Aminated TiO2 nanotube as a Photoelectrochemical Water Splitting photoanode
Seyedsina Hejazi, Nhat Truong Nguyen, Anca Mazare, Patrik Schmuki
TL;DR
This study enhances TiO2 nanotube photoanodes for water splitting by amine decoration, resulting in a fourfold increase in efficiency and faster electron transport, applicable under UV and visible light.
Contribution
It introduces a hydrothermal amine coating method that significantly improves TiO2 nanotubes' photoelectrochemical performance and electron transport properties.
Findings
Fourfold increase in water splitting rate.
Enhanced photoresponse in UV and visible spectrum.
Faster electron transport due to surface passivation.
Abstract
The present work reports on the enhancement of TiO2 nanotubes photoelectrochemical water splitting rate by decorating the nanostructure with an amine layer in a hydrothermal process using diethylenetriamine (DETA). The aminate coated TiO2 tubes show a stable improvement of the photoresponse in both UV and visible light spectrum and under hydrothermal conditions, 4-fold increase of the photoelectrochemical water splitting rate is observed. From intensity modulated photocurrent spectroscopy (IMPS) measurements significantly faster electron transport times are observed indicating a surface passivating effect of the N-decoration.
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