MoO3/PANI coaxial heterostructure nanobelts by in situ polymerization for high performance supercapacitors

A large-scale of MoO3/PANI coaxial heterostructure nanobelts have been fabricated for high-performance supercapacitors via a simple and green approach without any surfactant. Herein, the assembly of PANI conductive layer on the surface of the well-crystallized α-MoO3 nanobelts was carried out using ammonium persulfate (APS) as oxidant by in-situ polymerization at room temperature. As-prepared MoO3/PANI coaxial heterostructure nanobelts have been successfully employed as supercapacitor electrodes. It was found that the as-synthesized MoO3/PANI coaxial heterostructure nanobelts exhibited excellent supercapacitor performance with high specific capacitances of 714 F g−1 at a scan rate of 1 mV s−1 and 632 F g−1 at a current density of 1 A g−1 in 1 M H2SO4 electrolyte, whereas the original α-MoO3 nanobelts just showed initial specific capacitances of 275 F g−1 and 267 F g−1 at 1 mV s−1 and 1 A g−1, respectively, which attributed to the synergic effect between the PANI coating and the original α-MoO3 nanobelts.