Syngas production by electrocatalytic reduction of CO 2 using Ag-decorated TiO 2 nanotubes

M. A. Farkhondehfal, S. Hernández, M. Rattalino, M. Makkee, A. Lamberti, A. Chiodoni, K. Bejtka, A. Sacco, F. C. Pirri, N. Russo

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Abstract

Huge efforts have been done in the last years on electrochemical and photoelectrochemical reduction of CO 2 to offer a sustainable route to recycle CO 2 . A promising route is to electrochemically reduce CO 2 into CO which, by combination with hydrogen, can be used as a feedstock to different added-value products or fuels. Herein, perpendicular oriented TiO 2 nanotubes (NTs) on the electrode plate were grown by anodic oxidation of titanium substrate and then decorated by a low loading of silver nanoparticles deposited by sputtering (i.e. Ag/TiO 2 NTs). Due to their quasi one-dimensional arrangement, TiO 2 NTs are able to provide higher surface area for Ag adhesion and superior electron transport properties than other Ti substrates (e.g. Ti foil and TiO 2 nanoparticles), as confirmed by electrochemical (CV, EIS, electrochemical active surface area) and chemical/morphological analysis (FESEM, TEM, EDS). These characteristics together with the role of the TiO 2 NTs to enhance the stability of CO 2 ·- intermediate formed due to titania redox couple (Ti IV /Ti III ) lead to an improvement of the CO production in the Ag/TiO 2 NTs electrodes. Particular attention has been devoted to reduce the loading of noble metal in the electrode(14.5 %w/%w) and to increase the catalysts active surface area in order to decrease the required overpotential.

Original languageEnglish
JournalInternational Journal of Hydrogen Energy
DOIs
Publication statusPublished - 2019

Keywords

  • CO2 reduction
  • Electrocatalyst
  • Electrochemical surface area
  • Silver nano particles
  • Titania nanotube

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    Farkhondehfal, M. A., Hernández, S., Rattalino, M., Makkee, M., Lamberti, A., Chiodoni, A., Bejtka, K., Sacco, A., Pirri, F. C., & Russo, N. (2019). Syngas production by electrocatalytic reduction of CO 2 using Ag-decorated TiO 2 nanotubes. International Journal of Hydrogen Energy. https://doi.org/10.1016/j.ijhydene.2019.04.180