Carbon coated nickel - Nickel oxide composites as a highly efficient catalyst for hydrogen evolution reaction in acid medium
| Autor: | Na Li, Xiaozheng Li, Mei Chu, Zhizhong Xie, Lu Wang, Xi Li, Yongzhi Dong, Weiquan Cai, Chaocan Zhang, Meijing Hou, Yawei Lin |
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| Rok vydání: | 2018 |
| Předmět: |
Tafel equation
Materials science Carbonization Graphene General Chemical Engineering Nickel oxide Oxide chemistry.chemical_element 02 engineering and technology Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis law.invention Nickel chemistry.chemical_compound chemistry law Electrochemistry Composite material 0210 nano-technology |
| Zdroj: | Electrochimica Acta. 264:284-291 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2018.01.140 |
| Popis: | 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 H2SO4 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. |
| Databáze: | OpenAIRE |
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