Issue 37, 2021

Spacing prior to decorating TiO2 nanowires with dewetted Au nanoparticles for boosting photoelectrochemical water oxidation

Abstract

Au/TiO2-based systems with the right combination of electronic configuration, structural dynamics, and stability have recently attracted wide attention in photoelectrochemical (PEC) water splitting for hydrogen generation. Here, we used the masking effect of Au nanoparticles that were dewetted from sputtered Au thin films to fabricate TiO2 nanowire arrays with restricted planar coalescence on flat nucleation layers. The well-spaced vertically aligned TiO2 nanowires allowed for effective coating of another Au thin film by sputtering. A further thermal dewetting process led to a uniform distribution of Au nanoparticles along the nanowire surface. When this sample was used as a photoanode for PEC water splitting, significantly increased photocurrent density and improved PEC activity toward water oxidation were achieved. Systematic electrochemical and PEC characterization demonstrated that the dual functions of the dewetted Au nanoparticles in regulation and surface passivation of TiO2 nanowires were indispensable for the efficient generation, transfer, and separation of photogenerated charge carriers and the consequential boosted PEC water oxidation performance.

Graphical abstract: Spacing prior to decorating TiO2 nanowires with dewetted Au nanoparticles for boosting photoelectrochemical water oxidation

Supplementary files

Article information

Article type
Paper
Submitted
07 Jūl. 2021
Accepted
07 Aug. 2021
First published
10 Aug. 2021

CrystEngComm, 2021,23, 6551-6558

Spacing prior to decorating TiO2 nanowires with dewetted Au nanoparticles for boosting photoelectrochemical water oxidation

Y. Cai, F. Yuan, F. Li, H. Kang, D. Xue, S. Huo, F. Yu, J. Fang and Y. Yang, CrystEngComm, 2021, 23, 6551 DOI: 10.1039/D1CE00886B

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