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|Title:||Particle size effect of silver nanoparticles decorated single walled carbon nanotube electrode for supercapacitors||Authors:||Wee, 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. https://doi.org/10.1149/1.3267874||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||URI:||http://scholarbank.nus.edu.sg/handle/10635/97495||ISSN:||00134651||DOI:||10.1149/1.3267874|
|Appears in Collections:||Staff Publications|
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