PtIr双功能催化剂膜电极制备及抗反极性能研究  

Fabrication of bifunctional PtIr catalysts-based membrane electrode assembly and investigation of its reversal tolerant performance

作　　者：黄晓婷 贺阳 孙毅 张晓艳[1] HUANG Xiaoting;HE Yang;SUN Yi;ZHANG Xiaoyan(Department of Chemistry,College of Sciences,Shanghai University,Shanghai 200444,China;Aerospace Hydrogen Energy(Shanghai)Technology Co.,Ltd.,Shanghai 200241,China;State Key Laboratory of Space-Sources Technology,Shanghai Institute of Space Power-Sources,Shanghai 200233,China)

机构地区：[1]上海大学理学院化学系,上海200444 [2]航天氢能(上海)科技有限公司,上海200241 [3]上海空间电源研究所空间电源技术国家重点实验室,上海200233

出　　处：《电源技术》2024年第9期1807-1813,共7页Chinese Journal of Power Sources

基　　金：国家自然科学基金项目(51972318)。

摘　　要：燃料供应不足会导致质子交换膜燃料电池膜电极电压反转,造成阳极催化层中的碳载体发生严重腐蚀,进而给燃料电池带来不可逆的损伤。为了解决该问题,采用双功能PtIr合金作为阳极催化剂制备膜电极,并对其进行了电极极化性能、反极和交流阻抗等测试。结果表明,PtIr/C电极的峰值功率密度可达1.49 W/cm^(2),较Pt/C-IrO_(2)(50%)电极(1.46 W/cm^(2))提高2.1%。反极结果表明,PtIr/C电极抗反极时间725 s,较掺杂IrO_(2)的Pt/C电极反极性能略差,但在整个反极过程中PtIr/C电极呈现出更低的绝对反转电压,以及反极后保持更高的结构稳定性。反极后PtIr/C电极峰值功率密度降为1.18 W/cm^(2),衰减约20.80%,而Pt/C-IrO_(2)(50%)电极的峰值功率密度降至1.09 W/cm^(2),衰减约25.34%。PtIr/C电极相较掺杂IrO_(2)的Pt/C电极具有更佳的初始极化性能和优异的抗反极能力。该研究结果对质子交换膜燃料电池高性能长寿命膜电极催化层设计具有重要的意义。Voltage reversal due to insufficient fuel supply severely restricts the lifespan of proton exchange membrane fuel cells(PEMFCs).In order to study and solve this problem,this work used bifunctional PtIr alloys as anode catalyst to fabricate membrane electrode assembly(MEA)and performed polarization performance,reversal tolerant performance and electrochemical impedance spectroscopy(EIS),etc.The results show that the peak power density of PtIr/C electrode can reach 1.49 W/cm^(2),which is 2.1%higher than that of Pt/C-IrO_(2)(50%)electrode(1.46 W/cm^(2)).The reversal tolerant results show that PtIr/C electrode presents an anti-electrode time of 725 s,which is slightly worse than that of Pt/C-IrO_(2)(50%)electrode,and lower absolute reversal voltage during the whole process,as well as higher structural stability which remained unchanged after reversal test.After the reversal,the peak power density of the PtIr/C electrode decreases to 1.18 W/cm^(2) with an attenuation of about 20.80%,while the peak power density of the Pt/C-IrO_(2)(50%)electrode decreases to 1.09 W/cm^(2) with an attenuation of about 25.34%.In summary,compared with the Pt/C electrode doped with IrO_(2),the PtIr electrode had better initial polarization performance and excellent anti-electrode ability.This research is of great significance for the design of high-performance and durable catalytic layers of fuel cell MEA.

关 键 词：质子交换膜燃料电池 膜电极 抗反极 PtIr合金 

分 类 号：TM911[电气工程—电力电子与电力传动]