Potential of Silver Nanoparticles Functionalized Polyaniline as an Electrochemical Transducer

Khesuoe, Malefetsane; Matoetoe, Mangaka; Okumu, Fredrick

doi:10.4028/www.scientific.net/JNanoR.44.21

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HomeJournal of Nano ResearchJournal of Nano Research Vol. 44Potential of Silver Nanoparticles Functionalized...

Potential of Silver Nanoparticles Functionalized Polyaniline as an Electrochemical Transducer

Abstract:

Modification of commercial platinum (Pt) and glassy carbon (GC) electrodes with polyaniline (PANI) and silver nanoparticles doped polyaniline (PANI/Ag NPs) through electropolymerization of aniline in the absence and presence of Ag NPs in 1 M hydrochloric acid (HCl) was interrogated. Fourier transform infrared (FTIR) and transmission electron microscope (TEM) techniques were used for structural, compositional and morphological elucidation. FTIR spectra for PANI and PANI/Ag NPs had the characteristic PANI functional groups as well as desired bands for the conducting emeraldine (EM) form. The predominance of the PANI pattern in the spectra is indicative of the intact PANI structure in the presence of Ag NPs while the slight band shifts are signify interfacial interactions between PANI and Ag NPs. TEM micrograms depicts different size one dimensional nanofibric tubes of the supramolecular structures of PANI. Ag NPs functionalized PANI had larger smoother tubes, suggesting organized morphology arrangement. An increased energy dispersive spectroscopy (EDS)-TEM count from 256 to 277 confirms incorporation of Ag NPs in PANI. GC/PANI/Ag NPs exhibited outstanding electroactivity (higher conductivity and rate of electron transfer).This might be a result of the large surface coverage, film thickness and diffusion coefficient as a result of the large GC surface area. Possibly, the improvement might be due to the GC electrode properties. The electroactivity of the electrodes increased in the order: Pt < GC < Pt/PANI < Pt/PANI/Ag NPs < GC/PANI < GC/PANI/Ag NPs. The effect of Ag NPs in the polymer was demonstrated by ultimate band gap reduction of PANI and enhanced magnitudes of current response per electrode.

Info:

Periodical:

Journal of Nano Research (Volume 44)

Main Theme:

Journal of Nano Research Vol. 44

Edited by:

Emmanuel Iheanyichukwu Iwuoha and Priscilla Gloria Lorraine Baker

Pages:

21-34

DOI:

https://doi.org/10.4028/www.scientific.net/JNanoR.44.21

Citation:

M. Khesuoe et al., "Potential of Silver Nanoparticles Functionalized Polyaniline as an Electrochemical Transducer", Journal of Nano Research, Vol. 44, pp. 21-34, 2016

Online since:

November 2016

Authors:

Malefetsane Khesuoe, Mangaka Matoetoe *, Fredrick Okumu

Keywords:

Electrochemical Transducer, Polyaniline, Silver Nanoparticles

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Abstract: The surface properties of carbon film electrode sensors covered by coating with Nafion polymer film, before and after electrochemical analysis of sub-micromolar traces of lead and cadmium ions, were investigated. These protective polymer films are applied to the electrode surfaces to prevent the irreversible adsorption of chemical species, such as proteins and surfactants present in natural media, which leads to a decrease in response. Electrochemical impedance spectroscopy and voltammetric techniques were used for characterisation. The effect of non-ionic surfactant molecules in solution on the behaviour of the polymer-coated electrode was also investigated. It is shown that permanent changes to the structure and morphology of the Nafion film and of the carbon-Nafion interface occur after deposition of the trace metal ions, an effect which is lessened in the presence of surfactant.

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Effect of LaCoO₃ Additive on the Electrochemical Behavior of Zinc Anode in Alkaline Solution

Authors: Rabat Boonpong, Attera Worayingyong, Marisa Arunchaiya, Atchana Wongchaisuwat

Abstract: The utilization of zinc anode for zinc-based battery is limited due to low cycling life, shape change and ZnO passivation on the electrode surface. The electrochemical behavior of zinc anode in the presence of the additives added to the electrodes or the electrolytes have been reported. In this work, LaCoO3 was used as an additive to improve the electrochemical properties of the zinc oxide anode. LaCoO3 synthesized by sol gel method (Schiff base complex) was added to zinc oxide powder (99.9%) with the weight ratio of 1:0.001, 1:0.002 and 1:0.003. The relative ZnO/LaCoO3 ratios were confirmed by particle induced x-ray emission (PIXE) technique.The electrochemical behavior of the ZnO/LaCoO3 electrodes in 6M KOH solution were investigated by voltammetry and electrochemical impedance spectroscopy (EIS). The cyclic voltammogram showed that ZnO/LaCoO3 gave higher anodic current and ZnO passivation delayed. The EIS spectra showed that charge transfer resistances of the ZnO/LaCoO3 anodes due to zinc oxidation were higher than that of ZnO electrode

596

Electrodeposition of PANI/MnO₂ Composite on SnO₂/Ti Substrate for Supercapacitor Electrode

Authors: Ya Kun Zhang, Jian Ling Li, Fei Gao, Xin Dong Wang

Abstract: A layer of MnO₂ was loaded between the SnO₂/Ti substrate and the layer of PANI via a potentiodynamic electrodeposition. Electrochemical tests such as cyclic voltammetry and galvanostatic charge/discharge were applied to investigate the performance of the electrodes. The morphologies of the electrodes were also observed to identify the effect of the MnO₂ layer. The specific capacitance of PANI with MnO₂ reached to 601.48 F g^-1 at a current density of 0.1 mA cm^-2, which is 1.69 times as that of PANI electrodes without MnO₂ layer. This gratifying result may due to the synergistic effect between MnO₂ layer and PANI.

1372

Electrochemical Properties of PANI/CNTs Composites Modified by Oxygen Plasma

Authors: Chen Li, Li Zhang, Kai Wang

Abstract: The PANI-CNTs composite material was synthesized through emulsion polymerization, and then the composite had been modified by the oxygen plasma to get the electrode material for super-capacitor. The influences of the modification time on the electrode material surface property and the electrochemical performance were investigated. And based on the analysis of the scanning electron microscope(SEM) and fourier transform-infrared spectroscopy (FT-IR), the results revealed that the particle size of the composite material become smaller, more micro pores were etched by the oxygen plasma and some active functional groups were introduced. The electrochemical tests demonstrated that the PANI/CNTs composite material modified by the oxygen material after 10 min has perfect capacitive properties, the specific capacitance is 287.8 Fg-1, and the ESR is 0.320 Ω.

1635

Preparation and Capacitive Properties of Polyaniline/Au Film

Authors: Qiu Ju Shan, Hai Rui Zhang, Ji Xiao Wang, Zhi Wang, Shi Chang Wang

Abstract: Polyaniline (PANI) doped with dodecylbenzene sulfonic acid (DBSA) was synthesized by chemical polymerization method, which was dissolved in toluene to prepare the casting solution (PANI, 0.20% w/w). Before casting the prepared solution on the surface of PET to form PANI films, Au was sprayed onto the PET film. The morphology of the obtained PANI/Au films was characterized by field-emission scanning electron microscopy (FE-SEM). The capacitive performance was characterized by cyclic voltammetry and galvanostatic charge-discharge technique in H2SO4 electrolyte under various conditions. The experimental results show that the specific capacitance of the prepared PANI/Au film can reach 280 Fg-1 in 0.50 M H2SO4 electrolyte within the potential range from 0.000 to 0.650 V vs. SCE. The obtained PANI/Au film has extremely high stability which has no obvious decrease for 30000 cycles.

231