Electrochemical charge storage using layer-by-layer deposited film composed of redox polymer and inorganic nanoparticle

Abstract

We demonstrated electrochemical charge storage in a Layer-by-layer assembled hybrid film. A cationic polymer, which contain ruthenium complex (pCM/Ru) and negatively charged Prussian blue (PB) nanoparticles, were assembled onto an ITO electrode a using layer-by-layer technique, so that pCM/Ru layer located in an inner layer and PB located in an outer layer. The electrochemical property of the hybrid film was studied by cyclic voltammetry (CV) measurement. The first scan of CV cycle showed an asymmetric spectrum in which oxidation current was about 1.7 times larger than reduction current, whereas those current values were almost identical for 2nd and 3rd CV cycles. The asymmetric CV spectrum indicates that PB at the outer layer was catalytically oxidized by pCM/Ru layer and stored positive charges at the first CV cycle.