Related Experiment Video
Updated: May 28, 2026
10:23
Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies
Published on: November 5, 2015
Edge plane pyrolytic graphite electrode covalently modified with 2-anthraquinonyl groups: theory and experiment
Barbara R Kozub1, Martin C Henstridge, Christopher Batchelor-McAuley
1Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom.
Summary
Electrochemical modification of edge plane pyrolitic graphite (EPPG) with anthraquinone (AQ2) revealed surface inhomogeneity. Modeling surface potential distribution better explained electron transfer than uniform surface assumptions.
Area of Science:
- Electrochemistry
- Materials Science
- Physical Chemistry
Background:
- Edge plane pyrolitic graphite (EPPG) is a versatile electrode material.
- Electrochemical modification with anthraquinone (AQ2) creates a functionalized surface.
- Understanding electron transfer kinetics is crucial for electrochemical applications.
Purpose of the Study:
- To investigate the electron transfer processes on an EPPG-AQ2-modified electrode.
- To assess the impact of surface inhomogeneity on electrochemical behavior.
- To refine theoretical models for describing electron transfer at modified electrode surfaces.
Main Methods:
- Electrochemical modification of EPPG using AQ2-N(2)(+)BF(4)(-).
- Cyclic voltammetry to study electron transfer.
- Simulation using Marcus-Hush theory with models for surface inhomogeneity (potential and distance distributions).
Main Results:
- A surface coverage below a monolayer was achieved.
- Simulations assuming a uniform surface yielded unrealistic reorganization energies.
- A model incorporating a distribution of formal potentials provided a better fit to experimental data.
- Reorganization energies from the potential distribution model aligned with literature values.
Conclusions:
- Surface inhomogeneity significantly impacts electron transfer at EPPG-AQ2 electrodes.
- Modeling formal potential distribution is a more effective approach than assuming uniform tunneling distances.
- This study provides insights into the electrochemical behavior of modified graphitic surfaces.
