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dc.contributor.author한태희-
dc.date.accessioned2017-11-21T00:38:08Z-
dc.date.available2017-11-21T00:38:08Z-
dc.date.issued2016-01-
dc.identifier.citationELECTROCHIMICA ACTA, v. 187, Page. 249-255en_US
dc.identifier.issn0013-4686-
dc.identifier.issn1873-3859-
dc.identifier.urihttp://www.sciencedirect.com/science/article/pii/S0013468615308215?via%3Dihub-
dc.identifier.urihttp://hdl.handle.net/20.500.11754/31705-
dc.description.abstractPhotocarrier (e(-)/ h(+)) generation at low dimension graphene quantum dots offers multifunctional applications including bioimaging, optoelectronics and energy conversion devices. In this context, graphene quantum dots onto metal oxide electron transport layer finds great deal of attention in solar light driven photoelectrochemical (PEC) hydrogen fuel generation. The merits of combining tailored optical properties of the graphene quantum dots sensitizer with the transport properties of the host wide band gap one dimensional nanostructured semiconductor provide a platform for high charge collection which promotes catalytic proton reduction into fuel generation at PEC cells. However, understanding the underlying mechanism of photocarrier transfer characteristics at graphene quantum dots/metal oxide interface during operation is often difficult as graphene quantum dots may have a dual role as sensitizer and catalyst. Therefore, exploring photocarrier generation and injection at graphene quantum dot/metal oxide heterointerfaces in contact with hole scavenging electrolyte afford a new pathway in developing graphene quantum dots based photoelectrochemical fuel generation systems. In this work, we demonstrate direct assembly of surface modified graphene quantum dots (similar to 2 nm particle size) onto TiO2 hollow nanowire (similar to 3 mm in length and similar to 100 to 250 nm in diameter) by electrostatic attraction and examine the photocarrier accumulation and recombination processes leading to device operation. Optical characterization reveals that GQDs absorbed light photons at visible light wavelength up to 600 nm. Hybrid TiO2-GQDs heterostructures show a photocurrent enhancement of similar to 70% for water oxidation compared to pristine TiO2 using sacrificial-free electrolyte, which is further validated by incident photon to current efficiency. Additionally, the charge accumulation processes and charge transfer characteristics are investigated by electrochemical impedance spectroscopy. These results provide the platform to understand the insights of graphene quantum dots/metal oxide interfaces in PEC reactions and discuss the feasibility of graphene quantum dots in wide range of electrochemical and photoelectrochemical based fuel conversion devices. (C) 2015 Elsevier Ltd. All rights reserved.en_US
dc.description.sponsorshipThis research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF 2014R1A1A1008196). The author PS (ID: P13374) are highly grateful to the "Japan Society for the Promotion of Science (JSPS) Postdoctoral Fellowship Program for Foreign Researchers" for the financial assistance. This work was also supported by the Korea Center for Artificial Photosynthesis (KCAP) located in Sogang University funded through the National Research Foundation of Korea (No. 2009-0093883).en_US
dc.language.isoenen_US
dc.publisherPERGAMON-ELSEVIER SCIENCE LTDen_US
dc.subjectTiO2en_US
dc.subjectgraphene quantum dotsen_US
dc.subjectwater splittingen_US
dc.subjectsolar fuelen_US
dc.subjectphotoelectrochemicalen_US
dc.subjectcharge transferen_US
dc.titleExploring Graphene Quantum Dots/TiO2 interface in photoelectrochemical reactions: Solar to fuel conversionen_US
dc.typeArticleen_US
dc.relation.volume187-
dc.identifier.doi10.1016/j.electacta.2015.11.048-
dc.relation.page249-255-
dc.relation.journalELECTROCHIMICA ACTA-
dc.contributor.googleauthorSudhagar, Pitchaimuthu-
dc.contributor.googleauthorHerraiz-Cardona, Isaac-
dc.contributor.googleauthorPark, Hun-
dc.contributor.googleauthorSong, Taesup-
dc.contributor.googleauthorNoh, Seung Hyun-
dc.contributor.googleauthorGimenez, Sixto-
dc.contributor.googleauthorSero, Ivan Mora-
dc.contributor.googleauthorFabregat-Santiago, Francisco-
dc.contributor.googleauthorBisquert, Juan-
dc.contributor.googleauthorHan, Tae Hee-
dc.relation.code2016000116-
dc.sector.campusS-
dc.sector.daehakCOLLEGE OF ENGINEERING[S]-
dc.sector.departmentDEPARTMENT OF ORGANIC AND NANO ENGINEERING-
dc.identifier.pidthan-
dc.identifier.researcherIDE-8590-2015-
dc.identifier.orcidhttp://orcid.org/0000-0001-5950-7103-
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COLLEGE OF ENGINEERING[S](공과대학) > ORGANIC AND NANO ENGINEERING(유기나노공학과) > Articles
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