Collisions of suspended Prussian Blue nanoparticles with a rotating disc electrode

The electrochemistry of suspended nanoparticles has attracted some attention as a method of characterizing them. Taking redox-active Prussian Blue nanoparticles as an example, we demonstrate that suspended redox-active inorganic nanoparticles exhibit electrochemical reactivity. When the potential of a rotating disc electrode is sufficiently low or high, a series of injections of a suspension of nanoparticles into an aqueous electrolyte produces sharp current increases resulting from their electroreduction or electrooxidation, respectively. The magnitude of the current steps is linearly dependent on the concentration of the nanoparticles. Much larger current steps are obtained in the presence of H2O2 as a result of catalytic amplification.