Boosting electrocatalytic activity toward alkaline hydrogen evolution by strongly coupled ternary Ni3S4/Ni/Ni(OH)2 hybrid. (20th June 2021)

• Record Type: Journal Article
• Authors: Yao, Zhongping; Wang, Jiankang; Wang, Yajing; Xie, Taiping; Li, Chunyan; Jiang, Zhaohua
• Is Part Of: Electrochimica acta. Volume 382(2021)
• Publication Date: 2021-06-20
• Subjects: Electrodeposition -- Hydrogen evolution reaction -- Ni3S4/Ni/Ni(OH)2 -- Synergistic effect; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.138342
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Ni3 S4 /Ni/Ni(OH)2 /TM was prepared by a simple one-pot electrodeposition method. The optimized Ni3 S4 /Ni/Ni(OH)2 /TM owned superior HER activity with η of 54 mV at −10 mA/cm 2 . Enhanced HER activity was due to synergistic and coupling effect between ternary materials. Abstract: Higher water dissociation barrier for Volmer step in alkaline hydrogen evolution greatly impedes its commercialization. In view of appropriate hydrogen binding strength on metallic Ni and promoted Volmer step on Ni(OH)2 as well as potential impact of Ni3 S4 on Ni/Ni(OH)2, Ni3 S4 /Ni/Ni(OH)2 on Ti mesh (TM) is prepared rapidly by a simple one-pot electrodeposition. The sample prepared under 0.2 M Ni(NO3 )2, 1.5 M thiourea and applied potential of -1.0 V (denoted as Ni3 S4 /Ni/Ni(OH)2 /TM-0.2) exhibits excellent HER activity with overpotential (η) of 54 mV at -10 mA/cm 2 and Tafel slope of 70 mV/dec, exceeding most of transitional metal-based electrocatalysts. The superior HER activity and long-term durability can be ascribed to strong synergistic effect and coupling effect between Ni3 S4, Ni and Ni(OH)2 . This work gives a simple and fast synthetic strategy for depositing highly active ternary Ni3 S4 /Ni/Ni(OH)2 hybrid HER electrocatalyst on conductive substrate surface, which is suitable for large-scale production. Graphical abstract: Image, graphical abstract Ni3 S4 /Ni/Ni(OH)2 on Ti mesh was synthesized by one-step electrodeposition and the optimized sample exhibited superb HER activity with overpotential (η) of 54 mV at -10 mA/cm 2 and long-term stability.