Titanium dioxide as support material for Pt_1Pd_3 toward methanol oxidation

摘要

The electrocatalytic oxidation of methanol on the Pt1Pd3 nanoparticles supported on rutile TiO2 in alkaline solution is investigated. The Pt1Pd3 nanoparticles are prepared by the chemical co-reduction of the precursors of Pt and Pd and then loaded on TiO2. The Pt1Pd3 nanoparticles with sizes of about 2-4 nm and a certain degree of aggregation are dispersed on TiO2. The position and shape of the methanol oxidation peak on Pt1Pd3/TiO2 are more similar to those on Pt/TiO2 than those on Pd/TiO2, while Pt1Pd3/TiO2 exhibits higher catalytic activity, e.g., a significantly higher peak intensity, than Pt1Pd3/C, Pt/TiO2 and Pd/TiO2. This indicates the advantage of TiO2 as a support material and the strong synergy between the Pt1Pd3 and TiO2 and between the Pt and Pd. Moreover, Pt1Pd3/TiO2 has a high tolerance for the poisoning caused by CO. Rutile TiO2 is shown to be suitable as a support material for the Pt1Pd3 to achieve enhanced catalytic activity and stability. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.