dc.contributor.authorWang, Jiong
dc.contributor.authorGe, Xiaoming
dc.contributor.authorLiu, Zhaolin
dc.contributor.authorThia, Larissa
dc.contributor.authorYan, Ya
dc.contributor.authorXiao, Wei
dc.contributor.authorWang, Xin
dc.identifier.citationWang, J., Ge, X., Liu, Z., Thia, L., Yan, Y., Xiao, W., et al. (2017). Heterogeneous Electrocatalyst with Molecular Cobalt Ions Serving as the Center of Active Sites. Journal of the American Chemical Society, 139(5), 1878-1884.en_US
dc.description.abstractMolecular Co2+ ions were grafted onto doped graphene in a coordination environment, resulting in the formation of molecularly well-defined, highly active electrocatalytic sites at a heterogeneous interface for the oxygen evolution reaction (OER). The S dopants of graphene are suggested to be one of the binding sites and to be responsible for improving the intrinsic activity of the Co sites. The turnover frequency of such Co sites is greater than that of many Co-based nanostructures and IrO2 catalysts. Through a series of carefully designed experiments, the pathway for the evolution of the Co cation-based molecular catalyst for the OER was further demonstrated on such a single Co-ion site for the first time. The Co2+ ions were successively oxidized to Co3+ and Co4+ states prior to the OER. The sequential oxidation was coupled with the transfer of different numbers of protons/hydroxides and generated an active Co4+═O fragment. A side-on hydroperoxo ligand of the Co4+ site is proposed as a key intermediate for the formation of dioxygen.en_US
dc.description.sponsorshipNRF (Natl Research Foundation, S’pore)en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.format.extent15 p.en_US
dc.relation.ispartofseriesJournal of the American Chemical Societyen_US
dc.rights© 2017 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of the American Chemical Society, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1021/jacs.6b10307].en_US
dc.subjectOxygen evolution reactionen_US
dc.titleHeterogeneous Electrocatalyst with Molecular Cobalt Ions Serving as the Center of Active Sitesen_US
dc.typeJournal Article
dc.contributor.researchCentre for Programmable Materialsen_US
dc.contributor.schoolSchool of Chemical and Biomedical Engineeringen_US
dc.description.versionAccepted versionen_US

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