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Publication . Article . 2020

Pulse electrodeposited bismuth-tellurium superlattices with controllable bismuth content

Aliaksei Bakavets; Yauhen Aniskevich; Oleg Yakimenko; Jae Hyeon Jo; Edita Vernickaite; Natalia Tsyntsaru; Henrikas Cesiulis; +5 Authors
Open Access
Abstract

Superlattice structures of (Bi2)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 Bi0 which is present in (Bi2)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 asub and decrease in subcell parameter csub with the increase of Bi mole fraction. Biatomic layers of Bi0 are identified with cyclic voltammetry by characteristic anodic peak between potentials of metallic bismuth and Bi2Te3 oxidation. The selective oxidation of Bi-bilayers in (Bi2)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

This is a post-peer-review, pre-copyedit version of an article published in Journal of Power Sources. The final authenticated version is available online at: https://doi.org/10.1016/j.jpowsour.2019.227605

Subjects by Vocabulary

Dewey Decimal Classification: ddc:620

Microsoft Academic Graph classification: Mole fraction Valence (chemistry) Superlattice X-ray photoelectron spectroscopy Bismuth chemistry.chemical_element chemistry Materials science Thermoelectric materials Analytical chemistry Bismuth telluride chemistry.chemical_compound Tellurium

Subjects

Bismuth telluride; bismuth; superlattice; thermoelectric materials; electrodeposition, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Energy Engineering and Power Technology, Renewable Energy, Sustainability and the Environment

Funded by
EC| SMARTELECTRODES
Project
SMARTELECTRODES
Multiscaled Smart Metallic and Semiconductor Electrodes for Electrochemical Processing and Devices
  • Funder: European Commission (EC)
  • Project Code: 778357
  • Funding stream: H2020 | MSCA-RISE
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