He Jiangjing, Al-Masri Danah, MacFarlane Douglas R, Pringle Jennifer M
ARC Centre of Excellence for Electromaterials Science, Institute for Frontier Materials, Deakin University, 221 Burwood Highway, Burwood, VIC 3125, Australia.
School of Chemistry, Monash University, Wellington Road, Clayton, VIC 3800, Australia.
Faraday Discuss. 2016 Aug 15;190:205-18. doi: 10.1039/c5fd00238a.
Increasing the application of technologies for harvesting waste heat could make a significant contribution to sustainable energy production. Thermoelectrochemical cells are one such emerging technology, where the thermal response of a redox couple in an electrolyte is used to generate a potential difference across a cell when a temperature gradient exists. The unique physical properties of ionic liquids make them ideal for application as electrolytes in these devices. One of the keys to utilizing these media in efficient thermoelectrochemical cells is achieving high Seebeck coefficients, Se: the thermodynamic quantity that determines the magnitude of the voltage achieved per unit temperature difference. Here, we report the Se and cell performance of a cobalt-based redox couple in a range of different ionic liquids, to investigate the influence of the nature of the IL on the thermodynamics and cell performance of the redox system. The results reported include the highest Se to-date for an IL-based electrolyte. The effect of diluting the different ILs with propylene carbonate is also reported, which results in a significant increase in the output powers and current densities of the device.
增加废热回收技术的应用可为可持续能源生产做出重大贡献。热电化学电池就是这样一种新兴技术，当存在温度梯度时，电解质中氧化还原对的热响应被用于在电池两端产生电位差。离子液体独特的物理性质使其成为这些装置中电解质的理想选择。在高效热电化学电池中利用这些介质的关键之一是实现高塞贝克系数（Se）：这个热力学量决定了每单位温差所产生的电压大小。在此，我们报告了钴基氧化还原对在一系列不同离子液体中的塞贝克系数和电池性能，以研究离子液体性质对氧化还原体系热力学和电池性能的影响。报告的结果包括基于离子液体的电解质迄今最高的塞贝克系数。还报告了用碳酸丙烯酯稀释不同离子液体的效果，这导致装置的输出功率和电流密度显著增加。
