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A novel cation-binding TiO2 nanotube substrate for electro- and bioelectrocatalysis


Reference:

Bavykin, D. V., Milsom, E. V., Marken, F., Kim, D. H., Marsh, D. H., Riley, D. J., Walsh, F. C., El-Abiary, K. H. and Lapkin, A. A., 2005. A novel cation-binding TiO2 nanotube substrate for electro- and bioelectrocatalysis. Electrochemistry Communications, 7 (10), pp. 1050-1058.

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Abstract

TiO2 nanotubes (8-20 nm outer diam. and 3-5 nm inner diam.) grown via alk. hydrothermal synthesis are characterized and compared to 6 nm diam. TiO2 (anatase) nanoparticles. Zeta potential, voltammetric, and titrn. expts. reveal that, in contrast to anatase nanoparticles (p.z.c. .apprx.6), TiO2 nanotubes carry a stronger neg. surface charge (p.z.c. .apprx.3, acidic protons .apprx.2 * 10-3 mol g-1, electrostatic cation adsorption sites in neutral soln. .apprx.7 * 10-5 mol g-1) and, under neutral conditions, offer electrostatic binding sites for cations. When immobilized onto an inert B-doped diamond substrate, TiO2 nanotubes show electrochem. reactivity due to reversible Ti(IV) redn., which is very similar to that obsd. for anatase nanoparticles. Three cationic redox systems, Meldola's blue, Ni2+, and cytochrome c, are immobilized on the TiO2 nanotube surface; the binding ability and the no. of binding sites are quantified voltammetrically. Redox proteins, such as cytochrome c, adsorb readily and irreversibly. Well-defined voltammetric signals for the immobilized protein are obsd. in an aq. buffer. TiO2 nanotubes are novel, inert substrates for both inorg. and biol. electrocatalysts. [on SciFinder (R)]

Details

Item Type Articles
CreatorsBavykin, D. V., Milsom, E. V., Marken, F., Kim, D. H., Marsh, D. H., Riley, D. J., Walsh, F. C., El-Abiary, K. H. and Lapkin, A. A.
Uncontrolled Keywordssurface structure (of titania nanotubes), chemically modified electrodes (titania immobilized on boron-doped diamond), catalysts (electrocatalysts, nanotubes (titania, adsorption, nickel ion adsorption cyclic voltammetry titania nanotube, titania nanotubes immobilized on b-doped diamond substrate for electrocatalysts and bioelectrocatalysts), meldola blue adsorption cyclic voltammetry titania nanotube immobilized diamond, titania nanotube immobilized boron doped diamond electrocatalysis bioelectrocatalysis, titania nanotubes immobilized on b-doped diamond substrate for electrocatalysis and bioelectrocatalysis), cytochrome c adsorption cyclic voltammetry titania nanotube immobilized diamond, cyclic voltammetry (of cytochrome c and meldola's blue and ni2+ ion on titania nanotubes immobilized on b-doped diamond substrate)
DepartmentsFaculty of Engineering & Design > Chemical Engineering
RefereedYes
StatusPublished
ID Code926

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