Voltammetric and galvanostatic methods for measuring hydrogen crossover in fuel cell

Sida Li; Xuezhe Wei; Haifeng Dai; Hao Yuan; Pingwen Ming

doi:10.1016/j.isci.2021.103576

Voltammetric and galvanostatic methods for measuring hydrogen crossover in fuel cell

iScience. 2021 Dec 7;25(1):103576. doi: 10.1016/j.isci.2021.103576. eCollection 2022 Jan 21.

Authors

Sida Li^{1

2}, Xuezhe Wei^{1

2}, Haifeng Dai^{1

2}, Hao Yuan^{1

2}, Pingwen Ming^{1

2}

Affiliations

¹ School of Automotive Studies, Tongji University, Shanghai, China.
² Clean Energy Automotive Engineering Center, Tongji University, Shanghai, China.

Abstract

Hydrogen crossover rate is an important indicator for characterizing the membrane degradation and failure in proton exchange membrane fuel cell. Several electrochemical methods have been applied to quantify it. But most of established methods are too rough to support follow-up applications. In this paper, a systematic and consistent theoretical foundation for electrochemical measurements of hydrogen crossover is established for the first time. Different electrochemical processes occurring throughout the courses of applying potentiostatic or galvanostatic excitations on fuel cell are clarified, and the linear current-voltage behavior observed in the steady-state voltammogram is reinterpreted. On this basis, we propose a modified galvanostatic charging method with high practicality to achieve accurate electrochemical measurement of hydrogen crossover, and the validity of this method is fully verified. This research provides an explicit framework for implementation of galvanostatic charging method and offers deeper insights into the principles of electrochemical methods for measuring hydrogen crossover.

Keywords: Catalysis; Electrochemical energy production; Energy materials; Energy systems.