简介：Anovelbirdnest-likenanostructuredMnO2(BNNS-MnO2)waspreparedbyafacileandcost-effectivestrategy.Theirstructuresandmorphologieswerecharacterizedbyfieldemissionscanningelectronmicroscopy,transmissionelectronmicroscopyandpowderX-raydiffraction.Capacitivebehaviorswereinvestigatedbycyclicvoltammetryandgalvanostaticcharge-discharge.Theobtainednano-MnO2possessesawelldesignedloose-assembledhierarchicalnanoarchitecturewithanappropriatecrystallinitywhichgivesrisetoexcellentperformancesasanelectrodematerialforsupercapacitors.Amaximumspecificcapacitanceof917F/ghasbeenobtainedatacurrentdensityof5mA/cm2in6mol/LKOHaqueoussolution,andaspecificcapacitanceof210F/ghasbeenmaintainedfor500cycles.AsthelowcostofMnSO4andKCr2O7andthelowreactiontemperature,thepresentmethodavoidstherequirementsforcomplicatedoperations,time/energy-consumingandexpensivereagents,andperhapsisreadyfortheindustrializationofnano-MnO2production.
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