Journal
NANOTECHNOLOGY
Volume 32, Issue 27, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6528/abf26f
Keywords
nickel sulfide; atomic layer deposition; Zn− air batteries
Funding
- NSFC [51961165105, 51672011]
- Guangdong Basic and Applied Basic Research Foundation [2020B1515120039]
- Shenzhen Fundamental Research Program [JCYJ20180302150402760, JCYJ20200109110628172]
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This study introduces a novel non-precious NiS(x)/CNT electrocatalyst, which enhances the kinetics of oxygen reduction and oxygen evolution reactions in zinc-air batteries, resulting in improved battery performance.
Rechargeable Zn-air batteries are a promising type of metal-air batteries for high-density energy storage. However, their practical use is limited by the use of costly noble-metal electrocatalysts for the sluggish kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) occurred at the air electrode of the Zn-air batteries. This work reports a new non-precious bifunctional OER/ORR electrocatalyst of NiS (x) /carbon nanotubes (CNTs), which is made by atomic layer deposition (ALD) of nickel sulfide (NiS (x) ) on CNTs, for the applications for the air electrode of the Zn-air batteries. The NiS (x) /CNT electrocatalyst on a carbon cloth electrode exhibits a low OER overpotential of 288 mV to reach 10 mA cm(-2) in current density, and the electrocatalyst on a rotating disk electrode exhibits a half-wave ORR potential of 0.81 V in alkaline electrolyte. With the use of the NiS (x) /CNT electrocatalyst for the air electrode, the fabricated aqueous rechargeable Zn-air batteries show a fairly good maximum output power density of 110 mW cm(-2), which highlights the great promise of the ALD NiS (x) /CNT electrocatalyst for Zn-air batteries.
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