Experimental Evidence of CO2 Photoreduction Activity of SnO2 Nanoparticles. Issue 21 (23rd October 2020)

• Record Type: Journal Article
• Authors: Torres, Juliana Arriel; Da Silva, Gelson T. S. T.; Barbosa de Freitas Silva, Fernando; Ribeiro, Caue
• Is Part Of: Chemphyschem. Volume 21:Issue 21(2020)
• Page Start: 2392
• Page End: 2396
• Publication Date: 2020-10-23
• Subjects: carbon dioxide -- gas-solid reaction -- photocatalysis -- surface hydroxylation -- tin dioxide; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.202000786
• Languages: English
• ISSNs: 1439-4235

Abstract

Abstract: Tin dioxide (SnO2 ) has intrinsic characteristics that do not favor its photocatalytic activity. However, we evidenced that surface modification can positively influence its performance for CO2 photoreduction in the gas phase. The hydroxylation of the SnO2 surface played a role in the CO2 affinity decreasing its reduction potential. The results showed that a certain selectivity for methane (CH4 ), carbon monoxide (CO), and ethylene (C2 H4 ) is related to different SnO2 hydrothermal annealing. The best performance was seen for SnO2 annealed at 150 °C, with a production of 20.4 μmol g −1 for CH4 and 16.45 μmol g −1 for CO, while for SnO2 at 200 °C the system produced more C2 H4, probably due to a decrease of surface −OH groups. Abstract : SnO2 nanoparticles are synthesized and applied in the CO2 photoreduction process. The synthesis methodology produces strongly bonded ‐OH groups, which influences the process of reducing the CO2 potential as well as its affinity. The hydroxyl groups act as charge mediators, reducing the potential for CO2 reduction. The semiconductors show selectivity to C1 hydrocarbons and the sample subjected to higher annealing shows selectivity for C2 products.