Electrodeposition of bismuth telluride thermoelectric films from a nonaqueous electrolyte using ethylene glycol
article
Ethylene glycol was studied as an electrolyte for the electrodeposition of thermoelectric bismuth telluride films by cyclic voltammetry, rotating ring disk electrode and electrochemical quartz crystal microbalance (EQCM). The reduction of both Bi3+ and Te4+ ions proceeds in one step without the formation of intermediates at potentials more negative than +0.2 V and +0.55 V vs. SHE, respectively. The diffusion coefficients and the rate constants for reduction were found to be similar for Bi and Te. Stoichiometric Bi2Te3 films with a uniform composition profile were obtained from solutions containing up to 1 M of Bi(NO3)3 and TeCl4, at current densities up to 5 A dm-2 (∼102 μm h-1). Both p- and n-type bismuth telluride films could be obtained, as confirmed by Seebeck coefficient measurements. © 2012 Elsevier Ltd. All rights reserved.
Topics
Bismuth tellurideElectrodepositionEthylene glycolHigh rateThermoelectricBismuth tellurideComposition profileElectrochemical quartz crystal microbalanceHigh rateNon-aqueous electrolytesOne stepRotating ring-disk electrodeSeebeck coefficient measurementThermoelectricThermoelectric filmBismuth compoundsCyclic voltammetryElectrodepositionElectrolytesEthylene glycolRate constantsReduction
TNO Identifier
461321
ISSN
00134686
Source
Electrochimica Acta, 68, pp. 9-17.
Pages
9-17
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