Huge efforts have been done in the last years on electrochemical and photoelectrochemical reduction of CO
2
...
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.
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