Abstract
RuO 2/TiO 2 nanotubes (NTs) and nanoparticles (NPs) composite electrodes were prepared by loading of RuO 2 on TiO 2 nanotubes and nanoparticles, respectively. The electrochemical reduction properties of CO 2 on these two composite modified platinum electrodes have been investigated by cyclic voltammetry, steady-state polarization and electrolysis in aqueous solution, respectively. The prolonged potentiostatic electrolysis of CO 2 led to the formation of methanol even under low overpotential. The current efficiency for conversion of CO 2 to methanol was up to 60.5% on the RuO 2/TiO 2 NTs modified Pt electrode. Compared with RuO 2 and RuO 2/TiO 2 NPs composite electrodes, RuO 2/TiO 2 NTs composite modified Pt electrode had the higher electrocatalytic activity for the electrochemical reduction of CO 2 to methanol. The results suggested that the nanotubes structure is important to get the high efficiency and selectivity for electrochemical reduction of CO 2.
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