Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 20, Pages 9716-9722Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta01859f
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Funding
- Ph.D. Candidate Research Innovation Fund of Nankai University
- Tianjin Municipal Science and Technology Commission [16PTSYJC00010, 17JCQNJC06400]
- NSFC of China [21421001]
- [2017M611153]
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Exploration of cost-effective electrocatalysts that could replace noble metals to promote the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) holds great potential for large-scale applications in energy storage devices such as metal-air batteries. Metal-organic frameworks (MOFs) provide a new route to design highly active catalysts owing to their adjustable composition, morphology and surface area. Herein, a highly efficient bifunctional catalyst was fabricated by forming an interconnected and conducting Co-N/C framework on bamboo-like hollow MnO nanowires. The hybrid demonstrates prominent ORR/OER activity and promising potential in rechargeable Zn-air batteries. Especially, when assembled into solid-state Zn-air batteries, high open-circuit potential and stable discharge-charge cycling platforms were achieved. The outstanding performances stem from the synergistic effect of the two composites in one-dimensional nanowires, facilitating the convenient and sustainable diffusion of electrolytes to active sites. This work provides a new guideline to optimize MOF-derived materials as substitutes for Pt/C and RuO2 noble-metal catalysts for air cathodes in both liquid- and solid-state Zn-air batteries.
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