钼钴二元硫化物制备及其电解水性能研究

doi:10.19964/j.issn.1006-4990.2021-0255

摘要/Abstract

摘要：

为提升硫化钼全解水的催化能力,采用一步电沉积的方法在镍钴氧化物（NCO）基底上成功制备了钼钴二元硫化物复合电极,研究了添加剂、钼钴物质的量比和沉积时间对电极电催化性能的影响。实验结果表明,采用氟化铵作为添加剂、钼钴物质的量比为5∶7且沉积时间为750 s时,制备的Mo₅Co₇S_x@NCO-750电极具有最佳电催化活性,其析氢反应（HER）过电位和Tafel斜率分别为115 mV和67 mV/dec,析氧反应（OER）过电位和Tafel斜率分别为259 mV和42 mV/dec,全解水时槽压为1.61 V。复合电极电催化性能的提升一方面得益于钴的引入,在硫化钼中形成了高导电性和高催化活性的异质界面,另一方面材料中还存在丰富的具有优异电催化活性的缺陷位点。

关键词: 电沉积, 硫化钼, 析氢反应, 析氧反应, 全解水

Abstract:

To improve the water splitting activity of molybdenum sulfide,the molybdenum-cobalt binary sulfide composite electrode was successfully prepared on nickel-cobalt oxides（NCO） substrate by one-step electrodeposition method.The effect of additives,the mole ratio between Mo to Co,and deposition time on the electrocatalytic activity of the electrode were inves-tigated.The experimental result showed that the electrode Mo₅Co₇S_x@NCO-750 prepared with ammonium fluoride as additive and molybdenum cobalt molar ratio of 5∶7 deposition for 750 s had the best electrocatalytic activity.The HER overpotential and Tafel slope of were 115 mV and 67 mV/dec,respectively,the OER overpotential and Tafel slope were 259 mV and 42 mV/dec,respectively.The cell voltage was 1.61 V under total water splitting.The improvement of electrocatalytic performance of Mo₅Co₇S_x@NCO-750 electrode was attributed to the heterogeneous interface with high conductivity and catalytic activity formed by the introduction of cobalt in molybdenum sulfide,besides,there were abundant defect sites with excellent electrocatalytic activity in the materials.

Key words: electrodeposition, molybdenum sulfide, hydrogen evolution reaction, oxygen evolution reaction, total water splitting

中图分类号:

TQ125.1

唐虎,刘昉. 钼钴二元硫化物制备及其电解水性能研究[J]. 无机盐工业, 2022, 54(2): 65-71.

TANG Hu,LIU Fang. Study on preparation of molybdenum cobalt binary sulfide and its performance in water splitting[J]. Inorganic Chemicals Industry, 2022, 54(2): 65-71.

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