期刊
CHINESE JOURNAL OF CHEMISTRY
卷 39, 期 3, 页码 655-660出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.202000445
关键词
Graphene; Heterogeneous catalysis; Electrochemistry; Oxygen evolution reaction; Oxygen reduction reaction
资金
- National Natural Science Foundation of China [51822106, 51572188]
In this study, a hybrid bifunctional oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) NiCo2O4-x/NLG catalyst was successfully synthesized via a combination of the hydrothermal method and pulsed laser irradiation. The catalyst showed enhanced intrinsic OER and ORR activities attributed to a synergistic effect between the pyridinic-N-Co coordination and the oxygen vacancies. The overall ORR/OER overpotential of NiCo2O4-x/NLG was found to be superior to commercial noble-metal-based catalysts, making it a promising design strategy for enhancing the intrinsic activity of bifunctional ORR/OER electrocatalysts.
Main observation and conclusion A hybrid bifunctional oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) NiCo2O4-x/NLG with rich pyridinic-nitrogen- cobalt coordination and oxygen vacancies was synthesized via a combination of the hydrothermal method and pulsed laser irradiation. NiCo2O4-x/NLG exhibits an excellent catalytic activity with a low overpotential of 290 mV at 10 mA center dot cm(-2) for OER and a high half-wave potential of 0.85 V for ORR. As a result, the overall ORR/OER overpotential of NiCo2O4-x/NLG is only 0.67 V in 1.0 mol/L KOH electrolyte, which is superior to commercial noble-metal-based catalysts (Pt/C+RuO2). It is evidenced that the enhanced intrinsic OER and ORR activities of NiCo2O4-x/NLG are attributed to a synergistic effect between the pyridinic-N-Co coordination and the oxygen vacancies. This work provides a new design strategy for enhancing the intrinsic activity of bifunctional ORR/OER electrocatalysts.
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