Journal
ADVANCED ENERGY MATERIALS
Volume 12, Issue 48, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202202984
Keywords
NiCo; oxygen evolution; oxygen reduction; single-atom catalysts; zinc-air batteries
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Funding
- National Natural Science Foundation of China [52102046]
- Applied Basic Research Program of Yunnan Province [202201AU070113]
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This study proposes a carbon nanotube-bridging strategy to synthesize a highly efficient oxygen electrocatalyst for the development of high-performance and long-life rechargeable zinc-air batteries. The results show that the developed catalyst exhibits good electrochemical performance and cycle stability.
The development of highly efficient and robust bifunctional electrocatalysts for oxygen reduction (ORR) and evolution reactions (OER) is the key issue for realizing high-performance and long-life rechargeable zinc-air batteries (ZABs). However, it is still a great challenge to integrate independent ORR and OER sites in a catalyst with high activity. Here, a carbon nanotube-bridging strategy is proposed to synthesize such a bifunctional oxygen electrocatalyst enriched with highly active single-atom Fe sites for the ORR and high-performance nanosized NiCo hydroxides for the OER. Consequently, the developed catalyst shows a small overpotential difference of 0.686 V. When used as an oxygen electrode catalyst, the corresponding ZAB exhibits a large power density of 219.5 mW cm(-2), a small charge-discharge voltage gap of 0.72 V at 10 mA cm(-2), and outstanding discharge-charge durability without attenuation after more than 700 cycles. This work proposes a new idea to realize multifunctional catalysts and drives the practical application of ZABs.
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