Polyaniline/carbon black composite as Pt electrocatalyst supports for methanol oxidation: Synthesis and characterization

Abstract

Core/shell composites of polyaniline (PANI) and Vulcan XC-72 Carbon (VC), in which the carbon represents the core and PANI forms the shell, were synthesized by in situ chemical oxidation polymerization. Platinum (Pt) particles were then deposited on the PANI/ VC composites by chemical reduction method. The highest conductivity is obtained when a mass ratio of PANI/VC equals to 0.28, as proved by Fourier transform infrared spectra. And it is also proved that there are some reactions happened between PANI and VC. Scanning electron microscope, transmission electron microscope, and X-ray diffraction measurements were performed to analyze their structure and surface morphology. It has been observed that the Pt particles are smaller in size and more uniformly distributed on these composite supports than on pure VC supports, considered as a reference. Methanol oxidation performed on the electrode modified by such a composite catalyst has been measured by cyclic voltammogram focusing on the attenuation of methanol oxidation current after 200 cycles. The attenuation degree for the composite catalyst is only one-third of the one measured for a simple Pt/VC catalyst. It is proved that the composite catalyst better resist carbon monoxide poisoning in comparison with the Pt/VC catalyst, which may be due to the synergetic effects between the composite support and the Pt catalyst.

Synthesis and effect of secondary dopant on the conductivity of conducting polymer polyaniline

“…The IR spectra of ES samples treated with higher cation radical and emeraldine to pernigraniline transitions. The highest current densities corresponding to the anodic peaks are observed in H 2 SO 4 than in HCl, which is also supported by different authors [26,32,33]. Thus, the CVs clearly reveal the formation of electroactive PANI polymer films in both supporting electrolytes.…”

“…The conductivity and electrical properties were done by using the digital multimeter with lead metal roads inserted in the solutions and also using pH-ISE [32]. Then, the current-voltage measurements were done using the two-point probe method and resistivity measurements were carried out by using equation given below.…”

Preparation of Platinum‐Poly(O‐dihydroxybenzene) Composite Catalyst and Its Electrocatalytic Activity Toward Methanol and Formic Acid Oxidation

“…It has been reported that conducting polymers (CPs) could behave as a suitable host material for dispersing metallic particles [15][16][17][18]. Most literatures showed that the enhanced activity of Pt-based catalysts on CPs for the oxidation of organic molecules is associated with their high surface area and the synergistic effect between CPs and Pt catalysts [19][20][21].…”

A simple degradation method for sulfur mustard at ambient conditions using nickelphthalocyanine incorporated polypyrrole modified electrode

“…Conducting polymers have been extensively used since last four decades as novel materials for potential applications in various electrochemical devices including actuators (Shoa et al 2010), chemical and biosensors (Koh et al 2010), capacitors (Lee et al 2010) and electrocatalyst (Qu et al 2010). The most commonly applied polymers for sensing applications have been based on polypyrrole (pPy), polyaniline (PANI), polythiophene (PTP) and their derivatives (Pirsa and Alizade 2010).…”