Structural And Electrochemical Characterization Of A Cobalt Phthalocyanine Bulk-modified Sio2/sno2 Carbon Ceramic Electrode

A cobalt phthalocyanine bulk-modified carbon ceramic composite has been prepared by using sol-gel processing, and characterized by BET surface area, X-ray photoelectron spectroscopy, scanning electron microscopy and atomic force microscopy. A water-soluble 3-n-propylpyridinium chloride silsesquioxane (SiPyCl), an ion exchanger polymer, was employed to attach cobalt(II) tetrasulfophthalocyanine (CoTsPc) and prevent its leakage, as well as, to ensure adequate dispersion in the sol-gel network. The modified electrode built in a rigid disk-format displayed good electrocatalytic behavior towards the oxidation of oxalic acid at 0.84 V (SCE), as evidenced by the enhancement of the anodic current peak intensity when the concentration of oxalic acid was increased. A linear response was found in the range of 1.6 × 10-5 to 1.5 × 10-3 mol l-1 with a detection limit of 7.1 × 10-6 mol l-1. © 2008 Elsevier Ltd. All rights reserved.54719481953Tsionsky, M., Gun, G., Giezer, V., Lev, O., (1994) Anal. Chem., 66, p. 1747Yang, Z., Wang, P., Zhang, W., Zhu, G., (2001) Fresenius J. Anal. Chem., 371, p. 337Salimi, A., Pourbeyram, S., Amini, M.K., (2002) Analyst, 127, p. 1649Oskam, G., Searson, P.C., (1998) J. Phys. Chem. B, 102, p. 2464Maroneze, C.M., Arenas, L.T., Luz, R.C.S., Benvenutti, E.V., Landers, R., Gushikem, Y., (2008) Electrochim. Acta, 53, p. 4167Arguello, J., Magosso, H.A., Landers, R., Gushikem, Y., (2008) J. Electroanal. Chem., 617, p. 45Marafon, E., Lucho, A.M.S., Francisco, M.S.P., Landers, R., Gushikem, Y., (2006) J. Bras. Chem. Soc., 17 (8), p. 1605Yuan, Y., Wang, P., Zhu, G., (2002) Anal. Bioanal. Chem., 372, p. 712Wang, J., (1999) Anal. Chim. Acta, 399, p. 21Salimi, A., Pourbeyram, S., (2003) Talanta, 60, p. 205Wang, P., Yuan, Y., Wang, X., Zhu, G., (2000) J. Electroanal. Chem., 493, p. 130Rohlfing, D.F., Rathousky, J., Rohlfing, Y., Bartels, O., Wark, M., (2005) Langmuir, 21, p. 11320Thenmozhi, K., Narayanan, S.S., (2007) Biosens. Bioelectron., 23, p. 606Salimi, A., Compton, R.G., Hallaj, R., (2004) Anal. Biochem., 333, p. 49Baker, P.G.L., Sanderson, R.D., Crouch, A.M., (2007) Thin Solid Films, 515, p. 6691Cardoso, W.S., Francisco, M.S.P., Lucho, A.M.S., Gushikem, Y., (2004) Solid State Ionics, 167, p. 165Weber, M.J.H., Busch, D.H., (1965) Inorg. Chem., 4, p. 469Gushikem, Y., Alfaya, R.V.S., Alfaya, A.A.S., Brazilian Patent, INPI 9,803,053-A, 1998Moulder, J., Stickle, W.F., Sobol, P.E., Bomben, K.D., (1992) Handbook of X-ray Photoelectron Spectroscopy, , Perkin-Elmer Corp., MNCirera, A., Cornet, A., Morante, J.R., Olaizola, S.M., Castaño, E., Gracia, J., (2000) Mater. Sci. Eng. B, 69-70, p. 406Vasconcelos, J.S., Vasconcelos, N.S.L.S., Orlandi, M.O., Bueno, P.R., Varela, J.A., Longo, E., Barrado, C.M., Leite, E.R., (2006) Appl. Phys. Lett., 89, p. 152102Zagal, J., Sen, R.K., Yeager, E., (1977) J. Electroanal. Chem., 83, p. 207(1994) Cyclic Voltammetry, , Gosser D.K. (Ed), VCH, New YorkLucho, A.M.S., Oliveira, E.C., Pastore, H.O., Gushikem, Y., (2004) J. Electroanal. Chem., 573, p. 55Canevari, T.C., Arguello, J., Francisco, M.S.P., Gushikem, Y., (2007) J. Electroanal. Chem., 609, p. 6