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Title: Particle size effect of silver nanoparticles decorated single walled carbon nanotube electrode for supercapacitors
Authors: Wee, G.
Mak, W.F.
Phonthammachai, N.
Kiebele, A.
Reddy, M.V. 
Chowdari, B.V.R. 
Gruner, G.
Srinivasan, M.
Mhaisalkar, S.G.
Issue Date: 2010
Citation: Wee, G., Mak, W.F., Phonthammachai, N., Kiebele, A., Reddy, M.V., Chowdari, B.V.R., Gruner, G., Srinivasan, M., Mhaisalkar, S.G. (2010). Particle size effect of silver nanoparticles decorated single walled carbon nanotube electrode for supercapacitors. Journal of the Electrochemical Society 157 (2) : A179-A184. ScholarBank@NUS Repository.
Abstract: Well dispersed silver nanoparticles (AgNPs) of different sizes (1-13 nm) on single walled carbon nanotubes (SWCNTs) were synthesized by a facile room-temperature deposition-precipitation process. The morphology and microstructure of samples examined by the transmission electron microscopy showed a monodispersed silver particle decorated SWCNT of 2 wt % as determined by the Rietveld phase analysis of powder X-ray diffraction patterns. The chemical state of silver determined from the binding energies of high resolution Ag 3d peaks from X-ray photoelectron spectroscopy revealed a silver (Ag 0) oxidation state. Electrochemical properties were studied using cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance studies. Silver decorated SWCNTs demonstrated to be effective bifunctional charge collectors and active electrode materials for a supercapacitor, exhibiting a higher specific capacitance (106 F g-1) compared to pristine SWCNT (47 F g-1). An enhancement observed with AgNP decoration is highly size-dependent and is related to the improved intertube contact resistance, electroactive surface considerations, as well as the participation of Ag in a faradaic reaction induced pseudocapacitance. Decorating the SWCNT with 1 nm AgNP doubled the energy density of the device, which on charge-discharge cycling retained 84% of the initial capacitance at the end of 8000 cycles. © 2009 The Electrochemical Society.
Source Title: Journal of the Electrochemical Society
ISSN: 00134651
DOI: 10.1149/1.3267874
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