Abstract This work presents a systematic assessment of electrochemical responses of n-type bismuth telluride-based thermoelectric materials in NaCl solutions. A single-phase alloy and a nanocomposite (with embedded MoS2 nanoparticles) produced by means of mechanical alloying and hot extrusion were investigated. The polarization and electrochemical impedance spectroscopy tests in NaCl solutions revealed that the passivity of the nanocomposite specimen was considerably improved compared with the coarse-grained single-phase alloy. Mott–Schottky analysis revealed that passive layers of both single-phase alloy and nanocomposite specimens had an n-type semiconducting behavior, and the donor density reduced in the passive layer of the nanocomposite specimen.

中文翻译：

---

n型碲化铋基热电材料在NaCl溶液中的电化学响应：单相合金与含MoS 2 纳米颗粒的纳米复合材料的比较

摘要 这项工作系统地评估了 n 型碲化铋基热电材料在 NaCl 溶液中的电化学响应。研究了通过机械合金化和热挤压生产的单相合金和纳米复合材料（嵌入 MoS2 纳米颗粒）。在 NaCl 溶液中的极化和电化学阻抗谱测试表明，与粗晶单相合金相比，纳米复合材料试样的钝化性得到了显着提高。Mott-Schottky 分析表明，单相合金和纳米复合材料样品的钝化层都具有 n 型半导体行为，并且纳米复合材料样品的钝化层中的施主密度降低。