Bifunctional doping effect on the TiO2 nanowires for photoelectrochemical water splitting

Title
Bifunctional doping effect on the TiO2 nanowires for photoelectrochemical water splitting
Author(s)
김현식[김현식]Dang Thanh Nguyen[Dang Thanh Nguyen]Eui-Chol Shin[Eui-Chol Shin]Jong-Sook Lee[Jong-Sook Lee]Sang Kwon Lee[Sang Kwon Lee]안광순강순형[강순형]
Keywords
SENSITIZED SOLAR-CELLS; ONE-POT SYNTHESIS; ANATASE TIO2; PHOTOCATALYTIC ACTIVITY; THIN-FILMS; RUTILE; NANOCRYSTALS; NANORODS; ARRAYS; LAYER
Issue Date
201312
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v.114, pp.159 - 164
Abstract
Rutile TiO2 nanorods (TONRs) with a length of 3.7 mu m were synthesized using a simple hydrothermal method. In order to control the morphology of the film and doping effect, Si was then added to the reaction solution. Si-doped TONRs (Si-TONRs) film shows distinct morphological properties such as thinner diameter, shorter length, and large surface area coverage of nanorods (NRs) compared to those of the pristine TONRs film. Furthermore, a Mott-Schottky analysis confirmed that a small amount of increased carrier concentration was induced by the Si doping while the flat-band potential (E-FB) is maintained as constant. The linear sweep voltammograms displayed an outstanding photocurrent density of Si-TONR film with 2.75 mA/cm(2) at 0 V vs. Ag/AgCl, compared with 0.88 mA/cm(2) of the TONR film. Also, Si-TONR film revealed a solar-to-hydrogen (STH) conversion efficiency exceeding 2%, which is a 3-fold increased efficiency compared to that of TONR film and is ascribed to the favorable charge transportation through the novel nanoarchitecture which minimizes the charge recombination due to the increased electron concentration. (C) 2013 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/28014http://dx.doi.org/10.1016/j.electacta.2013.09.170
ISSN
0013-4686
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공과대학 > 화학공학부 > Articles
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