Photocatalytic properties of TiO2 : effect of niobium and oxygen activity on partial water oxidation

Wenxian Li; Tadeusz Bak; Armand Atanacio; Janusz Nowotny

doi:10.1016/j.apcatb.2016.05.044

Photocatalytic properties of TiO2 : effect of niobium and oxygen activity on partial water oxidation

Wenxian Li, Tadeusz Bak, Armand Atanacio, Janusz Nowotny

Western Sydney University

Research output: Contribution to journal › Article › peer-review

Abstract

This work reports the effect of niobium (0–1 at%) on photocatalytic activity and the band gap of TiO2 with controlled oxygen activity in the range 10−12 Pa < p(O2)<105 Pa. It is shown that maximum of photocatalytic performance in partial water oxidation is observed for Nb-doped TiO2 containing 1 at% Nb that is processed at 1273 K in pure oxygen, p(O2) = 105 Pa. The mechanism of photocatalytic water oxidation is considered in terms of a predominant effect of photocatalytically active surface sites corresponding to titanium vacancies. It is shown that the niobium-induced increase of the band gap, surface potential and charge transport have a minor influence on photoreactivity of Nb-doped TiO2 with water.

Original language	English
Pages (from-to)	243-253
Number of pages	11
Journal	Applied Catalysis B: Environmental
Volume	198
DOIs	https://doi.org/10.1016/j.apcatb.2016.05.044
Publication status	Published - 2016

Keywords

defect chemistry
niobium
oxide semiconductors
photocatalysis
titanium dioxide
water

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10.1016/j.apcatb.2016.05.044

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title = "Photocatalytic properties of TiO2 : effect of niobium and oxygen activity on partial water oxidation",

abstract = "This work reports the effect of niobium (0–1 at%) on photocatalytic activity and the band gap of TiO2 with controlled oxygen activity in the range 10−12 Pa < p(O2)<105 Pa. It is shown that maximum of photocatalytic performance in partial water oxidation is observed for Nb-doped TiO2 containing 1 at% Nb that is processed at 1273 K in pure oxygen, p(O2) = 105 Pa. The mechanism of photocatalytic water oxidation is considered in terms of a predominant effect of photocatalytically active surface sites corresponding to titanium vacancies. It is shown that the niobium-induced increase of the band gap, surface potential and charge transport have a minor influence on photoreactivity of Nb-doped TiO2 with water.",

keywords = "defect chemistry, niobium, oxide semiconductors, photocatalysis, titanium dioxide, water",

author = "Wenxian Li and Tadeusz Bak and Armand Atanacio and Janusz Nowotny",

year = "2016",

doi = "10.1016/j.apcatb.2016.05.044",

language = "English",

volume = "198",

pages = "243--253",

journal = "Applied Catalysis B: Environmental",

issn = "0926-3373",

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TY - JOUR

T1 - Photocatalytic properties of TiO2 : effect of niobium and oxygen activity on partial water oxidation

AU - Li, Wenxian

AU - Bak, Tadeusz

AU - Atanacio, Armand

AU - Nowotny, Janusz

PY - 2016

Y1 - 2016

N2 - This work reports the effect of niobium (0–1 at%) on photocatalytic activity and the band gap of TiO2 with controlled oxygen activity in the range 10−12 Pa < p(O2)<105 Pa. It is shown that maximum of photocatalytic performance in partial water oxidation is observed for Nb-doped TiO2 containing 1 at% Nb that is processed at 1273 K in pure oxygen, p(O2) = 105 Pa. The mechanism of photocatalytic water oxidation is considered in terms of a predominant effect of photocatalytically active surface sites corresponding to titanium vacancies. It is shown that the niobium-induced increase of the band gap, surface potential and charge transport have a minor influence on photoreactivity of Nb-doped TiO2 with water.

AB - This work reports the effect of niobium (0–1 at%) on photocatalytic activity and the band gap of TiO2 with controlled oxygen activity in the range 10−12 Pa < p(O2)<105 Pa. It is shown that maximum of photocatalytic performance in partial water oxidation is observed for Nb-doped TiO2 containing 1 at% Nb that is processed at 1273 K in pure oxygen, p(O2) = 105 Pa. The mechanism of photocatalytic water oxidation is considered in terms of a predominant effect of photocatalytically active surface sites corresponding to titanium vacancies. It is shown that the niobium-induced increase of the band gap, surface potential and charge transport have a minor influence on photoreactivity of Nb-doped TiO2 with water.

KW - defect chemistry

KW - niobium

KW - oxide semiconductors

KW - photocatalysis

KW - titanium dioxide

KW - water

UR - http://handle.uws.edu.au:8081/1959.7/uws:35329

U2 - 10.1016/j.apcatb.2016.05.044

DO - 10.1016/j.apcatb.2016.05.044

M3 - Article

SN - 0926-3373

VL - 198

SP - 243

EP - 253

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

ER -

Photocatalytic properties of TiO2 : effect of niobium and oxygen activity on partial water oxidation

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