A metal-free ORR/OER bifunctional electrocatalyst derived from metal-organic frameworks for rechargeable Zn-Air batteries

Rechargeable Zn-air batteries are under intensive studies because of their high-energy density, low cost, and safety. However, their wide application is prevented by several remaining technical issues, one of which is the lack of suitable bifunctional cathodic catalysts for oxygen reduction reaction...

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Bibliographic Details
Published in:Carbon (New York) 2017-01, Vol.111, p.641-650
Main Authors: Qian, Yuhong, Hu, Zhigang, Ge, Xiaoming, Yang, Shiliu, Peng, Yongwu, Kang, Zixi, Liu, Zhaolin, Lee, Jim Yang, Zhao, Dan
Format: Article
Language:English
Subjects:
Boron
Carbon
Catalysis
Catalytic activity
Charging
Crystal structure
Discharge
Doping
Electrocatalysts
Flux density
Low cost
Metal air batteries
Metal-organic frameworks
Nitrogen
Porous materials
Pyrolysis
Rechargeable batteries
Reduction (metal working)
Surface area
Synthesis
Zinc-oxygen batteries
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Summary:Rechargeable Zn-air batteries are under intensive studies because of their high-energy density, low cost, and safety. However, their wide application is prevented by several remaining technical issues, one of which is the lack of suitable bifunctional cathodic catalysts for oxygen reduction reaction (ORR) during discharging and oxygen evolution reaction (OER) during charging. Due to low material cost and wide distribution, carbon-based materials may serve as promising electrocatalysts, while doping heteroatoms such as nitrogen or boron can effectively enhance their catalytic activity. Herein, we pyrolyze a metal-organic framework containing Zn, N, and B as the precursor to synthesize dual-doped and metal-free porous carbon materials as efficient ORR/OER bifunctional electrocatalysts. The surface area of obtained carbon materials can be greatly enhanced by pyrolysis under H2-containing atmosphere. In addition, N and B are evenly distributed within the carbon materials due to the crystalline MOF precursor. The resultant carbon materials exhibit high ORR and OER catalytic activities in both half-cell and single-cell battery measurements. Our study has demonstrated for the first time that MOFs can be used as precursors to synthesize metal-free ORR/OER bifunctional cathodic electrocatalysts with great potential in rechargeable Zn-air batteries.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2016.10.046