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Title: Ba-addition induced enhanced surface reducibility of SrTiO3: implications on catalytic aspects
Authors: Jain, N. 
Roy, A.
De, A.
Issue Date: 2019
Publisher: Royal Society of Chemistry
Citation: Jain, N., Roy, A., De, A. (2019). Ba-addition induced enhanced surface reducibility of SrTiO3: implications on catalytic aspects. Nanoscale Advances 1 (12) : 4938-4946. ScholarBank@NUS Repository.
Rights: Attribution-NonCommercial 4.0 International
Abstract: Surface reducibility engineering is one of the vital tools to enhance the catalytic activity of materials. A heavy redox treatment can be utilized to affect the structure and surface of catalytic materials. Here, we choose SrTiO3 (STO) with a cubic perovskite structure as a system to induce oxygen vacancies by using nascent hydrogen from NaBH4 leading to a heavily reduced version of SrTiO3 (RSTO). To further understand the surface reduction and its dependence on foreign-ion (Ba) incorporation into SrTiO3, Sr0.5Ba0.5TiO3 (SBTO) and BaTiO3 (BTO) are synthesized using a facile hydrothermal method. The reduced version of the pristine and mixed oxide shows distinct optical absorptions, indicating oxygen vacancy-mediated reducibility engineering. Detailed CO oxidation experiments suggest the order of activity over the as-prepared and reduced supports as STO > SBTO > BTO and RSBTO > RSTO > RBTO, respectively. The interesting observation of reversal of CO oxidation activity over STO and SBTO after reduction negates the assumption of a similar intensity of reduction on the surfaces of these oxide supports. The fundamental aspect of surface reducibility is addressed using temperature programmed reduction/oxidation (TPR/TPO) and XPS. © 2019 The Royal Society of Chemistry.
Source Title: Nanoscale Advances
ISSN: 25160230
DOI: 10.1039/c9na00540d
Rights: Attribution-NonCommercial 4.0 International
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