广州化学2026，Vol.51Issue(2)：27-32,6.DOI:10.16560/j.cnki.gzhx.20252731
电压循环工况对PEMFC阴极催化层衰减机制的影响
Effects of Voltage Cycling Conditions on the Degradation Mechanisms of PEMFC Cathode Catalyst Layers
摘要
Abstract
This study investigates the impact of voltage cycling conditions on the stability of the catalyst layer in proton exchange membrane fuel cells(PEMFCs).The results show that under high-voltage cycling(0.6～0.95 V),cell performance deteriorates significantly,with a 3.5％drop in open-circuit voltage and a 64％decrease in current density at 0.65 V.This is mainly due to accelerated dissolution and agglomeration of platinum(Pt),resulting in a 50％loss of electrochemical active surface area(ECSA)and increased corrosion of the carbon support.In contrast,low-voltage cycling(0.4～0.85 V)shows better stability,with only a 36％decrease in current density and a 30％loss of ECSA,as the milder potential window inhibits Pt dissolution and carbon support corrosion.Electrochemical impedance spectroscopy(EIS)analysis reveals that high-voltage cycling significantly increases charge transfer resistance,while low-voltage cycling mainly causes an increase in proton conduction impedance.Therefore,high voltage is a key factor affecting catalyst durability,and the voltage cycling range has a decisive impact on the attenuation behavior of PEMFC catalysts.关键词
质子交换膜燃料电池/电位循环/电化学活性面积/耐久性Key words
PEMFC/voltage cycling/ECSA/durability分类
能源科技引用本文复制引用
李松阳,豆少军,郝亮..电压循环工况对PEMFC阴极催化层衰减机制的影响[J].广州化学,2026,51(2):27-32,6.基金项目
上海市自然科学基金(25ZR1402378) （25ZR1402378）
