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Ruthenium Oxide‐Doped TiO 2 Nanotubes by Single‐Step Anodization for Water‐Oxidation Applications
Author(s) -
Yoo Hyeonseok,
Choi YongWook,
Choi Jinsub
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201402787
Subject(s) - ruthenium oxide , anodizing , materials science , ruthenium , oxide , electrolyte , ethylene glycol , chemical engineering , dissolution , substrate (aquarium) , doping , inorganic chemistry , nanotechnology , water splitting , catalysis , electrode , chemistry , organic chemistry , composite material , metallurgy , aluminium , oceanography , optoelectronics , engineering , geology , photocatalysis
Single‐step anodization in NH 4 F‐based ethylene glycol electrolyte containing KRuO 4 and H 2 O led to the production of high‐aspect‐ratio TiO 2 nanotubes (NTs) with a doping of ruthenium oxide. These NTs were successfully used as electrodes for water oxidation in KOH. This method offers homogenous incor poration of a small amount of ruthenium oxide (≈0.12 wt %) into 25 μm TiO 2 nanotubes without the need for complicated facilities or steps. The addition of H 2 O into electrolytes is a key step for the stable adhesion of long‐length TiO 2 NT films on a substrate. The tips of the TiO 2 nanotubes prepared by this novel method are not easily dissolved by electrolyte because the walls of the nanotubes are thickened by a factor of more than two in response to the addition of KRuO 4 and H 2 O. The longest nanotubular TiO 2 with a doping of ruthenium oxide and no wall dissolution shows the largest current density in the oxygen‐evolution reaction.