High‐performance flexible supercapacitor based on morphology tuned polypyrrole/molybdenum disulfide nanocomposites

Abstract Polypyrrole (PPy) is the most studied material among the conducting polymers for high‐performance supercapacitors. However, due to morphology collapse, polypyrrole exhibits poor cycling ability and lower charge storage capacity, limiting its real‐world applications. To address these issues herein, the binary nanocomposites of PPy with MoS 2 (molybdenum disulfide) NSs (nanostructures) in two different morphologies, that is, cenosphere (PPyC) and nanotubes (PPyNTs), have been prepared through in situ polymerization technique. The electrochemical performances of PPyC/MoS 2 and PPyNTs/MoS 2 nanocomposite are compared to define the most favorable morphology when PPy nanostructures are utilized as the electrode materials for creating flexible supercapacitors. The rational design of PPyNTs/MoS 2 nanocomposite consisting of dense wrapping of PPyNTs on MoS 2 leads to high specific capacitance ( C sp ) up to 481 F/g at 0.5 A/g. After 2000 charge‐discharge cycles, a decline of 5.6% in the specific capacitance of PPyNTs/MoS 2 nanocomposite was observed, primarily attributed to the presence of chemically active sites on MoS 2 nanosheets. This led to a strong alignment with the nitrogen group of pyrrole rings in the polymer chain to form a robust interconnected framework between tubular PPy and sheet‐like MoS 2 . This outstanding performance of PPyNTs/MoS 2 nanocomposite resulted in designing futuristic flexible supercapacitors.