Facile synthesis of loosely assembled α‐MnO 2 nanofiber coated with GQD / PANI for enhancing capacity

Summary A new class α‐MnO 2 nanofiber‐based on assemblies of nanoparticles was synthesized to improve the availability of Mn atom for application in electrochemical storage. Furthermore, the effect of graphene quantum dots/polyaniline (GQD/PANI) on the structure and electrochemical performance of α‐MnO 2 nanofiber was investigated. The MnO 2 nanofiber combined with GQD/PANI showed a larger specific capacitance of 1022.5 F g −1 at 1.0 A g −1 comparing to other MnO 2 ‐based electrode materials. The result was attributed to α‐MnO 2 nanofiber with loosely assembled structure and GQD/PANI with good conductivity, providing more electrochemical active sites and reducing internal resistance. The working does not only report new MnO 2 ‐based electrode materials with high performance but also provides a facile method to synthesize α‐MnO 2 nanofiber with a loosely assembled structure for various applications.