Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 12, Pages 14235-14242Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c00455
Keywords
bimetallic sulfides; oxygen evolution reaction; electrocatalysis; in situ Raman; surface reconstruction
Funding
- National Natural Science Foundation of China [21871065, 22071038]
- China Postdoctoral Science Foundation [2020M670894, HITTY-20190033]
- Interdisciplinary Research Foundation of Harbin Institute of Technology [IR2021205]
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In this study, zinc-doped CoS2 nanoarrays supported on carbon cloth were synthesized through sulfidization of metal-organic frameworks. The resulting Co(Zn)S-2/CC precatalyst showed excellent catalytic activity and long-term durability in the oxygen evolution reaction. The study also revealed the impact of zinc doping on the electronic structure of Co species and intermediates adsorption.
Development of low-cost, efficient, and durable electrocatalysts for the oxygen evolution reaction (OER) is crucial for multiple energy conversions and storage devices. Herein, Zn-doped CoS2 nanoarrays supported on carbon cloth, Co(Zn)S-2/CC, are fabricated through a facile sulfidization of CoZn metal-organic frameworks. This precatalyst, Co(Zn)S-2/CC, with a well-defined nanoarray structure affords excellent OER catalytic activity (eta = 248 mV at 10 mA/cm(2)) and long-term durability in 1 M KOH. X-ray photoelectron and in situ Raman spectroscopic studies indicate that Co(Zn)S-2 undergoes surface reconstruction with the generation of Co(Zn)OOH adsorbed with SO42- at the surface during the OER process. The Zn dopant is calculated to impact on the electronic structure of Co species and further the adsorption of intermediates. This work not only provides a novel method for the synthesis of bimetallic sulfides but also gives insights into the doping effect on the OER performance of transition metal sulfides.
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