TY - JOUR
T1 - Electrodeposition behaviour of cadmium telluride from 1-ethyl-3- methylimidazolium chloride tetrafluoroborate ionic liquid
AU - Hsiu, S. I.
AU - Sun, I. W.
N1 - Funding Information:
Funding was provided by the National Science Council of the Republic of China, Taiwan.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/10
Y1 - 2004/10
N2 - Voltammetry at a glassy carbon electrode was used to study the electrochemical deposition of Cd-Te from the Lewis basic 1-ethyl-3- methylimidazolium chloride/tetrafluoroborate air-stable room temperature ionic liquid between 80°C and 140°C. Deposition of tellurium alone occurs through a four-electron reduction of Te(IV) to Te which could be further reduced to Te(-II) at a more negative potential. The Cd-Te electrodeposits could be obtained by the underpotential deposition (UPD) of Cd on the deposited Te. The UPD of Cd on Te was, however, limited by a slow charge transfer rate. Samples of Cd-Te electrodeposits were prepared on tungsten and titanium substrates and characterized by energy dispersive spectroscope (EDS), scanning electron microscope (SEM), and X-ray powder diffraction (XRD). The results showed that an excess amount of Cd(II) was required in order to prepare CdTe codeposits with a Cd/Te atomic ratio approached 1/1. The deposit composition was independent of the deposition potential within the Cd UPD range. Raising the deposition temperature increased the UPD rate of Cd and promoted the formation polycrystalline CdTe.
AB - Voltammetry at a glassy carbon electrode was used to study the electrochemical deposition of Cd-Te from the Lewis basic 1-ethyl-3- methylimidazolium chloride/tetrafluoroborate air-stable room temperature ionic liquid between 80°C and 140°C. Deposition of tellurium alone occurs through a four-electron reduction of Te(IV) to Te which could be further reduced to Te(-II) at a more negative potential. The Cd-Te electrodeposits could be obtained by the underpotential deposition (UPD) of Cd on the deposited Te. The UPD of Cd on Te was, however, limited by a slow charge transfer rate. Samples of Cd-Te electrodeposits were prepared on tungsten and titanium substrates and characterized by energy dispersive spectroscope (EDS), scanning electron microscope (SEM), and X-ray powder diffraction (XRD). The results showed that an excess amount of Cd(II) was required in order to prepare CdTe codeposits with a Cd/Te atomic ratio approached 1/1. The deposit composition was independent of the deposition potential within the Cd UPD range. Raising the deposition temperature increased the UPD rate of Cd and promoted the formation polycrystalline CdTe.
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U2 - 10.1023/B:JACH.0000042670.84645.c5
DO - 10.1023/B:JACH.0000042670.84645.c5
M3 - Article
AN - SCOPUS:4944224863
SN - 0021-891X
VL - 34
SP - 1057
EP - 1063
JO - Journal of Applied Electrochemistry
JF - Journal of Applied Electrochemistry
IS - 10
ER -