An Active Hybrid Electrocatalyst with Synergized Pyridinic Nitrogen-Cobalt and Oxygen Vacancies for Bifunctional Oxygen Reduction and Evolution

• 作者: Wen-Xin Zhong Xue-Ru Zhao Jia-Yi Qin Jing Yang
• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Concise Reports
• 页码范围: 655-660
• 页数: 6页
• 语种: 英文
• DOI: 10.1002/cjoc.202000445

摘要

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.