Nanostructured TiO2 arrays obtained at low and high potential
Por:
Solís De La Fuente M., Rincón González M.E., Concha Guzmán M.O., Cuevas Arteaga C.
Publicada:
1 ene 2011
Resumen:
Synthesis and characterization of nanostructured TiO2 arrays obtained by electrochemical anodization of Ti foils at low (<3V) and high (50V) potential, using different electrolyte solutions, are presented. Scanning electron microscopy studies indicated that at low potential film formation is characterized by a porous array with pore length < 1 micrometer, whereas at high potential it corresponds to a nanotube array with nanotube length of 8 micrometers. The difference in surface roughness between the porous and nanotube arrays did not agree with the photocurrent difference observed in a photoelectrochemical cell, suggesting the presence of limiting phenomena in the longer tubes for this application. Electrochemical impedance studies revealed low capacitance and large pore resistance in TiO2 nanotubes, which point out to restricted ion diffusion in photoelectrochemical devices working at low bias, as well as different surface reactivity. ©The Electrochemical Society.
Filiaciones:
Solís De La Fuente M.:
Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Av. Xochicalco S/N, Col. Centro, Temixco, Mor., 62580, Mexico
Rincón González M.E.:
Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Av. Xochicalco S/N, Col. Centro, Temixco, Mor., 62580, Mexico
Concha Guzmán M.O.:
Facultad de Ciencias Químicas e Ingenierías, Centro de Investigación en Ingeniería y Ciencias Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, Cuernavaca, Mor. 62210, Mexico
Cuevas Arteaga C.:
Facultad de Ciencias Químicas e Ingenierías, Centro de Investigación en Ingeniería y Ciencias Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, Cuernavaca, Mor. 62210, Mexico
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