材料科学
镍
电解
催化作用
电流(流体)
碱性水电解
氢
无机化学
铅(地质)
分解水
电解水
化学工程
冶金
电解质
物理化学
热力学
有机化学
化学
电极
物理
光催化
地貌学
工程类
地质学
作者
Sang‐Mun Jung,Yoona Kim,Byung‐Jo Lee,Hyeonjung Jung,Jaesub Kwon,Jinhyeon Lee,Kyu‐Su Kim,Young‐Woo Kim,Ki‐Jeong Kim,Hyun‐Seok Cho,Jong Hyeok Park,Jeong Woo Han,Yong‐Tae Kim
标识
DOI:10.1002/adfm.202316150
摘要
Abstract Alkaline water electrolysis (AWE) systems offer a cost‐effective and scalable approach for large‐scale hydrogen production using renewable energy sources. However, their susceptibility to load fluctuations, particularly the reverse‐current (RC) phenomenon during shutdown events, poses a significant challenge to the long‐term stability and scalability of these systems. Herein, a catalytic approach for enhancing the RC tolerance in AWE systems by using Pb‐decorated Ni cathode catalysts (Pb/Ni) is introduced. The oxidation of Pb/Ni by repeated RC lowers the electromotive force for the reverse current operation, and consequently, imparts RC tolerance. Intriguingly, contrary to the expectation that the decoration with lead, an inert material for the hydrogen evolution reaction (HER), will interfere with the hydrogen generation of the Ni catalyst, the presence of Pb on the Ni cathode after the RC flow promotes both the proton desorption and water‐dissociation steps, improving the HER activity. Furthermore, the AWE stack testing with Pb/Ni catalysts is perfectly operated, demonstrating remarkably enhanced RC tolerance during startup/shut‐down (SU/SD) testing protocol. This paper presents a new strategy for mitigating the AWE performance degradation induced by RC flow and for achieving Pb/Ni catalysts with improved operational durability against RC flow in AWE systems.
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