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Efficient electrochemical reduction of CO2into CO promoted by sulfur vacancies
- Source :
- Nano Energy; June 2019, Vol. 60 Issue: 1 p43-51, 9p
- Publication Year :
- 2019
-
Abstract
- Electrochemical conversion of carbon dioxide (CO2) into useful chemicals has attracted a lot of attention to store energy and reduce the greenhouse effect. Herein, a new electrocatalyst of carbon nanotubes coated with cadmium sulfide is reported, the faradaic efficiency (FE) of CO2reduction reaction (CO2RR) to carbon monoxide (CO) is as high as 95%. We clearly demonstrate that sulfur vacancies (S-vacancies) are in-situgenerated on the catalyst surface in CO2RR, which is evidenced by electron paramagnetic resonance spectra (EPR), in-situdifferential electrochemical mass spectrometry (DEMS) and inductively-coupled plasma spectrometer (ICP). With the increase of S-vacancies, the catalytic activity of CO2RR to CO improve significantly and the charge-transfer resistance decrease. Combined with in-situinfrared absorption spectroscopy and density functional theory calculations, it can be concluded that the formation of S-vacancies changes the electron density of the catalyst surface and decreases the energy barrier for the conversion of COOH∗to CO∗. Finally, we tried to power electrochemical reduction of CO2with solar panel under natural light conditions, the energy conversion efficiency on CdS-CNT catalyst from solar energy to CO has been calculated, predicting a hopeful application prospect in the future.
Details
- Language :
- English
- ISSN :
- 22112855
- Volume :
- 60
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Nano Energy
- Publication Type :
- Periodical
- Accession number :
- ejs49335309
- Full Text :
- https://doi.org/10.1016/j.nanoen.2019.03.024