Tailoring the supercapacitance of Mn_2O_3 nanofibers by nanocompositing with spinel-ZnMn_2O_4

摘要

Mn2O3 is a pseudocapacitive material and a valuable member of the MnOx family with a theoretical specific capacitance of similar to 600 Fg(-1). Despite its good material properties, low electronic conductivity (10(-5) Scm(-1)) limits their usage in supercapacitor industries especially in high rate applications. To improve the material properties, Mn2O3 (NFs) composited with ZnMn2O4 (ZMO) were synthesised using a cost-effective electrospinning method and the resultant nanofibers were characterised by larger surface active reaction sites and enhanced charge-transfer kinetics. Phase fraction of ZMO in Mn2O3 NFs, for getting maximumspecific capacitance was optimised as 1 wt%. About 98% of the capacitance (82 Fg(-1)) was retained after 3000 cycles at a higher current density of 20 Ag-1. Mn2O3 NFs and their composites are susceptible to electrochemical activation during charge-discharge cycles and cycling-protocol for maximum specific capacitance was found out. Nanofibers and their composites synthesised via electrospinning gives substantial hope in fiber based supercapacitor technology. (C) 2017 Published by Elsevier Ltd.