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N-doped TiO2 nanotubes coated with a thin TaOxNy layer for photoelectrochemical water splitting: Dual bulk and surface modification of photoanodes

Authors
Kim, Hyoung-ilMonllor-Satoca, DamianKim, WooyulChoi, Wonyong
Issue Date
Jan-2015
Publisher
Royal Society of Chemistry
Citation
Energy and Environmental Science, v.8, no.1, pp 247 - 257
Pages
11
Journal Title
Energy and Environmental Science
Volume
8
Number
1
Start Page
247
End Page
257
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159077
DOI
10.1039/c4ee02169j
ISSN
1754-5692
1754-5706
Abstract
TaON is a good photoanode material with a suitable band structure for water splitting as well as coupling with TiO2 for efficient charge separation. However, the synthesis of TaON that requires high temperature nitridation (850 °C) limits the combination with other materials. In this work, we deposited a thin amorphous TaOxNy layer on N-doped TiO2 nanotubes (N-TNTs) through low temperature nitridation (500 °C) and demonstrated its successful performance as an efficient photoanode for water-splitting. Since the preparation temperature is low, TaOxNy on N-TNTs has a unique amorphous structure with a smooth thin layer (5 nm). It is proposed that the thin amorphous TaOxNy layer plays dual roles: (i) surface sensitization and/or charge rectification at the heterojunction between the TaOxNy layer and N-TNTs, and (ii) passivation of N-TNT surface trap states to retard the charge recombination. TaOxNy layer-decorated N-TNTs as dual modified TNTs (N-doping in the bulk and TaOxNy overlayer deposition on the surface) have significantly improved both visible (ca. 3.6 times) and UV (ca. 1.8 times) activities for PEC water-splitting as well as the faradaic efficiency (ca. 1.4 times, η = 98%) for H2 production. Making the amorphous TaOxNy layer crystalline at higher temperatures reduced the PEC activity of the hybrid photoanod
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