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

D V Bavykin, E V Milsom, F Marken, D H Kim, D H Marsh, D J Riley, F C Walsh, K H El-Abiary, A A Lapkin

Research output: Contribution to journalArticle

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)]
Original languageEnglish
Pages (from-to)1050-1058
Number of pages9
JournalElectrochemistry Communications
Volume7
Issue number10
Publication statusPublished - 2005

Keywords

  • Surface 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)

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  • Cite this

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