Abstract

A simple electrochemical reduction technique was employed to generate Ti3+ with strong reducing property on the anodic TiO2 nanotubes (ATNTs). Utilizing Ti3+ as the reducing agent, Pd2+ was successfully reduced in situ to Pd0 on the anodic TiO2 nanotubes (Pd@ATNTs). Various characterization methods were employed to confirm that the proportion of Ti3+ and the size of Pd nanoparticles could be controlled by adjusting the electrochemical reduction voltage. The obtained Pd@ATNTs-2.5 exhibited satisfactory catalytic efficiency (TOF: 1302h-1) in the Heck reaction between various aryl halides and olefins. Furthermore, Pd@ATNTs-2.5 demonstrated high stability, with no significant loss of catalytic activity observed even after six cycles.

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