Enhanced electrocatalytic performance of platinum nanoparticles on thiolated polyaniline-multiwalled carbon nanotubes for methanol oxidation

Abstract

Pt nanoparticles (PtNPs) well-dispersed on thiolated polyaniline (TPANI)-multiwalled carbon nanotubes (MWCNTs) were prepared for enhanced electrocatalytic oxidation of methanol in acidic media. Briefly, the preparation of nanocomposites was carried out via microwave-assisted thiol-ene reaction of 2,5dimercapto-1,3,4-thiadiazole (DMcT) with oxidized PANI, which was synthesized in the presence of MWCNTs, yielding TPANI-MWCNTs; then, PtNPs were deposited on TPANI-MWCNTs by a microwaveassisted method to obtain PtNPs/TPANI-MWCNT nanohybrids. Fourier transform infrared spectroscopy, cyclic voltammetry (CV), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and inductively coupled plasma-atom emission spectroscopy were used to study relevant nanohybrid properties. TEM showed that PtNPs were well dispersed on TPANI-MWCNTs. TGA showed that PtNPs/TPANI-MWCNTs exhibited better thermal stability than PtNPs/TPANI-MWCNTs and PtNPs/MWCNTs. CV studies showed that PtNPs/TPANI-MWCNT-modified glassy carbon electrode (GCE) exhibited a larger electrochemically active surface area and higher electrocatalytic performance toward methanol electro-oxidation compared with those of PtNPs/PANI-MWCNTs/GCE and PtNPs/MWCNTs/GCE. Also, the PtNPs/TPANI-MWCNTs/GCE electrode possessed high stability and maintained 86% of its initial catalytic activity after 1000-cycle CV in 1.0 M CH 3 OH + 0.5 M H 2 SO 4 .

Oxygen reduction performance study of Fe/Ni doped PAAM/Agar double net hydrogel carbon materials

“…[7] This phenomenon is associated with electrical conductivity, larger surface area and specific active components pyridine N, graphite N and FeÀ NÀ C. [7][8] Furthermore, Pt nanoparticles combined with transition metals or alloys optimize their structure and reduce their use. [9] Hydrogels are good templates for the preparation of porous carbon due to their special network structure and spatial configuration. In recent years, it has become an efficient method to produce hydrogels employing biological material, particularly polysaccharides, which is a promising approach.…”

Stabilization of Ultrasmall Platinum Nanoparticles by Nitrogen-Doped Carbon: Implications for Catalysis and Electrocatalysis

“…Heterogeneous materials comprising Pt NPs on carbon supports have numerous applications including fuel cell electrodes − and catalysts for hydrogenation − and oxidation − reactions. To enable future applications, it will often be critical to maximize the number of active catalytic sites per mass of Pt by minimizing the size of the nanoparticles .…”

Synthesis and characterization of corannulene-metal-organic framework support material for palladium catalyst: An excellent anode material for accelerated methanol oxidation

“…Besides, it shows resistance to poisoning and shows excellent electro-catalytic activity along with long term stability. The fabrication of electrocatalysts in DMFCs involves the use of several support materials such as operation, carbon black, carbon nanotubes, carbon nanofiber, nitrogen-doped porous carbon nano-spheres, graphite nanofibers, fullerene, metal-organic framework (MOF) [18][19][20][21][22][23]. Here, we show for the first time that corannulene, a bowl-shaped polycyclic aromatic hydrocarbon, is a new candidate for the carbon-based palladium support material in the fuel cell applications [24][25][26][27].…”