Journal
JOURNAL OF POWER SOURCES
Volume 475, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228594
Keywords
CoFe alloyed nanocrystals; Bifunctional electrocatalyst; Oxygen reduction reaction; Oxygen evolution reaction; Zn-air battery
Funding
- Zhejiang Public Welfare Technology Application Research Project [LGG19B050001, LGG18E010001]
- National Natural Science Foundation of China [21805245]
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Exploring efficient, cost-effectiveness and stable bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is critical for rechargeable metal-air batteries. Herein, CoFe alloyed nanocrystals encapsulated in N, P-codoped carbon nanovesicles assembled hollow spheres (CoFe@NP-CHS) are prepared by pyrolyzing the homogenous mixture of vitamin B12 (VB12), melamine and Fe2O3 at 700 degrees C. The resultant CoFe@NP-CHS demonstrates distinct activity for ORR and OER in the alkaline media. More impressively, the as-developed Zn-air battery displays excellent performance with enhanced open-circuit voltage of 1.516 V, enlarged peak power density of 123.1 mW cm(-2), and remarkable cycling stability at 10 mA cm(-2) (40 h), outperforming the mixture of commercial Pt/C + RuO2 catalysts. This work provides a promising avenue to fabricate efficient, low cost and stable electrocatalyst for practical viability in electrochemical energy devices.
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