Facile synthesisof a-MnO2 nanorods forhigh-performancealkalinebatteries Nian Tang,XikeTian n, ChaoYang,ZhenbangPi,QingHan

摘要

Single-crystalline a-MnO2 nanorodshavebeensuccessfullysynthesizedbyanovelhydrothermal method basedontheredoxreactionsbetweenthepermanganateanionMnO4 – and H2O inmixturecontainingKMnO4 and HNO3. TheproductshavebeencharacterizedbypowderX-raydiffraction(XRD), scanningelectronmicroscopy(SEM),energy-dispersiveX-rayspectroscopy(EDX),transmissionelectronmicroscopy(TEM),Fouriertransforminfraredspectrum(FT-IR)andBrunauer–Emmett–Teller(BET).Theresultsprovethatthegrainsizeof a-MnO2 nanorodswiththesurfacearea 95.2 m2 g1 is homogeneouswithdiametersrangingfrom10to20nm.Theelectrochemicalpropertyofthematerialshowsthatcomparedwiththecommercialelectrolyticmanganesedioxide(EMD),thedischargecapacity oftheas-prepared a-MnO2 nanorods isincreasedby70.4%,104.1%and135.7%atdifferent constantcurrentsof50,250and500mAg1, respectively.