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Direct reversible voltammetry and electrocatalysis with surface-stabilised Fe2O3 redox states

Cummings, Charles Y. ; Bonné, Michael J. ; Edler, Karen J. LU orcid ; Helton, Matthew ; McKee, Anthony and Marken, Frank (2008) In Electrochemistry Communications 10(11). p.1773-1776
Abstract

Nanoparticle film voltammetry is employed to explore the presence and reactivity of surface-stabilised iron redox centers at the interface of immobilised Fe2O3 nanoparticles of ca. 4 nm diameter and aqueous buffer media. Mesoporous films of Fe2O3 nanoparticles on tin-doped indium oxide (ITO) substrates are formed in a layer-by-layer deposition process from aqueous colloidal Fe2O3 and aqueous cyclohexyl-hexacarboxylate followed by thermal (500 °C) removal of the organic binder content. Both reversible oxidation and reversible reduction responses for Fe(III) are observed in phosphate and carbonate buffer media in the "underpotential" zone. Higher oxidation states of iron... (More)

Nanoparticle film voltammetry is employed to explore the presence and reactivity of surface-stabilised iron redox centers at the interface of immobilised Fe2O3 nanoparticles of ca. 4 nm diameter and aqueous buffer media. Mesoporous films of Fe2O3 nanoparticles on tin-doped indium oxide (ITO) substrates are formed in a layer-by-layer deposition process from aqueous colloidal Fe2O3 and aqueous cyclohexyl-hexacarboxylate followed by thermal (500 °C) removal of the organic binder content. Both reversible oxidation and reversible reduction responses for Fe(III) are observed in phosphate and carbonate buffer media in the "underpotential" zone. Higher oxidation states of iron formed anodically (here tentatively assigned to Fe(IV)) are shown to be inert in phosphate buffer media but reactive towards the oxidation of glucose in carbonate buffer media.

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author
; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
keywords
Glucose, Iron oxide, Mesoporous film, Nanoparticle, Sensor, Underpotential zone, Voltammetry
in
Electrochemistry Communications
volume
10
issue
11
pages
4 pages
publisher
Elsevier
external identifiers
  • scopus:54149093309
ISSN
1388-2481
DOI
10.1016/j.elecom.2008.09.018
language
English
LU publication?
no
id
bdd11b78-5f27-4b71-9828-0797e0dbe4d7
date added to LUP
2023-05-04 18:19:12
date last changed
2023-06-13 08:12:26
@article{bdd11b78-5f27-4b71-9828-0797e0dbe4d7,
  abstract     = {{<p>Nanoparticle film voltammetry is employed to explore the presence and reactivity of surface-stabilised iron redox centers at the interface of immobilised Fe<sub>2</sub>O<sub>3</sub> nanoparticles of ca. 4 nm diameter and aqueous buffer media. Mesoporous films of Fe<sub>2</sub>O<sub>3</sub> nanoparticles on tin-doped indium oxide (ITO) substrates are formed in a layer-by-layer deposition process from aqueous colloidal Fe<sub>2</sub>O<sub>3</sub> and aqueous cyclohexyl-hexacarboxylate followed by thermal (500 °C) removal of the organic binder content. Both reversible oxidation and reversible reduction responses for Fe(III) are observed in phosphate and carbonate buffer media in the "underpotential" zone. Higher oxidation states of iron formed anodically (here tentatively assigned to Fe(IV)) are shown to be inert in phosphate buffer media but reactive towards the oxidation of glucose in carbonate buffer media.</p>}},
  author       = {{Cummings, Charles Y. and Bonné, Michael J. and Edler, Karen J. and Helton, Matthew and McKee, Anthony and Marken, Frank}},
  issn         = {{1388-2481}},
  keywords     = {{Glucose; Iron oxide; Mesoporous film; Nanoparticle; Sensor; Underpotential zone; Voltammetry}},
  language     = {{eng}},
  number       = {{11}},
  pages        = {{1773--1776}},
  publisher    = {{Elsevier}},
  series       = {{Electrochemistry Communications}},
  title        = {{Direct reversible voltammetry and electrocatalysis with surface-stabilised Fe<sub>2</sub>O<sub>3</sub> redox states}},
  url          = {{http://dx.doi.org/10.1016/j.elecom.2008.09.018}},
  doi          = {{10.1016/j.elecom.2008.09.018}},
  volume       = {{10}},
  year         = {{2008}},
}