Crystallite Size and Surface Area Dependent Enhanced Photocatalytic CO2 Hydrogenation with Ga doped SrTiO3

Dikshita Bhattacharyya^a, Baliana Shani^a, Ludmilla Steier^a

^aDepartment of Materials, Imperial College London, Exhibition Road, SW7 2AZ London, United Kingdom

^bDepartment of Inorganic Chemistry, University of Oxford, South Parks Road, Oxford

^cDepartment of Inorganic Chemistry, University of Oxford, South Parks Road, Oxford

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)

#MATSF - Advanced materials for the production of direct solar-driven fuels and chemicals

Torremolinos, Spain, 2023 October 16th - 20th

Organizers: Salvador Eslava and Sixto Gimenez Julia

Poster, Dikshita Bhattacharyya, 351
Publication date: 18th July 2023

Photocatalytic CO2 hydrogenation is a promising strategy to produce clean and useful fuels through harvesting solar energy[1]. A prerequisite of the highly efficient photocatalytic process is designing CO2 hydrogenation catalysts that enhance the conversion of useful fuel products. Owing to the high photochemical stabilities of titanate perovskites, SrTiO3 is a promising candidate for photocatalytic reactions. Doping transition metal ions in SrTiO3 is an effective method to increase the efficiency of the catalysts[2]. The photocatalytic activity also depends on the synthesis route of these doped materials which affect the particle size and specific surface areas. Increase in surface area of the catalysts facilitate photocatalysis[3]. In this study, the sol gel Pechini synthesis route of doped SrTiO3 has been found to control the particle size with high specific surface area that aids surface catalysis. The core objective of this work is to study the effect of the synthesis route and doping d10 transition metal ions such as Ga3+ in the Ti4+ site of SrTiO3 in photocatalysis. Enhanced photocatalytic performance of Ga3+ doped SrTiO3 was observed with CO2 hydrogenation to CO. The doped samples were observed to be highly crystalline in nature and and three methods were employed to examine and link the crystallite sizes to surface area which we found was the predominant factor in determining activity.

Keywords: Perovskite Oxide Photocatalysts, Sol gel Pechini, d10 Dopants, Photocatalysis, Crystallite Sizes, TEM, Specific Surface Areas, BET

References:

[1] L. Guo, X. Guo, Y. He, and N. Tsubaki, “CO2 heterogeneous hydrogenation to carbon-based fuels: recent key developments and perspectives,” J. Mater. Chem. A, vol. 11, no. 22, pp. 11637–11669, 2023, doi: 10.1039/d3ta01025b

[2] H. Matsuo et al., “Hydrogenation of CO2 over Mn-Substituted SrTiO3 Based on the Reverse Mars-van Krevelen Mechanism,” J. Phys. Chem. C, vol. 127, no. 19, pp. 8946–8952, 2023, doi: 10.1021/acs.jpcc.3c01183

[3] U. P. I, U. S. Shenoy, and D. K. Bhat, “Nanocubic Copper-Doped SrTiO3 for Photoreduction of Cr(VI) and Photodegradation of Methyl Violet,” ACS Appl. Nano Mater., Sep. 2023, doi: 10.1021/acsanm.3c02997

Acknowledgements:

Authors would like to thank the Department of Materials, Imperial College London and Department of Inorganic Chemistry, University of Oxford for granting access to the instruments required to complete the study.

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