Supramolecular Thermo-Electrochemical Cells: Enhanced Thermoelectric Performance by Host-Guest Complexation and Salt-Induced Crystallization
Supramolecular Thermo-Electrochemical Cells: Enhanced Thermoelectric Performance by Host-Guest Complexation and Salt-Induced Crystallization
复制标题
DOI：
10.1021/jacs.6b04923
复制
发表时间：
2016-08-24
影响因子：
15
通讯作者：
Kimizuka, Nobuo
中科院分区：
文献类型：
--
作者：
Zhou, Hongyao;Yamada, Teppei;Kimizuka, Nobuo
热电化学电池具有产生比半导体材料高1个数量级的热电电压的潜力。为了克服热电能量转换中的当前问题，最重要的是发展和实现热电化学电池的全部潜力。在这里，我们报告了一个合理的超分子方法，产生了最高的塞贝克系数约。2.0 mV K-1（环境温度附近）。这是基于三碘离子在α-环糊精中的包封，其平衡在较低温度下向络合转移，而在升高的温度下反转。这种温度依赖性的主客体相互作用在两个电极之间提供了氧化还原离子对的浓度梯度，从而导致热电化学电池的优异性能。该系统的品质因数zT达到了5 x 10（-3）的高值。因此，将主客体化学引入热电电池提供了热电能量转换的新视角。
Thermo-electrochemical cells have potential to generate thermoelectric voltage 1 order higher than that given by semiconductor materials. To overcome the current issues in thermoelectric energy conversion, it is of paramount importance to grow and fulfill the full potential of thermo-electrochemical cells. Here we report a rational supramolecular methodology that yielded the highest Seebeck coefficient of ca. 2.0 mV K-1 around ambient temperatures. This is based on the encapsulation of triiodide ions in alpha-cyclodextrin, whose equilibrium is shifted to the complexation at lower temperatures, whereas it is inverted at elevated temperatures. This temperature-dependent host-guest interaction provides a concentration gradient of redox ion pairs between two electrodes, leading to the eminent performance of the thermo-electrochemical cells. The figure of merit for this system, zT reached a high value of 5 x 10(-3). The introduction of host-guest chemistry to thermoelectric cells thus provides a new perspective in thermoelectric energy conversion.