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Rapid hydrogenation of amorphous TiO2 to produce efficient H-doped anatase for photocatalytic water splitting

Paper ID Volume ID Publish Year Pages File Format Full-Text
39147 45808 2015 5 PDF Available
Title
Rapid hydrogenation of amorphous TiO2 to produce efficient H-doped anatase for photocatalytic water splitting
Abstract

•ITO/TiO2 heterostructures were deposited by RF-magnetron sputtering.•Mild annealing in H2 atmosphere converts amorphous TiO2 into H-doped anatase.•H atoms formed hydroxyl groups passivating dangling bonds.•DFT calculations endorsed experimental results.•H:TiO2 showed enhanced photocatalytic activity.

Hydrogen-doped anatase titanium dioxide (H:TiO2) thin films were synthesized by a mild annealing in hydrogen atmosphere of amorphous TiO2 thin films deposited on ITO by RF-magnetron sputtering. Two kinds of TiO2 electrodes (amorphous and anatase) were tested for the H-doping in different annealing conditions, but H-doped anatase was obtained exclusively by a rapid heat treatment in hydrogen atmosphere of amorphous TiO2 at 300 °C. Instead, anatase thin films required enforced annealing conditions to incorporate H, leading to an undesirable conversion to rutile. XPS analysis reveals that in H-doped anatase thin films H atoms are bonded to O. DFT calculations, performed to investigate the density of states, predict a slight band-gap narrowing, in agreement with spectroscopic evidence. Photoelectrochemical measurements on H:TiO2 showed an elevated current density of 0.99 mA/cm2 at 1.23 V vs. RHE in oxygen evolution reaction, revealing better performance than pure anatase TiO2. This enhancement in catalytic activity is accounted to the effect of dangling bonds passivation performed by highly reactive H atoms, which reduce the density of carrier recombination centers. The used method for the conversion of amorphous TiO2 thin film in H:doped anatase TiO2 can be extended to amorphous TiO2 prepared by various techniques.

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Keywords
Hydrogen doped anatase TiO2; Dangling bonds; Photocatalytic water splitting; Solar energy conversion; Hydrogen generation
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Rapid hydrogenation of amorphous TiO2 to produce efficient H-doped anatase for photocatalytic water splitting
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 500, 5 July 2015, Pages 69–73
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