High-Coverage Ce(OH)₃-Decorated NiFe Layered Double Hydroxide for Durable Seawater Oxidation at Ampere-Scale Current Densities

IF 13 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Small Pub Date : 2025-06-05 DOI:10.1002/smll.202505219

Xiang Fang, Chun Ye, Weihua Zhuang, Yufan Yang, Shaohuan Hong, Shengjun Sun, Xun He, Fatma A. Ibrahim, Mohamed S. Hamdy, Feng Gong, Yongchao Yao, Xuping Sun, Wenchuang (Walter) Hu

引用次数: 0

Abstract

Seawater electrolysis powered by offshore renewable energy, provides an attractive approach for green hydrogen production. Yet, the abundant chloride ions (Cl⁻) in seawater pose severe challenges to the long-term stability of anode materials, particularly under industrial current densities. Herein, a high-coverage Ce(OH)₃-decorated nickel-iron layered double hydroxide (NiFe LDH) electrocatalyst is reported, in which Ce(OH)₃ undergoes in situ transformation into CeO₂ during alkaline seawater oxidation (ASO), forming a robust protective layer that effectively repels Cl⁻. The as-prepared catalyst delivers an overpotential of only 321 mV at 1 A cm⁻² and maintains exceptional operational stability for over 1000 h with negligible chlorine evolution. Furthermore, the catalyst exhibits accelerated bubble detachment behavior, facilitating rapid gas release and effectively reducing mass transfer resistance during ASO.

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高覆盖Ce（OH）₃-装饰NiFe层状双氢氧化物在安培级电流密度下持久的海水氧化

海洋可再生能源驱动的海水电解为绿色制氢提供了一种有吸引力的方法。然而，海水中大量的氯离子（Cl⁻）对阳极材料的长期稳定性构成了严峻的挑战，特别是在工业电流密度下。本文报道了一种高覆盖率的Ce（OH）₃修饰的镍铁层状双氢氧化物（NiFe LDH）电催化剂，其中Ce（OH）₃在碱性海水氧化（ASO）过程中原位转化为CeO 2，形成一个坚固的保护层，有效地抵抗Cl⁻。制备的催化剂在1 A cm - 2时的过电位仅为321 mV，并且在1000小时以上的时间内保持卓越的运行稳定性，氯的释放可以忽略不计。此外，该催化剂表现出加速的气泡脱离行为，促进了气体的快速释放，有效地降低了ASO过程中的传质阻力。

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

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

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