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Efficient photochemical water splitting and organic pollutant degradation by highly ordered TiO2 nanopore arrays

Paper ID Volume ID Publish Year Pages File Format Full-Text
47845 46483 2009 7 PDF Available
Title
Efficient photochemical water splitting and organic pollutant degradation by highly ordered TiO2 nanopore arrays
Abstract

We synthesized highly ordered TiO2 nanopore arrays (TNPs) with controllable pore size and good uniformity by anodization at low temperature in fluorinated dimethyl sulfoxide (DMSO) solution with a post-sonication treatment. TNPs possess excellent separation and transport properties of photo-generated electron/hole pair and hence reveal enhanced photocurrent response and photochemical properties for water splitting and organic compound degradation. The TNPs present maximum photo-conversion efficiency for water splitting of 0.28% under AM1.5 irradiation. This value compares favorably with a maximum photo-conversion efficiency of 0.21% for TiO2 nanotube arrays (TNAs) under the same conditions. When illuminated with 1.0 mW cm−2 UV light, the maximum photo-conversion efficiency can be increased to 22% for TNPs, which is 5% higher than TNAs. The kinetic constant of photoelectrocatalytic (PEC) degradation of methyl orange (MO) for TNPs is found to be 1.27 times as high as that for TNAs when biased at 0.5 V. The visible light response of TNPs might be further improved by relevant surface modification technology.

Graphical abstractThe highly ordered TiO2 nanopore arrays (TNPs) were fabricated by anodization of titanium under potentiostatic conditions at low temperature in a fluorinated dimethyl sulfoxide electrolyte with a post-sonication treatment. The TNPs possess excellent separation and transport properties of photo-generated electron/hole pair and reveal enhanced photocurrent responses and photochemical properties for water splitting and organic compound degradation. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
TiO2 nanopore arrays; Water splitting; Organic compound degradation
First Page Preview
Efficient photochemical water splitting and organic pollutant degradation by highly ordered TiO2 nanopore arrays
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 89, Issues 1–2, 3 July 2009, Pages 142–148
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis