Electrochemical behavior of ruthenium-hexacyanoferrate modified glassy carbon electrode and catalytic activity towards ethanol electrooxidation

Journal of the Brazilian Chemical Society

Costa, Wendell M.¹  Research Council of Canada, Vancouver, Canada¹  Marques, Edmar P.¹  Zhang, Jiujun¹  Ferreira, Antonio Ap. P.¹  Federal University of Maranhão, São Luis, Brazil¹  Cardoso, William S.¹  Marques, Aldaléa L. B.¹  Song, Chaojie¹  State University of São Paulo, Araraquara, Brazil¹  Bezerra, Cicero W. B.¹ 

关键词: ethanol sensor;    ruthenium-hexacyanoferrate;    cyclic voltammetry;    chronoamperometry;    electrochemical impedance;   

DOI  :  10.5935/0103-5053.20130082

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

Ruthenium-based hexacyanoferrate (RuHCF) thin film modified glassy carbon electrode was prepared by drop evaporation method. The RuHCF modified electrode exhibited four redox couples in strong acidic solution (pH 1.5) attributed to Fe(CN)63- ion and three ruthenium forms (Ru(II), Ru(III) and Ru(IV)), characteristic of ruthenium oxide compounds. The modified electrode displayed excellent electrocatalytic activity towards ethanol oxidation in the potential region where electrochemical processes Ru(III)-O-Ru(IV) and Ru(IV)-O-Ru(VI) occur. Impedance spectroscopy data indicated that the charge transfer resistance decreased with the increase of the applied potential and ethanol concentration, indicating the use of the RuHCF modified electrode as an ethanol sensor. Under optimized conditions, the sensor responded linearly and rapidly to ethanol concentration between 0.03 and 0.4 mol L-1 with a limit of detection of 0.76 mmol L-1, suggesting an adequate sensitivity in ethanol analyses.

【 授权许可】

Unknown