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dc.contributor.authorZhang, Kan
dc.contributor.authorRavishankar, Sandheep
dc.contributor.authorMa, Ming
dc.contributor.authorVeerappan, Ganapathy
dc.contributor.authorBisquert, Juan
dc.contributor.authorFabregat-Santiago, Francisco
dc.contributor.authorPark, Jong Hyeok
dc.date.accessioned2018-03-07T07:55:42Z
dc.date.available2018-03-07T07:55:42Z
dc.date.issued2017
dc.identifier.citationZHANG, Kan, et al. Overcoming charge collection limitation at solid/liquid interface by a controllable crystal deficient overlayer. Advanced Energy Materials, 2017, vol. 7, no 3.ca_CA
dc.identifier.issn1614-6832
dc.identifier.issn1614-6840
dc.identifier.urihttp://hdl.handle.net/10234/173209
dc.description.abstractBulk and surface charge recombination of photoelectrode are two key processes that significantly hinder solar-to-fuel conversion of photoelectrochemical cell (PEC). In this study, the function of a “crystal-deficient” overlayer is unveiled, which outperforms a traditionally used amorphous or crystalline overlayer in PEC water splitting by exhibiting a high conductivity and large electron diffusion length to enable unlimited electron collection. The optimized ≈2.5 nm thickness of the “crystal-deficient” shell results in a depletion layer with a width of 3 nm, which overcomes the flat band limitation of the photovoltage and increases the light absorptivity in the wavelength range from 300 to 420 nm. In addition, a 50-fold increase in the conductivity yields a one-order-of-magnitude increase in the diffusion length of an electron (Ln)(≈20 μm), allowing for unlimited electron collection in the 1.9 μm TiO2 nanowire array with the “crystal-deficient” shell. The controllable “crystal-deficient” overlayer in rutile TiO2 nanowires photoanode achieves a photocurrent density greater than 2.0 mA cm−2 at 1.23 V versus reversible hydrogen electrode (RHE), a 1.18% applied bias photon-to-current efficiency at 0.49 V versus RHE, a faradaic efficiency greater than 93.5% at 0.6 V versus Pt under air mass 1.5G simulated solar light illumination (100 mW cm−2).ca_CA
dc.format.extent8 p.ca_CA
dc.format.mimetypeapplication/pdfca_CA
dc.language.isoengca_CA
dc.publisherWileyca_CA
dc.relation.isPartOfAdvanced Energy Materials, 2017, vol. 7, no 3.ca_CA
dc.rightsCopyright © John Wiley & Sons, Inc. All Rights Reservedca_CA
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/*
dc.subjectcharge carrier separationca_CA
dc.subjectcrystal deficient overlayerca_CA
dc.subjectsolar water splittingca_CA
dc.subjectsolidca_CA
dc.subjectliquid interfaceca_CA
dc.titleOvercoming Charge Collection Limitation at Solid/Liquid Interface by a Controllable Crystal Deficient Overlayerca_CA
dc.typeinfo:eu-repo/semantics/articleca_CA
dc.identifier.doihttp://dx.doi.org/10.1002/aenm.201600923
dc.rights.accessRightsinfo:eu-repo/semantics/restrictedAccessca_CA
dc.relation.publisherVersionhttp://onlinelibrary.wiley.com/doi/10.1002/aenm.201600923/fullca_CA
dc.contributor.funderNRF of Korea Grant - Ministry of Science, ICT, and Future Planning / NRF-2013R1A2A1A09014038; 2015M1A2A2074663; 2016M3D3A1A01913254; Yonsei University Future-leading Research Initiative / 2015-22-0067; Santiago Grisolia program from Generalitat Valenciana / 2014/034; Generalitat Valenciana / PROMETEOII/2014/020ca_CA
dc.type.versioninfo:eu-repo/semantics/publishedVersionca_CA


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