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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Photocatalytic and Photoelectrochemical Water Oxidation over Metal-Doped Monoclinic BiVO4 Photoanodes

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dc.contributor.author Parmar, Kanak Pal Singh ko
dc.contributor.author Kang, Hyun Joon ko
dc.contributor.author Bist, Amita ko
dc.contributor.author Dua, Piyush ko
dc.contributor.author Jang, Jum Suk ko
dc.contributor.author Lee, Jae Sung ko
dc.date.available 2015-07-29T00:54:46Z -
dc.date.created 2015-07-27 ko
dc.date.issued 2012-10 -
dc.identifier.citation CHEMSUSCHEM, v.5, no.10, pp.1926 - 1934 ko
dc.identifier.issn 1864-5631 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/12816 -
dc.identifier.uri http://onlinelibrary.wiley.com/doi/10.1002/cssc.201200254/abstract ko
dc.description.abstract The visible-light-induced water oxidation ability of metal-ion-doped BiVO4 was investigated and of 12 metal ion dopants tested, only W and Mo dramatically enhanced the water photo-oxidation activity of bare BiVO4; Mo had the highest improvement by a factor of about six. Thus, BiVO4 and W- or Mo-doped (2 atom?%) BiVO4 photoanodes about 1 mu m thick were fabricated onto transparent conducting substrate by a metalorganic decomposition/spin-coating method. Under simulated one sun (air mass 1.5G, 100 mW?cm-2) and at 1.23 V versus a reversible hydrogen electrode, the highest photocurrent density (JPH) of about 2.38 mA?cm-2 was achieved for Mo doping followed by W doping (JPH approximate to 1.98 mA?cm-2), whereas undoped BiVO4 gave a JPH value of about 0.42 mA?cm-2. The photoelectrochemical water oxidation activity of W- and Mo-doped BiVO4 photoanodes corresponded to the incident photon to current conversion efficiency of about 35 and 40?% respectively. Electrochemical impedance spectroscopy and MottSchottky analysis indicated a positive flat band shift of about 30 mV, a carrier concentration 1.62 times higher, and a charge-transfer resistance reduced by 34-fold for W- or Mo-doped BiVO4 relative to undoped BiVO4. Electronic structure calculations revealed that both W and Mo were shallow donors and Mo doping generated superior conductivity to W doping. The photo-oxidation activity of water on BiVO4 photoanodes (undoped<W doped<Mo doped) was in accordance with the results from electrochemical impedance spectroscopy, MottSchottky analysis, and theoretical electronic structural calculations. Thus, Mo or W doping enhanced the photocatalytic and photoelectrochemical water oxidation activity of monoclinic BiVO4 by drastically reducing its charge-transfer resistance and thereby minimizing photoexcited electronhole pair recombination ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher WILEY-V C H VERLAG GMBH ko
dc.subject doping ko
dc.subject electrochemistry ko
dc.subject oxidation ko
dc.subject photochemistry ko
dc.subject water splitting ko
dc.title Photocatalytic and Photoelectrochemical Water Oxidation over Metal-Doped Monoclinic BiVO4 Photoanodes ko
dc.title.alternative Photocatalytic and Photoelectrochemical Water Oxidation over Metal-Doped Monoclinic BiVO4 Photoanodes ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84867532626 ko
dc.identifier.wosid 000310074200009 ko
dc.type.rims ART ko
dc.description.wostc 38 *
dc.description.scopustc 34 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1002/cssc.201200254 ko
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