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Underpotential surface reduction of mesoporous CeO 2 nanoparticle films

Cummings, Charles Y. ; Stott, Susan J. ; Bonné, Michael J. ; Edler, Karen J. LU orcid ; King, Pauline M. ; Mortimer, Roger J. and Marken, Frank (2008) In Journal of Solid State Electrochemistry 12(12). p.1541-1548
Abstract

The formation of variable-thickness CeO 2 nanoparticle mesoporous films from a colloidal nanoparticle solution (approximately 1-3-nm-diameter CeO 2) is demonstrated using a layer-by-layer deposition process with small organic binder molecules such as cyclohexanehexacarboxylate and phytate. Film growth is characterised by scanning and transmission electron microscopies, X-ray scattering and quartz crystal microbalance techniques. The surface electrochemistry of CeO 2 films before and after calcination at 500 °C in air is investigated. A well-defined Ce(IV/III) redox process confined to the oxide surface is observed. Beyond a threshold potential, a new phosphate phase, presumably CePO 4, is... (More)

The formation of variable-thickness CeO 2 nanoparticle mesoporous films from a colloidal nanoparticle solution (approximately 1-3-nm-diameter CeO 2) is demonstrated using a layer-by-layer deposition process with small organic binder molecules such as cyclohexanehexacarboxylate and phytate. Film growth is characterised by scanning and transmission electron microscopies, X-ray scattering and quartz crystal microbalance techniques. The surface electrochemistry of CeO 2 films before and after calcination at 500 °C in air is investigated. A well-defined Ce(IV/III) redox process confined to the oxide surface is observed. Beyond a threshold potential, a new phosphate phase, presumably CePO 4, is formed during electrochemical reduction of CeO 2 in aqueous phosphate buffer solution. The voltammetric signal is sensitive to (1) thermal pre-treatment, (2) film thickness, (3) phosphate concentration and (4) pH. The reversible 'underpotential reduction' of CeO 2 is demonstrated at potentials positive of the threshold. A transition occurs from the reversible 'underpotential region' in which no phosphate phase is formed to the irreversible 'overpotential region' in which the formation of the cerium(III) phosphate phase is observed. The experimental results are rationalised based on surface reactivity and nucleation effects.

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author
; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
keywords
Assembly, CeO, Cyclic voltammetry, Electroanalysis, Electrocatalysis, ITO, Nanoparticle, Sensor, Underpotential reduction
in
Journal of Solid State Electrochemistry
volume
12
issue
12
pages
8 pages
publisher
Springer
external identifiers
  • scopus:52549108753
ISSN
1432-8488
DOI
10.1007/s10008-008-0508-4
language
English
LU publication?
no
id
174604b7-fd81-4f9f-9785-665b179c2f1c
date added to LUP
2023-05-04 18:35:28
date last changed
2023-06-13 08:10:20
@article{174604b7-fd81-4f9f-9785-665b179c2f1c,
  abstract     = {{<p>The formation of variable-thickness CeO <sub>2</sub> nanoparticle mesoporous films from a colloidal nanoparticle solution (approximately 1-3-nm-diameter CeO <sub>2</sub>) is demonstrated using a layer-by-layer deposition process with small organic binder molecules such as cyclohexanehexacarboxylate and phytate. Film growth is characterised by scanning and transmission electron microscopies, X-ray scattering and quartz crystal microbalance techniques. The surface electrochemistry of CeO <sub>2</sub> films before and after calcination at 500 °C in air is investigated. A well-defined Ce(IV/III) redox process confined to the oxide surface is observed. Beyond a threshold potential, a new phosphate phase, presumably CePO <sub>4</sub>, is formed during electrochemical reduction of CeO <sub>2</sub> in aqueous phosphate buffer solution. The voltammetric signal is sensitive to (1) thermal pre-treatment, (2) film thickness, (3) phosphate concentration and (4) pH. The reversible 'underpotential reduction' of CeO <sub>2</sub> is demonstrated at potentials positive of the threshold. A transition occurs from the reversible 'underpotential region' in which no phosphate phase is formed to the irreversible 'overpotential region' in which the formation of the cerium(III) phosphate phase is observed. The experimental results are rationalised based on surface reactivity and nucleation effects.</p>}},
  author       = {{Cummings, Charles Y. and Stott, Susan J. and Bonné, Michael J. and Edler, Karen J. and King, Pauline M. and Mortimer, Roger J. and Marken, Frank}},
  issn         = {{1432-8488}},
  keywords     = {{Assembly; CeO; Cyclic voltammetry; Electroanalysis; Electrocatalysis; ITO; Nanoparticle; Sensor; Underpotential reduction}},
  language     = {{eng}},
  number       = {{12}},
  pages        = {{1541--1548}},
  publisher    = {{Springer}},
  series       = {{Journal of Solid State Electrochemistry}},
  title        = {{Underpotential surface reduction of mesoporous CeO <sub>2</sub> nanoparticle films}},
  url          = {{http://dx.doi.org/10.1007/s10008-008-0508-4}},
  doi          = {{10.1007/s10008-008-0508-4}},
  volume       = {{12}},
  year         = {{2008}},
}