Abstract
Temperature dependence on the electro-oxidation of methanol, ethanol and 1-propanol in 0·5 M H2SO4 were investigated with Pt and PtRu electrodes. Tafel slope and apparent activation energy were evaluated from the cyclic voltammetric data in the low potential region (0·3–0·5 V vs SHE). The CV results provided Tafel slopes for alcohols in the range of 200–400 mV dec−1 which indicated a difference in the rate determining step. The decrease in Tafel slope was only observed in the case of methanol for the Ru-modified Pt electrode. This indicates that Ru improves the rate of determining step for methanol while hindering it for the other alcohols. The electrochemical impedance spectroscopy was also used to evaluate the electro-oxidation mechanism of alcohols on these electrodes. The simulated EIS results provided two important parameters: charge transfer resistance (R ct ) and inductance (L). The R −1 ct and L −1 represent the rate of alcohol electro-oxidation and rate of desorption of intermediate species, respectively. These values increased with the increasing of temperature. The results from two techniques were well agreed that the electro-oxidation of methanol was improved by raising the temperature and ruthenium modification.
Similar content being viewed by others
References
Gupta S S and Datta J 2006 J. Electroanal. Chem. 594 65
Zhou W J et al 2004 J. Power Sources 126 16
Wu G, Li L and Xu B-Q 2004 Electrochim. Acta 50 1
Otomo J, Li X, Kobayashi T, Wen C-J, Nagamoto H and Takahashi H 2004 J. Electroanal. Chem. 573 99
Lamy C, Lima A, LeRhun V, Delime F, Coutanceau C and Léger J-M 2002 J. Power Sources 105 283
Song S, Zhou W, Liang Z, Cai R, Sun G, Xin Q, Stergiopoulos V and Tsiakaras P 2005 Appl. Catal. B: Environmental 55 65
Liu H, Song C, Zhang L, Zhang J, Wang H and Wilkinson D P 2006 J. Power Sources 155 95
Dubau L, Hahn F, Coutanceau C, Léger J-M and Lamy C 2003 J. Electroanal. Chem. 554-555 407
Léger J-M, Rousseau S, Coutanceau C, Hahn F and Lamy C 2005 Electrochim. Acta 50 5118
Waszczuk P, Wieckowski A, Zelenay P, Gottesfeld S, Coutanceau C, Léger J-M and Lamy C 2001 J. Electroanal. Chem. 511 55
Lee C-G, Umedab M and Uchida I 2006 J. Power Sources 160 78
Burstein G T, Barnett C J, Kucenak A R and Williams K R 1997 Catal. Today 38 425
Schmidt V M, Ianniello R, Pastor E and González S 1996 J. Phys. Chem. 100 17901
Colmati F, Antolini E and Gonzalez E R 2006 J. Power Sources 157 98
Rodrigues IdA, Souza J P I D, Pastor E and Nart F C 1997 Langmuir 13 6829
Pastor E, Wasmus S, Iwasita T, Arévalo S MCGl and Arvia A J 1993 J. Electroanal. Chem. 350 97
Gojković SLj, Vidaković T R and Durović D R 2003 Electrochim. Acta 48 3607
Chakraborty D, Chorkendorff I and Johannessen T 2006 J. Power Sources 162 1010
Hsing I-M, Wang X and Leng Y-J 2002 J. Electrochem. Soc. 149 A615
Ciureanu M, Wang H and Qi Z 1999 J. Phys. Chem. B103 9645
Kabbabi A, Faure R, Durand R, Beden B, Hahn F, Léger J-M and Lamy C 1998 J. Electroanal. Chem. 444 41
Vigier F, Gloaguen F, Léger J-M and Lamy C 2001 Electrochim. Acta 46 4331
Ratana T 2005 The mechanistic study of the electrooxidation reaction of small organic molecules on modified Pt electrodes by electrochemical impedance spectroscopy and other techniques (Ph.D. Dissertation). Mahidol University, Bangkok, Thailand
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Katikawong, P., Ratana, T. & Veerasai, W. Temperature dependence studies on the electro-oxidation of aliphatic alcohols with modified platinum electrodes. J Chem Sci 121, 329–337 (2009). https://doi.org/10.1007/s12039-009-0038-3
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12039-009-0038-3