Synthesis of α-MnO_2 Microspheres for the Application in Supercapacitor

Authors

Liang WANG, State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116012,Liaoning,China;
Gui-chang LIU, State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116012,Liaoning,China;
Zhi-cong SHI, State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116012,Liaoning,China;

Corresponding Author

Zhi-cong SHI(zhicong@gdut.edu.cn)

Abstract

The MnO2 microspheres were prepared through the oxidation of KMnO4 and MnCO3 microspheres precursor.The microstructure and supercapacitor properties of MnO2 were characterized by XRD,SEM and CV.The results show that MnO2 was in a poorly crystalline state with α-crystallographic form,the size of microspheres typically ranged from 0.5 to 2 μm.Loading 5 mg·cm-2 MnO2 microspheres had excellent capacitance behaviors in 2 mol·L-1(NH4)2SO4 solution.The specific capacitance was 135.6 F·g-1 with the scan rate at 2 mV·s-1,and 118.8 F·g-1 with the large scan rate at 100 mV/s.Coulumbic efficiency was still above 87.8% in the 500 cycles,and the specific capacitance of the 500th cycle was 110.5 F·g-1.

Keywords

dioxide manganese, microsphere, cyclic voltammetry, supercapacitor, agglomerate

DOI Link

https://doi.org/10.61558/2993-074X.2021

Publication Date

2009-11-28

Online Available Date

2009-11-28

Revised Date

2009-11-28

Received Date

2009-11-28

Recommended Citation

Liang WANG, Gui-chang LIU, Zhi-cong SHI. Synthesis of α-MnO_2 Microspheres for the Application in Supercapacitor[J]. Journal of Electrochemistry, 2009 , 15(4): 441-444.
DOI: 10.61558/2993-074X.2021
Available at: https://jelectrochem.xmu.edu.cn/journal/vol15/iss4/13

References

[1]Nagarajan N,Cheong M,Zhitomirsky I.Electrochemi-cal capacitance of Mnxfilm[J].Materials Chemistryand Physics,2007,103:47-53.
[2]Broughton J N,Brett M J.Variations in MnO2electro-deposition for electrochemical capacitors[J].Electro-chimica Acta,2005,50:4814-4819.
[3]Beaudrouet E,Le Gal La Salle A,Guyomard D.Nano-structured manganese dioxides:synthesis and propertiesas supercapacitor electrode materials[J].Electrochimi-ca Acta,2009,54:1240-1248.
[4]Devaraj S,Munichandraiah N.Effect of crystallographicstructure of MnO2on its electrochemical capacitanceproperties[J].J Phys Chem C,2008,112:4406-4417.
[5]Lee H Y,Goodenough J B.Supercapacitor behaviorwith KCl electrolyte[J].Journal of Solid State Chemis-try,1999,114:220-223.
[6]Toupin M,Brousse T,Belange D.Influence of micro-structure on the charge storage properties of chemicallysynthesized manganese dioxide[J].Chem Mater,2002,14:3946-3952.
[7]Toupin M,Brousse T,Belange D.Charge storagemechanism of MnO2electrode used in aqueous electro-chemical capacitor[J].Chem Mater,2004,16:3184-3190.
[8]Kuo S L,Wu N L.Investigation of pseudocapacitivecharge-storage reaction of MnO2.H2O supercapacitorsin aqueous electrolytes[J].Journal of the Electrochemi-cal Society,2006,153(7):A1317-A1324.