Jump to main content
Jump to site search


Modification of 1D TiO2 nanowires with GaOxNy by atomic layer deposition for TiO2@GaOxNy core–shell nanowires with enhanced photoelectrochemical performance

Author affiliations

Abstract

As a well-known semiconductor that can catalyse the oxygen evolution reaction, TiO2 has been extensively investigated for its solar photoelectrochemical water properties. Unmodified TiO2 shows some issues, particularly with respect to its photoelectrochemical performance. In this paper, we present a strategy for the controlled deposition of controlled amounts of GaOxNy cocatalysts on TiO2 1D nanowires (TiO2@GaOxNy core–shell) using atomic layer deposition. We show that this modification significantly enhances the photoelectrochemical performance compared to pure TiO2 NW photoanodes. For our most active TiO2@GaOxNy core–shell nanowires with a GaOxNy thickness of 20 nm, a photocurrent density up to 1.10 mA cm−2 (at 1.23 V vs. RHE) under AM 1.5 G irradiation (100 mW cm−2) has been achieved, which is 14 times higher than that of unmodified TiO2 NWs. Furthermore, the band gap matching with TiO2 enhances the absorption of visible light over unmodified TiO2 and the facile oxygen vacancy formation after the deposition of GaOxNy also provides active sites for water activation. Density functional theory studies of model systems of GaOxNy–modified TiO2 confirm the band gap reduction, high reducibility and ability to activate water. The highly efficient and stable systems of TiO2@GaOxNy core–shell nanowires with ALD deposited GaOxNy demonstrate a good strategy for the fabrication of core–shell structures that enhance the photoelectrochemical performance of readily available photoanodes.

Graphical abstract: Modification of 1D TiO2 nanowires with GaOxNy by atomic layer deposition for TiO2@GaOxNy core–shell nanowires with enhanced photoelectrochemical performance

Back to tab navigation

Supplementary files

Article information


Submitted
27 Dec 2019
Accepted
23 Feb 2020
First published
24 Feb 2020

Nanoscale, 2020, Advance Article
Article type
Paper

Modification of 1D TiO2 nanowires with GaOxNy by atomic layer deposition for TiO2@GaOxNy core–shell nanowires with enhanced photoelectrochemical performance

J. Tao, H. Ma, K. Yuan, Y. Gu, J. Lian, X. Li, W. Huang, M. Nolan, H. Lu and D. Zhang, Nanoscale, 2020, Advance Article , DOI: 10.1039/C9NR10908K

Social activity

Search articles by author

Spotlight

Advertisements