High-Performance and Stable (Ag, Cd)-Containing ZnSb Thermoelectric Compounds
High-Performance and Stable (Ag, Cd)-Containing ZnSb Thermoelectric Compounds
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高性能、稳定的含（Ag、Cd）ZnSb 热电化合物
DOI：
10.1021/acsami.2c03304
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Chen Lidong
中科院分区：
文献类型：
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作者：
Yang Sai;Deng Tingting;Qiu Pengfei;Xing Tong;Cheng Jun;Jin Zhicheng;Li Peng;Shi Xub;Chen Lidong
ZnSb和Zn_4Sb_3是一类廉价、资源丰富的锌锑基热电材料。然而，长期以来，它们的真实的应用受到ZnSb的低TE优值（zT）和Zn 4Sb 3的差热力学稳定性的限制。在这项研究中，我们成功地整合了高zT和良好的稳定性（银，镉）含ZnSb化合物。在ZnSb中合金化Cd极大地抑制了晶格热导率，在300 K时达到最小值0.97 W K-1 m-1，而掺杂Ag显著地提高了功率因数，在500 K时达到峰值17.7 μW cm-1 K-2，并降低了双极热导率。作为同时优化的电和热传输的结果，峰值zT为1.2，实现为Zn0.698Ag0.002Cd0.3Sb在600 K，这是与Zn 4Sb 3基化合物报道的最佳值相媲美。此外，电流应力测试证实，引入Ag和Cd不会降低ZnSb在电场下的良好稳定性。Zn0.698Ag0.002Cd0.3Sb的相组成和热电性能即使在50 A cm-2的高电流密度下也没有改变，显示出比Zn 4Sb 3更好的稳定性。该研究将促进ZnS基化合物在余热回收领域的真实的应用。
Binary Zn-Sb-based compounds, ZnSb and Zn4Sb3, are promising thermoelectric (TE) materials because they are low-cost and earth-abundant. However, for a long time, their real applications have been limited by the low TE figure-of-merit (zT) of ZnSb and poor thermodynamic stability of Zn4Sb3. In this study, we successfully integrate both high zT and good stability in (Ag, Cd)-containing ZnSb compounds. Alloying Cd in ZnSb greatly suppresses the lattice thermal conductivity to a minimum value of 0.97 W K-1 m-1 at 300 K, while doping Ag significantly enhances the power factor to a peak value of 17.7 μW cm-1 K-2 at 500 K and reduces the bipolar thermal conductivity. As a result of the simultaneously optimized electrical and thermal transport, a peak zT of 1.2 is achieved for Zn0.698Ag0.002Cd0.3Sb at 600 K, which is comparable with the best values reported for Zn4Sb3-based compounds. Moreover, a current stress test confirms that introducing Ag and Cd does not degrade the good stability of ZnSb under an electric field. The phase composition and thermoelectric performance of Zn0.698Ag0.002Cd0.3Sb are not changed even under a high current density of 50 A cm-2, showing much better stability than Zn4Sb3. This study would accelerate the real application of ZnSb-based compounds in the field of waste heat harvesting.