Γ-CD-MOF-derived heterostructures as bifunctional electrocatalysts for rechargeable zinc–air batteries. Issue 7 (13th March 2023)

• Record Type: Journal Article
• Authors: Chai, Ruirui; Sang, Xinxin; Ou, Shiguo; Li, Jiahao; Song, Junling; Wang, Dawei
• Is Part Of: Sustainable energy & fuels. Volume 7:Issue 7(2023)
• Page Start: 1656
• Page End: 1663
• Publication Date: 2023-03-13
• Subjects: Renewable energy sources -- Periodicals; Fuel cells -- Periodicals; Electric batteries -- Periodicals; Electrochemistry -- Periodicals; 660.297
• DOI: 10.1039/d3se00011g
• Languages: English
• ISSNs: 2398-4902

Abstract

Abstract : γ-CD-MOF-derived Co–N, O–C@C3 N4 was designed as efficient bifunctional electrocatalysts for rechargeable zinc–air batteries. Abstract : The development of efficient and cost-effective bifunctional electrocatalysts toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is promising for high-performance rechargeable metal–air batteries. In this work, a Co–N, O–C@C3 N4 heterostructure catalyst is synthesized via molten salt-assisted pyrolysis of a mixture of cobalt loaded γ-cyclodextrin MOFs and melamine. Benefitting from the synergy of Co–N, O–C and C3 N4 in regulating the electrochemical structure, optimized activity is recorded at a current density of 10 mA cm −2 with an overpotential at 290 mV for the OER, and a half-wave potential of 0.84 V for the ORR. Moreover, a rechargeable Zn–air battery with Co–N, O–C@C3 N4 as an air electrode exhibits a large open-circuit voltage (1.43 V) with a high peak power density (112 mW cm −2 ) and long cycle life (over 200 cycles). Therefore, this work provides a new vision for the design and preparation of promising functional electrocatalysts for Zn–air batteries.