Role of the ions in the Ge/(CuCl, CuCl2 and LiCl)/FTO-sensitized thermal cell

Ikeda, Takumi; Sekiya, Hayato; Kohata, Haruki; Isobe, Toshihiro; Nakajima, Akira; Matsushita, Sachiko

doi:10.1016/j.jelechem.2021.115413

Cited by 5 publications

(12 citation statements)

References 17 publications

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“…The chemical reactions that may cause the voltage fluctuations are as follows: Primarily, reaction 2 occurred at the electrode/electrolyte interface and generated electric power. Meanwhile, it has been previously reported that PEG, the solvent of the electrolyte in this system, exhibits a reducing effect on Cu 2+ under the applied voltage. , Reactions 3 and 4 might occur in the bulk electrolyte as a result of the electric field during discharging. These complicated reactions may be the origin of the fluctuations of the Cu + and Cu 2+ concentrations.…”

Section: Resultsmentioning

confidence: 65%

“…The equivalent circuit was constructed using two reference cells: the FTO reference cell and the Ge reference cell (Figure S4 of the Supporting Information) . On the basis of the frequency of the semicircle peak of each Cole–Cole plot, the frequencies of the FTO/electrolyte and Ge/electrolyte interfaces were decided in the order of 10 3 and 10 1 Hz, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…There are two approaches to calculate ion diffusion length l D from the alternating current (AC) impedance: one using peak frequencies in Cole–Cole plots , and another from Warburg impedance …”

Section: Resultsmentioning

confidence: 99%

“…Ge is a water-labile material. Thus, the electrolyte was prepared in a flow-type glovebox, coupled with a circulation/purification machine, and filled with Ar (the oxygen concentration was 0.2–0.5 ppm) . Before reagents were used in the glovebox, they were vacuumed at 80 °C for 15 h in a side box.…”

Section: Methodsmentioning

confidence: 99%

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Electrolyte Thickness Dependence upon Ge-Sensitized Thermal Cells

Kohata

Mei²,

Wang³

et al. 2022

Energy Fuels

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The semiconductor-sensitized thermal cell (STC) is an attractive technology that used low-temperature heat (<200 °C). STC generates electricity by the redox reactions of electrolyte ions with thermally excited carriers in semiconductors. The most valuable feature of the STC is that, after power generation was completed, the performance recovers by leaving the cell in the heat source. However, the reason for this restore has been unclear. In this study, the recovery phenomenon was investigated with the viewpoint of electrolyte thickness. As a result, the cell with the thinnest thickness and smallest quantity of electrolyte discharged for the longest time, with faster recovery and better discharge characteristics. These consequences clearly demonstrated the difference between primary batteries and STCs.

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Section: Resultsmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Electrolyte Thickness Dependence upon Ge-Sensitized Thermal Cells

Kohata

Mei²,

Wang³

et al. 2022

Energy Fuels

Self Cite

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show abstract

“…Among these appealing energies, we focus on the thermal energy always present in the human range of action. 5) Semiconductor-sensitized thermal cells (STCs) [6][7][8][9][10][11][12][13][14] have previously been proposed as a new thermal energy conversion technology based on the mechanism of dye-sensitized solar cells (DSSCs). [15][16][17][18] STCs generate electricity by the redox reaction of electrolyte ions by thermally excited charges in a semiconductor (Fig.…”

Section: Introductionmentioning

confidence: 99%

Counter electrode dependence of germanium-sensitized thermal cells

Tamaki,

Matsushita

2023

Jpn. J. Appl. Phys.

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Semiconductor-sensitized thermal cells (STCs), which generate electricity by converting the photoexcitation of dyes in a dye-sensitized solar cell (DSSC) into thermal excitation in a semiconductor, have attracted attention as a new thermal energy conversion technology. This paper examines the role of the counter electrode on the STC battery characteristics. The results suggest that, similar to DSSCs, the chemical stability, surface resistance, and electron transfer resistance at the counter electrode/electrolyte interface affect the performance of STCs. The similarities between STC and DSSC partly shown in this manuscript indicate that the scientific arguments of DSSC may be applicable to the STC discussion.

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In-Situ Observation of Redox Reactions in Ge-Sensitised Thermal Cells

Hida

Isobe

Nakajima

et al. 2022

Bulletin of the Chemical Society of Japan

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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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Role of the ions in the Ge/(CuCl, CuCl2 and LiCl)/FTO-sensitized thermal cell

Cited by 5 publications

References 17 publications

Electrolyte Thickness Dependence upon Ge-Sensitized Thermal Cells

Electrolyte Thickness Dependence upon Ge-Sensitized Thermal Cells

Counter electrode dependence of germanium-sensitized thermal cells

In-Situ Observation of Redox Reactions in Ge-Sensitised Thermal Cells

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