Electrochemical and thermodynamic analysis of alkaline water electrolysis: Design and performance optimization

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-04-18 DOI:10.1016/j.ijhydene.2025.04.270

Siddique Mohd Umair , Emad Elnajjar , Bassam A. Abu-Nabah , Mohammad O. Hamdan

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Abstract

This study employs an electrochemical thermodynamic model to analyze the performance of an alkaline water electrolysis (AWE) system. The model is numerically solved using MATLAB to investigate the effects of key design parameters, including electrode thickness, electrode porosity, electrolyte concentration, electrode spacing, membrane thickness, and membrane porosity. Additionally, the study examines the influence of operating conditions such as temperature and pressure. A comparative analysis is conducted on the second-law efficiency of two high-pressure hydrogen production systems utilizing AWE: one integrating a high-pressure feed pump with AWE, and the other combining AWE with a high-pressure compressor. The results highlight the critical role of ohmic electrode resistance in cell performance, emphasizing the need for accurate modeling based on cell and electrode design. Notably, very thin or highly porous electrodes exhibit high ohmic resistance, leading to reduced AWE cell efficiency. Based on second-law efficiency analysis, the feed pump-coupled AWE system outperforms the AWE-compressor system across the pressure range of 0–100 bar, at an inlet temperature of 60 °C and a current density of 0.6 A/cm².

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碱水电解的电化学与热力学分析：设计与性能优化

本研究采用电化学热力学模型分析碱性电解（AWE）系统的性能。利用MATLAB对模型进行数值求解，研究电极厚度、电极孔隙率、电解质浓度、电极间距、膜厚度和膜孔隙率等关键设计参数对模型的影响。此外，该研究还考察了操作条件（如温度和压力）的影响。对比分析了两种利用AWE的高压制氢系统的第二定律效率，一种是将高压进料泵与AWE集成，另一种是将AWE与高压压缩机相结合。研究结果强调了欧姆电极电阻在电池性能中的关键作用，强调了基于电池和电极设计的精确建模的必要性。值得注意的是，非常薄或高度多孔的电极具有高欧姆电阻，导致AWE电池效率降低。基于第二定律效率分析，在0-100 bar的压力范围内，进气温度为60℃，电流密度为0.6 a /cm2时，进气泵耦合AWE系统优于AWE-压缩机系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.