| 초록 |
Three-dimensional nanostructured hybrid electrode materials with tunable capacitive phases were prepared using graphene/particulate polypyrrole (PPy) nanohybrid (GPH) precursors,where importantly any separate process for incorporating heterogeneous species was not used. The electrode material, namely carbonized GPHs (CGPHs) featured a mesophase capacitance consisting of both electric double-layer (EDL) capacitive and pseudocapacitive elements at the molecular level. The ratio of EDL capacitive element to pseudocapacitive element (E-to-P) in the mesophase electrode materials was controlled by varying the PPy-to-graphite weight (Pw/Gw) ratio and by heat treatment(TH).We proposed the concept of “E-to-P ratio (EPR) index” to identify the capacitive characteristics of the mesophase electrode using a numerical algorithm. The CGPNHs were integrated into symmetric two-electrode capacitor cells,which showed excellent energy and power densities in both aqueous and ionic liquid electrolytes. |
