【摘 要】
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A hybrid bifunctional oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) NiCo2O4-x/NLG with rich pyridinic-nitrogencobalt coordination and oxygen v
【机 构】
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School of Materials Science and Engineering, Institute of New-Energy Materials, Tianjin University,
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A hybrid bifunctional oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) NiCo2O4-x/NLG with rich pyridinic-nitrogencobalt 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.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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