不同方法对燃料电池堆性能恢复的影响OA

The performance degradation of proton exchange membrane fuel cell(PEMFC)after durability testing usually includes both reversible and irreversible degradation.This paper quantifies the proportion of reversible and irreversible degradation by conducting performance tests on a 60kW fuel cell stack after initial activation,after 2000 hours of durability testing,and after stack treatments using different methods including purging,large-current and oxygen starvation.The main causes of reversible degradation are also analyzed.The test results show that after durability testing,the overall power degradation of the stack is 2.39%,with reversible degradation accounting for 1.40%and irreversible degradation 0.99%.The reversible degradation is mainly achieved through the reduction of oxides and the optimization of the microstructure in the cathode catalyst layer.Moreover,the large-current activation method is more effective during the initial offline activation,but after durability testing,its effect is less significant.Oxygen starvation activation can effectively restore the stack performance.