Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 42, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202103360
Keywords
bifunctional oxygen electrocatalyst; dual-phasic carbon; nanosized phase; rechargeable Zn-air batteries; single-atom phase
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Funding
- Kunming University of Science and Technology
- Guangdong Basic and Applied Basic Research Foundation [2020A1515011044]
- Department of Science and Technology of Guangdong Province [2019A050510043]
- China Postdoctoral Science Foundation [2019M652843]
- National Natural Science Foundation of China [51625203]
- Shenzhen Science and Technology Innovation Committee [JCYJ20180507183818040]
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This research introduces a dual-phasic carbon nanoarchitecture for boosting the reaction rates of ORR and OER by combining single-atom and nanosized phases, resulting in a bifunctional catalyst with high activity and durability. The ZAB based on this catalyst demonstrates excellent power density and cycling stability.
The great interest in rechargeable Zn-air batteries (ZABs) arouses extensive research on low-cost, high-active, and durable bifunctional electrocatalysts to boost the sluggish oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). It remains a great challenge to simultaneously host high-active and independent ORR and OER sites in a single catalyst. Herein a dual-phasic carbon nanoarchitecture consisting of a single-atom phase for the ORR and nanosized phase for the OER is proposed. Specifically, single Co atoms supported on carbon nanotubes (single-atom phase) and nanosized Co encapsulated in zeolitic-imidazole-framework-derived carbon polyhedron (nanosized phase) are integrated together via carbon nanotube bridges. The obtained dual-phasic carbon catalyst shows a small overpotential difference of 0.74 V between OER potential at 10 mA cm(-2) and ORR half-wave potential. The ZAB based on the bifunctional catalyst demonstrates a large power density of 172 mW cm(-2). Furthermore, it shows a small charge-discharge potential gap of 0.51 V at 5 mA cm(-2) and outstanding discharge-charge cycling durability. This study provides a feasible design concept to achieve multifunctional catalysts and promotes the development of rechargeable ZABs.
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