Effect of doping order on metal-free heteroatoms dual-doped carbon as oxygen reduction electrocatalyst
a School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
b Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
c Department of Chemical Engineering, Shanghai Jiaotong University, Shanghai 200240, China
d Department of Chemical Engineering, Waterloo Institute for Nanotechnology (WIN), University of Waterloo, Waterloo, Ontario N2L3G1, Canada
e Jiangxi Key Laboratory of Power Battery and Material, Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China
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