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Published October 1, 2014 | Supplemental Material + Erratum
Journal Article Open

Modeling Dioxygen Reduction at Multicopper Oxidase Cathodes


We report a general kinetics model for catalytic dioxygen reduction on multicopper oxidase (MCO) cathodes. Our rate equation combines Butler–Volmer (BV) electrode kinetics and the Michaelis–Menten (MM) formalism for enzymatic catalysis, with the BV model accounting for interfacial electron transfer (ET) between the electrode surface and the MCO type 1 copper site. Extending the principles of MM kinetics to this system produced an analytical expression incorporating the effects of subsequent intramolecular ET and dioxygen binding to the trinuclear copper cluster into the cumulative model. We employed experimental electrochemical data on Thermus thermophilus laccase as benchmarks to validate our model, which we suggest will aid in the design of more efficient MCO cathodes. In addition, we demonstrate the model's utility in determining estimates for both the electronic coupling and average distance between the laccase type-1 active site and the cathode substrate.

Additional Information

© 2014 American Chemical Society. Received: July 29, 2014. Publication Date (Web): September 4, 2014. We thank Fan Liu, Joseph Varghese, and Jay Winkler for helpful discussions and the Beckman Institute Molecular Materials Research Center for access to equipment. This research was funded by the NSF CCI Solar Fuels Program (CHE-1305124) and a Perkins Grant (JRH.PERKINS3-1-GRANT.PERKINS3). The authors declare no competing financial interest.

Attached Files

Supplemental Material - ja5077519_si_002.pdf

Supplemental Material - ja5077519_si_003.pdf

Erratum - jacs.5b11603.pdf


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August 20, 2023
October 20, 2023