FeS 2 –CoS 2 incorporated into nitrogen-doped carbon nanofibers to boost oxygen electrocatalysis for durable rechargeable Zn-air batteries
Journal of Power Sources, ISSN: 0378-7753, Vol: 482, Page: 228955
2021
- 84Citations
- 20Captures
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Article Description
Developing transition-metal based bifunctional electrocatalysts to efficiently drive oxygen evolution reaction and oxygen reduction reaction is an urgent demand for the implementation of rechargeable Zn-air batteries. Transition-metal sulfides are emerging as alternatives to precious metal-based electrocatalysts, however, their bifunctional activities are usually restricted by inferior electrical conductivities and limited electrochemical active sites. Herein, we highlight a novel metal-organic frameworks derived nitrogen-doped carbon nanofiber coupled FeS 2 –CoS 2 (FeS 2 –CoS 2 /NCFs) by a combination of electrospinning and atomic-layer-deposition approach. Benefiting from the large exposed surface active sites of hierarchical structure and the abundant interfacial vacancies in FeS 2 –CoS 2 heterointerface, the FeS 2 –CoS 2 /NCFs integrated electrocatalyst delivers a high bifunctional activity together with a good durability in alkaline medium. Notably, the liquid Zn-air battery assembled with this FeS 2 –CoS 2 /NCFs electrode displays a considerable peak power density of 257 mW cm −2, a high specific capacity of 814 mA h g −1 and a long cycling life of 250 h, superior to precious metal based Zn-air batteries. Moreover, the flexible solid-state Zn-air battery using such FeS 2 –CoS 2 /NCFs electrode can stably power LED panels even under twisting state, demonstrating practical potentials in wearable and portable electrochemical devices.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0378775320312544; http://dx.doi.org/10.1016/j.jpowsour.2020.228955; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85091076928&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0378775320312544; https://dx.doi.org/10.1016/j.jpowsour.2020.228955
Elsevier BV
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