Synthesis and electrochemical characterization of carbon nanotubes decorated with nickel nanoparticles for use as an electrochemical capacitor |
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Authors: | Chien-Te Hsieh Yun-Wen Chou Wei-Yu Chen |
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Institution: | (1) Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan, 320, Taiwan;(2) Yuan Ze Fuel Cell Center, Yuan Ze University, Taoyuan, 320, Taiwan |
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Abstract: | Attachment of nickel nanoparticles on multiwalled carbon nanotubes (MWCNTs) was conducted to explore the influence of Ni loading
on the electrochemical capacitance of MWCNT electrodes. A chemical impregnation leaded to homogeneously disperse Ni particles
onto the surface of MWCNTs, and the Ni particles were found to be an average size of 30–50 nm. The capacitive behavior of
the MWCNT electrodes was investigated in 6 M KOH, by using cyclic voltammetry (CV), charge–discharge cycling, and ac electrochemical
impedance spectroscopy. CV measurements showed that the Faradaic current was found to increase with the Ni coverage, indicating
that the presence of Ni would enhance the pseudocapacitance through the redox process. Equivalent circuit analysis indicated
that both of electrical connection and charge transfer resistances accounted for the major proportion of the overall resistance
and were found to decrease with the amount of nickel. A linearity relationship between the total capacitance and the Ni population
reflected that each Ni particle exhibits an identical electrochemical activity in enhancing the electrochemical capacitance.
The overall electrochemical capacitance (including double layer capacitance and pseudocapacitance) of Ni-MWCNT electrode can
reach a maximum of 210 F/g over 500 cycles. |
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Keywords: | Carbon nanotubes Electric double-layer capacitance Nickel nanoparticle Pseudocapacitance ac electrochemical impedance |
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