Enhanced Hydrogen Evolution Activity of Ni/Ni3S2 Nanosheet Grown on Ti Mesh by Cu Doped Ni. Issue 2 (1st January 2019)

• Record Type: Journal Article
• Authors: Wang, Jiankang; Wang, Yajing; Yao, Zhongping; Xie, Taiping; Deng, Qihuang; Jiang, Zhaohua; Zhu, Quanxi; Liu, Songli; Peng, Yuan; Zhang, Xiaodong
• Is Part Of: Journal of the Electrochemical Society. Volume 166:Issue 2(2019)
• Page Start: F168
• Page End: F173
• Publication Date: 2019-01-01
• Subjects: Electrocatalysis -- Electrodeposition -- Energy Conversion; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1401902jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Optimizing electronic structure and surface morphology are of great importance to achieve highly active and stable electrocatalyst for hydrogen evolution reaction (HER). In this paper, the vertically aligned Cu doped Ni/Ni3 S2 nanosheet was successfully deposited on Ti mesh (NiCux /Ni3 S2 /TM, x = Cu/Ni atomic ratio in NiCux ) by facile electrodeposition method. Phase composition, surface morphology and electronic structure information were characterized by XRD, SEM, TEM and XPS. The results unraveled that Cu doping induced the changes in both electronic structure and surface morphology of Ni/Ni3 S2 sample, which were in favor of promoting the breakage of H-O bond in H2 O and optimizing Ni-Hads adsorption energy, thus improving HER activity with decreased overpotential at −10 mA/cm 2 by 202 mV. The influence of Cu(NO3 )2 precursor content on HER activity of as-prepared NiCux /Ni3 S2 / TM was investigated. NiCu0.57 /Ni3 S2 /TM prepared with 1.2 mM Cu(NO3 )2 exhibited the highest electrocatalytic activity toward HER with overpotential of 239 mV at −10 mA/cm 2 and Tafel slope of 86 mV/dec. The enhanced activity and superior stability for NiCu0.57 /Ni3 S2 /TM were ascribed to the change in electronic structure and surface morphology.