Electronic structure modulation of bifunctional oxygen catalysts for rechargeable Zn–air batteries
| Autor: | Jing-Yin Xu, Le Chang, Liping Wang, Yanning Zhang, Heng Guo, Fei Xiang, Xiaobin Niu, Jian Yang, Zhiming Wang, Feng Hao, Jiachen Sun |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Doping Oxygen evolution chemistry.chemical_element 02 engineering and technology General Chemistry Carbon nanotube Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Oxygen 0104 chemical sciences law.invention Catalysis chemistry.chemical_compound chemistry Chemical engineering law General Materials Science 0210 nano-technology Bifunctional Cobalt |
| Zdroj: | Journal of Materials Chemistry A. 8:1229-1237 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c9ta11654k |
| Popis: | Extensive efforts have been devoted to develop bifunctional oxygen catalysts for rechargeable zinc–air batteries (ZABs) owing to the extremely high specific energy density, low cost and safety of these emerging batteries. The oxygen catalysts play roles in maximizing the energy conversion efficiencies of ZABs. Herein, a strategy of electronic structure modulation is used by ruthenium doping and post-oxidation treatment in cobalt encapsulated N-doped carbon nanotubes for enhancing catalytic activities of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). First principles calculations reveal that doping Ru into Co or CoOx enhances charge transfer from Ru to carbon atoms adjacent to the doped N atom and then promotes the reversible oxygen reactions. The achieved catalysts (denoted as RuCoOx@Co/N-CNT) exhibit efficient catalytic activities driving both ORR and OER with a small overpotential gap (EOER − EORR = 0.79 V). Specifically, the ZABs assembled with RuCoOx@Co/N-CNT catalysts display an open-circuit potential of 1.44 V, a specific capacity of 788 mA h g−1, a power density of 93 mW cm−2 and long-term discharge–charge cycling stability, even superior to those of commercial Pt/C and RuO2 electrodes. This work proves that modulating the electronic structure of active sites by doping or post oxidation treatment is an efficient way to improve the catalytic performance. |
| Databáze: | OpenAIRE |
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