Abstract
The electrochemical oxidation of H2O2 at a platinum rotating disc electrode was studied at pH 7.26 for the [H2O2] range 0-70 mM, rotation rates 630-10000 rpm and anodic potential +264 to +712 mV vs Ag/AgCl using staircase potentiometry. A mechanism is proposed to account for the steady-state current as a function of rotation rate, [H2O2] and anodic potential. This mechanism involves reversible binding of H2O2 to electrochemically generated Pt(II) surface sites, reduction of the site and inhibiting competitive adsorption of H+ and O2. Potential-invariant values of the constants for H2O2, H+ and O2 binding are determined and the rate constants for the reduction and the re-oxidation of the binding site as a function of potential are evaluated.
| Original language | English |
|---|---|
| Pages (from-to) | 2015-2024 |
| Number of pages | 10 |
| Journal | Electrochimica Acta |
| Volume | 43 |
| Issue number | 14-15 |
| Publication status | Published - May 7 1998 |
| Externally published | Yes |
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Keywords
- Hydrogen peroxide
- Mechanism
- Oxidation
- Platinum
- Rotating disc electrode
ASJC Scopus subject areas
- Chemical Engineering(all)
- Analytical Chemistry
- Electrochemistry
Cite this
Electrochemical oxidation of hydrogen peroxide at platinum electrodes. Part II : Effect of potential. / Hall, Simon B.; Khudaish, Emad A.; Hart, Alan L.
In: Electrochimica Acta, Vol. 43, No. 14-15, 07.05.1998, p. 2015-2024.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electrochemical oxidation of hydrogen peroxide at platinum electrodes. Part II
T2 - Effect of potential
AU - Hall, Simon B.
AU - Khudaish, Emad A.
AU - Hart, Alan L.
PY - 1998/5/7
Y1 - 1998/5/7
N2 - The electrochemical oxidation of H2O2 at a platinum rotating disc electrode was studied at pH 7.26 for the [H2O2] range 0-70 mM, rotation rates 630-10000 rpm and anodic potential +264 to +712 mV vs Ag/AgCl using staircase potentiometry. A mechanism is proposed to account for the steady-state current as a function of rotation rate, [H2O2] and anodic potential. This mechanism involves reversible binding of H2O2 to electrochemically generated Pt(II) surface sites, reduction of the site and inhibiting competitive adsorption of H+ and O2. Potential-invariant values of the constants for H2O2, H+ and O2 binding are determined and the rate constants for the reduction and the re-oxidation of the binding site as a function of potential are evaluated.
AB - The electrochemical oxidation of H2O2 at a platinum rotating disc electrode was studied at pH 7.26 for the [H2O2] range 0-70 mM, rotation rates 630-10000 rpm and anodic potential +264 to +712 mV vs Ag/AgCl using staircase potentiometry. A mechanism is proposed to account for the steady-state current as a function of rotation rate, [H2O2] and anodic potential. This mechanism involves reversible binding of H2O2 to electrochemically generated Pt(II) surface sites, reduction of the site and inhibiting competitive adsorption of H+ and O2. Potential-invariant values of the constants for H2O2, H+ and O2 binding are determined and the rate constants for the reduction and the re-oxidation of the binding site as a function of potential are evaluated.
KW - Hydrogen peroxide
KW - Mechanism
KW - Oxidation
KW - Platinum
KW - Rotating disc electrode
UR - http://www.scopus.com/inward/record.url?scp=0032316206&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032316206&partnerID=8YFLogxK
M3 - Article
VL - 43
SP - 2015
EP - 2024
JO - Electrochimica Acta
JF - Electrochimica Acta
SN - 0013-4686
IS - 14-15
ER -