Journal
ACS ENERGY LETTERS
Volume 3, Issue 12, Pages 2914-2920Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b01717
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Funding
- National Natural Science Foundation of China [51631001, 51590882, 51672010, 81421004]
- National Key R&D Program of China [2017YFA0206301, 2016YFA0200102]
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Developing noble metal-free bifunctional oxygen electrocatalysts is vital for metal-air batteries. Herein, we present a facile approach to fabricating N-doped carbon nanosheet networks with metal nanoparticles (M/N-CNSNs) readily converted from metal-organic frameworks. The resultant Co/N-CNSNs show superior bifunctional oxygen catalytic activity attributed to the efficient active sites and fast mass diffusion enabled by the nanosheet structure. It is worth noting that the first-principles studies prove the Co/N-C sites to be the oxygen reduction reaction active sites, where the most favorable ones are the carbon atoms next to Co-coordinated pyridinic N. Interestingly, the cobalt content plays an important role in Co/N-C sites but was not directly involved in the catalytic process. In a Zn-air battery, a small voltage gap without obvious voltage loss is found for the Co/N-CNSNs. This facile approach enables scalable synthesis, representing an essential step toward the popularization of metal-air batteries.
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