Bifunctional CoO/CoS2 hierarchical nanospheres electrocatalyst for rechargeable Zn-Air battery
[Display omitted] •An effective bifunctional CoO/CoS2 hierarchical nanospheres electrocatalysts were successfully prepared.•As the cathode of the Zn-Air batteries, CoO/CoS2 displayed excellent activities for both OER and ORR.•The enhanced electrocatalytic activity can be assigned to boundary interac...
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Published in | FlatChem Vol. 32; p. 100343 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.03.2022
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Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
•An effective bifunctional CoO/CoS2 hierarchical nanospheres electrocatalysts were successfully prepared.•As the cathode of the Zn-Air batteries, CoO/CoS2 displayed excellent activities for both OER and ORR.•The enhanced electrocatalytic activity can be assigned to boundary interaction between CoO and CoS2 of the heterojunction and the in situ generated O vacancy.
Limited by sluggish kinetics of oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), exploring low-cost nonprecious materials to replace precious catalysts is urgently desired for the commercialization of efficient rechargeable Zn-air batteries. Herein, a rationally designed oxide/sulfide heterostructures, which named as CoO/CoS2, are successfully realized. Benefited from the electrons interaction between multiple components at the heterojunction interface and the defect structure, the CoO/CoS2 displays highly effective bifunctional catalytic performance and robust durability. CoO/CoS2 expresses a truncated overpotential of 320 mV at 10 mA cm−1 for OER, a half-wave potential of 0.78 V for ORR, and a potential difference of approximately 0.78 V. For practical application, the assembled aqueous Zn-air battery with CoO/CoS2 as the air cathode displays a large open-circuit voltage of 1.40 V, a high power density (84 mW cm−2) and superb charge–discharge stability. This work illustrates the great application prospects of CoO/CoS2 as a next-generation power source device. |
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ISSN: | 2452-2627 2452-2627 |
DOI: | 10.1016/j.flatc.2022.100343 |