Synthesis of MnO2/poly-o-phenylenediamine composite and its application in supercapacitors

Abstract

• PoPD was for the first time applied to form composite with metal oxide. • PoPD/MnO 2 was synthesized by a one-step co-precipitation. • PoPD/MnO 2 composite was for the first time applied as electrode materials in supercapacitor. A composite of MnO 2 and poly- o -phenylenediamine (PoPD) was one-step synthesized by co-precipitation with the reaction of KMnO 4 and o-phenylenediamine in acidic solution at room temperature. The influence of the addition of cetyl trimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) on the morphology and electrochemical performance was investigated. FT-IR, XRD and SEM were adopted to examine the obtained materials, and the electrochemical properties of the products were characterized by cyclic voltammetry and galvanostatic charge–discharge. The material synthesized in the presence of 2.5 g L −1 had a specific capacitance of 262.2 F g −1 determined with cyclic voltammetry in a potential window of 0–0.9 V vs. saturated calomel electrode in 1.0 mol L −1 KNO 3 solution.