Probing the distribution of redox in the diffusion layer of the substrate electrode by the scanning electrochemical microscopy

Taking advantage of the dual working electrodes and the precise positioning of the tip electrode of the scanning electrochemical microscopy, the distribution of ferrocenemethanol in the diffusion layer of the substrate electrode is studied when the substrate potential is applied. When the co-directional potential is applied to the substrate, the closer to the surface of the substrate electrode, the less the amount of ferrocenemethanol. Because the reaction of the substrate electrode and the tip electrode is the same, they compete with each other. When the reverse potential is applied to the substrate electrode, the closer to the surface of the substrate electrode, the more the amount of ferrocenemethanol. Because the reaction of the substrate electrode can regenrate ferrocenemethanol.