Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 18, Pages 15591-15601Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b18684
Keywords
cobalt and manganese oxides; porous carbon; bifunctional electrodes; liquid-type; flexible all-solid-state; zinc-air batteries
Funding
- National Natural Science Foundation of China [U1510120, U1510204, 91645110, 51672291, 51172251]
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University
- Hundred Talents Program of Chinese Acedamy of Sciences
- Shanxi Province Coal-based Key Scientific and Technological Project [MD2014-09]
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The design of efficient, durable, and affordable catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is very indispensable in liquid-type and flexible all-solid-state zinc-air batteries. Herein, we present a high-performance bifunctional catalyst with cobalt and manganese oxides supported on porous carbon (Co3O4/MnO2/PQ-7). The optimized Co3O4/MnO2/PQ-7 exhibited a comparable ORR performance with commercial Pt/C and a more superior OER performance than all of the other prepared catalysts, including commercial Pt/C. When applied to practical aqueous (6.0 M KOH) zinc-air batteries, the Co3O4/MnO2/porous carbon hybrid catalysts exhibited exceptional performance, such as a maximum discharge peak power density as high as 257 mW cm(-2) and the most stable charge-discharge durability over 50 h with negligible deactivation to date. More importantly, a series of flexible all-solid-state zinc-air batteries can be fabricated by the Co3O4/MnO2/porous carbon with a layer-by-layer method. The optimal catalyst (Co3O4/MnO2/PQ-7) exhibited an excellent peak power density of 45 mW cm(-2). The discharge potentials almost remained unchanged for 6 h at 5 mA cm(-2) and possessed a long cycle life (2.5 h@5 mA cm(-2)). These results make the optimized Co3O4/MnO2/PQ-7 a promising cathode candidate for both liquid-type and flexible all-solid-state zinc-air batteries.
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