Stability Investigation on NiFeOx Electrocatalysts for Oxygen Evolution During on and off Cycles in Harsh Alkaline Conditions

IF 3.5 4区化学 Q2 ELECTROCHEMISTRY

ChemElectroChem Pub Date : 2025-06-20 DOI:10.1002/celc.202500081

Reona Suzuki, Keisuke Obata, Yutaka Sasaki, Kiyohiro Adachi, Kazuhiro Takanabe

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Abstract

Water electrolysis powered by renewable energy sources is a mature and practical technique to produce green hydrogen. Its production cost is heavily influenced by efficiency and durability, with a particular concern being the durability of anodes for oxygen evolution reaction (OER) in highly oxidative and acidic/alkaline environments at elevated temperatures. Durability during intermittent operations with renewable sources, factoring in on/off cycling, is also a consideration. This study investigates the durability of NiFeO_x, one of the most active electrocatalysts in alkaline conditions, under various conditions including industrially relevant conditions: 7 M KOH at 80 °C and 600 mA cm⁻². The results show that on/off operations with extensive potential variation caused severe degradations compared to constant OER operations. However, stability improves slightly with the addition of saturated Fe³⁺ ions into the electrolyte, preventing Fe leaching. By dissecting the degradation mechanism step-by-step, this study illuminates the limitations and assists in creating strategies for highly durable electrolysis systems.

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碱性条件下NiFeOx析氧电催化剂开、关循环稳定性研究

以可再生能源为动力的水电解是一种成熟实用的生产绿色氢的技术。其生产成本在很大程度上受效率和耐用性的影响，特别是在高温高氧化和酸性/碱性环境下的析氧反应（OER）阳极的耐用性。在可再生能源间歇作业期间，考虑到开/关循环，耐久性也是一个考虑因素。NiFeOx是碱性条件下最活跃的电催化剂之一，本研究考察了NiFeOx在各种条件下的耐久性，包括工业相关条件：7 M KOH， 80°C, 600 mA cm−2。结果表明，与恒定的OER操作相比，具有广泛潜在变化的开/关操作会导致严重的退化。然而，在电解质中加入饱和Fe3+离子后，稳定性略有提高，从而防止了铁的浸出。通过逐步剖析降解机制，本研究阐明了其局限性，并有助于创建高度耐用的电解系统策略。

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来源期刊

ChemElectroChem ELECTROCHEMISTRY-

CiteScore

7.90

自引率

2.50%

发文量

515

审稿时长

1.2 months

期刊介绍： ChemElectroChem is aimed to become a top-ranking electrochemistry journal for primary research papers and critical secondary information from authors across the world. The journal covers the entire scope of pure and applied electrochemistry, the latter encompassing (among others) energy applications, electrochemistry at interfaces (including surfaces), photoelectrochemistry and bioelectrochemistry.