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	Effect of Operating Condition on Cathodic EIS Parameters in a DMFC
	Jin Bao-Duo ; Guo Jian-Wei ; Xie Xiao-Feng ; Wang Shu-Bo ; Wang Jin-Hai
	2010-05-10 ; 2010-05-10
关键词	Direct methanol fuel cell(DMFC) Low loading catalyst Electrochemical impedance spectroscopy (EIS) Polarization Oxygen reduction reaction (ORR) METHANOL FUEL-CELL AC-IMPEDANCE BEHAVIOR MEMBRANE Chemistry, Multidisciplinary
中文摘要	Optimization of direct methanol fuel cell(DMFC) temperature and flow rate can effectively prevent cathode "flooding", reduce the adverse effects of methanol crossover on cathode reaction, therefore, it is critical to improve the performance of DMFC. In this paper, we reduced the cathode catalyst loading to strengthen electrochemical polarization of DMFC cathode oxygen reduction reaction, and measured polarization curves and electrochemical impedance under different operating conditions. Moreover, an improved equivalent circuit model LR(CR) (QR(LR)) is built to fit the measured spectrum to analyze the effect of operating parameters Such as temperature, air flow rate, methanol flow rate on the cathode electrochemical reaction and mass transfer polarization process of DMFC under the full cell conditions. The results show that: increasing temperature will lead to more methanol to permeate to the cathode, and increase the charge transfer resistance of cathodic oxygen reduction reaction; and only using the high air flow can effectively prevent cathode flooding, and improve oxygen mass transfer to the catalyst; appropriately increasing the flow of methanol can promote the electrochemical reaction of DMFC, but the excessive flow of methanol may lower electrode surface temperature, increase penetration of methanol, therefore adversely affect oxygen reduction reaction.
语种	中文 ; 中文
出版者	HIGHER EDUCATION PRESS ; BEIJING ; SHATANHOU ST 55, BEIJING 100009, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/23187]
专题	清华大学
推荐引用方式 GB/T 7714	Jin Bao-Duo,Guo Jian-Wei,Xie Xiao-Feng,et al. Effect of Operating Condition on Cathodic EIS Parameters in a DMFC[J],2010, 2010.
APA	Jin Bao-Duo,Guo Jian-Wei,Xie Xiao-Feng,Wang Shu-Bo,&Wang Jin-Hai.(2010).Effect of Operating Condition on Cathodic EIS Parameters in a DMFC..
MLA	Jin Bao-Duo,et al."Effect of Operating Condition on Cathodic EIS Parameters in a DMFC".(2010).

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