Novel ternary composites reduced-graphene oxide/zine oxide/poly(p-phenylenediamine) for supercapacitor: Synthesis and properties

A series of novel ternary composites reduced-graphene oxide/zine oxide/poly(p-phenylenediamine) (RGO/ZnO/PpPD) have been synthesized by employing the hydrothermal-polymerization method for the first time. RGO sheets substrate and thin PpPD coating are designed to effectively prevent the volume expansion of ZnO during the charging/discharging processes. We have found the proportions of components play an important role in determining the synergy of the composites. As a result, when the mass ratio of products (RGO: ZnO: PpPD) is equal to 1: 8: 8, the obtained composite achieves excellent electrochemical properties with a significantly increased specific capacitance of 320 F g(-1) at 5 mV s(-1) compared with 58 F/g for pure ZnO samples. In addition, GMP-1,8,8//GMP1,8,8 supercapacitor has been assembled and presents a maximum energy density of 18.14 Wh kg(-1) and a maximum power density of 10 kW kg(-1). (C) 2017 Elsevier B.V. All rights reserved.