WO3/W:BiVO4/BiVO4 graded photoabsorber electrode for enhanced photoelectrocatalytic solar light driven water oxidation

Junghyun Choi, Pitchaimuthu Sudhagar, Joo Hyun Kim, Jiseok Kwon, Jeonghyun Kim, Chiaki Terashima, Akira Fujishima, Taeseup Song, Ungyu Paik

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

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 BiVO4 water 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 BiVO4 water oxidation catalyst. As a result, the WO3/BiVO4 hetero photoanode containing the photoactive W:BiVO4 interfacial layer showed 130% higher photocurrent than that of the interfacial layer-free hetero photoelectrode owing to the enhanced charge separation led water oxidation process.

Original languageEnglish
Pages (from-to)4648-4655
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume19
Issue number6
DOIs
StatePublished - 2017

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