Load changing characteristics of the hydrogen‐air and hydrogen‐oxygen proton exchange membrane fuel cells

Huang, Zhenyu, Xing, Lu and Tu, Zhengkai (2021) Load changing characteristics of the hydrogen‐air and hydrogen‐oxygen proton exchange membrane fuel cells. International Journal of Energy Research. ISSN 0363-907X (In Press)

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Official URL: https://doi.org/10.1002/er.7306

Abstract

Load changing performance is significant for the application of proton exchange membrane fuel cells (PEMFCs). This paper compares experimental results of the hydrogen-air and hydrogen-oxygen PEMFC and analyzes their dynamic performance under various operating conditions. We use electrochemical impedance spectroscopy to investigate the intrinsic mechanism during load changing. Due to the higher oxygen concentration, the hydrogen-oxygen PEMFC responds faster (within 1 second) and operates more steadily than the hydrogen-air PEMFC (2-20 seconds). The experimental results show that the total polarization resistance of the hydrogen-air PEMFC and the Ohmic resistance of the hydrogen-oxygen PEMFC decrease dramatically with the appropriately increased operating temperature. Whereas at over-elevated operating temperature, the resistance value increases due to the dehydration of the membrane electrode assembly. Load changing performance can be improved by increasing operating pressure and relative humidity. Increased stoichiometry is beneficial for the hydrogen-air PEMFC, while the opposite trend is observed for the hydrogen-oxygen PEMFC.

Item Type: Article
Additional Information: Funding information: Plan Project of Science and Technology of Zhuhai, Grant/Award Number: ZH22044702190139HJL; Wuhan Applied Foundational Frontier Project, Grant/Award Number: 2020010601012205; Natural Science Foundation of Hubei Province, Grant/Award Number: 2020CFA040; National Natural Science Foundation of China, Grant/Award Numbers: 52076096, 51776144
Uncontrolled Keywords: resistance, proton exchange membrane fuel cell, load changing, electrochemical impedance spectroscopy
Subjects: H300 Mechanical Engineering
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Rachel Branson
Date Deposited: 23 Sep 2021 09:44
Last Modified: 24 Sep 2021 08:15
URI: http://nrl.northumbria.ac.uk/id/eprint/47333

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