Atomic metal vacancy modulation of single-atom dispersed Co/N/C for highly efficient and stable air cathode

ACS Applied Materials & Interfaces
Sisi LiuTao Qian

Abstract

Metal-air batteries have received great attention as new energy supply for next generation electronic devices. However, their widespread application is still hindered by several challenges including sluggish kinetics of the cathodic reactions and undesirable stability of the air cathode due to possible deposition of discharge product. Herein, we propose an atomic metal vacancy modulation of single-atom dispersed Co/N/C cathode to provide zinc-air battery with both reduced overpotential and enhanced stability. As illustrated by theoretical calculations and electrochemical measurements, deliberate introduction of metal vacancies would modulate the electronic structure and contribute to enhanced catalytic activity, affording the catalyst with a half-wave potential of 0.89 V versus reversible hydrogen electrode and an overall oxygen electrode potential gap of 0.72 V. Moreover, abundant pyridinic-N groups are exposed due to removal of metal centers, generating strong Lewis basicity to effectively prevent the access of negatively charged zincate ions and realize non-deposition of ZnO on air cathode. Rechargeable zinc-air battery assembled with such air cathode delivers superior cyclic performance with low discharge/charge overpotenti...Continue Reading

References

Jun 10, 2010·Journal of the American Chemical Society·Yi-Chun LuYang Shao-Horn
Jun 14, 2014·Chemical Society Reviews·Yanguang Li, Hongjie Dai
Feb 13, 2015·Physical Chemistry Chemical Physics : PCCP·Bo LiDangsheng Su
Jan 10, 2017·Advanced Materials·Cheng Tang, Qiang Zhang
Jun 6, 2017·ACS Applied Materials & Interfaces·Mengfan WangChenglin Yan
Dec 6, 2018·Advanced Materials·Mengfan WangChenglin Yan
Dec 6, 2019·Journal of the American Chemical Society·Jinqiang ZhangGuoxiu Wang

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