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A novel cation-binding TiO2 nanotube substrate for electro- and bioelectro-catalysis

A novel cation-binding TiO2 nanotube substrate for electro- and bioelectro-catalysis
A novel cation-binding TiO2 nanotube substrate for electro- and bioelectro-catalysis
TiO2 nanotubes (8–20 nm outer diameter and 3–5 nm inner diameter) grown via alkaline hydrothermal synthesis are characterised and compared to 6 nm diameter TiO2 (anatase) nanoparticles. Zeta potential, voltammetric, and titration experiments reveal that, in contrast to anatase nanoparticles (p.z.c. ca. 6), TiO2 nanotubes carry a stronger negative surface charge (p.z.c. ca. 3, acidic protons ca. 2 × 10?3 mol g?1, electrostatic cation adsorption sites in neutral solution ca. 7 × 10?5 mol g?1) and, under neutral conditions, offer electrostatic binding sites for cations.
When immobilised onto an inert boron-doped diamond substrate, TiO2 nanotubes show electrochemical reactivity due to reversible Ti(IV) reduction, which is very similar to that observed for anatase nanoparticles. Three cationic redox systems, Meldola’s blue, Ni2+, and cytochrome c, are immobilised on the TiO2 nanotube surface; the binding ability and the number of binding sites are quantified voltammetrically. Redox proteins, such as cytochrome c, adsorb readily and irreversibly. Well-defined voltammetric signals for the immobilised protein are observed in an aqueous buffer. TiO2 nanotubes are shown to be novel, inert substrates for both inorganic and biological electrocatalysts.
tio2, nanotubes, catalysis, cytochrome c, ethanol, meldola’s blue, sensors
1388-2481
1050-1058
Bavykin, D.V.
1e9fabfc-d078-4585-876f-85ff33b7eed5
Milsom, E.V.
697c7c7b-06c4-45e8-a47f-c0a96e55b682
Marken, F.
123dfff8-7d86-4b65-96ca-751b417e5192
Kim, D.H.
ea5b43e9-03ec-4df7-967b-c3591def3784
Marsh, D.H.
ee0c9802-5a7d-493d-a57a-851287c5a95b
Riley, D.J.
e56867f4-e679-46b3-a120-9db22f9eb7e5
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
El-Abiary, K.H.
e2c52498-00e3-4f81-bc4d-e66ce39522b8
Lapkin, A.A.
5d2ba9a5-f4c0-47cf-a8e4-f5216425d8d0
Walsh, FC
309528e7-062e-439b-af40-9309bc91efb2
Bavykin, D.V.
1e9fabfc-d078-4585-876f-85ff33b7eed5
Milsom, E.V.
697c7c7b-06c4-45e8-a47f-c0a96e55b682
Marken, F.
123dfff8-7d86-4b65-96ca-751b417e5192
Kim, D.H.
ea5b43e9-03ec-4df7-967b-c3591def3784
Marsh, D.H.
ee0c9802-5a7d-493d-a57a-851287c5a95b
Riley, D.J.
e56867f4-e679-46b3-a120-9db22f9eb7e5
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
El-Abiary, K.H.
e2c52498-00e3-4f81-bc4d-e66ce39522b8
Lapkin, A.A.
5d2ba9a5-f4c0-47cf-a8e4-f5216425d8d0
Walsh, FC
309528e7-062e-439b-af40-9309bc91efb2

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. , Walsh, FC (ed.) (2005) A novel cation-binding TiO2 nanotube substrate for electro- and bioelectro-catalysis. Electrochemistry Communications, 7 (10), 1050-1058. (doi:10.1016/j.elecom.2005.07.010).

Record type: Article

Abstract

TiO2 nanotubes (8–20 nm outer diameter and 3–5 nm inner diameter) grown via alkaline hydrothermal synthesis are characterised and compared to 6 nm diameter TiO2 (anatase) nanoparticles. Zeta potential, voltammetric, and titration experiments reveal that, in contrast to anatase nanoparticles (p.z.c. ca. 6), TiO2 nanotubes carry a stronger negative surface charge (p.z.c. ca. 3, acidic protons ca. 2 × 10?3 mol g?1, electrostatic cation adsorption sites in neutral solution ca. 7 × 10?5 mol g?1) and, under neutral conditions, offer electrostatic binding sites for cations.
When immobilised onto an inert boron-doped diamond substrate, TiO2 nanotubes show electrochemical reactivity due to reversible Ti(IV) reduction, which is very similar to that observed for anatase nanoparticles. Three cationic redox systems, Meldola’s blue, Ni2+, and cytochrome c, are immobilised on the TiO2 nanotube surface; the binding ability and the number of binding sites are quantified voltammetrically. Redox proteins, such as cytochrome c, adsorb readily and irreversibly. Well-defined voltammetric signals for the immobilised protein are observed in an aqueous buffer. TiO2 nanotubes are shown to be novel, inert substrates for both inorganic and biological electrocatalysts.

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More information

Submitted date: 6 July 2005
Published date: 26 July 2005
Keywords: tio2, nanotubes, catalysis, cytochrome c, ethanol, meldola’s blue, sensors

Identifiers

Local EPrints ID: 23612
URI: http://eprints.soton.ac.uk/id/eprint/23612
ISSN: 1388-2481
PURE UUID: 2880f7db-d335-4cc5-862d-f5d4a9ba76e6

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Date deposited: 20 Mar 2006
Last modified: 15 Jul 2019 19:19

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Contributors

Author: D.V. Bavykin
Author: E.V. Milsom
Author: F. Marken
Author: D.H. Kim
Author: D.H. Marsh
Author: D.J. Riley
Author: F.C. Walsh
Author: K.H. El-Abiary
Author: A.A. Lapkin
Editor: FC Walsh

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