Carbon coated nickel - Nickel oxide composites as a highly efficient catalyst for hydrogen evolution reaction in acid medium. (20th February 2018)

• Record Type: Journal Article
• Authors: Chu, Mei; Wang, Lu; Li, Xi; Hou, Meijing; Li, Na; Dong, Yongzhi; Li, Xiaozheng; Xie, Zhizhong; Lin, Yawei; Cai, Weiquan; Zhang, Chaocan
• Is Part Of: Electrochimica acta. Volume 264(2018)
• Page Start: 284
• Page End: 291
• Publication Date: 2018-02-20
• Subjects: Metal organic framework -- Nickel -- Nickel oxide -- Graphene -- Hydrogen evolution reaction; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.01.140
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Carbon coated nickel - nickel oxide composites (Ni/NiO@C/GR- t - w ) was synthesized from the direct carbonization of the composites composed of Ni-MOF-74 and graphene oxide (GO). Due to the synergetic effects of Ni, NiO and graphene, Ni/NiO@C/GR- t - w all exhibited the electrocatalytic performance to HER in acidic medium. When the GO content was 8% and the carbonization temperature was 900 °C, the composites (Ni/NiO@C/GR-900-8) showed the best electrocatalytic properties with an lower overpotential of 108 mV ( vs . RHE) at 10 mA cm −2, a smaller Tafel slope of 44 mV dec −1 and a good stability in a 0.5 M H2 SO4 solution. The excellent electrocatalytic performance enabled Ni/NiO@C/GR composites to be a favorable HER catalyst to replace the expensive Pt-based materials in the applications of the hydrogen production. Graphical abstract: Highlights: Composites Ni/NiO@C/GR were synthesized by direct carbonization of MOF-74/GO hybrids. Ni/NiO@C/GR-900-8 showed excellent electrocatalytic activity to HER in acidic medium. Overpotential at 10 mA cm −2 was 108 mV ( vs. RHE). Onset potential and Tafel slope of HER was −34.7 mV and 44 mV dec −1, respectively. Potential hardly shifted during 24 h experiment, indicating good stability.