title: WO3/W:BiVO4/BiVO4graded photoabsorber electrode for enhanced photoelectrocatalytic solar light driven water oxidation.
abstract: We demonstrate the dual advantages of graded photoabsorbers in mesoporous metal oxide-based hetero interfacial photoanodes in improving photogenerated charge carrier (e-/h+) separation for the solar light-driven water-oxidation process. The pre-deposition of sol-gel-derived, tungsten-doped bismuth vanadate (W:BiVO4) onto a primary BiVO4water oxidation layer forms graded interfaces, which facilitate charge transfer from the primary photoabsorber to the charge transport layer, thereby superseding the thickness-controlled charge recombination at the BiVO4water oxidation catalyst. As a result, the WO3/BiVO4hetero photoanode containing the photoactive W:BiVO4interfacial layer showed 130% higher photocurrent than that of the interfacial layer-free hetero photoelectrode owing to the enhanced charge separation led water oxidation process.
authors.affiliation: Department of Energy Engineering, Hanyang University, Seoul, South Korea. upaik@hanyang.ac.kr.
authors.forename: Junghyun
authors.initials: J
authors.lastname: Choi
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: Pitchaimuthu
authors.identifier: http://orcid.org/0000-0001-9098-8806
authors.initials: P
authors.lastname: Sudhagar
authors.affiliation: Department of Energy Engineering, Hanyang University, Seoul, South Korea. upaik@hanyang.ac.kr.
authors.forename: Joo Hyun
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Energy Engineering, Hanyang University, Seoul, South Korea. upaik@hanyang.ac.kr.
authors.forename: Jiseok
authors.initials: J
authors.lastname: Kwon
authors.affiliation: Department of Energy Engineering, Hanyang University, Seoul, South Korea. upaik@hanyang.ac.kr.
authors.forename: Jeonghyun
authors.initials: J
authors.lastname: Kim
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: Chiaki
authors.initials: C
authors.lastname: Terashima
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Fujishima
authors.affiliation: School of Materials Science and Engineering, Yeungnam University, Gyeongsan, South Korea. tsong@yu.ac.kr.
authors.forename: Taeseup
authors.initials: T
authors.lastname: Song
authors.affiliation: Department of Energy Engineering, Hanyang University, Seoul, South Korea. upaik@hanyang.ac.kr.
authors.forename: Ungyu
authors.initials: U
authors.lastname: Paik