ENVR 23 |
| Electrochemical deposition of metals from hexagonal lyotropic liquid crystalline phases produces metal films with a unique ordered nanostructure in which the cylindrical pores of 1.7 to 3.5 nm running through the film are arranged in hexagonal arrays. Nanostructured Pd films were deposited electrochemically from the hexagonal template mixture. Electrochemical studies showed that the metal films have a high electroactive surface area with the specific surface area of the order of 91 m2/g. These values together with the TEM and X-ray data are consistent with the expected H1 nanostructure. The hydrogen region of nanostructured Pd in the cyclic voltammetry in 1 M sulphuric acid was more resolved than that of plain Pd because of the thin walls of the nanostructure and the high surface area. We could distinguish the hydrogen adsorption and absorption processes. The permeation of hydrogen (deuterium) into the Pd metal lattice occurs with fast kinetics when the Pd surface is blocked by either crystal violet or Pt. We believe that the hydrogen absorption process takes place without passing through the adsorbed state so that hydrogen diffuses directly into the Pd bulk. This process speeds up when the formation of adsorbed hydrogen is suppressed by the coverage of poisons. We think that the detailed investigation of the Pd-H(D) electrochemistry using the nanostructure might be an important issue to approach low energy nuclear reactions. |
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New Energy Technology
1:30 PM-5:15 PM, Sunday, March 22, 2009 Hilton -- Alpine Ballroom West, Oral
Division of Environmental Chemistry |