Design of an amorphous and defect-rich CoMoOF layer as a pH-universal catalyst for the hydrogen evolution reaction
| Autor: | Rui Deng, Yashi Chen, Lei Lei, Sha Chen, Danlian Huang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Tafel equation
Materials science Renewable Energy Sustainability and the Environment 02 engineering and technology General Chemistry Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Anode Amorphous solid Chemical engineering General Materials Science Graphite 0210 nano-technology Porosity Bimetallic strip |
| Zdroj: | Journal of Materials Chemistry A. 9:8730-8739 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | Herein, a brief structural design strategy is proposed to fabricate amorphous CoMo bimetallic oxyfluoride on graphite felt (CoMoOF/GF) for efficient hydrogen evolution reaction (HER). Porous and defective CoMoO/GF is employed as a structure-induced template to induce the formation of CoMoOF/GF with more rich defects and a larger pore structure via proper anodic treatment. Theoretical calculations reveal a synergistic catalytic effect stemming from the CoMo bimetallic components, endowing CoMoOF/GF with more favorable HER performance. The amorphous construction endows the catalyst with remarkable mass transfer ability and sufficient exposed atoms, enhancing the electrochemically active surface area (ECSA). CoMoOF/GF with structural advantages and the synergistic effect of bimetallic components displays a considerably low overpotential of 79 mV at η10 and a Tafel slope of 43.3 mV dec−1 for the HER in alkaline medium. Furthermore, excellent activity with an overpotential of 94 mV at η10 and a Tafel slope of 60.2 mV dec−1 is observed in acidic medium as well. Besides, long-term stability is achieved within CoMoOF/GF when operating at −200 mV for 100 h. |
| Databáze: | OpenAIRE |
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