期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 10, 期 11, 页码 5925-5929出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta08050d
关键词
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资金
- National Key Research and Development Program [2018YFB1502503]
- Sichuan Science and Technology Program [2020YJ0299]
- Projects of International Cooperation and Exchanges NSFC [21761162015]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJQN201801125]
A highly efficient ORR electrocatalyst with Fe-N-4 active sites was synthesized on a three-dimensional interconnected porous nitrogen-doped carbon network, showing superior activity and stability in the oxygen reduction reaction. This catalyst has great potential for practical application in zinc-air batteries.
Here, we report a highly efficient ORR electrocatalyst with Fe-N-4 active sites uniformly dispersed on a three-dimensional (3D) interconnected porous nitrogen-doped carbon network synthesized by pyrolyzing SiO2@ZIF-8 composites loaded with iron salts. The as-prepared single-atom Fe 3D-ordered mesoporous carbon (SA-Fe-3DOMC) possesses a high specific surface area of 1357.8 m(2) g(-1) and a high Fe loading of 0.84 wt% as well. Benefiting from these favourable structural properties, SA-Fe-3DOMC exhibits a superior ORR half-wave potential (E-1/2) of 0.901 V and negligible activity loss (only 3 mV) after 10 000 cycles in alkaline media, surpassing the state-of-the-art Pt/C electrocatalyst. Particularly, an integrated zinc-air battery with SA-Fe-3DOMC as the air electrode shows a remarkable peak power density (140 mW cm(-2)) and a high specific capacity (786.6 mA h g(-1)), demonstrating great potential for practical application.
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