Meroz Omer, Gelbstein Yaniv
Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.
Phys Chem Chem Phys. 2018 Feb 7;20(6):4092-4099. doi: 10.1039/c7cp06176e.
Eco-friendly renewable energy conversion methods are constantly investigated. Thermoelectric devices, directly converting thermal into electrical energy, show high potential for utilizing waste heat into useful electricity. Yet enhancing their efficiency is a challenging task. Below 300 °C, BiTeSe thermoelectric alloys are considered to be the most efficient for such applications. In the current research, by controlling the specific compositions and the synthesis route, optimizing the electron doping level and minimizing the lattice thermal conductivity values, very high thermoelectric figure of merit values were obtained beyond ∼170 °C. It is shown that upon combining the currently reported BiTeSe and BiTeSe alloys with previously reported highly efficient p- and n-type BiTe based compositions, a remarkable thermoelectric efficiency of ∼9.6% can be achieved for a relatively low temperature difference of 250 °C.
人们一直在研究环保型可再生能源转换方法。热电装置可直接将热能转化为电能，在将废热转化为有用电能方面具有很高的潜力。然而，提高其效率是一项具有挑战性的任务。在300℃以下，BiTeSe热电合金被认为是此类应用中效率最高的。在当前的研究中，通过控制特定的成分和合成路线，优化电子掺杂水平并最小化晶格热导率值，在超过约170℃时获得了非常高的热电优值。结果表明，将目前报道的BiTeSe和BiTeSe合金与先前报道的高效p型和n型BiTe基成分相结合，在250℃的相对低温差下可实现约9.6%的显著热电效率。
