable, such as high electrical conductivity, low gas permeability, high corrosion resistance, sufficient strength, low thermal resistance, low cost, etc. Graphite composites have attractive characteristics to be used in bipolar plates, such as the combination of high corrosion and chemical resistance, low density, and high electrical and thermal conductivity. However, they have unfavorable disadvantages when compared to metals, their durability under shock and vibration, permeability to hydrogen, and manufacturability, they need an increase in weight and volume to overcome their deficiencies. This research consist in testing the durability of graphite composites bipolar plates in three single PEM fuel cells, and comparing them with commercial graphite bipolar plates in a single PEM fuel cell, under constant current ageing mode and at the same operation conditions in a fuel cell test stand.
Huang, Cheng-Yang y 黃承陽. "Study of preparation and surface modification of aluminum bipolar plate for PEM fuel cell". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/3wje2p.
Texto completo國立虎尾科技大學
材料科學與綠色能源工程研究所
98
In this study, the corrosion behavior of electroless Ni, Au plating and Polypyrrole coatings using cyclic voltammetry were prepared on 1050 aluminum plate is investigated in a simulated polymer electrolyte membrane fuel cell (PEMFC) environment included 0.5 M at room temperature. Potentiodynamic technique and electrochemical impedance spectroscopy (EIS) were performed to determine the corrosion properties of electroless plating and polypyrrole coatings. It was found that corrosion potential of the coated sample at room temperature was shift toward noble potential. Polypyrrole coating with the highest value of corrosion potential in all indicating better corrosion resistance performance, compared to others. In addition, the computer-aided design and manufacturing (CAD / CAM) technology was employed to develop and produce aluminum bipolar plates. Surface modification was carried out on the aluminum plates. The coated and uncoated bipolar plates were assembled to a direct methanol fuel cell (DMFC) and cell performance testing was conducted by Potentiodynamic polarization and constant current methods. Results showed that the prepared aluminum bipolar plate was suitable for fuel cell applications.
Lin, Hsin-Chuan y 林信全. "Study of NiAl Coated Metallic Bipolar Plates of PEM Fuel Cells Using Magnetron Sputtering Depostion". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/79695147742646109274.
Texto completo逢甲大學
材料科學所
93
Abstract Stainless steels are considered to be good candidates for bipolar plate materials of PEM fuel cells due to their low cost, high strength and ease of machining. However, corrosion of the metallic plates is a severe problem and affects the performance and lifetime of fuel cells. The NiAl intermetallic compound provides excellent properties of oxidation resistance , high electrical, thermal conductivities and was selected as protective layer. The NiAl film was deposited on AISI 304 stainless plates by DC magnetron sputtering system. Field emission scanning electron microscope , grazing incident X-ray diffraction, glow discharge spectrometer and potentialstat were used to analyze the NiAl film . From the XRD and GDS data, the sample annealed at 800℃with in situ and post process appears the AlFe0.23Ni0.77 phase as a result of interdiffusion between the NiAl film and the substrate . The FE-SEM photos reveal that the in situ annealing process leads to island-like and rough surface morphology. Moreover, the analysis of the potential dynamics curves divulges that the sample is post annealed at 600℃ under a working pressure of 9 mtorr exhibits an promotional corrosion potential of -69.5 mV.
Πρωιμάδης, Ιωάννης. "Μελέτη και κατασκευή συστήματος οδήγησης σύγχρονου κινητήρα μαγνητικής αντίδρασης (reluctance)". Thesis, 2012. http://hdl.handle.net/10889/6225.
Texto completoThis Thesis is focused on the study and development of a Drive System for the Synchronous Reluctance Motor. This work was conducted in the laboratory of Electromechanical Energy Conversion, at the department of Electrical and Computer Engineering, in the University of Patras, Greece. The main purpose of this project was the study and construction of a three Phase Voltage Source Inverter for the control of the performance of a Synchronous Reluctance Motor by the implementation of Scalar and Vector control. In this thesis, a scalar V/f control scheme was applied, both open and closed loop, for the control of the rotational speed of the rotor. As far as the Synchronous Reluctance Motor is concerned, in the latest years a great interest has emerged around this motor, which mainly focuses in the optimization of its construction and control. The main feature of this motor is that the rotor does not have any field winding. By this way, the output torque is produced only by the so called reluctance torque. In this work, an introduction on the AC motor is done, while the main interest is focused on the already mentioned motors. The analysis of this motor covers many aspects, such as the construction characteristics, the mathematical model of the motor, as well as a comparison with other popular motors. Moreover, the three Phase Inverter is studied, since it is used for the control of the motor. Also, there is an extended reference on the Pulse Width Modulation technique, which is used for the control of power devices. In the next chapters, the simulation of this motor is presented, since it is necessary fot the understanding of its dynamic behavior. In the following, an analysis on the design and construction of the required printed circuit boards is done, while the microcontroller which was used is presented in a more detailed way. The flowacharts of the open and closed loop control methods of the rotational speed are also given. Finally, the experimental results for both cases are presented and analysed.
Cheng, Po-Yi y 鄭博毅. "Acoustic Field Induced by Linear Array Ultrasonic Transducers in Graphite Bipolar Plates for PEM Fuel Cells". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/09504732001384415474.
Texto completo國立交通大學
機械工程學系
98
Water management is an important issue to improve performance of proton-exchange-membrane (PEM) fuel cells. In order to understand the feasibility of monitoring water production in PEM fuel cells using ultrasonic visualization, this thesis numerically studies linear array induced ultrasound propagation in graphite bipolar plates with machined flow channels. The material properties of graphite bipolar flow channels were experimentally characterized. Experimental results indicate that it is nearly an isotropic material. Comparing the ultrasonic signals acquired in different states and areas of graphite bipolar plates, the reflected echoes have significant changes when water appears in flow channels. According to the B-scan signals of graphite bipolar plates using immersion focusing ultrasonic transducer, the distribution of water can be clearly determined. Based on the investigation of the acoustic field induced by single element piezoelectric transducer attached on surface of semi-infinite solids, a linear array ultrasonic transducer was further designed. Both graphite composite and pure graphite are considered as acoustic media under investigation. Single element generated ultrasound in pure graphite has narrow main lobe due to its hexagonal anisotropy. The side lobe produced by acoustic phase interference is relatively small. It results that acoustic directivity of sound beam has smaller divergence angle in pure graphite than graphite composite. Transient analysis for acoustic field induced by linear array ultrasonic transducer in graphite bipolar plate indicates that the water distribution in the flow channels can be successfully discriminated.
Wang, Szu-Hua y 王泗華. "The Development and Study of Surface Modified Titanium-based Metallic Bipolar Plates for PEM Fuel Cells". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/62088291024761898596.
Texto completo中興大學
生物產業機電工程學系所
95
The use of metallic bipolar plate on fuel cell application has been highly expected and pay attention. However, the results of the relative researches were not affirming the achievements. The main reason is the corrosion of the bipolar plates due to the acid aqueous solution produced during the fuel cell operation or the decrease of cell performance due to the formation of metallic ions. In this study, we choose the Titanium (Ti) as the base material for the bipolar plates. By applying the electroplating and sintering methods of the Dimensionally Stable Anode, DSA. The surface of the Titanium bipolar plates were modified by coating with 2.5µm platinum (Pt) layer or sintering 20 g/m2 iridium oxide (IrO2) layer. Platinum (Pt) and Iridium oxide (IrO2) are not only corrosive resistance, but also consist anti-oxidant and perfect electrochemical properties, which are very suitable for being the materials as surface modification of metallic bipolar plates. The results indicated that the optimum operation conditions for the metallic bipolar plates and graphite bipolar plates were totally different. For the metallic bipolar plates, the hydrogen and oxygen fuel must be fully humidified, while the current density and power density of the fuel cell were better under a lower operation temperature. For the graphite bipolar plates, the hydrogen and oxygen fuel only need proper humidified, while the current density and power density of the fuel cell were better under a higher operation temperature. The long term durability testing for different types of bipolar plates were being performed, the results indicated that the main flow field channel of the Titanium bipolar plates single fuel cell had oxidation phenomenon, where the Cathode end was the most serious. Whereas, the electroplating layer of the main flow field channel of the Titanium coating with gold (Au) bipolar plates single fuel cell also had serious corrosion phenomenon at the Cathode end. In fact, the corrosion resistance ability of the bipolar plates sintering with iridium oxide (IrO2), coating with platinum (Pt) and graphite were better. The results also indicated that through the surface modification of the bipolar plates, the corrosion problem due to the acid aqueous solution can be improved; the cost can be lowered, and led to the fuel cell become lighter and thinner.
Rocha, Cristóvão Fraga Andrade Pereira da. "Design and development of large-scale flow fields and bipolar plates for pem fuel cells in aircraft applications". Master's thesis, 2021. https://hdl.handle.net/10216/137195.
Texto completoChen, Wei-cheng y 陳威呈. "Studies of the Structure of Carbon Fiber Bunch Unipolar/Bipolar Plates on the Performance of PEM Fuel Cell". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/00387743496056865138.
Texto completo國立中山大學
機械與機電工程學系研究所
98
The effects of the structure of new carbon fiber bunch heterogeneous unipolar plates on the performance of PEMFC are studied in this thesis. Internal structure of carbon fiber bunches can be modified by embedding different thickness or number of copper plates in the glue bonding area to increase the air permeability of carbon fiber bunches in its soft end. We can add different thickness or amount of coppers at the middle of bonding area, making the carbon fiber bunches soft side to form parallel to the longitudinal fiber bunch with a small flow channel. We can also make a trench at the appropriate place of the soft side of the carbon fiber bunches to form an extra air passage. In order to make the above flow channel, a new process for making the carbon fiber bunches is developed also. This process will be easier to produce a variety of different structures of carbon fiber bunch. Finally, several different experiments are performed to help us to understand the effect of the carbon fiber bunch structure on the performance and find out the best structure of the carbon fiber bunches. The carbon fiber bunch structures of the test cells on the anode side are all the same, but the carbon fiber bunch structures of on cathode side are all different. Experiments show that there are two structures among all test structures displayed better gas permeability. The first one is two 0.2 mm copper plates embedded within both sides of the glue ends of a cathode carbon fiber bunch, so that a small longitudinal flow channel are formed in soft end of the cathode carbon fiber bunch. When the HFC operates at room temperature and by air-breathing, the highest performance of the HFC can reach a value of 185 mW/cm2. The second one is a 0.2 mm copper plate embedded in the center of the glue end of a carbon fiber bunch, and then three 2 mm wide serrated slots are cut on the soft end of the carbon fiber bunch. The highest performance of the HFC can reach a value of 190 mW/cm2. The highest performance of the HFC with no copper plate and no slot structure can only reach a value 160 mW/cm2. The second design can increase the no structure cell performance 18.8%. Therefore, the internal structures of carbon fiber bunches are significant to affect on the fuel cell performance, and its internal design must be considered.
Lin, Chang-Hua y 林昶樺. "Study of electroless and electrochemical coatings for the corrosion protection of stainless steel bipolar plates for the PEM fuel cell". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/p4f262.
Texto completo國立虎尾科技大學
光電與材料科技研究所
97
In this study, the corrosion behavior of electroless Ni, Au, Ag plating and Polypyrrole coatings using cyclic voltammetry were prepared on SS 316 stainless steel is investigated in a simulated polymer electrolyte membrane fuel cell (PEMFC) environment included 0.5 M at room temperature and 70℃. The main purposes are to offer fundamental information for the development of metal bipolar plates in PEMFC, and to obtain a deeper understanding of the electrochemical corrosion characteristics for electroless plating systems and the polypyrrole by electrochemical polymerization. Potentiodynamic tests were performed to determine the corrosion properties of electroless plating and polypyrrole coatings. It was found that corrosion potential of the coated sample at room temperature was shift toward noble potential. Polypyrrole coating with the highest value of corrosion potential in all indicating better corrosion resistance performance, compared to others. However, only the corrosion potential of electroless Ag plating and Polypyrrole coatings have the tendency that corrosion potential was shift toward noble potential at 70℃. Electroless Ag plating with the highest value of corrosion potential in all indicating better corrosion resistance performance, compared to others. This study addresses the corrosion resistance characteristics of polypyrrole coating on SS 316 stainless steel for PEMFC bipolar plate applications at room temperature environment. However, electroless Ag plating on SS 316 stainless steel for PEMFC bipolar plate applications at 70℃.