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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/25404

Title: Surface Modifications of Nanocarbon Materials for Electrochemical Capacitors
Authors: Akter, Tahmina
Advisor: Lian, Keryn
Department: Materials Science and Engineering
Keywords: Nanocarbon
Electrochemical Capacitor
Polyoxometaltes
Layer by Layer Deposition
Pseudocapacitance
MWCNT
Issue Date: 14-Dec-2010
Abstract: Multi-walled carbon nanotubes (MWCNTs) were successfully coated with two different pseudocapacitive polyoxometalates (POMs) (SiMo12O40-4 (SiMo12) and PMo12O40-3 (PMo12)) via “Layer-by-Layer” deposition. Even with merely a “single-layer” of POM, the modified nanotubes exhibited more than 2X increase in capacitance compared with that of bare nanotubes. To further improve their electrochemical performances, the deposition sequence of the POM layers was adjusted to form “alternate layer” coating to modify MWCNT. A synergistic effect on the capacitance and kinetics was observed with the alternate layer coatings. X-ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscopy (SEM) also proved the successful coating of POMs on MWCNTs. The potential-pH relationship provided important insights in terms of the deposition mechanism and suggested that the bottom layer close to the electrode substrate was the dominating layer in alternate layer coated MWCNT electrodes.
URI: http://hdl.handle.net/1807/25404
Appears in Collections:Master
Department of Materials Science & Engineering - Master theses

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