Pulse electrodeposited bismuth-tellurium superlattices with controllable bismuth content

JOURNAL OF POWER SOURCES

卷:450

Article

Bakavets, Aliaksei^1,2  Aniskevich, Yauhen^1,2  Yakimenko, Oleg²  Jo, Jae Hyeon³  Vernickaite, Edita⁴  Tsyntsaru, Natalia⁴  Cesiulis, Henrikas⁴  Kuo, Liang-Yin^5,6  Kaghazchi, Payam⁶  Ragoisha, Genady¹  Myung, Seung-Taek³  Streltsov, Eugene² 

[1] Belarusian State Univ, Res Inst Phys Chem Problems, Minsk 220006, BELARUS

[2] Belarusian State Univ, Fac Chem, Minsk 220030, BELARUS

[3] Sejong Univ, Dept Nano Technol & Adv Mat Engn, Seoul 05006, South Korea

[4] Vilnius Univ, Fac Chem, Dept Phys Chem, Vilnius, Lithuania

[5] Free Univ Berlin, Inst Chem & Biochem, Phys & Theoret Chem, Takustr 3, D-14195 Berlin, Germany

[6] Forschungszentrum Julich, Inst Energy & Climate Res IEK 1, Mat Synth & Proc, Wilhelm Johnen Str, D-52425 Julich, Germany

关键词: Bismuth telluride;    Bismuth;    Superlattice;    Thermoelectric materials;    Electrodeposition;   

DOI  :  10.1016/j.jpowsour.2019.227605

来源: Elsevier

【 摘 要 】

Superlattice structures of (Bi-2)(m)(Bi2Te3)(n) series with controllable Bi mole fraction from 0.41 to 0.71 are electrodeposited in pulse potentiostatic mode from acidic electrolytes containing Bi(NO3)(3) and TeO2 as precursors. Two valence states of bismuth in superlattices are identified by X-ray photoelectron spectroscopy (XPS). One of those states is attributed to interlayered Bi which is present in (Bi-2)m(Bi2Te3)n superlattice in the form of biatomic layers between bismuth telluride quintuples. X-ray difraction (XRD) analysis and density functional theory (DFT) calculations indicate an increase in subcell parameter a. d, and decrease in subcell parameter csig, with the increase of Bi mole fraction. Biatomic layers of Bi are identified with cyclic voltammetry by characteristic anodic peak between potentials of metallic bismuth and Bi2Te3 oxidation. The selective oxidation of Bi-bilayers in (Bi-2)m(Bi2Te3)n superlattice at the potential of the anodic peak results in the product corresponding to Bi2Te3 by stoichiometry, but having an expanded crystal structure. Superlattices with controllable Bi mole fraction and Bi2Te3 with memory effect may be of interest for design of new thermoelectric materials with controllable parameters.

【 授权许可】

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