Jump to main content
Jump to site search


Epitaxial facet junctions on TiO2 single crystals for efficient photocatalytic water splitting

Author affiliations

Abstract

Metal oxide semiconductors with surface homojunctions characteristic of continuous band bending and well-defined epitaxial interfaces show amazing potential for photocatalytic applications. Herein, a new concept of facet junctions is proposed and validated according to the synergy between the co-exposed crystal facets of shape-tailored anatase TiO2 single crystals. By considering the atomic and electronic interactions between the co-exposed facets, our density functional theory calculations reveal the existence of type-II band alignment between the co-exposed {001} and {101} facets. This band alignment results in in situ construction of a facet junction to allow built-in facet-mediated carrier transfer. The self-constructed {101}/{001} facet junction, due to the effective carrier separation between different exposed facets, exhibits a significantly enhanced quantum efficiency and catalytic performance in photochemical hydrogen generation compared to TiO2 poly-crystals. These findings open a new horizon of facet junction-engineered nano-catalysts for more robust and efficient energy and environmental applications.

Graphical abstract: Epitaxial facet junctions on TiO2 single crystals for efficient photocatalytic water splitting

Back to tab navigation

Supplementary files

Publication details

The article was received on 08 Dec 2017, accepted on 03 Apr 2018 and first published on 03 Apr 2018


Article type: Communication
DOI: 10.1039/C7EE03482B
Citation: Energy Environ. Sci., 2018, Advance Article
  •   Request permissions

    Epitaxial facet junctions on TiO2 single crystals for efficient photocatalytic water splitting

    A. Zhang, W. Wang, J. Chen, C. Liu, Q. Li, X. Zhang, W. Li, Y. Si and H. Yu, Energy Environ. Sci., 2018, Advance Article , DOI: 10.1039/C7EE03482B

Search articles by author

Spotlight

Advertisements