In-operando impedance spectroscopy study for accelerated lifetime studies of dynamic alkaline water electrolysis under industrial conditions

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-05-12 DOI:10.1016/j.ijhydene.2025.05.055

Kevin M. Cole , Nigel Patterson , Jing Zeng , Mariam Awara , Thomas A. Albrecht

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Abstract

Dynamic alkaline water electrolysis is positioned to provide high volume, economical green hydrogen when coupled to renewable energy sources. Accelerated lifetime testing (ALTs) reduces development time, but the degradation pathways must be known under industrial operating conditions to establish a meaningful relationship to real-life degradation. In-operando electrochemical impedance spectroscopy (EIS) was run throughout a dynamic range of current densities spanning 0.1–1.5 A cm⁻² under different current profiles simulating steady-state, renewable cycling, and square-wave in 30 wt% potassium hydroxide. The two cells: either a Raney Ni or non-platinum group metal (PGM) anode, exhibited distinct impedance behavior under renewable and square-wave conditions compared to normal steady-state operation. The change of impedance was quantified to derive square-wave acceleration factors of 1.5x for Raney Ni and 2.1x for non-PGM, but for different profiles. These findings highlight the need to develop more purposeful ALTs and how in-operando EIS can be used to study and quantify degradation modes for developing them.

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工业条件下动态碱性电解加速寿命研究的运行阻抗谱研究

动态碱性电解定位于与可再生能源相结合时提供高容量，经济的绿色氢气。加速寿命测试（ALTs）减少了开发时间，但是必须在工业操作条件下了解降解途径，以建立与实际降解的有意义的关系。在运行中电化学阻抗谱（EIS）在0.1-1.5 a cm−2的动态电流密度范围内运行，在30wt %氢氧化钾中模拟稳态、可再生循环和方波的不同电流分布。这两种电池：Raney Ni或非铂族金属（PGM）阳极，在可再生和方波条件下与正常稳态工作相比，表现出不同的阻抗行为。对阻抗的变化进行量化，得出Raney Ni的方波加速度因子为1.5倍，非pgm的方波加速度因子为2.1倍，但不同剖面的方波加速度因子不同。这些发现强调了开发更有目的的人工智能的必要性，以及如何使用在操作中的环境影响评估来研究和量化开发人工智能的降解模式。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.