Abstract

We explored the selective surface doping of anodically formed TiO2 nanotube arrays (TNTAs) with divalent Sr2+ cations using an electrochemical cathodization process in order to modify the basicity of the surface and modify the interactions of the surface with vapor phase CO2. The resulting Sr-doped TNTAs showed a 3-fold increase in CO2 photoreduction activity. Characterization using a broad suite of bulk- and surface-sensitive characterization techniques revealed the doped Sr atoms to be widely dispersed on the surface. Our results show a way forward to achieve single atom catalysts using cathodic doping of TiO2.

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