Enhancementofelectrochemical energystorageperformanceof MOF-5andEucalyptusplantbarkderivedrGOcomposite
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Date
2025
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Abstract
MetalOrganicFrameworks(MOFs)andcarbonderivativesbasedcompositesareaninterestingclass
of materialshavingcomplementaryproperties,withthehighsurfaceareaandtunableporosityof
MOFstogetherwithexcellentelectricalconductivityofcarbonbasedmaterials.Herein,wereporta
facile onestepsolvothermalsynthesisofcompositemadeofMOF-5andEucalyptusbarkderived
rGO.MOF-5/rGOcomposite(MRG)hasahighspecificsurfacearea(1150m2g−1).MRGwasstudied
for electrochemicalenergystorageapplicationusingCycleVoltammetry(CV),GalvanostaticCharge
Discharge(GCD)andElectrochemicalImpedanceSpectroscopy(EIS).TheMRGhashighspecific
capacitanceof1366.6 F g−1ascalculatedbyGCDat1Ag−1currentdensity,Energydensityof
150.7 Whkg−1andPowerdensityof450.3Wkg−1atacurrentdensityof1Ag−1ascalculatedby
GCDwith1MH2SO4.ThecoulombicefficiencyfortheMRGcompositewasfoundtobe89.3%at
highercurrentdensity.Thecyclicstabilitydatashownthatcompositematerialisretaining∼80.9%
capacitanceevenafter10000cycles.Moreover,symmetricaltwoelectrodedeviceofMRGshowna
specificcapacitanceof262.4 F g−1atacurrentdensityof1Ag−1,whilethedeviceretained83.7%
capacitanceafter10000chargingdischargingcycles.Theenergydensityandpowerdensityof
devicewerefoundtobe36.4Whkg−1and498.6Wkg−1atacurrentof1Ag−1.Theenhanced
electrochemical performanceofMRGisattributedtothesynergisticeffectbetweenMOF-5andrGO
leadingtotheenhancedconductivityandprovideslargersurfaceareaforchargestorage.