Heteroepitaxial approach to explore charge dynamics across Au/BiVO4 interface for photoactivity enhancement

Chien Nguyen Van, Wei Sea Chang, Jhih Wei Chen, Kai An Tsai, Wen Yen Tzeng, Yan Cheng Lin, Ho Hung Kuo, Heng Jui Liu, Kao Der Chang, Wu Ching Chou, Chung Lin Wu, Yi Chun Chen, Chih Wei Luo, Yung Jung Hsu, Ying Hao Chu

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

Heterostructure provides a powerful route in manipulating electrical transport, optical response, electrolytic water splitting and water treatment of complex oxides. As a model for noble metal/ complex oxide heterostructures, we have successfully prepared Au/BiVO4 (BVO) heterostructures in which the Au nanoparticles (NPs) with various sizes and densities were uniformly deposited on the {001} facets of epitaxial BVO thin films. The heterostructures exhibit significantly enhanced photoactivities in both dye degradation and electrolytic water splitting. By employing X-ray photoelectron spectroscopy, the energy band alignment of Au/BVO heterojunction suggests a charge separation at their interfaces, that can manipulate the photoexcited electron-hole pairs and photocatalytic efficiency of the heterostructures. Photogenerated carrier injection, which mainly affects the photoactivity of photocatalysis, was detected across Au/BVO interfaces by ultrafast dynamics spectroscopy. This study delivers a general approach to probe and understand the photochemistry of noble metal-complex oxide heterostructures for photoconversion applications.

Original languageEnglish
Pages (from-to)625-633
Number of pages9
JournalNano Energy
Volume15
DOIs
Publication statusPublished - 2015 Jul 1

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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