Artículos de revistas
Tin(iv) Oxide Grafted On A Silica Gel Surface As A Conducting Substrate Base For Cupric Hexacyanoferrate
Registro en:
Journal Of Electroanalytical Chemistry. , v. 318, n. 1-2, p. 247 - 254, 1991.
220728
10.1016/0022-0728(91)85307-B
2-s2.0-0026256873
Autor
Zaldivar G.A.P.
Gushikem Y.
Kubota L.T.
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Tin(IV) oxide grafted on a silica gel surface, ( SiO)nSn(OH)4-n, was used as a conducting substrate base for cupric hexacyanoferrate electroactive species. The film adhered strongly to the surface and exhibited good chemical stability. The mid-point potential of the redox reaction ST-Cu[FeIII(CN)6] + M+ + e- ⇋ ST-MCu[FeII(CN)6] where M K+, NH+ 4, Na+, Li+ and ST denotes tin(IV) oxide substrate on silica gel surface, is related to the facility that the cation moves into and out of the film during reduction and oxidation respectively. The cyclic voltammetry waves for Li+ and Na+ were broadened, suggesting that the diffusion of these cations at the film-solution interface is hindered due to the larger hydrated ionic radii of these cations compared with those of K+ and NH+ 4. The symmetry of the cyclic voltammetry waves with respect to the potential axis indicated a highly reversible character of the redox reactions: Ipa/Ipc≈1 where Ipa and Ipc are the anodic and cathodic peak currents respectively. The film behavior was quasi-Nernstian since the slope of the straight line obtained by plotting -log (electrolyte concentration) against the mid-point potential was 46 mV per decade change of concentration of electrolyte. © 1992. 318 1-2 247 254 #2011/16174-2; FAPESP; São Paulo Research Foundation Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Ellis, Eckoff, Neff, (1981) J. Phys. Chem., 85, p. 1225 Itaya, Akahoshi, Tashima, (1982) J. Electrochem. Soc., 129, p. 1498 Siperko, Kuwana, Electrochemical and Spectroscopic Studies of Metal Hexacyanometalate Films (1983) Journal of The Electrochemical Society, 130, p. 396 Siperko, Kuwana, (1986) J. Electrochem. Soc., 133, p. 2439 Cumbliss, Lugg, Morosoff, Alkali metal cation effects in a Prussian blue surface modified electrode (1984) Inorganic Chemistry, 23, p. 4701 Humphrey, Sinha, Bocarsly, (1984) J. Phys. Chem., 88, p. 736 Engel, Grabner, Copper Hexacyanoferrate-Modified Glassy Carbon: A Novel Type of Potassium-Selective Electrode (1985) Berichte der Bunsengesellschaft für physikalische Chemie, 89, p. 898 Siperko, Kuwana, (1987) Electrochim. Acta, 32, p. 765 Dong, Jin, (1988) J. Electroanal. Chem., 256, p. 193 Kulesza, Galus, (1989) J. Electroanal. Chem., 267, p. 117 Jiang, Zhan, Zao, (1990) J. Electroanal. Chem., 287, p. 389 Carpenter, Conell, Simko, (1990) Inorg. Chem., 29, p. 845 Gao, Wang, Li, Zao, (1991) Electrochim. Acta, 36, p. 147 Kubota, Gushikem, de Castro, Moreira, (1991) Colloids Surf., 57, p. 11 Kubota, Gushikem, Moreira, (1991) Analyst, 116, p. 281 S. Denofre, Y. Gushikem and C.U. Davanzo, Eur. J. Solid State Inorg. Chem., in pressStrelko, Khainakov, Kvashenko, Belyakov, Bortun, (1988) J. Appl. Chem. USSR, 61, p. 1922 Ayres, Waggoner, Synthesis and properties of two series of heavy metal hexacyanoferrates (1971) Journal of Inorganic and Nuclear Chemistry, 33, p. 721 Nakamoto, (1970) Infrared Spectra of Inorganic and Coordination Compounds, , Interscience, New York Shriver, (1963) J. Am. Chem. Soc., 85, p. 1405