SCHEDULED MAINTENANCE
Synthesis of ternary graphene/molybdenum oxide/poly(p-phenylenediamine) nanocomposites for symmetric supercapacitors†
Abstract
A novel ternary graphene/molybdenum oxide/poly(p-phenylenediamine) nanocomposite (GMP) has been successfully synthesized via a two-step process including the generation of binary graphene/MoO3 composites through a hydrothermal method and chemical polymerization of p-phenylenediamine (pPD) monomer. When the feed ratio of pPD to Na2MoO4·2H2O is 1, the resulting composite (GMP-1.0) possesses superior electrochemical performance with a maximum specific capacitance of 1042.6 F g−1 at 1 A g−1 in a three-electrode system and 418.5 F g−1 at 1 A g−1 in a two-electrode system. Its energy density achieves 24.56 W h kg−1 at a power density of 325 W kg−1, and 6.8 W h kg−1 at a high power density of 3263 W kg−1. Furthermore, the ternary composite retains 86.7% of the initial capacitance after 3000 cycles, indicating its excellent cycling stability.
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