Journal
JOURNAL OF POWER SOURCES
Volume 482, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228955
Keywords
Carbon nanofibers; FeS2-CoS2; Atomic layer deposition; Bifunctional electrocatalyst; Zn-air batteries
Funding
- National Natural Science Foundation of China [21975229]
- Natural Science Foundation of Zhejiang Province [LY19E020001, LY19B060003]
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The FeS2-CoS2/NCFs integrated electrocatalyst shows high bifunctional activity and durability in alkaline medium, outperforming precious metal-based zinc-air batteries. It also demonstrates practical potentials in flexible solid-state zinc-air batteries, powering LED panels even under twisting state.
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 FeS2-CoS2 (FeS2-CoS2/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 FeS2-CoS2 heterointerface, the FeS2-CoS2/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 FeS2-CoS2/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 FeS2-CoS2/NCFs electrode can stably power LED panels even under twisting state, demonstrating practical potentials in wearable and portable electrochemical devices.
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