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Epitaxial growth of WO3 nanoneedles by flame: engineering of hole transport and water oxidation reactivity

Abstract

Charge carrier dynamics and light harvesting abilities are of the most important roles to the performance of a photoanode in the Photoelectrochemical (PEC) area. In this work, through a facile flame surface treatment process in a reducing atmosphere, oriented WO3 nanoneedles are grown on pre-formed vertically aligned nanohelices. Nanohelices have excellent light harvesting abilities on their own, however, the addition of nanoneedles to the top of nanohelices increases the light harvesting abilities even further. More importantly, the reducing atmosphere for the post treatment process enhances the metallic property of WO3, changes the band position to facilitate hole transport, and modifies the flat band potential, all of which contribute to an improved performance regarding the photocurrent density and onset. The as fabricated nanohelices/nanoneedles WO3 with metallic interface has also been used for heterojunction photoanode fabrication for water oxidation through two- and four- electron pathways for H2O2 and O2 production, respectively.

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Publication details

The article was received on 03 May 2018, accepted on 10 Sep 2018 and first published on 10 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA04081H
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Epitaxial growth of WO3 nanoneedles by flame: engineering of hole transport and water oxidation reactivity

    X. Shi, L. Cai, I. Y. Choi, M. Ma, K. Zhang, J. Zhao, J. K. Kim, J. K. Kim, X. Zheng and J. H. Park, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA04081H

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