Atomically Embedded Ag via Electrodiffusion Boosts Oxygen Evolution of CoOOH Nanosheet Arrays

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Layered cobalt (oxy)hydroxides have received much attention as cost-effective and efficient catalysts for the oxygen evolution reaction (OER) for electrochemical water splitting. Doping with guest cations possessing different oxidation states such as Ag can change the chemistry of conventional transition metal oxides and hydroxides, generating unexpected electrocatalytic performances. However, Ag dopants have been found to easily segregate at the surface of electrocatalysts, which induces deactivation. Here, we fabricated Ag-doped CoOOH nanosheet arrays using electrochemical deposition, followed by a simple electrochemical diffusion approach. Surprisingly, we revealed, through atom probe tomography (APT), secondary ion mass spectroscopy (SIMS), and energy-dispersive spectroscopy (EDS) that Ag atoms are homogeneously distributed without any detectable segregation. The Ag-doped CoOOH exhibits enhanced OER performance in terms of overpotential, both experimentally (256 mV) and theoretically (60 mV). The homogeneously distributed Ag dopants facilitate the phase transformation from Co(OH)
Publisher
AMER CHEMICAL SOC
Issue Date
2020-01
Language
English
Article Type
Article
Citation

ACS CATALYSIS, v.10, no.1, pp.562 - 569

ISSN
2155-5435
DOI
10.1021/acscatal.9b02249
URI
http://hdl.handle.net/10203/271836
Appears in Collection
MS-Journal Papers(저널논문)
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