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Mesoporous K-doped NiCo(2)O(4) derived from a Prussian blue analog: high-yielding synthesis and assessment as oxygen evolution reaction catalyst

The conversion and storage of clean renewable energy can be achieved using water splitting. However, water splitting exhibits sluggish kinetics because of the high overpotentials of the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) and should therefore be promoted by OER...

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Detalles Bibliográficos
Autores principales: Kim, Nam Woon, Yu, Hyunung, Oh, Jihun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9037640/
https://www.ncbi.nlm.nih.gov/pubmed/35480370
http://dx.doi.org/10.1039/d2ra01235a
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author Kim, Nam Woon
Yu, Hyunung
Oh, Jihun
author_facet Kim, Nam Woon
Yu, Hyunung
Oh, Jihun
author_sort Kim, Nam Woon
collection PubMed
description The conversion and storage of clean renewable energy can be achieved using water splitting. However, water splitting exhibits sluggish kinetics because of the high overpotentials of the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) and should therefore be promoted by OER and/or HER electrocatalysts. As the kinetic barrier of the former reaction exceeds that of the latter, high-performance OER catalysts are highly sought after. Herein, K-doped NiCo(2)O(4) (HK-NCO) was hydrothermally prepared from a Prussian blue analog with a metal–organic framework structure and assessed as an OER catalyst. Extensive K doping increased the number of active oxygen vacancies and changed their intrinsic properties (e.g., binding energy), thus increasing conductivity. As a result, HK-NCO exhibited a Tafel slope of 49.9 mV dec(−1) and a low overpotential of 292 mV at 10 mA cm(−2), outperforming a commercial OER catalyst (Ir) and thus holding great promise as a component of high-performance electrode materials for metal-oxide batteries and supercapacitors.
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spelling pubmed-90376402022-04-26 Mesoporous K-doped NiCo(2)O(4) derived from a Prussian blue analog: high-yielding synthesis and assessment as oxygen evolution reaction catalyst Kim, Nam Woon Yu, Hyunung Oh, Jihun RSC Adv Chemistry The conversion and storage of clean renewable energy can be achieved using water splitting. However, water splitting exhibits sluggish kinetics because of the high overpotentials of the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) and should therefore be promoted by OER and/or HER electrocatalysts. As the kinetic barrier of the former reaction exceeds that of the latter, high-performance OER catalysts are highly sought after. Herein, K-doped NiCo(2)O(4) (HK-NCO) was hydrothermally prepared from a Prussian blue analog with a metal–organic framework structure and assessed as an OER catalyst. Extensive K doping increased the number of active oxygen vacancies and changed their intrinsic properties (e.g., binding energy), thus increasing conductivity. As a result, HK-NCO exhibited a Tafel slope of 49.9 mV dec(−1) and a low overpotential of 292 mV at 10 mA cm(−2), outperforming a commercial OER catalyst (Ir) and thus holding great promise as a component of high-performance electrode materials for metal-oxide batteries and supercapacitors. The Royal Society of Chemistry 2022-04-25 /pmc/articles/PMC9037640/ /pubmed/35480370 http://dx.doi.org/10.1039/d2ra01235a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Kim, Nam Woon
Yu, Hyunung
Oh, Jihun
Mesoporous K-doped NiCo(2)O(4) derived from a Prussian blue analog: high-yielding synthesis and assessment as oxygen evolution reaction catalyst
title Mesoporous K-doped NiCo(2)O(4) derived from a Prussian blue analog: high-yielding synthesis and assessment as oxygen evolution reaction catalyst
title_full Mesoporous K-doped NiCo(2)O(4) derived from a Prussian blue analog: high-yielding synthesis and assessment as oxygen evolution reaction catalyst
title_fullStr Mesoporous K-doped NiCo(2)O(4) derived from a Prussian blue analog: high-yielding synthesis and assessment as oxygen evolution reaction catalyst
title_full_unstemmed Mesoporous K-doped NiCo(2)O(4) derived from a Prussian blue analog: high-yielding synthesis and assessment as oxygen evolution reaction catalyst
title_short Mesoporous K-doped NiCo(2)O(4) derived from a Prussian blue analog: high-yielding synthesis and assessment as oxygen evolution reaction catalyst
title_sort mesoporous k-doped nico(2)o(4) derived from a prussian blue analog: high-yielding synthesis and assessment as oxygen evolution reaction catalyst
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9037640/
https://www.ncbi.nlm.nih.gov/pubmed/35480370
http://dx.doi.org/10.1039/d2ra01235a
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