Lyu Cheng, Loh Adeline, Jones Mikey, Trudgeon David, Corbin Jack, Cao Jianyun, Zhang Zhenyu, Connor Peter, Li Xiaohong
Renewable Energy Group, Department of Engineering, Faculty of Environment, Science and Economy, University of Exeter, Penryn Campus, Penryn, TR10 9FE, UK.
Camborne School of Mines, Department of Earth and Environmental Science, Faculty of Environment, Science and Economy, University of Exeter, Penryn, TR10 9FE, UK.
Chemistry. 2024 Nov 26;30(66):e202403030. doi: 10.1002/chem.202403030. Epub 2024 Nov 7.
Anion exchange membrane (AEM) water electrolysers have shown their potential in green hydrogen production. One of the crucial tasks is to 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 NiS 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 with Tafel slope of 67.9 mV dec recorded at 333 K. Long-term testing of the catalyst demonstrated steady performance over a 24 h period on microelectrode at 100 mA cm with only 71 mV and 37 mV overpotential increase at 293 K and 333 K respectively. Full cell testing with the optimised NiS as cathode and NiFe(OH) as anode showed 1.88 V after 1 h electrolysis at 500 mA cm in 1 M KOH under 333 K with FAA-3-30 membrane.
阴离子交换膜（AEM）水电解槽在绿色制氢方面已展现出潜力。关键任务之一是发现新型经济高效且可持续的电催化剂材料。在本研究中，通过一种简单的电沉积工艺，从改良的瓦特镀液配方制备了一种用于析氢反应的低成本镍硫基催化剂。物理表征方法表明该沉积膜为非晶态。使用旋转圆盘电极装置对硫化镍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于1 M氢氧化钾中表现出优异的催化性能，在333 K时，在10、100和1000 mA cm下的过电位分别为41 mV、111 mV和202 mV，塔菲尔斜率为67.9 mV dec。催化剂的长期测试表明，在微电极上于100 mA cm下进行24小时测试时性能稳定，在293 K和333 K时过电位仅分别增加71 mV和37 mV。以优化后的硫化镍作为阴极、氢氧化镍铁作为阳极，在333 K下于1 M氢氧化钾中使用FAA - 3 - 30膜，在500 mA cm下电解1小时后全电池测试显示电压为1.88 V。
