Facile Preparation of Holey Anderson-type Polyoxometalate/Polyaniline/Graphene Nanocomposites for Supercapacitors.

Holey Fe-Anderson-type polyoxometalate/polyaniline/graphene (PPG) hybrid materials were first prepared by anchoring Anderson-type polyoxometalates [FeMo6O 2 4 H6] 3 − (FeMo 6) onto graphene modified with polyaniline via a facile hydrothermal treatment. The as-prepared materials exhibited an excellent electrochemical performance with a high specific capacitance of 1366 F g − 1 at 1 A g − 1 and outstanding cycling stability (97.6% capacitance retention after 5000 cycle times). The uptake of polyaniline/FeMo6 nanoparticles on graphene not only provided the pseudocapacitance but also weakened the aggregation between the graphene layers, resulting in a higher surface area compared with pure graphene. In addition, the AC//PPG-15 asymmetric supercapacitor device showed a high energy density of 24.65 W h kg − 1 at a low power density of 326.25 W kg − 1 and good cycling stability (94.82% capacitance retention after 5000 cycles). Hence, the as-prepared PPG hybrid materials in this work possess tremendous potential as electrodes for high-performance supercapacitors. Holey Fe-Anderson-type PPG hybrid materials were prepared via a facile hydrothermal treatment and subsequent freeze-drying process. Polyaniline/FeMo6 nanoparticles were well doped in graphene layers, which is favorable for improving ion and electron transport circumstances, resulting in high performance on the application of supercapacitor. [ABSTRACT FROM AUTHOR]