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Kim, Kwang S.
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dc.citation.startPage 132623 -
dc.citation.volume 430 - Meena, Abhishek - Thangavel, Pandiarajan - Nissimagoudar, Arun S. - Singh, Aditya Narayan - Jana, Atanu - Jeong, Da Sol - Im, Hyunsik - Kim, Kwang S. - 2023-12-21T14:37:22Z - 2023-12-21T14:37:22Z - 2023-03-02 - 2022-02 -
dc.description.abstract Large scale, cost-efficient, durable, and non-noble metal catalysts for overall water splitting in alkaline-anionexchange-membrane-water-electrolyzer (AAEMWE) are highly demanded for the clean hydrogen economy. Meanwhile, V- and Co-based bimetallic oxide materials were rarely reported for overall water splitting in AAEMWE. Herein, we demonstrate that the self-supported oxovanadate-doped cobalt carbonate (VCoCOx@NF) on nickel foam (NF) is a high-performance overall water-splitting catalyst in AAEMWE. The as-prepared VCoCOx@NF catalyst demonstrates high activity for both hydrogen and oxygen evolution reactions (HER and OER) in alkaline media, with a current density (j) of 10 mA cm-2 at overpotentials of 63 mV and 240 mV, respectively. Assembled as a conventional electrolyzer for overall water splitting, VCoCOx@NF as both anode and cathode in 1 M KOH operates at low cell voltages of 1.54 and 1.74 V at 10 and 100 mA cm-2, respectively, superior to the Ir/ C-Pt/C@NF electrolyzer (1.59 and 1.86 V, respectively). First principle calculations show that the remarkable HER and OER at the Co site are due to the doping of V species, which reduces the overpotential by shifting the delectron states of Co towards the Fermi-level. Besides, an AAEMWE cell fabricated with the VCoCOx@NF catalyst delivers j = 200 mA cm-2 at 2.01 V in deionized water, lower than the expensive commercial IrOx-Pt/C@Au/Ti electrolyzer (2.06 V). This finding provides the stage for large-scale hydrogen production by utilizing the V- and Co-based bimetallic oxide materials. -
dc.identifier.bibliographicCitation CHEMICAL ENGINEERING JOURNAL, v.430, pp.132623 -
dc.identifier.doi 10.1016/j.cej.2021.132623 -
dc.identifier.issn 1385-8947 -
dc.identifier.scopusid 2-s2.0-85116722258 -
dc.identifier.uri -
dc.identifier.wosid 000724712700001 -
dc.language 영어 -
dc.publisher ELSEVIER SCIENCE SA -
dc.title Bifunctional oxovanadate doped cobalt carbonate for high-efficient overall water splitting in alkaline-anion-exchange-membrane water-electrolyzer -
dc.type Article -
dc.description.isOpenAccess FALSE -
dc.relation.journalWebOfScienceCategory Engineering, Environmental; Engineering, Chemical -
dc.relation.journalResearchArea Engineering -
dc.type.docType Article -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.subject.keywordAuthor Oxygen evolution reaction -
dc.subject.keywordAuthor Hydrogen evolution reaction -
dc.subject.keywordAuthor Overall water splitting -
dc.subject.keywordAuthor Water-electrolyzer -
dc.subject.keywordAuthor Electrocatalysts -
dc.subject.keywordPlus HYDROGEN EVOLUTION -
dc.subject.keywordPlus ENERGY-STORAGE -
dc.subject.keywordPlus PH-UNIVERSAL -
dc.subject.keywordPlus VANADIUM -
dc.subject.keywordPlus NICKEL -
dc.subject.keywordPlus OXIDE -
dc.subject.keywordPlus PERFORMANCE -
dc.subject.keywordPlus CATALYSTS -
dc.subject.keywordPlus V2O5 -


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