Enhanced Catalytic Activity of Pt-NdFeO3 Nanoparticles Supported on Polyaniline-Chitosan Composite Towards Methanol Electro-Oxidation Reaction (original) (raw)
Related papers
2019
Current catalysts for the methanol oxidation in fuel cells (typically noble metals-based) are susceptible to poisoning with intermediates like CO. Hence superseded catalysts have been desirable for methanol oxidation based on incorporation of mixed oxides. The different types of nanocomposites have been prepared with Pt nanoparticles (PtNPs), functionalized CNTs, perovskite NdFeO3 nanoparticles (NdFeO3NPs) and chitosan (CH) polymer and their catalytic activity toward methanol oxidation have been investigated by the electrochemical studies. The equations of current density versus time are obtained via the fitting and simulation of experimental data. In the following, the amount of transferred charge during methanol oxidation versus time has been calculated through the lower Riemann sum of curve correspond to experimental data and the integration of mentioned equations both. A direct methanol fuel cell (DMFC) is designed, assembled and tested with the suggested PtNPs-CNTs-NdFeO3NPs-CH...
Applied Nanoscience, 2012
A microwave reduction route was employed for the synthesis of Pt nanoparticles supported on multi-walled carbon nanotubes (MWCNT). The as-prepared Pt-MWCNT electrocatalysts were characterized by FT-IR, XRD and TEM analysis. Further, the as-prepared catalysts were probed for its electrocatalytic activity towards methanol oxidation by cyclic voltammetry (CV) in 0.5 M CH 3 OH ? 0.5 M H 2 SO 4 solution. Two kinds of electrocatalysts viz. Pt-MWCNT and Pt-MWCNT/PANI were probed to study the effect of both carbon nanotubes and polyaniline (PANI) towards methanol oxidation. The effect of scan rate, concentration and long-term cycle stability analysis has been investigated in detail. Results show that the presence of MWCNT and PANI improves the electrocatalytic efficiency towards methanol oxidation. Pt-MWCNT/PANI shows high peak current density towards methanol oxidation and good long-term stability even after 600 cycles indicating that the catalyst could be used for practical applications.
ACS Omega, 2018
Herein, perylene-3,4,9,10-tetracarboxylic acid-doped polyaniline (PTP) nanofibers with/without photoreactive anatase TiO 2 (TiO 2 −PTP and PTP, respectively) have been successively synthesized and subsequently decorated by Pt nanoparticles (Pt NPs) to prepare Pt− PTP and Pt−TiO 2 −PTP composites. High-resolution transmission electron microscopy confirms the presence of ∼3 nm spherical-shaped Pt NPs on both the composites along with TiO 2 on Pt−TiO 2 −PTP. Pt loading on the composites is deliberately kept similar to compare the methanol electro-oxidation in the two composites. The Pt nanocomposites along with the precursor polyanilines are characterized by optical characterization, X-ray diffraction study, X-ray fluorescence spectroscopy, and Raman spectroscopy. The ternary composite-modified (Pt−TiO 2 −PTP) electrode demonstrates high electrocatalytic performance for methanol oxidation reaction in acid medium than Pt−PTP and Pt−TiO 2. The higher electrochemical surface area (1.7 times), high forward/backward current ratio, and the higher CO tolerance ability for Pt−TiO 2 −PTP make it a superior catalyst for methanol oxidation reaction in the electrochemical process than Pt−PTP. Moreover, the catalytic activity of Pt−TiO 2 −PTP is further enhanced significantly with light irradiation. The cooperative effects of photo-and electrocatalysis on methanol oxidation reaction in Pt−TiO 2 −PTP enhance the methanol oxidation catalytic activity approximately 1.3 times higher in light illumination than in dark. Therefore, the present work will be proficient to get a light-assisted sustainable approach for developing the methanol oxidation reaction activity of Pt NPcontaining catalysts in direct methanol fuel cells.
Synthetic Metals, 2018
An electrochemical method was successfully used for the Pd nanoparticles deposition on the Polyaniline/titanium dioxide (PANI/TiO 2) modified glassy carbon (GC) electrode. The electrochemical activity of fabricated palladium/Polyaniline/titania (Pd/PANI/TiO 2) electrocatalyst was investigated for methanol electrooxidation by cyclic voltammetry (CV) and chronoamperomtery (CA) in alkaline media. Also, the effect of different methanol concentrations and potential sweep rates were in two separate set of experiments. The prepared samples were characterized by field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX) and Fourier transform infrared spectroscopy (FTIR) techniques. Obtained results indicated that the synthesized Pd/PANI/TiO 2 catalyst not only possessed much higher electrochemically active surface area (EASA) than that of the pure Pd catalyst, but also enhanced the forward anodic peak current density (J f) for methanol electrooxidation reaction. These observations are extracted from the combination of high charge transfer of the PANI/TiO 2 nanocompsites and excellent catalytic characteristic of the Pd catalyst.
High-Performance Electrocatalytic Activity of Pt Nanoparticles/Chitosan 3-D Nanocomposites
A novel kind of hybrid nanocomposites containing Pt nanoparticles (PtNPs) and Chitosan (CS) have been fabricated based on the PtNPs inserting into the porous structure of CS on the surface of glassy carbon electrode (GCE). Transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectra and several electrochemical techniques, such as cyclic voltammetry (CV), chronoamperometry, and electrochemical impedance spectroscopy (EIS), have been used to characterize PtNPs/CS modified electrode. Electrocatalytic experiments show that these uniform nanocomposites can greatly decrease the over-potential and increase the peak current in the methanol oxidation and oxygen reduction. In comparison with the results reported previously, the PtNPs-CS nanocomposites have excellent electrocatalytic activity towards the oxidation of methanol and reduction of oxygen, which can be utilized to develop new fuel cell with high performance.
Synthetic Metals, 2008
This study reports on the preparation of Pt-and Ru-based electrocatalysts through electrodeposition of Pt and Ru particles into the nanofibrous network of polyaniline (PANI)-poly(styrene sulfonic acid) (PSS). The sequence of electrodeposition of Pt and Ru particles was changed and the electrocatalysts, PANI-PSS-Pt-Ru and PANI-PSS-Ru-Pt, were obtained. Scanning electron microscopy (SEM), X-ray photoelectron microscopy (XPS), and cyclic voltammetry (CV) were employed to investigate the morphology, structural and electrochemical properties of the electrocatalysts, PANI-PSS-Pt-Ru and PANI-PSS-Ru-Pt. The distribution of Pt and Ru particles into PANI-PSS matrix was analyzed by the Auger depth profiles. The electrochemical behavior PANI-PSS-Pt-Ru and PANI-PSS-Ru -Pt and the electrocatalytic behavior toward oxidation of methanol were evaluated by cyclic voltammetry. PANI-PSS-Ru-Pt exhibited a superior electrocatalytic performance for methanol oxidation as compared to PANI-PSS-Pt-Ru.
Pt particles supported on conducting polymeric nanocones as electro-catalysts for methanol oxidation
Journal of Power Sources, 2004
The electrochemical synthesis of conducting nanocones of Pt incorporated poly(3-methyl) thiophene, employing alumina membrane templates and its use as an electrode material for methanol oxidation is reported. The activity (131 mA/cm 2 at +0.4 V versus Ag/AgCl for a Pt loading of 80 g/cm 2 ) of nanocone-based electrode was found to be more than one order of magnitude higher compared to the regular poly(3-methyl) thiophene electrode (12.2 mA/cm 2 at +0.4 V versus Ag/AgCl for a Pt loading of 80 g/cm 2 ). The chronoamperometric response confirms the better activity and stability of the nanocone-based electrode compared to the commercial 20 wt.% Pt/C (E-TEK) and template-free electrode. The XPS data confirmed the presence of Pt in the metallic state. The nanocone morphology of poly(3-methyl) thiophene, helps in the effective dispersion of Pt particles facilitating the easier access of methanol to the catalytic sites.
Journal of Power Sources, 2008
Preparation and characterization of a platinum (Pt)-based catalyst using a redox polymer, poly(vinylferrocenium) (PVF +), as the support material was described. Pt was obtained from aqueous solution of K 2 PtCl 4 in the complex form. Pt particles were reduced by chemical and electrochemical means. Chemical reduction was performed using aqueous hydrazine solution and electrochemical reduction was carried out in H 2 SO 4 solution. The Pt/PVF + catalyst system showed catalytic activity towards methanol oxidation. Cyclic voltammetry was used for the electrochemical characterization of the catalyst system. Scanning electron microscopy (SEM) images and energy dispersive X-ray spectrum (EDS) of the catalyst system were also recorded. The system was tested in a single fuel cell configuration at ambient temperature and atmospheric pressure. The open circuit voltage (OCV) was 680 mV for the system and the maximum power density was 0.31 mW cm −2 at a current density of 0.63 mA cm −2. Catalytic activity of Pt/PVF + system towards methanol oxidation was comparable with the related catalysts in the literature.
International Journal of Hydrogen Energy, 2011
Three different electrodes containing polyaniline (PANI) and platinum (Pt) nanoparticles were fabricated. Polyaniline was coated onto TGPO60-T by carrying out the electropolymerization of aniline and trifluoromethane sulfonic acid as the proton-conductive monomer, and platinum was electroreduced onto the carbon paper based electrodes (with or without polyaniline) that are used in direct methanol fuel cells (DMFCs). The efficiencies of these electrodes in methanol oxidation were examined and their electrochemical properties were investigated with cyclic voltammetry, chronoamperometry, linear sweep voltammetry, and electrochemical impedance spectroscopy. The surface morphologies of the electrodes were characterized by using scanning electron microscopy. The electro-oxidation reaction on the Pt-PANI/carbon paper catalyst with a thick layer of polyaniline has a much lower activation energy than on the Pt/carbon paper catalyst and on the Pt-PANI/carbon paper catalyst with a thin layer of polyaniline. Our results also show that the electrode with a thick polyaniline layer is more efficient than the electrodes with a thin polyaniline layer or without polyaniline.