Photoactive multilayer WO3 electrode synthesized via dip-coating

Author(s)

Ferrari, Victoria C. ^[1] ; Dupim, Ivaldete S. ^[1] ; Sousa, Vinicius ^[1] ; Souza, Flavio L. ^[1]

Affiliation

^[1] Univ Fed ABC, CCNH, Av Estados 5001, BR-09210580 Santo Andre, SP - Brazil

• Document type: Journal article
• Source: CERAMICS INTERNATIONAL; v. 44, n. 18, p. 22983-22990, DEC 15 2018.
• Web of Science Citations: 1

Abstract

This work describes a multilayer tungsten oxide photoanode synthesized via facile dip-coating deposition solution for sunlight-driven water oxidation reaction. The number of layers (three, five and ten) followed by a successive annealing process at each deposited layer has strongly influenced their performance. The ten-layers tungsten oxide photoanode exhibited the highest photocurrent density around 0.7 mA/cm(2) at 1.23 V-RHE, under sunlight irradiation. This photocurrent response corresponds to 17% of solar-to-hydrogen conversion efficiency (STH) from the maximum theoretical predicted for tungsten oxide (4.8%). The successive annealing treatment promoted a reduction in the number of grain boundaries, yielding in higher film porosity and surface roughness, which decreased the charge transfer resistance and the electron-hole recombination rate. (AU)

• FAPESP's process: 17/02317-2 - Interfaces in materials: electronic, magnetic, structural and transport properties
• Grantee: Adalberto Fazzio
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC