Abstract
A new plate-type electrode with high sensitivity and responsive to temperature change was made using a thick film thermistor. The electrochemical Peltier heat for the oxygen surface process at a platinized platinum electrode in 0.5 M H 2SO 4 solution was measured with this electrode by potentiodynamic and galvanostatic transient techniques. It was demonstrated that most of the Peltier heat is caused by the overpotential due to the irreversible oxygen electrode reaction. That is, a Tafel-type relations between the Peltier heat and the current was confirmed. A step-wise heat change corresponding to consecutive stages of platinum lattice occupation by OH was observed. The amount of heat evolved on PtO formation was apparently larger than that on PtOH formation. The results were compared with those obtained by the voltammetric measurement.
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