期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 265, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118603
关键词
Metal-free bifunctional electrocatalyst; Rechargeable Zn-air batteries; Template-activator cooperation; Hierarchical porous carbon; N, O-doping
资金
- National Nature Science Foundation of China [51874360, 51704332, 51674295, 51674296]
- Postdoctoral Science Foundation of China [BX201700290, 2018M630911]
- Program of Huxiang Young Talents [2019RS2002]
Nonprecious bifunctional electrocatalysts with satisfactory cost and high catalytic performance toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are essential to promote the commercialization of metal-air batteries. Herein, 3D honeycombed hierarchical porous N, O-doping carbon (HHPC) is fabricated via a facile and scalable strategy of hard template-activator assisted pyrolysis. The obtained HHPC displays unique macro-meso-microporous framework, N, O-codoped effect and order-disorder hybrid characteristic, providing sufficient space for O-2 and electrolyte transport, abundant defect sites, enhanced electronic conductivity and stability for oxygen conversion reaction. As such, the HHPC exhibits superior bifunctional electrocatalytic activity with a narrow Delta E value of 0.8 V. And a long-term stability and reversibility with a narrow voltage gap increasing of 0.09 V over 1165 cycles (similar to 388 h) at 10 mA cm(-2) are achieved in the HHPC-based rechargeable Zn-air battery, outperforming most of the state-of-the-art carbon-based Zn-air batteries.
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