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Oxygen-deficient WO3-x@TiO2-x Core-shell Nanosheets for Efficient Photoelectrochemical Oxidation of Neutral Water Solutions

Abstract

Preparation of highly active, stable and earth-abundant photoanodes for water oxidation is an important strategy to meet the demand of developing clean-energy technologies. In this paper, efficient and stable photoanodes based on oxygen-deficient black WO3–x@TiO2–x core-shell nanosheets with precisely controlled shell thickness have been fabricated for photoelectrochemical (PEC) conversion from neutral water solutions. The black WO3–x@TiO2–x core-shell nanosheet photoanode with the shell thickness of ~ 15 nm achieved around 8 times higher photocurrent density (~3.20 mA/cm2) than pure WO3 photoanode at 1.23 V vs. RHE. An improved onset potential with long-term PEC durability was also realized with the obtained black WO3–x@TiO2–x core-shell nanosheet photoanodes. The promoted PEC water oxidation performance was likely to be originated from enhanced light absorption, interfacial charge transfer and charge separation in these WO3–x@TiO2–x nanosheets which were revealed by finite-difference time-domain simulations, specific band alignment, along with optical and electrochemical spectroscopic evidences. In a word, such black WO3-x@TiO2-x nanosheet photoanodes suggest many exciting opportunities for PEC water splitting toward highly efficient solar fuel generation, and many other PEC sensing applications.

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Publication details

The article was received on 05 May 2017, accepted on 15 Jun 2017 and first published on 15 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA03878J
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Oxygen-deficient WO3-x@TiO2-x Core-shell Nanosheets for Efficient Photoelectrochemical Oxidation of Neutral Water Solutions

    K. Yuan, Q. Cao, H. Lu, M. Zhong, X. Zheng, H. Chen, T. Wang, J. Delaunay, W. Luo, L. Zhang, Y. Wang, Y. Deng, S. Ding and D. W. Zhang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03878J

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