TEMPLATE SYNTHESIZED NANOTUBES, NANOWIRES AND HETEROGENEOUS COAXIAL NANOWIRES FOR ELECTROCHEMICAL ENERGY STORAGE

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2009

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Abstract

Template synthesized nanomaterials have been successfully applied in

electrochemical energy storage systems such as supercapacitors and lithium ion

batteries. The first part of present study will list examples of applying various

nanomaterials such as nanowires, nanotubes and heterostructured nanowires in

different electrochemical energy storage systems for enhancing their charge/discharge

rates, energy densities and power densities, etc. The following of the thesis will

describe the template synthesis of nanomaterials in details. The experimental part of

this thesis will concentrate on the fabrication of alumina template and the detailed

experimental setups for aluminum anodization and template synthesis of

nanomaterials. The rest of the thesis analyzes four cases of using template

synthesized nanomaterials in electrochemical energy storage, which include my major

work during my PhD studies. The first one is utilizing poly(3,4-

ethylenedioxythiophene) (PEDOT) nanotubes as electrode materials for highpowered

supercapacitor. The thin-walled nanotubes allow fast charge/discharge of the

PEDOT to achieve high power. The second one is related to synthesis and

characterization of RuO2/PEDOT composite nanotubes for supercapacitors. Loading

appropriate amount of RuO2 can effectively enhance the specific capacitance of

PEDOT nanotube. The third case illustrates the synthesis of MnO2/PEDOT coaxial

nanowires by one step coelectrodeposition for electrochemical energy storage. The

combined properties of MnO2 and PEDOT enable the coaxial nanowires to have very

high specific capacitances at high current densities. Their formation mechanism will

be explored and their nanostructures are tuned for optimized electrochemical

properties. The final case reports the MnO2-Nanoparticles enriched PEDOT

nanowires for enhanced electrochemical energy storage capacity. Large amount of the

MnO2 nanoparticles can be loaded into PEDOT nanowires after they are soaked in

KMnO4 solution. Thus loaded MnO2 nanoparticles effective enhance the energy

densities of PEDOT nanowires without causing too much volume expansion to them.

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