Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan.
Center for Molecular Systems, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan.
ChemSusChem. 2019 Sep 6;12(17):4014-4020. doi: 10.1002/cssc.201901566. Epub 2019 Aug 7.
Thermocells convert waste heat to electricity without any pollution; however, the high cost and corrosivity of redox species hinder their commercialization. In this work, a thermocell that utilizes abundant polysulfide as redox species was demonstrated for the first time. 1-Butyl-1-methylpyrrolidinium polysulfide [(P ) S ] was synthesized, and the redox species were prepared by the addition of sulfur to the (P ) S solution in DMSO. In thermoelectric measurements, the Seebeck coefficient changed from -0.68 to +0.5 mV K through addition of sulfur to the cell. Operando UV/Vis spectroscopy and open-circuit voltage analysis revealed that this effect was attributed to the change in the dominating redox reactions by the addition of sulfur. This result also provides a thermodynamic view on polysulfides electrochemistry, which is of high importance for lithium-sulfur batteries.
热能电池可将废热转化为电能，且无污染；然而，氧化还原物质的高成本和腐蚀性阻碍了其商业化。在这项工作中，首次展示了一种利用丰富的多硫化物作为氧化还原物质的热能电池。合成了 1-丁基-1-甲基吡咯烷多硫化物[(P ) S ]，并通过向 DMSO 中的 (P ) S 溶液中添加硫来制备氧化还原物质。在热电测量中，通过向电池中添加硫，Seebeck 系数从-0.68 变为+0.5 mV K 。原位 UV/Vis 光谱和开路电压分析表明，这种效应归因于添加硫后主导氧化还原反应的变化。这一结果还为硫属元素电化学提供了热力学观点，这对锂硫电池具有重要意义。
