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In the Laboratory
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Theoretical Concepts and Applications of a Rotating Disk Electrode
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J. Nikolic, E. Expósito, J. Iniesta, J. González-Garcia, and V. Montiel
Departamento de Química-Física, Universidad de Alicante, Ap. correos 99, Alicante E-03080, Spain
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September 2000
Vol. 77 No. 9
p. 1191
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| Abstract |
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This paper verifies the theoretical concepts and shows one application of a rotating disk electrode (RDE). This is a powerful instrument employed in electrochemistry, capable of controlling the transport regime of electroactive species toward the electrode. Students use the redox couple Fe(CN)63-/Fe(CN)64- to check the model and theoretical concepts that describe the RDE behavior. They also use the RDE to qualitatively distinguish between kinetic, mixed, and mass transport controlled regions in an electrochemical process. In the last part of the paper, an important parameter, the diffusion coefficient (D) of the electroactive species, is calculated: D(Fe(CN)63-) = 2.6 X 10-9 m2 s-1, D(Fe(CN)64-) = 2.7 X 10-9 m2 s-1.
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| Supplement |
Written material for students are included.
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 Contents |
JCE2000p1191W.doc (Microsoft Word)
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| Download |
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| More Information |
Citation |
Nikolic, J.; Expósito, Eduardo; Iniesta, Jesús; González-Garcia, José; Montiel, Vicente. J. Chem. Educ. 2000 77 1191.
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Keywords |
Physical Chemistry; Electrochemistry; Diffusion; Redox Reactions
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History |
Created:
Last Updated: |
August 29, 2000
August 31, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
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September
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1191
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