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Nanoscale Blended MnO2 Nanoparticles in Electro-polymerized Polypyrrole Conducting Polymer for Energy Storage in Supercapacitors

Published online by Cambridge University Press:  24 May 2013

Navjot K Sidhu  and
A.C. Rastogi
Navjot K Sidhu
Affiliation:
Electrical and Computer Engineering Department, Center for Autonomous Solar Power (CASP), Binghamton University, State University of New York, Binghamton, NY 13902, U.S.A.
A.C. Rastogi
Affiliation:
Electrical and Computer Engineering Department, Center for Autonomous Solar Power (CASP), Binghamton University, State University of New York, Binghamton, NY 13902, U.S.A.
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Abstract

Polypyrrole (pPy) conducting polymer films embedded with MnO2 nanoparticles have been synthesized by electrochemical polymerization and anodic oxidation processes. MnO2 nanoparticles coexist in the hydrated Mn(II) and Mn(IV) states and undergo valence state change along side pPy anion doping-dedoping contributing to the system pseudocapacitance. Increased density of sequestered MnO2 nanoparticles in pPy significantly improves charge storage properties as shown by increased electrodic specific capacitance from 200 to 620 Fg-1 based on cyclic voltammetry studies. MnO2 nanoparticle dispersion in open porous pPy microstructure is affected by current density in excess of 4 mA.cm-2 used in synthesis and results in MnO2 particle agglomeration that excludes open surface access reducing specific capacitance. Charge-discharge studies show stable capacitance retention for ∼1000 cycles. The redox performance of MnO2-pPy composite electrodes is suitable for application in the high energy density supercapacitors.

Keywords

blendelectrodepositionenergy storage
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1552: Symposium S – Nanostructured Metal Oxides for Advanced Applications , 2013 , pp. 11 - 16
Copyright
Copyright © Materials Research Society 2013 

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