Title :
Investigation on the electrochemical reduction process of HTeO2+ on Au substrate
Author :
Li, Feihui ; Wang, Wei
Author_Institution :
Dept. of Appl. Chem., Tianjin Univ., Tianjin
Abstract :
The electrochemical reduction mechanism of tellurium on Au substrate from nitric acid solution containing HTeO2 + ion was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The analyses indicated that the reduction of HTeO2 + on Au substrate was an irreversible multi-step process and both HTeO2 + ion and its intermediate product HTeO+ ion could all adsorb on Au substrate. The entire reduction process of tellurium on Au substrate can be considered as follows: 1) the initial electrochemical reactions: HTeO2 + (diss)+2e-+2H+rarrHTeO+ (ads) +H2O, HTeO2 + (ads)+2e-+2H+ rarr HTeO+ (ads)+H2O, HTeO+ (ads) +2e-+H+ rarr Te+H2O; 2) the following chemical reactions: HTeO2+(diss) + Te + H+rarr2HTeO+ (diss), HTeO+ (diss) + Te+ H2O rarr 2TeO- (diss)+3H+, 3) the subsequently electrochemical reactions: HTeO+ (diss) + 2e-+ H+rarrTe+H2O, TeO- (diss)+ e-+ 2H+ rarrTe+H2O.
Keywords :
adsorption; electrochemical impedance spectroscopy; gold; hydrogen compounds; reduction (chemical); voltammetry (chemical analysis); Au; HTeO2; HTeO2 +; adsorption; cyclic voltammetry; electrochemical impedance spectroscopy; electrochemical reduction mechanism; nitric acid solution; Bismuth; Chemical analysis; Chemistry; Electrochemical impedance spectroscopy; Electrodes; Electrons; Gold; Oxidation; Tellurium; Thermoelectricity;
Conference_Titel :
Thermoelectrics, 2007. ICT 2007. 26th International Conference on
Conference_Location :
Jeju Island
Print_ISBN :
978-1-4244-2262-3
Electronic_ISBN :
1094-2734
DOI :
10.1109/ICT.2007.4569443
