Superior photoelectrochemical activity of self-assembled NiWO4-WO3 heteroepitaxy

Thi Hien Do, Chien Nguyen Van, Kai An Tsai, Le Thi Quynh, Jhih Wei Chen, Yan Cheng Lin, Yi Chun Chen, Wu Ching Chou, Chun Lin Wu, Yung Jung Hsu, Ying Hao Chu

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Self-assembled nanocomposites with a high interface-to-volume ratio offer tremendous opportunities of tailoring functionalities by a proper combination of components. In this study, we report the first fabrication of self-assembled NiWO4-WO3 heteroepitaxy and its excellent performance on photoelectrochemical water splitting. The heteroepitaxy is evidenced by a combination of x-ray diffraction and transmission electron microscopy. The energy band diagram of NiWO4-WO3 heterostructure probed by x-ray photoelectron spectroscopy suggests an efficient charge separation at their interface by injecting photo-generated electrons from NiWO4 to WO3 and holes from WO3 to NiWO4. Therefore, a great improvement in the photoelectrochemical activity of self-assembled NiWO4-WO3 heteroepitaxy was achieved (1400 μA cm-2 at 0.7 V vs. Ag/AgCl). This work delivers a new category of composite materials for promising photoelectrode in photoelectrochemical cells.

Original languageEnglish
Pages (from-to)153-160
Number of pages8
JournalNano Energy
Volume23
DOIs
Publication statusPublished - 2016 May 1

All Science Journal Classification (ASJC) codes

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

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