Complex Oxides Based on Silver, Bismuth, and Tungsten: Syntheses, Characterization, and Photoelectrochemical Behavior

C. Longo, M. T. Galante, R. Fitzmorris, J. Z. Zhang, S. F.R. Taylor, J. Mohapatra, J. P. Liu, L. G.T.A. Duarte, M. K. Hossain, C. Hardacre, K. Rajeshwar

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Silver-containing complex oxides present interesting light absorption and electronic properties pointing to their applicability for solar fuel generation and environmental remediation. In this vein, the syntheses, characterization, and photoelectrochemical properties of the Aurivillius oxide, AgBiW2O8, and a triphasic material, AgBiW2O8/Bi2WO6/Ag, are described herein. From UV-vis diffuse reflectance analysis, both oxides' nanoparticles exhibited intense absorption at wavelengths <455 nm, with an additional band centered at ∼500 nm for the triphasic material, attributed to surface plasmon resonance of the metallic Ag phase. The triphasic material was further characterized by a variety of structural and spectroscopic probes, indicating a defect-rich crystalline structure. Voltammetric measurements were performed in the dark and under simulated solar irradiation with polarization at potentials more negative than the rest potential. Thin film electrodes of both materials showed p-type semiconductor behavior, with enhanced cathodic photocurrent in the presence of electron acceptors in aqueous media.

Original languageEnglish
Pages (from-to)13473-13480
Number of pages8
JournalJournal Of Physical Chemistry C
Volume122
Issue number25
Early online date8 Feb 2018
DOIs
Publication statusPublished (in print/issue) - 28 Jun 2018

Bibliographical note

Funding Information:
This work was supported, in part, by CNPq, FAPESP, the National Institute of Science, Technology, and Innovation on Advanced Complex Materials (INOMAT), and The University of Texas at Arlington. C.L. and M.T.G. gratefully acknowledge the CAPES−PDSE program for financial support (88881.131530/2016-01) and the Fulbright and Royal Society of Chemistry for scholarships. C.H. and R.T. gratefully acknowledge funding from the EPSRC (EP/N009533/1). Dr. Teresa Atvars (UNICAMP) provided the photoluminescence spectroscopy instrument setup. Finally, we thank the two anonymous reviewers for their insightful comments and constructive criticisms.

Publisher Copyright:
© 2018 American Chemical Society.

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