摘要
高温聚合物电解质膜燃料电池(HT-PEMFC)通常以含N_(2)、CO、CO_(2)等非氢组分的重整氢气作为燃料,而非氢组分的存在使得电池性能大幅下降、稳定性变差。通过极化分析、电化学阻抗谱等手段研究了不同组分与浓度的N_(2)、CO对HT-PEMFC性能的影响。结果表明,N_(2)单独存在时的稀释效应增加了物质传输阻抗,而CO单独存在时会毒化电催化剂,增加氢氧化反应(HOR)电荷转移阻抗。在惰性稀释组分和毒化组分共同存在时,膜电极性能损失高于它们单独存在时的加和。该现象源于在较高的H2传质阻力条件下,H_(2)与CO的竞争吸附反应导致的毒化加剧。本研究为HT-PEMFC膜电极的设计优化奠定了基础,并为电堆高效可靠性运行提供指导。
High temperature polymer electrolyte membrane fuel cells(HT-PEMFC)usually use reformed hydrogen containing N_(2),CO,CO_(2) and other non-hydrogen components as fuel.The existence of non-hydrogen components greatly reduces the performance and stability of the HT-PEMFC.The effects of different components and concentrations of N2 and CO on the performance of HT-PEMFC were investigated by means of polarization analysis and electrochemical impedance spectroscopy.The results show that the dilution effect of individual N2 increases the mass transfer impedance,while individual CO poisons the electrocatalyst and increases the charge transfer impedance.When the inert diluent component and the poisoning component coexist,the performance loss of the membrane electrode is higher than the sum of the individual presence.The phenomenon stems from the intensified poisoning caused by the competitive adsorption reaction of H_(2) and CO under high H2 mass transfer resistance.This work lays a foundation for the design optimization of HT-PEMFC membrane electrodes and provides a guidance for the efficient and reliable operation of the stack.
作者
徐欢
夏章讯
景粉宁
王素力
孙公权
XU Huan;XIAZhangxun;JING Fenning;WANG Suli;SUN Gongquan(Division of Fuel Cell&Battery,Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian Liaoning 116023,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Fuel Cell&Hybrid Power Source,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian Liaoning 116023,China)
出处
《电源技术》
CAS
北大核心
2023年第6期687-692,共6页
Chinese Journal of Power Sources
基金
国家自然科学基金面上项目(22179130)
中国科学院重点实验室基金(CXJJ-21S024)。
关键词
高温聚合物电解质膜燃料电池
重整氢气
电化学阻抗谱
物质传输
high temperature polymer electrolyte membrane fuel cell
reformed hydrogen
electrochemical impedance spectroscopy
mass transport
