Malavekar D B, Lokhande V C, Patil D J, Kale S B, Patil U M, Ji T, Lokhande C D
Centre for Interdisciplinary Research, D. Y. Patil Education Society, Kolhapur 416 006, India.
Department of Electronics and Computer Engineering, Chonnam National University, Gwangju 61186, South Korea.
J Colloid Interface Sci. 2022 Mar;609:734-745. doi: 10.1016/j.jcis.2021.11.074. Epub 2021 Nov 17.
Development of electrocatalyst using facile way from non-noble metal compounds with high efficiency for effective water electrolysis is highly demanding for production of hydrogen energy. Nickel based electrocatalysts were currently developed for electrochemical water oxidation in alkaline pH. Herein, amorphous nickel tungstate (NiWO) was synthesized using the facile successive ionic layer adsorption and reaction method. The films were characterized by X-ray diffraction, Raman spectroscopy, Fourier transfer infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy techniques. The electrochemical analysis showed 315 mV of overpotential at 100 mA cm with lowest Tafel slope of 32 mV dec for oxygen evolution reaction (OER) making films of NiWO compatible towards electrocatalysis of water in alkaline media. The chronopotentiometry measurements at 100 mA cm over 24 h showed 97% retention of OER activity. The electrochemical active surface area (ECSA) of NW120 film was 25.5 cm.
采用简便方法由非贵金属化合物开发高效的电催化剂用于有效的水电解，对于氢能生产具有很高的需求。目前已开发出用于碱性pH值下电化学水氧化的镍基电催化剂。在此，采用简便的连续离子层吸附和反应法合成了非晶态钨酸镍（NiWO）。通过X射线衍射、拉曼光谱、傅里叶变换红外光谱、扫描电子显微镜、X射线光电子能谱和透射电子显微镜技术对薄膜进行了表征。电化学分析表明，在100 mA cm下析氧反应（OER）的过电位为315 mV，最低塔菲尔斜率为32 mV dec，这使得NiWO薄膜在碱性介质中对水电催化具有兼容性。在100 mA cm下进行24小时的计时电位测量表明，OER活性保留了97%。NW120薄膜的电化学活性表面积（ECSA）为25.5 cm。
