期刊
JOURNAL OF POWER SOURCES
卷 579, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2023.233263
关键词
Multi-cell electrolysis stack; Equivalent circuit model; Electric double-layer capacitance; Square-wave pulse current method
In recent years, there has been significant attention on the production of green hydrogen through water electrolysis, with a focus on the dynamic operation of electrolysis stacks. The electric double-layer capacitance (EDLC) is a key factor in determining stack performance and influencing dynamic behavior. High-frequency testing methods commonly used in laboratories are not suitable for cost-efficiency and pose a bottleneck for engineering power electronic devices. This study proposes a novel square-wave pulse current (SPC) method to determine EDLCs of multi-cell electrolysis stacks using industrial rectifiers. Experimental verification on a 2 Nm3/h alkaline water electrolysis stack achieved an accuracy of 2.67%.
In recent years, the green hydrogen production via water electrolysis has acquired significant attention, and the dynamic operation of electrolysis stacks has become a crucial research area. The electric double-layer capacitance (EDLC) is the primary factor indicating the performance of the stack and affecting the dynamic behavior of the electrolysis stack. High-frequency testing methods are commonly used to measure the EDLCs of electrolysis cells in laboratory, but these methods are not suitable for cost-efficiency and a bottleneck of the engineering power electronic devices. This study proposes a novel square-wave pulse current (SPC) method for determining the EDLCs of multi-cell electrolysis stacks using industrial rectifiers. The response of the stack subjected to SPC is analyzed based on a semi-empirical equivalent circuit (SEEC) model. The feasibility of the proposed method is verified through experiments on a 2 Nm3/h alkaline water electrolysis stack, and an accuracy of 2.67% is obtained.
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