Abstract
The electrochemical Peltier heat for the surface hydrogen process at a pt-Pt electrode in 0.5 M H 2SO 4 solution was measured under controlled-potential and controlled-current polarizations using a thick film thermistor electrode. The observed Peltier heat is related to the entropy change of the reversible hydrogen process. In the hydrogen potential region, four stepwise heat changes were observed. These heat changes corresponds to the adsorption of four hydrogen species with different adsorption strenghts, respectively. The most weakly bonded hydrogen species H w exhibited the largest Peltier heat. This is possibly due to the strong interaction of H w with the water molecules of the solvent. Peltier effects for the other three adsorption species are explained in terms of the nature of the adsorption sites where hydrogen atoms adsorb with a different mobility or vibrational movement, resulting in a different entropy.
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