No abstract

No abstract

A novel Pd/SnO 2 -TiO 2 /multiwalled carbon nanotube (MWCNT) catalyst was synthesized using a facile and controllable in situ chemical method. Pretreated TiO 2 was anchored to a functional MWCNT template, which was used as a support material to enhance the stability and electrical conductivity of the Pd nanoparticles. The Sn(II) ions adsorbed on the surface of the TiO 2 precursor acted as reducing agents and ensured that Pd reduction only occurred on the precursor surface. The physicochemical properties of the catalyst were determined by transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The results showed that small metallic Pd nanoparticles were evenly dispersed over the catalyst surface. Cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy were used to evaluate the electrocatalytic properties of the Pd/SnO 2 -TiO 2 /MWCNT catalyst in an alkaline solution containing 0.5 M NaOH and 1.0 M ethylene glycol. The high dispersion of the metallic Pd nanoparticles caused by the presence of the SnO 2 -TiO 2 precursor significantly enhanced the electrocatalytic activity and tolerance of the catalyst to the accumulation of carbonaceous species. This new Pd/SnO 2 -TiO 2 /MWCNT catalyst is a promising candidate for use in the oxidation of ethylene glycol under alkaline conditions.

This paper describes the synthesis and performance of Pd/p‐TiO2‐MWCNTs for alcohol electrooxidation. Regulation of the steric repulsive forces of polyvinylpyrrolidone was used to achieve even dispersion of Pd nanoparticles over the TiO2 surfaces. The order of the electroactivities of the Pd/p‐TiO2MWCNTs in alcohol oxidation was ethanol>ethylene glycol>methanol. The order of the stabilities of alcohol oxidation by Pd/p‐TiO2MWCNTs was ethylene glycol>ethanol>methanol. Electroimpedance spectroscopy showed that at a potential of −0.1 V, the Pd/p‐TiO2MWCNTs had good tolerance of adsorbed CO in ethylene glycol oxidation, and at −0.2 V, the Pd/p‐TiO2MWCNTs had good adsorbed CO tolerance in methanol oxidation.