Abstract
Abstract Semiconductor-sensitised thermal cells (STC) are a new type of thermal energy conversion system that makes effective use of waste heat even at low-temperature. This system generates electricity via the redox reactions of electrolyte ions caused by thermally-excited carriers in the semiconductor electrode. However, there has been no direct proof of the redox reactions. In this manuscript, these reactions were directly observed via the change in colour of copper electrolyte ions, depending on their valence. This observation indicated that the oxidation reaction occurred at the semiconductor electrode and the reduction reaction occurred at the counter electrode, as we expected. These results will lead to the clarification of the principles and improvement of the STC performance.
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