Inspired
by supermolecular self-assembly strategy, the N, P co-doped reduced
graphene oxide (NP-rGO) material is fabricated by heat treatment from
the supermolecular system of GO/MP (melamine and phytic acid supramolecular
polymer). Herein, MP acts as not only a “sacrifice template”
to promote the formation of uniform three-dimensional (3D) porous
structure but also a spacer to hinder the graphene sheets from aggregate,
as well as a precursor of nitrogen and phosphorus for N, P co-doping.
The characterization results indicate that the NP-rGO has 3D porous
structure with loose-packed and crumpled transparent thin layer morphology.
The electrochemical measurements reveal that compared with the undoped
rGO, the NP-rGO exhibits enhanced capacitive properties, including
high specific capacitance (416 F g–1) and outstanding
rate capability. After 10 000 cycles 94.63% capacitance is
maintained, indicating good cycle stability. The NP-rGO is further
assembled into symmetric supercapacitors, and the energy density of
the NP-rGO is 22.3 Wh kg–1 (at 500 W kg–1). The outstanding supercapacitive properties may be attributed to
the pesudocapacitive effect of N, P co-doping in graphene nanosheets
as well as exceptional 3D porous structure.
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