[17a-F102-1~12] 9.4 Thermoelectric conversion

[17a-F102-5] Development and evaluation of battery-type thermocell fabricated with Prussian blue analogues

〇Takayuki Shibata¹, Yuya Fukuzumi², Wataru Kobayashi^2,3, Yutaka Moritomo^2,3 (1.NIT, Gunma College, 2.Univ.of Tsukuba, 3.TREMS, Univ. of Tsukuba)

Keywords:Prussian blue analogues, Thermal power generation, Sodium-ion secondary battery

We demonstrated that a sodium-ion secondary battery type thermocell consisting of two kinds of Prussian blue analogues (PBAs) with different electrochemical themoelectric coefficients produces electrical energy during heat cycles. The device produces an electrical energy of 2.3 meV/PBA per heat cycle between 295 K and 323 K. We found that the ideal thermal eficiency, which is evaluated using the heat capacity (C = 4.16 meV/K) of ideal Na₂Co[Fe(CN)₆], is 1.0 %. This value reaches 11 % of the Carnot efficiency (8.7 %).