Polycalmagite Coating Enables Long-Term Alkaline Seawater Oxidation Over NiFe Layered Double Hydroxide

IF 13 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Small Pub Date : 2025-01-21 DOI:10.1002/smll.202408642

Zixiao Li, Wei Zuo, Chaozhen Liu, Chaoxin Yang, Zhengwei Cai, Shengjun Sun, Meng Yue, Min Zhang, Xiaoyan Wang, Hefeng Wang, Dongdong Zheng, Asmaa Farouk, Fatma A. Ibrahim, Feng Gong, Yanqin Lv, Xuping Sun, Bo Tang

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Abstract

Renewable energy-powered seawater electrolysis is a green and attractive technique for producing high-purity hydrogen. However, severe chlorideions (Cl⁻) and their derivatives tend to corrode anodic catalysts at ampere-level current densities and hinder the application of seawater-to-H₂ systems. Herein, a polycalmagite (PCM)-coated NiFe layered double hydroxide is presented on Ni foam (NiFe LDH@PCM/NF) that exhibits exceptional stability in alkaline seawater. PCM not only acts as a conductive layer to reduce charge transfer resistance of the anodes but also as a polymer-based protective layer to inhibit Cl⁻ adsorption and stabilize metal ions oxidation due to its own anions and strong adhesion, thereby increasing activity and stability during alkaline seawater. Thus, NiFe LDH@PCM/NF only needs a low overpotential of 364 mV to reach up to 1000 mA cm⁻² and maintains operation for 500 h without activity degradation. Moreover, a minimal amount of hypochlorite can be detected in electrolyte after a 500-h stability test. This development affords a significant exploration in creating durable and efficient anodes, highlighting the importance of polymer coating toward anti-corrosion in alkaline seawater oxidation.

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聚钙马石涂层可在NiFe层状双氢氧化物上实现碱性海水的长期氧化

可再生能源驱动的海水电解是一种绿色且有吸引力的生产高纯度氢的技术。然而，强氯离子（Cl−）及其衍生物在安培级电流密度下容易腐蚀阳极催化剂，阻碍了海水制氢体系的应用。本文在Ni泡沫（NiFe LDH@PCM/NF）上制备了聚钙马石（PCM）涂层的NiFe层状双氢氧化物，该材料在碱性海水中表现出优异的稳定性。PCM不仅可以作为导电层降低阳极的电荷转移阻力，而且由于其自身阴离子和强附着力，PCM还可以作为聚合物基保护层抑制Cl -的吸附，稳定金属离子的氧化，从而提高碱性海水中的活性和稳定性。因此，NiFe LDH@PCM/NF只需要364 mV的低过电位就可以达到1000 mA cm - 2，并保持运行500小时而不降低活性。此外，经过500小时的稳定性测试，电解质中可以检测到少量的次氯酸盐。这一进展为制造耐用高效的阳极提供了重要的探索，突出了聚合物涂层在碱性海水氧化中抗腐蚀的重要性。

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

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.