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Using Obrando Raman spectroscopy to investigate the conversion of carbon dioxide to ethanol on nanowires


CO conversion2 to ethanol on partially oxidized nanowires with high selectivity and activity. Credit: Science China Press

In a study published in the journal China Chemistry Science Led by Professor Pingping Fang (Faculty of Chemistry, Zhejiang University) and Professor Jianfeng Li (Faculty of Chemistry and Chemical Engineering, Xiamen University), the experiments were performed using an Xplora Raman spectrometer with a 50x microscope objective and a 638-nm excitation wavelength of a He–Ne laser.

“Because of the suitable adsorption energy of CO on partially oxidized Ag NWs, it is of great interest to relate ethanol’s high selectivity to CO2 Electrical conductivity of the partially oxidized active center. It has been shown that Ag catalysts exhibit high CO selectivity2 electoreduction to CO at low voltage with low H2 development. CO is an important intermediate for CC coupling, and thus, Ag has the potential to show high selectivity to ethanol products by tuning the CO adsorption energy. This study provides new insight into designing effective catalysts and investigating mechanisms for improving selectivity,” says Fang.

Interestingly, high FE ethanol was obtained on Ag NWs partially oxidized to CO.2 Electrosorption and EC-SERS process combined with DFT calculation elucidated the mechanisms that make the partially oxidized Ag NWs display high ethanol selectivity. The ethanol FE can reach 85% on partially oxidized Ag NWs at −0.95 V vs RHE. Operando EC-SERS found that high CO coverage can significantly facilitate the formation of ethanol on partially oxidized Ag NWs during CO2 Electrodoctoral.

DFT calculation results show that the adsorption energy of CO on partially oxidized Ag NWs is higher than that on Cu, and the reaction free energy of coupling CO with *CHO to *COCHO intermediate on partially oxidized Ag NWs is smaller than that on Cu surface, Which explains the high selectivity of ethanol very well.

Therefore, the experiment results, EC-SERS coefficient calculations and DFT together prove that such partially oxidized Ag NWs can provide high ethanol selectivity for CO.2 Electrodoctoral. These results provide new evidence for the design of Ag-based catalysts for improved ethanol selectivity and mechanism studies.

more information:
Qiong Liu et al, CO conversion2 to ethanol on nanowires with high selectivity investigated by Raman spectroscopy, China Chemistry Science (2022). DOI: 10.1007/s11426-022-1460-7

Provided by Science China Press

the quote: Using operando Raman spectroscopy to investigate the conversion of CO to ethanol on Ag nanowires (2023, March 30) Retrieved March 30, 2023 from https://phys.org/news/2023-03-operando-raman-spectroscopy carbon-dioxide. programming language

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