Fabrication of Pd/TiO2-multiwall carbon nanotubes catalyst and investigation of its electrocatalytic activity for formic acid oxidation

► TiO2 was pretreated by 0.5 M HNO3 to enhance its conductivity. ► TiO2 was applied as support between Pd and MWNTs template. ► The introduction of TiO2 promotes the Pd dispersion and decrease the Pd size. ► The application of TiO2 as support highly improved the electrocatalytic activity and stability of the catalyst. ► The Pd/TiO2-MWNTs shows great electrocatalytic ability for formic acid oxidation.