Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 13, Issue 29, Pages 6743-6748Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c01687
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Funding
- Energy Education Trust of New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Royal Society Te Aparangi (James Cook Research Fellowship)
- National Natural Science Foundation of China [52103354, 51874359]
- Central South University [202045020]
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In this study, high-performance bifunctional ORR/OER electrocatalysts were synthesized by encapsulating CoNi alloy nanoparticles with N-doped few-layer graphene. The developed CoNi/N-FLG catalyst exhibited excellent oxygen reduction activity and outstanding oxygen evolution activity, enabling efficient oxygen electrocatalysis and stability in prototype rechargeable zinc-air batteries.
The discovery of highly efficient, durable, and affordable bifunctional ORR/ OER electrocatalysts is of great significance for the commercialization of rechargeable metal-air batteries. Herein, we synthesized uniformly sized CoNi alloy nanoparticles encapsulated with N-doped few-layer graphene (N-FLG) sheets via pyrolysis of a CoNi dual metal-organic framework precursor. The developed CoNi/N-FLG catalyst exhibited excellent oxygen reduction activity (comparable to a commercial 20 wt % Pt/C catalyst) and outstanding oxygen evolution activity (superior to a commercial 20 wt % IrO2/C catalyst), thus enabling efficient bifunctional oxygen electrocatalysis and stability when applied in prototype rechargeable zinc-air batteries. The remarkable electrochemical properties of CoNi/N-FLG originate from its unique core-shell structure and favorable electron penetration effects, thereby optimizing the adsorption/desorption strengths of intermediates formed during the oxygen reduction and oxygen evolution reactions.
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