Tuning polyoxometalate composites with carbonaceous materials towards oxygen bifunctional activity
| Autor: | Debaprasad Mandal, Tharamani C. Nagaiah, Subhasis D. Adhikary, Divyani Gupta, Alankar Kafle |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Oxygen evolution chemistry.chemical_element 02 engineering and technology General Chemistry Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Oxygen 0104 chemical sciences Bifunctional catalyst Catalysis chemistry.chemical_compound Chemical engineering chemistry Polyoxometalate General Materials Science 0210 nano-technology Bifunctional |
| Zdroj: | Journal of Materials Chemistry A. 9:9228-9237 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | Oxygen electrochemistry plays an imperative role in renewable energy systems. Development of non-precious metals and efficient bifunctional catalysts for the oxygen reduction reaction and oxygen evolution reaction (ORR & OER) is highly demanded for metal–air batteries. Herein, a conjugate of tetra-cobalt sandwich polyoxometalate [Co4(H2O)2(PW9O34)2]10− (CoPOM) and polyvinyl butyl imidazolium (PVIM) (PVIM–CoPOM) supported on carbonaceous materials was explored as an oxygen bifunctional catalyst in alkaline media. The PVIM–CoPOM/NCNT composite is highly active towards ORR and OER. The novel composite exhibits a low overpotential (ηj10) of 0.28 V vs. RHE for OER, outperforming the state-of-the-art RuO2 catalyst (0.35 V), and a comparable ORR activity to Pt/C with similar overall oxygen electrode activity to the benchmark precious metal catalyst. A conventional Zn–air battery with the PVIM–CoPOM/NCNT air cathode shows high energy density and a low charge–discharge potential gap. |
| Databáze: | OpenAIRE |
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