Cheng Lyu, Adeline Loh, Mikey Jones, David Trudgeon, Jack Corbin, Jianyun Cao, Zhenyu Zhang, Peter Connor, Xiaohong Li
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引用次数: 0
摘要
阴离子交换膜(AEM)水电解槽已显示出其在绿色制氢方面的潜力。其中一项关键任务是发现新型的经济高效且可持续的电催化剂材料。在本研究中,通过改进的瓦特浴配方,采用简单的电沉积工艺制备了一种用于氢气进化反应的低成本 Ni-S 基催化剂。物理表征方法表明,这种沉积膜是无定形的。使用旋转盘电极装置对 NixSy 催化剂的电沉积参数进行了优化。优化后的催化剂在微电极上的 1 M KOH 中表现出优异的催化性能,在 10、100 和 1000 mA cm-2 下的过电位分别为 41 mV、111 mV 和 202 mV,在 333 K 下的 Tafel 斜坡为 67.9 mV dec-1。以经过优化的 NixSy 为阴极、NiFe(OH-)2 为阳极进行的全电池测试表明,在 333 K 的 1 M KOH 溶液中,以 500 mA cm-2 的电流电解 1 小时后,FAA-3-30 膜的电压为 1.88 V。
Electrodeposition and optimisation of amorphous NixSy catalyst for hydrogen evolution reaction in alkaline environment.
Anion exchange membrane (AEM) water electrolyser has shown its potential in green hydrogen production. One of the crucial tasks is discover novel cost-effective and sustainable electrocatalyst materials. In this study, a low-cost Ni-S-based catalyst for hydrogen evolution reaction was prepared via a simple electrodeposition process from a modified Watts bath recipe. Physical characterisation methods suggest this deposit film to be amorphous. Optimisation of the electrodeposition parameters of the NixSy catalyst was carried out using a rotating disk electrode setup. The optimised catalyst exhibited excellent catalytical performance in 1 M KOH on a microelectrode, with overpotentials of 41 mV, 111 mV and 202 mV at 10, 100 and 1000 mA cm-2 with Tafel slope of 67.9 mV dec-1 recorded at 333 K. Long-term testing of the catalyst demonstrated steady performance over a 24 h period on microelectrode at 100 mA cm-2 with only 71 mV and 37 mV overpotential increase at 293 K and 333 K respectively. Full cell testing with the optimised NixSy as cathode and NiFe(OH-)2 as anode showed 1.88 V after 1 h electrolysis at 500 mA cm-2 in 1 M KOH under 333 K with FAA-3-30 membrane.
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