CeO2 Nanostructures Enriched with Oxygen Vacancies for Photocatalytic CO2 Reduction

Hezam, Abdo and Namratha, Keerthiraj and Drmosh, Q. A. and Ponnamma, Deepalekshmi and Wang, Jingwei and Prasad, Suchitra and Ahamed, Momin and Cheng, Chun and Byrappa, Kullaiah (2020) CeO2 Nanostructures Enriched with Oxygen Vacancies for Photocatalytic CO2 Reduction. ACS Publications, 3 (1). pp. 138-148.

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Abstract

Synthesizing nanomaterials at the expense of solar energy and the associated energy generation have utmost significance as far as environmental sustainability is concerned. Here, sunlight-assisted combustion synthesis of a nanoscale metal oxide (CeO2) is reported. The sunlight, as a clean renewable energy source, is used for the first time to initiate the exothermic combustion reaction and to introduce oxygen vacancies into the CeO2. The current synthesis setup controls the environmental problems of gas evolution, usually associated with the conventional method, and thus maintains the green pathway. Additionally, for comparison, CeO2 nanoparticles are also synthesized using the conventional solution combustion method (CeO2-CSC). It is found that the CeO2 synthesized using sunlight-assisted combustion (CeO(2)SAC) possesses a smaller particle size, a higher concentration of oxygen vacancies, and a narrower band gap than the CeO2CSC. Therefore, CeO2-SAC demonstrates higher photocatalytic performance in converting CO2 to CH3OH (0.702 mu mol h(-1)) than the CeO2-CSC (0.397 mu mol g(-1)), thus pointing toward environmentally benign photocatalytic CO2 reduction.

Item Type: Article
Uncontrolled Keywords: DFT calculations; green sustainable synthesis; oxygen vacancies; mesoporous CeO2; selective CO2 photoreduction
Subjects: D Physical Science > Material Science
Divisions: Department of > Material Science
Depositing User: Mr Umendra uom
Date Deposited: 01 Feb 2021 09:51
Last Modified: 01 Feb 2021 09:51
URI: http://eprints.uni-mysore.ac.in/id/eprint/15669

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