Nanoimpacts Reveal the Electron‐Transfer Kinetics of the Ferrocene/Ferrocenium Couple Immobilised on Graphene Nanoplatelets

: The kinetics of the ferrocene/ferrocenium (Cp 2 Fe/Cp 2 Fe + ) redox couple immobilised on graphene nanoplatelets (GNPs) in aqueous solution are evaluated using the nano-impacts method. Single GNPs modified with poly(vinylferrocene) [PVFc] are allowed to impact a microelectrode. For the duration (~ 10 – 100 ms) of the impacts the GNP adopts the potential of the electrode and acts as a ‘chemically modified nanoelectrode’. The study of individual impacts facilitates the resolution of fast electron transfer kinetics which for the Cp 2 Fe/Cp 2 Fe + couple is shown to be at least 3 ± 1 s -1 . The kinetics of the ferrocene/ferrocenium (Cp 2 Fe/Cp 2 Fe + ) redox couple in aqueous solution are evaluated using the nano-impacts method. Single graphene nanoplatelets (GNPs) modified with poly(vinylferrocene) [PVFc] are allowed to impact a microelectrode. For the duration (~ 10 – 100 ms) of the impacts the GNP adopts the potential of the electrode and acts as a ‘chemically modified nanoelectrode’. The study of individual impacts facilitates the resolution of fast electron transfer kinetics which for the Cp 2 Fe/Cp 2 Fe + couple is shown to be at least 3 ± 1 s -1 .

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