Jain, N and Roy, A and De, A (2019) Ba-addition induced enhanced surface reducibility of SrTiO3: implications on catalytic aspects. In: Nanoscale Advances, 1 (12). pp. 4938-4946.
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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.
| Item Type: | Journal Article |
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| Publication: | Nanoscale Advances |
| Publisher: | Royal Society of Chemistry |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Barium titanate; Oxygen vacancies; Perovskite; Sodium Borohydride; Strontium titanates, Catalytic materials; Cubic perovskite; Enhanced surface; Hydrothermal methods; Nascent hydrogens; Redox treatments; Surface reduction; Temperature-programmed reduction, Catalyst activity |
| Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
| Date Deposited: | 25 Oct 2022 10:35 |
| Last Modified: | 25 Oct 2022 10:35 |
| URI: | https://eprints.iisc.ac.in/id/eprint/77566 |
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