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Novel cobalt-doped molybdenum oxynitride quantum dot@N-doped carbon nanosheets with abundant oxygen vacancies for long-life rechargeable zinc–air batteries.
- Source :
- Journal of Materials Chemistry A; 4/14/2021, Vol. 9 Issue 14, p9092-9104, 13p
- Publication Year :
- 2021
-
Abstract
- Rechargeable zinc–air batteries (ZABs) have emerged as promising alternatives for conventional Li-ion batteries due to their high energy density and low manufacturing cost. However, Pt/C and RuO<subscript>2</subscript>-based conventional rechargeable ZABs are mainly constrained by the sluggish kinetics of oxygen reduction/oxygen evolution reactions (ORR/OER), limiting commercialization possibilities. Herein, a new type of oxygen vacancies enriched cobalt-doped molybdenum oxynitride quantum dot-anchored N-doped carbon nanosheets (V<subscript>O</subscript>-CMON@NCNs) was demonstrated as an advanced air-cathode for long-life rechargeable ZABs. Such V<subscript>O</subscript>-CMON@NCN catalyst has an exceptional ORR performance with a high half-wave potential of 0.857 V and tremendous OER performance with an ultrasmall overpotential of 240 mV at a current density of 10 mA cm<superscript>−2</superscript>, outperforming conventional Pt/C and RuO<subscript>2</subscript> catalysts. As proof of concept, rechargeable ZABs with an optimal V<subscript>O</subscript>-CMON@NCN-800 air-cathode showed an ultrahigh specific capacity of 721.2 mA h g<subscript>Zn</subscript><superscript>−1</superscript> at a current density of 5 mA cm<superscript>−2</superscript>, a tremendous peak power density of 143.7 mW cm<superscript>−2</superscript>, and ultralong cycling life of 500 h. These consequences suggest that the oxygen vacancies enriched V<subscript>O</subscript>-CMON@NCN can serve as promising bifunctional catalysts for next-generation metal–air batteries and other energy-related applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 9
- Issue :
- 14
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 149805165
- Full Text :
- https://doi.org/10.1039/d0ta12414a