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Epinephrine electro-oxidation highlights fast electrochemistry at the graphite basal surface
Anisha N Patel1, Sze-yin Tan, Patrick R Unwin
1Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK. p.r.unwin@warwick.ac.uk.
Chemical Communications (Cambridge, England)
|August 22, 2013
Summary
Epinephrine electro-oxidation occurs on graphite basal surfaces, not just step edges. This finding challenges the established model for molecular electrocatalysis at electrode surfaces.
Area of Science:
- Electrochemistry
- Materials Science
- Surface Chemistry
Background:
- The prevailing model suggests step edges are crucial for molecular electrocatalysis.
- Understanding the active sites in electrochemical reactions is vital for catalyst design.
Purpose of the Study:
- To investigate the role of graphite basal planes versus step edges in epinephrine electro-oxidation.
- To challenge or confirm the existing literature model of electrocatalysis.
Main Methods:
- Utilized macroscale and nanoscale electrochemical measurements.
- Employed graphite electrodes with varying step edge densities.
Main Results:
- Epinephrine electro-oxidation was observed to occur readily at the basal surface of graphite electrodes.
- Step edges were found not to be essential for this molecular electrocatalysis.
Conclusions:
- The basal surface of graphite is an active site for epinephrine electro-oxidation.
- The current literature model requiring step edges for this reaction is inaccurate.
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