Electrochemical Capacitance of a Nanoporous Composite of Carbon Nanotubes and Polypyrrole

Abstract

This work reports the supercapacitive properties of electrochemically grown composite films of multiwalled carbon nanotubes (MWNT) and polypyrrole (PPy), a conducting polymer. Scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy revealed that the nanoporous three-dimensional arrangement of PPy-coated MWNTs in these films facilitated improved electron and ion transfer relative to pure PPy films. The low-frequency capacitance was measured for films of varying thickness, revealing specific capacitances per mass (C mass) and geometric area (C area) as high as 192 F g-1 and 1.0 F cm-2, respectively. Rates of charge and discharge about an order of magnitude faster than similarly prepared pure PPy films were also observed.

Preparation and properties of plasticized starch/multiwalled carbon nanotubes composites

“…27 Therefore, they have been considered as ideal reinforcing fillers for polymer matrixes to achieve high performance and extensive applications since the discovery of carbon nanotube in 1991 by Iijima. [28][29][30] The most common methods, such as melt-blending and solution-casting, which are developed for making polymer composites with inorganic fillers, are also adopted for making MWCNTs-enhanced polymer composites. [31][32][33][34] It is well known that the effective utilization of MWCNTs in composite applications depends strongly on the ability to disperse the MWCNTs homogeneously throughout the matrix without destroying the integrity of the MWCNTs.…”

“…35 However, the nonreactive surface of MWCNTs usually limits their applications in composites because of a lack of adhesion between MWCNTs and polymer matrix. In the past decade, some efforts to improve dispersibility of MWCNTs have been explored, including the use of surfactants, 29 oxidation, or chemical functionalization of the MWCNTs surface. 36,37 For instance, introduction of carboxylic, carbonyl, and hydroxyl groups on MWCNTs by refluxing MWCNTs with nitric acid or mixed acid greatly enhanced their interaction with various polymer matrixes, thus improving the mechanical properties of the resulting composites.…”

Synthesis of Co_1&minus;<i>_x</i>Fe<i>_x</i> Hydroxide Nanoplatelets and Its Electrochemical Performances as Supercapacitor Electrode Materials

“…Hydrous ruthenium oxide has been shown to exhibit ideal pseudocapacitive behavior 4 and has a specific capacitance higher than 800 F g ¹1 . 5,6 However, Ru is hard to be accepted as an electrode material for electrochemical capacitors because of its high cost. This encourages people to find other cheaper materials with capacitive behavior similar to RuO 2 .…”

Proteção Do Alumínio 2024 Por Filmes De Polipirrol Depositados Em Ácido P-Tolueno Sulfônico

“…As propriedades físico-químicas do PPy, tais como estabilidade química/térmica, condutividade elétrica, baixa solubilidade do polímero em solventes orgânicos e em água, e a facilidade de síntese por métodos químicos e eletroquímicos o conferem destaque no campo da pesquisa (WANG; LI; YL, 2001; CASTAGNO; AZAMBUJA; DALMORO, 2009). A combinação dessas características com propriedades elétricas e ópticas levam o PPy à crescente aplicação tecnológica, destacando seu uso como material de eletrodo de supercapacitores (BAHLOUL et al, 2013;HASHMI;UPADHYAYA, 2002;TSAI;CHEN;DO, 2004), revestimento de compósito de nanotubos de carbono (HUGHES, et. al.…”