| Institution: | 1. Institute of Applied Electrochemistry, Beijing University of Chemical Technology, NO.15 of North Third Ring East Road, Chaoyang District, Beijing, 100029 P. R. China
These authors contributed equally to this work.;2. Institute of Applied Electrochemistry, Beijing University of Chemical Technology, NO.15 of North Third Ring East Road, Chaoyang District, Beijing, 100029 P. R. China;3. National Fundamental Research Laboratory of New Hazardous Chemicals, Beijing University of Chemical Technology, NO.15 of North Third Ring East Road, Chaoyang District, Beijing, 100029 P. R. China;4. Mine Materials Branch of China Coal Research Institute, NO. 5, Qingniangou East Road, Hepingli, Chaoyang District, Beijing, 100013 P. R. China;5. Beijing Key Laboratory for Green Catalysis and Separation, Department of Environmental and Chemical Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100124 P. R. China |
| Abstract: | It is a great challenge to fabricate highly efficient pH-universal electrocatalysts for oxygen reduction reaction (ORR). Herein, a facile strategy, which includes coating the Fe modified ZIF8 on Cu foil and in situ pyrolysis to evaporate and dope Cu into the MOF derived carbon, is developed to fabricate Fe/Cu?N co-doped carbon material (Cu/Fe?NC). Profiting from the modulated electron distribution and textual properties, well-designed Cu/Fe?NC exhibits superior half-wave potential (E1/2) of 0.923 V in alkaline, 0.757 V in neutral and comparable 0.801 V in acid electrolytes, respectively. Furthermore, the ultralow peroxides yield of ORR demonstrates the high selectivity of Cu/Fe?NC in full pH scale electrolytes. As expected, the self-made alkaline and neutral zinc-air batteries equipped with Cu/Fe?NC cathode display excellent discharge voltages, outstanding peak power densities and remarkable stability. This work opens a new way to fabricate highly efficient and pH-universal electrocatalysts for ORR through strategy of Fe/Cu?N co-doping, Cu foil evaporation and carbon defects capture. |
