Water oxidation electrocatalysis with a cobalt ‐ borate ‐ based hybrid system under neutral conditions

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buir.contributor.authorTurhan, Emine A.
buir.contributor.authorNune, Satya Vijaya Kumar
buir.contributor.authorKaradaş, Ferdi
dc.citation.epage10382en_US
dc.citation.issueNumber41en_US
dc.citation.spage10372en_US
dc.citation.volumeNumber24en_US
dc.contributor.authorTurhan, Emine A.en_US
dc.contributor.authorNune, Satya Vijaya Kumaren_US
dc.contributor.authorÜlker, E.en_US
dc.contributor.authorŞahin, U.en_US
dc.contributor.authorDede, Y.en_US
dc.contributor.authorKaradaş, Ferdien_US
dc.date.accessioned2019-02-21T16:01:22Zen_US
dc.date.available2019-02-21T16:01:22Zen_US
dc.date.issued2018en_US
dc.departmentDepartment of Chemistryen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractThe development of new water oxidation electrocatalysts that are both stable and efficient, particularly in neutral conditions, holds great promise for overall water splitting. In this study, the electrocatalytic water oxidation performance of a new cobalt-based catalyst, Co3(BO3)2, with a Kotoite-type crystal structure is investigated under neutral conditions. The catalyst is also hybridized with CNTs to enhance its electrocatalytic properties. A remarkable increase in catalytic current along with a significant shift in the onset overpotential is observed in Co3(BO3)2@CNT. Additionally, CNT addition also greatly influences the surface concentration of the catalyst: 12.7 nmol cm−2 for Co3(BO3)2@CNT compared with 3.9 nmol cm−2 for Co3(BO3)2. Co3(BO3)2@CNT demands overpotentials of 303 and 487 mV to attain current densities of 1 and 10 mA cm−2, respectively, at pH 7. Electrochemical and characterization studies performed over varying pH conditions reveal that the catalyst retains its stability over a pH range of 3-14. Multi-reference quantum chemical calculations are performed to study the nature of the active cobalt sites and the effect of boron atoms on the activity of the cobalt ions.en_US
dc.description.sponsorshipThe authors thank the Science and Technology Council of Turkey, TUBITAK (Project No: 214Z095) for financial support. E.U. thanks TUBITAK for support (Project No: 1929B011500059). Y.D. thanks BAGEP and TÜBA-GEBİP for young investigator awards and ECOSTBio (CM 1305) for support. TUBITAK TRGRID infrastructure is gratefully acknowledged for HPC resources.en_US
dc.embargo.release2019-07-20en_US
dc.identifier.doi10.1002/chem.201801412en_US
dc.identifier.eissn1521-3765
dc.identifier.issn0947-6539en_US
dc.identifier.urihttp://hdl.handle.net/11693/49829en_US
dc.language.isoEnglishen_US
dc.publisherWiley-VCH Verlagen_US
dc.relation.isversionofhttps://doi.org/10.1002/chem.201801412en_US
dc.relation.projectCM 1305 - Beijing Council of Science and Technology - 1929B011500059 - 214Z095en_US
dc.source.titleChemistry: A European Journalen_US
dc.subjectBorateen_US
dc.subjectCobalten_US
dc.subjectDensity functional calculationsen_US
dc.subjectElectrocatalysisen_US
dc.subjectWater oxidationen_US
dc.titleWater oxidation electrocatalysis with a cobalt ‐ borate ‐ based hybrid system under neutral conditionsen_US
dc.typeArticleen_US

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