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Adsorption and reactivity of hydrous iron oxide nanoparticles on boron-doped diamond

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Title: Adsorption and reactivity of hydrous iron oxide nanoparticles on boron-doped diamond
Authors: McKenzie, Katy J.1, Asogan, Dhinesh1, Marken, Frank F.Marken@lboro.ac.uk
Source: Electrochemistry Communications. Oct2002, Vol. 4 Issue 10, p820. 5p.
Subjects: Ferric oxide, Electrodes, Voltammetry, Electrocatalysis
Abstract: Hydrous iron oxide nanoparticles of 8–16 nm diameter are adsorbed from an aqueous sol onto the surface of polished boron-doped diamond electrodes. Boron-doped diamond acts as an inert substrate with low background currents and a wide potential window, allowing electrochemical and electrocatalytic properties of an electrically non-conducting material such as hydrous iron oxide to be studied.The electrochemical reduction of hydrous ferric oxide in aqueous phosphate buffer at pH 5 at a potential of ca. −0.2 V vs. SCE is accompanied by stripping of the deposit, which allows the determination of the approximate coverage of the oxide on the boron-doped diamond electrode, typically 1.4×10−9 mol cm−2. Next, hydrous ferric oxide is shown to act as an efficient electrocatalyst for the oxidation of hydroxide to dioxygen. The process is proposed to occur with apparently one electron per hydroxide via a Chet, revErevChet, irrev-type process, initiated by deprotonation of an active iron oxide surface site. It is also demonstrated that the reaction of hydrogen peroxide on hydrous ferric oxide surfaces (a heterogeneous Fenton-type process) is similarly triggered by the deprotonation of an active surface site. [Copyright &y& Elsevier]
Copyright of Electrochemistry Communications is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 7886098
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  Data: Adsorption and reactivity of hydrous iron oxide nanoparticles on boron-doped diamond
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  Data: <searchLink fieldCode="AR" term="%22McKenzie%2C+Katy+J%2E%22">McKenzie, Katy J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Asogan%2C+Dhinesh%22">Asogan, Dhinesh</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Marken%2C+Frank%22">Marken, Frank</searchLink><i> F.Marken@lboro.ac.uk</i>
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  Data: <searchLink fieldCode="JN" term="%22Electrochemistry+Communications%22">Electrochemistry Communications</searchLink>. Oct2002, Vol. 4 Issue 10, p820. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Ferric+oxide%22">Ferric oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Electrodes%22">Electrodes</searchLink><br /><searchLink fieldCode="DE" term="%22Voltammetry%22">Voltammetry</searchLink><br /><searchLink fieldCode="DE" term="%22Electrocatalysis%22">Electrocatalysis</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Hydrous iron oxide nanoparticles of 8–16 nm diameter are adsorbed from an aqueous sol onto the surface of polished boron-doped diamond electrodes. Boron-doped diamond acts as an inert substrate with low background currents and a wide potential window, allowing electrochemical and electrocatalytic properties of an electrically non-conducting material such as hydrous iron oxide to be studied.The electrochemical reduction of hydrous ferric oxide in aqueous phosphate buffer at pH 5 at a potential of ca. −0.2 V vs. SCE is accompanied by stripping of the deposit, which allows the determination of the approximate coverage of the oxide on the boron-doped diamond electrode, typically <f>1.4×10−9</f> mol <f>cm−2</f>. Next, hydrous ferric oxide is shown to act as an efficient electrocatalyst for the oxidation of hydroxide to dioxygen. The process is proposed to occur with apparently one electron per hydroxide via a <f>Chet, revErevChet, irrev</f>-type process, initiated by deprotonation of an active iron oxide surface site. It is also demonstrated that the reaction of hydrogen peroxide on hydrous ferric oxide surfaces (a heterogeneous Fenton-type process) is similarly triggered by the deprotonation of an active surface site. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Electrochemistry Communications is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/S1388-2481(02)00463-0
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      – Code: eng
        Text: English
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        StartPage: 820
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      – SubjectFull: Ferric oxide
        Type: general
      – SubjectFull: Electrodes
        Type: general
      – SubjectFull: Voltammetry
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      – SubjectFull: Electrocatalysis
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      – TitleFull: Adsorption and reactivity of hydrous iron oxide nanoparticles on boron-doped diamond
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              M: 10
              Text: Oct2002
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              Y: 2002
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