期刊
CHEMICAL ENGINEERING JOURNAL
卷 431, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133210
关键词
Rechargeable Zn-air batteries; Bifunctional catalysts; B,N-codoped carbon; Air diffusion electrode; Oxygen utilization and transfer efficiency
资金
- National Natural Science Foundation of China [21573115, 21875118, 22111530112]
- Natural Science Foundation of Tianjin [19JCZDJC37700]
- Tianjin Research Innovation Project for Postgraduate Students [2020YJSB146]
- Candidate Research Innovation Fund of NKU School of Materials Science and Engineering
A novel gas-breathing integrated air diffusion electrode based on B,N-codoped carbon is designed to improve the oxygen utilization efficiency and performance of rechargeable Zn-air batteries. Experimental results show that compared to conventional cathodes, the gas-breathing electrode exhibits reduced overpotential, higher power density, and longer lifespan.
Rechargeable Zn-air batteries (ZABs) are promising candidates for next-generation sustainable energy storage due to high theoretical energy density and inherent safety. For further practical applications, in addition to developing bifunctional cathode catalysts, there is still a significant performance bottleneck of poor oxygen utilization efficiency in conventional air cathodes, which is often overlooked. To address this problem, a novel gas-breathing integrated air diffusion electrode based on B,N-codoped carbon (BN-C/ADE) is designed, which combines gas-diffusion layers and catalyst layers into a single architecture. The hydrophobic diffusion layer with substantial channels promotes active diffusion of oxygen from air atmosphere to reaction interface without the need for an air pump. Consequently, compared with the conventional cathode, a reduced overpotential, higher power density (118.5 mW cm(-2)) and long lifespan (over 170 h) are obtained for liquid ZABs based on BN-C/ADE, even without external oxygen-pumping equipment, profiting from higher oxygen utilization and transfer efficiency.
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