DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lee, Heebin | ko |
dc.contributor.author | Kim, Keon-Han | ko |
dc.contributor.author | Choi, Won Ho | ko |
dc.contributor.author | Moon, Byeong Cheul | ko |
dc.contributor.author | Kong, Hyung Jun | ko |
dc.contributor.author | Kang, Jeung Ku | ko |
dc.date.accessioned | 2019-12-23T07:20:47Z | - |
dc.date.available | 2019-12-23T07:20:47Z | - |
dc.date.created | 2019-12-23 | - |
dc.date.created | 2019-12-23 | - |
dc.date.created | 2019-12-23 | - |
dc.date.issued | 2019-11 | - |
dc.identifier.citation | ACS APPLIED MATERIALS & INTERFACES, v.11, no.47, pp.44366 - 44374 | - |
dc.identifier.issn | 1944-8244 | - |
dc.identifier.uri | http://hdl.handle.net/10203/270289 | - |
dc.description.abstract | A cobalt phosphate (Co-Pi) catalyst having octahedral CoO6 molecular units as reaction sites is a key component in photoelectrochemical (PEC) water oxidation systems, but its limited adsorption sites for oxygen evolving intermediates (*OH, *OOH), slow charge transfer rates, and fast degradation of reaction sites are yet to be overcome. Here, we report that Co-Pi nanoparticles with low-coordinate Co ions and doped nitrogen atoms could be decorated on hematite nanorod arrays to form N-CoPi/hematite composites. Moreover, the local atomic configuration and bond distance studies show that trivalent Co3+ states are partially reduced through nitrogen radicals in the plasma to low-coordinate bivalent Co2+ states playing as the facile adsorption sites of oxygen-evolving intermediates due to the decreased activation barrier for water oxidation. Electron transport is also reinforced by nitrogen species due to the formation of hybridizing N 2p orbitals that give the acceptor levels in the bandgap. As a result, both the incident photon-to-electron conversion efficiency and the charge transfer resistance on N-CoPi/hematite outperform those on a bare hematite by about 3 fold. Furthermore, N-CoPi/hematite gives high activity retention over 90% after the long operation of water oxidation, in support of the reaction sites on N-CoPi not degrading during the successive water oxidation. | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | Cobalt-Phosphate Catalysts with Reduced Bivalent Co-Ion States and Doped Nitrogen Atoms Playing as Active Sites for Facile Adsorption, Fast Charge Transfer, and Robust Stability in Photoelectrochemical Water Oxidation | - |
dc.type | Article | - |
dc.identifier.wosid | 000500415700058 | - |
dc.identifier.scopusid | 2-s2.0-85075178430 | - |
dc.type.rims | ART | - |
dc.citation.volume | 11 | - |
dc.citation.issue | 47 | - |
dc.citation.beginningpage | 44366 | - |
dc.citation.endingpage | 44374 | - |
dc.citation.publicationname | ACS APPLIED MATERIALS & INTERFACES | - |
dc.identifier.doi | 10.1021/acsami.9b16523 | - |
dc.contributor.localauthor | Kang, Jeung Ku | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | cobalt-phosphate catalysts | - |
dc.subject.keywordAuthor | reduced low-coordinated bivalent Co2+ states | - |
dc.subject.keywordAuthor | facile adsorption kinetics | - |
dc.subject.keywordAuthor | doped nitrogen atoms | - |
dc.subject.keywordAuthor | fast charge transfer | - |
dc.subject.keywordAuthor | robust stability | - |
dc.subject.keywordAuthor | high activity retention | - |
dc.subject.keywordPlus | ARTIFICIAL PHOTOSYNTHESIS | - |
dc.subject.keywordPlus | SOLAR | - |
dc.subject.keywordPlus | ARRAYS | - |
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