Catalytic ‘gelectrodes’ based on Co and Ni–Fe oxy/hydroxides for sustainable and enhanced oxygen evolution reaction,Journal of Materials Chemistry A

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Catalytic ‘gelectrodes’ based on Co and Ni–Fe oxy/hydroxides for sustainable and enhanced oxygen evolution reaction
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-09-12 , DOI: 10.1039/d4ta03866e
Anu Bovas ₁ , T. P. Radhakrishnan ₁

Affiliation

Development of cost-effective catalysts providing low overpotentials and enhanced efficiency is a critical goal of contemporary research on electrochemical water splitting and other technologically significant processes. Translation to practical applications demands that they should also enable high current densities to be extracted. A simple strategy of encapsulating the active electrocatalyst in hydrogel polymer matrices is shown to provide a facile solution in several respects, especially regarding the last criterion. The concept is illustrated using two examples of ‘gelectrodes’ based on nanocomposites of cobalt oxyhydroxide and nickel–iron hydroxide with chitosan on nickel foam, and their efficient mediation of the oxygen evolution reaction (OER). Comparison with control systems show that significantly lower overpotentials and higher current densities with extended temporal stability can be achieved with the gelectrodes; the cobalt oxyhydroxide – chitosan and nickel-iron hydroxide – chitosan systems provide stable current densities up to 1.6–1.7 A cm⁻² for the OER with alkaline aqueous electrolyte. This simple design strategy opens up a general route to technologically useful electrocatalyst performance.

中文翻译：

基于 Co 和 Ni-Fe 氧化物/氢氧化物的催化“g 电极”，用于可持续和增强的析氧反应

开发具有低过电势和提高效率的经济高效的催化剂是当代电化学水分解和其他技术重要过程研究的关键目标。转化为实际应用要求它们还应该能够提取高电流密度。将活性电催化剂封装在水凝胶聚合物基质中的简单策略被证明可以在几个方面提供简便的解决方案，特别是关于最后一个标准。使用两个基于羟基氧化钴和氢氧化镍铁与泡沫镍上的壳聚糖纳米复合材料的“g电极”示例来说明这一概念，以及它们对析氧反应（OER）的有效介导。与控制系统的比较表明，使用 g 电极可以实现显着较低的过电势和较高的电流密度以及扩展的时间稳定性；羟基氧化钴-壳聚糖和氢氧化镍铁-壳聚糖系统可为碱性水电解质的OER提供高达1.6–1.7 A cm ^-2的稳定电流密度。这种简单的设计策略开辟了一条实现技术上有用的电催化剂性能的通用途径。

更新日期：2024-09-12

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