title: Particle size control of Pd/C for improved electrocatalytic activity in a formic acid oxidation.
abstract: Carbon-supported Pd electrocatalyst is prepared by an improved aqueous impregnation method applying a reducing agent of HCHO and an acidic sedimentation promoter of HCl. We investigate the effect of a solution pH on the zeta potential of both Pd particles and carbon support. The opposite sign of zeta potential results in uniform dispersion of Pd on carbon surface without aggregation problem. TEM analysis shows that optimal solution pH of 4.27 adjusted by NaOH provides a mean particle diameter of 3.2 nm with narrow size distribution. Cyclic voltammograms indicate that home-made Pd/C catalyst exhibits significantly higher electrochemical active surface area and better stability compared with commercial 40 wt.% Pd/C in a formic acid oxidation.
authors: Department of Chemistry, Seoul National University, Seoul 151-747, Republic of Korea.
authors: Seunghee
authors: S
authors: Woo
authors: In
authors: I
authors: Kim
authors: Sungyool
authors: S
authors: Bong
authors: Jaeyoung
authors: J
authors: Lee
authors: Hasuck
authors: H
authors: Kim