Optimization of Ni-Mo-Coated Stainless Steel as a High-Performance Cathode in Alkaline Water Electrolysis

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2023-01-30 DOI:10.1007/s12678-023-00810-5

Mohammad Zhiani, Mohammad Mohammadi Taghiabadi, Mohammad Hassan Bagherabadi

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Abstract

Considering the widespread use of alkaline water electrolysis (AWE) in the chemical industry and the growing need to design and manufacture low-cost and efficient electrodes, the optimization of a Ni-Mo-coated stainless steel substrate is investigated in the present work to use this substrate as a cathode of an alkaline water electrolyzer. The crystallographic structure, surface morphology, and composition of the optimized coating are characterized by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), and surface elemental mapping. The electrocatalytic activity for the hydrogen evolution reaction (HER) is evaluated by making electrochemical measurements. In addition, the optimization of the electrodeposition bath is investigated to promote the HER activity. The results show that nickel-molybdenum (1:2) alloy exhibits a higher HER activity, and a current density of 180 mA cm⁻² is achieved at −1.7 V vs. Ag/AgCl using this coating. Also, the polarization curves of the electrolysis cell demonstrate that using the optimized cathode, the cell operates at 1.9 V at a current density of 1.5 A.cm⁻² and the operating temperature of 60 °C, which is suitable for use in large-scale industrial AWE units.

Graphical Abstract

Abstract Image

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镍钼包覆不锈钢作为高性能阴极在碱性水电解中的优化

考虑到碱性水电解(AWE)在化学工业中的广泛应用以及对设计和制造低成本和高效电极的日益增长的需求，本工作对镍钼涂层不锈钢衬底作为碱性水电解槽阴极进行了优化研究。通过x射线衍射分析(XRD)、扫描电子显微镜(SEM)和表面元素映射对优化涂层的晶体结构、表面形貌和成分进行了表征。通过电化学测量评价了析氢反应的电催化活性。此外，还对电沉积槽的优化进行了研究，以提高HER活性。结果表明，镍钼(1:2)合金具有较高的HER活性，在−1.7 V条件下，与Ag/AgCl相比，该涂层可获得180 mA cm−2的电流密度。电解池的极化曲线表明，采用优化后的阴极，电解池在1.5 a .cm - 2电流密度下工作电压为1.9 V，工作温度为60℃，可用于大型工业AWE装置。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

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