Abstract
A thermocell that consists of cathode and anode materials with different temperature coefficients (α = dV/dT) of the redox potential (V) can convert environmental thermal energy to electric energy via the so-called thermal charging effect. The output voltage Vcell of the current thermocell, however, is still low (several tens mV) and depends on temperature, which are serious drawbacks for practical use of the device as an independent power supply. Here, we report that usage of phase transition material as electrode qualitatively improve the device performance. We set the critical temperature (Tc) for the phase transition in cobalt Prussian blue analogue (Co-PBA; NaxCo[Fe(CN)6]y) to just above room temperature, by finely adjusting the Fe concentration (y = 0.82). With increase in the cell temperature (Tcell), Vcell of the NaxCo[Fe(CN)6]0.82 (NCF82)/NaxCo[Fe(CN)6]0.9 (NCF90) cell steeply increases from 0 mV to ~120 mV around 320 K. Our observation indicates that the thermocell with use of phase transition is a promising energy harvesting device.
Highlights
For the ex situ X-ray powder diffraction (XRD), the magnitude of x of the NCF82 film was controlled by the charge/discharge process in a beaker-type cell
At (d) TL, the thermally-charged cell was discharged at 0.17 C
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Summary
The output voltage Vcell of the current thermocell, is still low (several tens mV) and depends on temperature, which are serious drawbacks for practical use of the device as an independent power supply. A semiconductor-based thermoelectric device that uses the so-called Seebeck effect is a promising technology and is practically used in Peltier cooling and thermal power generation in space vehicles[1] Another energy harvesting technology with low cost and high efficiency is the thermocell that consists of cathode and anode materials with different thermal coefficients (α = dV/dT) of the redox potential (V) between the anode (αanode) and cathode (αcathode) materials. Our observation indicates that the tertiary battery with use of phase transition is a promising independent power supply for the IT/ IoT devices. We note that the no phase transition is observed in the x region where qCT < 0.5 e/Co
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