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A Mechanistic Study of Molecular CO2 Interaction and Adsorption on Carbon Implanted SnS2 thin Film for Photocatalytic CO2 Reduction Activity

Publication Type : Journal Article

Publisher : Nano Energy

Source : Volume 72, p.104717

Url : http://www.sciencedirect.com/science/article/pii/S2211285520302743

Keywords : Artificial photosynthesis, Photocatalytic CO reduction, SnS, solar fuels

Campus : Kochi

School : Center for Nanosciences

Year : 2020

Abstract : Gas-phase photocatalytic reactions to convert carbon dioxide and water into oxygen and hydrocarbons are the foundation of life on earth. However, the efficiency of photosynthesis is relatively low ( 1%), which leaves much room for artificial photosynthesis to reach the benchmark of the solar cells (>15%). In this work, carbon implanted SnS2 thin films (C–SnS2) were prepared to study photocatalytic activity and adsorbate-catalyst surface interactions during CO2 photoreduction. The electron density distribution in C–SnS2 and its contribution toward the photogenerated charge transfer process has been analyzed by the angle-dependent X-ray absorption near-edge structure (XANES) study. The C–SnS2 surface affinity toward the CO2 molecule was monitored by in-situ dark current and Raman spectroscopy measurements. By optimizing the dose during ion implantation, SnS2 thin film with 1 wt% carbon incorporation shows 108 times enhancement in the CO2 conversion efficiency and more than 89% product selectivity toward CH4 formation compared with the as-grown SnS2 without carbon incorporation. The improved photocatalytic activity can be ascribed to enhanced light harvesting, pronounced charge-transfer between SnS2 and carbon with improved carrier separation and the availability of highly active carbon sites that serve as favorable CO2 adsorption sites. Cite this Research Publication

Cite this Research Publication : T. Billo, Shown, I., Anbalagan, Akumar, Effendi, T. Amerta, Sabbah, A., Fu, F. - Y., Chu, C. - M., Woon, W. - Y., San Chen, R. -, Lee, C. - H., Chen, K. - H., and Chen, L. - C., “A Mechanistic Study of Molecular CO2 Interaction and Adsorption on Carbon Implanted SnS2 thin Film for Photocatalytic CO2 Reduction Activity”, Nano Energy, vol. 72, p. 104717, 2020.

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