Hydrogen production and simultaneous photoelectrocatalytic pollutant oxidation using a TiO2/WO3 nanostructured photoanode under visible light irradiation

T. T. Guaraldo; V. R. Gonçales; B. F. Silva; S. I.C. De Torresi; M. V.B. Zanoni

doi:10.1016/j.jelechem.2015.07.034

Hydrogen production and simultaneous photoelectrocatalytic pollutant oxidation using a TiO₂/WO₃ nanostructured photoanode under visible light irradiation

T. T. Guaraldo, V. R. Gonçales, B. F. Silva, S. I.C. De Torresi, M. V.B. Zanoni

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

44 Citations (SciVal)

Abstract

Photoelectrochemical (PEC) hydrogen production and simultaneous organic waste degradation is a re-emerging field. The main challenge of this technique has been the synthesis of new photoanode materials that are active towards visible light. Coupling close band gap energy oxides can be used to obtain materials with new optical and electronic properties. For this purpose, Ti/TiO₂/WO₃ electrodes were prepared by electrochemical anodization followed by templating and cathodic electrodeposition. The nanostructured bicomponent material was used as a photoanode for simultaneous hydrogen generation and organic dye degradation. A good photoactivity response (11 mA cm -²) was obtained under UV and visible light irradiation, when compared to pure TiO₂ (8 mA cm -²). Optimization of photoelectrochemical conditions revealed that pH optimization had a major impact on H₂ production, resulting in satisfactory hydrogen generation efficiency (46%) and dye removal (100% discoloration and 85% reduction in TOC). A dye oxidation mechanism is proposed, based on LC-MS/MS analyses. The TiO₂/WO₃ photoanode could potentially be used for environmental remediation and hydrogen generation under solar irradiation.

Original language	English
Pages (from-to)	188-196
Number of pages	9
Journal	Journal of Electroanalytical Chemistry
Volume	765
DOIs	https://doi.org/10.1016/j.jelechem.2015.07.034
Publication status	Published - 15 Mar 2016

Bibliographical note

Funding Information:
The authors thank FAPESP (process no. 2009/17346-1, 2008/10449-7 , 2008/10449-7 ), CAPES , and CNPq ( 446245/2014-3 ) for financial support of this work. We are indebted to Dra. Sandra I. Maintinguer and Renan Pachiega of IQAr-UNESP for the GC-TCD analyses.

Funding

The authors thank FAPESP (process no. 2009/17346-1, 2008/10449-7 , 2008/10449-7 ), CAPES , and CNPq ( 446245/2014-3 ) for financial support of this work. We are indebted to Dra. Sandra I. Maintinguer and Renan Pachiega of IQAr-UNESP for the GC-TCD analyses.

Keywords

Bicomponent electrodes
Dye degradation
Photoelectrochemical hydrogen production
TiO/WO templates

ASJC Scopus subject areas

Analytical Chemistry
General Chemical Engineering
Electrochemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.jelechem.2015.07.034

Cite this

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title = "Hydrogen production and simultaneous photoelectrocatalytic pollutant oxidation using a TiO2/WO3 nanostructured photoanode under visible light irradiation",

abstract = "Photoelectrochemical (PEC) hydrogen production and simultaneous organic waste degradation is a re-emerging field. The main challenge of this technique has been the synthesis of new photoanode materials that are active towards visible light. Coupling close band gap energy oxides can be used to obtain materials with new optical and electronic properties. For this purpose, Ti/TiO2/WO3 electrodes were prepared by electrochemical anodization followed by templating and cathodic electrodeposition. The nanostructured bicomponent material was used as a photoanode for simultaneous hydrogen generation and organic dye degradation. A good photoactivity response (11 mA cm -2) was obtained under UV and visible light irradiation, when compared to pure TiO2 (8 mA cm -2). Optimization of photoelectrochemical conditions revealed that pH optimization had a major impact on H2 production, resulting in satisfactory hydrogen generation efficiency (46%) and dye removal (100% discoloration and 85% reduction in TOC). A dye oxidation mechanism is proposed, based on LC-MS/MS analyses. The TiO2/WO3 photoanode could potentially be used for environmental remediation and hydrogen generation under solar irradiation.",

keywords = "Bicomponent electrodes, Dye degradation, Photoelectrochemical hydrogen production, TiO/WO templates",

author = "Guaraldo, {T. T.} and Gon{\c c}ales, {V. R.} and Silva, {B. F.} and {De Torresi}, {S. I.C.} and Zanoni, {M. V.B.}",

note = "Funding Information: The authors thank FAPESP (process no. 2009/17346-1, 2008/10449-7 , 2008/10449-7 ), CAPES , and CNPq ( 446245/2014-3 ) for financial support of this work. We are indebted to Dra. Sandra I. Maintinguer and Renan Pachiega of IQAr-UNESP for the GC-TCD analyses. ",

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AU - Guaraldo, T. T.

AU - Gonçales, V. R.

AU - Silva, B. F.

AU - De Torresi, S. I.C.

AU - Zanoni, M. V.B.

N1 - Funding Information: The authors thank FAPESP (process no. 2009/17346-1, 2008/10449-7 , 2008/10449-7 ), CAPES , and CNPq ( 446245/2014-3 ) for financial support of this work. We are indebted to Dra. Sandra I. Maintinguer and Renan Pachiega of IQAr-UNESP for the GC-TCD analyses.

PY - 2016/3/15

Y1 - 2016/3/15

N2 - Photoelectrochemical (PEC) hydrogen production and simultaneous organic waste degradation is a re-emerging field. The main challenge of this technique has been the synthesis of new photoanode materials that are active towards visible light. Coupling close band gap energy oxides can be used to obtain materials with new optical and electronic properties. For this purpose, Ti/TiO2/WO3 electrodes were prepared by electrochemical anodization followed by templating and cathodic electrodeposition. The nanostructured bicomponent material was used as a photoanode for simultaneous hydrogen generation and organic dye degradation. A good photoactivity response (11 mA cm -2) was obtained under UV and visible light irradiation, when compared to pure TiO2 (8 mA cm -2). Optimization of photoelectrochemical conditions revealed that pH optimization had a major impact on H2 production, resulting in satisfactory hydrogen generation efficiency (46%) and dye removal (100% discoloration and 85% reduction in TOC). A dye oxidation mechanism is proposed, based on LC-MS/MS analyses. The TiO2/WO3 photoanode could potentially be used for environmental remediation and hydrogen generation under solar irradiation.

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