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Particle impacts are used to quantify the adsorption of catechol on single alumina particles. In these experiments, particles suspended in solution impact a microelectrode held at a suitable potential for the oxidation or reduction of the adsorbed species and the resulting current/time transient "spikes" associated with individual impacts measured. Using theory for charge diffusion over the surface of a sphere, the individual impact spikes arising from the electro-oxidation of adsorbed catechol can be modeled to derive the diffusion coefficient of charge transfer over the surface of alumina as (2.5 ± 0.5) × 10-6 cm2 s-1. The coverage of catechol on the surface of alumina is found to be (5.9 ± 1.9) × 10-10 mol cm-2

Quantifying Adsorption on Single Alumina Particles via Impact Voltammetry and Current Transient Analysis