Triethanolamine-assisted surface reconstruction of nickel oxide for efficient oxygen evolution reaction†

IF 3.2 Q2 CHEMISTRY, PHYSICAL Energy advances Pub Date : 2024-09-26 DOI:10.1039/D4YA00420E
Jiayun Zhang, Ruth Knibbe and Ian Gentle
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Abstract

Developing low cost and highly efficient electrocatalysts for the oxygen evolution reaction (OER) is highly desired for renewable energy production. Ni-based electrocatalysts have been widely investigated as candidates for the OER, but developing a low-cost, easily synthesized electrocatalyst with high activity and good stability remains elusive. Herein, we report the facile electrodeposition of triethanolamine-decorated Ni oxide on carbon paper (Ni/CP-TEA) as an efficient electrocatalyst for water oxidation. Structural and experimental analyses reveal that the electrode surface is modified by triethanolamine (TEA) through Ni–N coordination bonding. The leaching of TEA drives rapid in situ surface reconstruction, facilitating the generation of high-valence Ni (Ni3+) species, thereby accelerating the OER performance. The Ni/CP-TEA exhibits enhanced electrocatalytic OER performance with a low overpotential of 320 mV at 10 mA cm−2 and good long-term stability. This work presents a simple route for the rational design of cost-effective and highly efficient OER catalysts.

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三乙醇胺辅助下的氧化镍表面重构,用于高效氧气进化反应†。
开发低成本、高效率的氧进化反应(OER)电催化剂是可再生能源生产的迫切需要。镍基电催化剂作为氧进化反应的候选催化剂已被广泛研究,但开发一种低成本、易合成、高活性和良好稳定性的电催化剂仍是一个难题。在此,我们报告了碳纸上三乙醇胺装饰氧化镍(Ni/CP-TEA)作为高效水氧化电催化剂的简便电沉积方法。结构和实验分析表明,电极表面通过 Ni-N 配位键被三乙醇胺 (TEA) 修饰。三乙醇胺的浸出推动了快速的原位表面重构,促进了高价镍(Ni3+)物种的生成,从而加速了 OER 性能的提高。Ni/CP-TEA 具有更强的电催化 OER 性能,在 10 mA cm-2 时过电位低至 320 mV,并具有良好的长期稳定性。这项工作为合理设计经济高效的 OER 催化剂提供了一条简单的途径。
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