【作者】 石伟玉； 衣宝廉； 侯明； 景粉宁； 明平文；

【Author】 SHI Wei-yu, YI Bao-lian, HOU Ming JING Fen-ning, MING Ping-wen (Fuel Cell R&D Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences,Dalian 116023,China; Graduate University of the Chinese Academy of Sciences, Beijing 100039, China)

【机构】 中国科学院大连化学物理研究所燃料电池工程中心；

【摘要】 研究了燃料气(H2)中的H2S对质子交换膜燃料电池(PEMFC)性能的影响,结果表明H2S对电池性能的影响取决于燃料气中H2S的浓度、电池操作温度和电流密度,且这种影响是随时间累积的,最终都会造成电池性能的大幅衰减。使用纯净氢气并不能恢复中毒电池的性能,但通过多次循环伏安(CV)扫描可以完全恢复。同时,根据CV研究认为H2S会强烈吸附在Pt催化荆表面,随着扫描电位的升高,吸附物被氧化可能生成SO3或SO42-。通过电化学阻抗(EIS)的方法得到了H2+50 ppm H2S／H2半电池体系下的阻抗谱,结果表明由于H2S吸附造成H2的吸附困难,从而导致在三相界面上的电化学反应所涉及的电荷转移阻抗增加。更多还原

【Abstract】 A study of H2S in fuel steam poisoning of membrane electrode assemblies (MEAs) with Pt catalyst in proton exchange membrane fuel cells (PEMFC) is presented. The severity of H2S poisoning varies depending on the concentration, current density and cell operating temperature, but considerable cell performance deterioration is inevitable because the poisoning effect due to H2S is cumulative. No recovery is observed after exposure to neat H2, however, complete recovery of the cell performance is obtained by several cyclic voltammetry scans between 0-1.4 V vs DHE. Effect of H2S on the anode is studied in an H2/H2 half cell with electrochemical impedance spectroscopy, and the experimental results indicate charge-transfer resistance increase due to H2S poisoning.更多还原