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Particle Size Control of Pd/C for Improved Electrocatalytic Activity in a Formic Acid Oxidation
- Particle Size Control of Pd/C for Improved Electrocatalytic Activity in a Formic Acid Oxidation
- Woo, S[Woo, Seunghee]; Kim, I[Kim, In]; Bong, S[Bong, Sungyool]; Lee, J[Lee, Jaeyoung]; Kim, H[Kim, Hasuck]
- DGIST Authors
- Kim, H[Kim, Hasuck]
- Issue Date
- Journal of Nanoscience and Nanotechnology, 11(8), 7412-7415
- Article Type
- Article; Proceedings Paper
- Agglomeration; Aqueous Impregnation; Carbon; Carbon Support; Carbon Surface; Catalyst Activity; Cyclic Voltammograms; Electrocatalysts; Electrocatalytic Activity; Electrochemical Active Surface Areas; Formic Acid; Formic Acid Oxidation; Impregnation; Improved Aqueous Impregnation Method; Mean Particle Diameter; Narrow Size Distributions; Optimal Solutions; Oxidation; Particle Size Control; Pd Electrocatalyst; Pd Particle; Pd/C Catalyst; pH Effects; Solution pH; TEM Analysis; Uniform Dispersions; Zeta Potential
- 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. © 2011 American Scientific Publishers.
- American Scientific Publishers
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