期刊
JOURNAL OF POWER SOURCES
卷 431, 期 -, 页码 265-273出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.126650
关键词
Density functional theory; Nitrogen-doped graphene; Oxygen reduction reaction; Scandium; Single-atom catalysis
资金
- Natural Science Foundation of Jilin Province [20180101291JC]
Rational design of highly active and durable electrocatalysts for oxygen reduction reaction is critical to substitute precious metal platinum for fuel cells. Herein, a novel non-precious atomic scandium embedded into nitrogen-doped graphene material is successfully synthesized via a facile annealing method. The catalyst exhibits superior oxygen reduction reaction performance in both 0.1 M KOH and 0.5 M H2SO4, with onset potential (E-onset, 0.99 vs 0.82 V) and half-wave potential (E-1/2, 0.89 vs 0.72 V). Theoretical calculations reveal that the possible active sites for ORR might be ScN(3)O( )and ScN2O embedded into the N-doped graphene. The outstanding electrochemical stability and strong tolerance to methanol crossover on the atomic scandium and nitrogen-codoped graphene make it a promising application in metal-air batteries and fuel cells.
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