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Photo-chargeable and dischargeable TiO2 and WO3 heterojunction electrodes

Paper ID Volume ID Publish Year Pages File Format Full-Text
46408 46439 2012 7 PDF Available
Title
Photo-chargeable and dischargeable TiO2 and WO3 heterojunction electrodes
Abstract

TiO2 and WO3 heterojunction electrodes are studied for their bi-functionality on harvesting light and storing energy. Both semiconductors are fabricated either ‘single’ (mixed) electrodes or two different electrodes galvanically coupled in a mixed electrolyte of 0.1 M sodium formate and 0.1 M sodium chloride. Irradiation of AM 1.5-light shifts the open circuit potentials (OCPs) of the mixed and coupled electrodes from around −0.1 VSCE (dark OCPs) to a potential range between −0.8 and −0.5 VSCE, which slowly return to their respective dark OCPs over a period of around 14 h. Such discharging periods are significantly influenced by the irradiation (photocharging) time and weight or area ratios of TiO2 and WO3. When the TiO2 and WO3 mixed electrodes are galvanically coupled to stainless steel electrodes for application to anticorrosion, the mixed potentials of the couple are maintained at ca. −0.4 VSCE over 10 h even after light off. The measured galvanic currents verify that the photogenerated electrons of TiO2 flow to WO3 (charging) and even overflow to the steel (cathodic protection) during the irradiation, while the stored electrons at WO3 flow to the galvanically coupled steel electrodes directly or through the TiO2 upon light off.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► TiO2 and WO3 mixed electrodes have bi-functionality of light conversion and storage. ► Electron flow between TiO2 and WO3 upon light on (photocharging) is demonstrated to be reversed upon light off (discharging). ► The mixed electrodes can be applied to anticorrosion of steel in the presence and absence of daylight. ► The charging/discharging behaviors are significantly affected by ratios of TiO2 and WO3 in weight and area.

Keywords
Artificial photosynthesis; Discharging; Battery; Galvanic; Anticorrosion; Solar
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 115–116, 5 April 2012, Pages 74–80
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us