title: Molten Ag2SO4-based Ion-Exchange Preparation of Ag0.5La0.5TiO3for Photocatalytic O2Evolution.
abstract: Ag0.5La0.5TiO3with an ABO3perovskite structure was synthesized by a newly developed ion-exchange method. Molten Ag2SO4instead of traditional molten AgNO3was used as Ag+source in view of its high decomposition temperature (1052 °C), thereby guaranteeing the complete substitution of Ag+for Na+in Na0.5La0.5TiO3with a stable ABO3perovskite structure at a high ion-exchange temperature (700 °C). Under full-arc irradiation, the O2-evolution activity of Ag0.5La0.5TiO3was about 1.6 times that of Na0.5La0.5TiO3due to the optimized electronic band structures and local lattice structures. On the one hand, the substitution of Ag+for Na+elevated the VBM and thus narrowed the band gap from 3.19 to 2.83 eV, thereby extending the light-response range and, accordingly, enhancing the photoexcitation to generate more charge carriers. On the other hand, the substitution of Ag+for Na+induced a lattice distortion of the ABO3perovskite structure, thereby promoting the separation and migration of charge carriers. Moreover, under visible-light irradiation, Ag0.5La0.5TiO3displayed notable O2evolution whereas Na0.5La0.5TiO3showed little O2evolution, thus demonstrating that the substitution of Ag+for Na+enabled the use of visible light to evolve O2photocatalytically. This work presents an effective route to explore novel Ag-based photocatalysts.
authors.affiliation: International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University (XJTU), 28 West Xianning Road, Xi'an, 710049, China.
authors.forename: Shichao
authors.initials: S
authors.lastname: Zong
authors.affiliation: International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University (XJTU), 28 West Xianning Road, Xi'an, 710049, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Cheng
authors.affiliation: International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University (XJTU), 28 West Xianning Road, Xi'an, 710049, China.
authors.forename: Jinwen
authors.identifier: http://orcid.org/0000-0001-7291-2840
authors.initials: J
authors.lastname: Shi
authors.affiliation: International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University (XJTU), 28 West Xianning Road, Xi'an, 710049, China.
authors.forename: Zhenxiong
authors.initials: Z
authors.lastname: Huang
authors.affiliation: International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University (XJTU), 28 West Xianning Road, Xi'an, 710049, China.
authors.forename: Yuchao
authors.initials: Y
authors.lastname: Hu
authors.affiliation: International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University (XJTU), 28 West Xianning Road, Xi'an, 710049, China.|Department of Environmental Science and Engineering, Xi'an Jiaotong University (XJTU), 28 West Xianning Road, Xi'an, 710049, China.
authors.forename: Honghui
authors.initials: H
authors.lastname: Yang
authors.affiliation: International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University (XJTU), 28 West Xianning Road, Xi'an, 710049, China.
authors.forename: Liejin
authors.initials: L
authors.lastname: Guo
keywords: ion exchange; oxygen evolution; perovskite; photocatalysis; silver