Highly dispersed carbon-supported Pd nanoparticles catalyst synthesized by novel precipitation-reduction method for formic acid electrooxidation

摘要

The highly dispersed and ultrafine carbon-supported Pd nanoparticles (Pd/C) catalyst is synthesized by using an improved precipitation-reduction method, which involves in Pd~(II) → PdO·H_2O→Pd~0 reaction path. In the method, palladium oxide hydrate (PdO·H_2O) nanoparticles (NPs) with high dispersion is obtained easily by adjusting solution pH in the presence of 1,4-butylenediphosphonic acid (H_2O_3P-(CH_2)_4-PO_3H_2, BDPA). After NaBH_4 reduction, the resulting Pd/C catalyst possesses high dispersion and small particle size. As a result, the electrochemical measurements indicate that the resulting Pd/C catalyst exhibits significantly high electrochemical active surface area and high electrocatalytic performance for formic acid electrooxidation compared with that prepared by general NaBH_4 reduction method.