Abstract
The reversible oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are proton-coupled/decoupled four-electron reactions requiring multi-type active centers for catalysis. Herein, porous nanosheets codoped with a carbon-encapsulated FeNi alloy, metal-N species, and N defects (FeNi-N/PCN) were synthesized through a facile and environmentally friendly molten NaCl template method. The obtained FeNi-N/PCN achieved impressive performances as an oxygen electrocatalyst for the ORR and OER in alkaline (E1/2 of 0.88 VRHE, Ej=10 of 1.57 VRHE) and acidic electrolytes (E1/2 of 0.78 VRHE, Ej=10 of 1.76 VRHE). Furthermore, this FeNi-N/PCN catalyst achieved an impressive power density of 224 mW cm−2 and a specific capacity of 691 mA h g−1 in a Zn-air battery, which are 1.34- and 1.20-fold higher than that of the Pt and RuO2 catalysts, respectively. These outstanding performances are due to the layered carbon nanosheet with multi-type active sites, including a carbon-encapsulated FeNi alloy, N defects, and metal-N sites (M-Nx).
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