Platinum nanoparticles on porphyrin functionalized graphene nanosheets as a superior catalyst for methanol electrooxidation

Abstract

A novel nanostructured catalyst of platinum nanoparticles supported on 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin tetra(p-toluenesulfonate) (TMPyP) functionalized graphene (TMPyP-graphene) is synthesized by the hydrothermal polyol process. The as-synthesized nanocomposites are characterized by Fourier transform infrared (FTIR) spectroscopy, UV-vis absorption spectroscopy, Raman spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and electrochemical tests. It has been found that Pt nanoparticles of ca. 3.4 nm are uniformly dispersed on the surface of TMPyP-graphene, and hold a high electrochemical active surface area (ECSA) of 126.2 m(2) g(-1). The results demonstrate that the Pt/TMPyP-graphene catalyst exhibits a much higher electrocatalytic activity and stability than the Pt/graphene and commercial Pt/C catalysts for methanol oxidation, which is of significant importance in improving the efficiency of Pt-based electrocatalysts for DMFCs applications.

Fabrication of Nano Flower‐shaped Platinum on Glassy Carbon Electrode as a Sensitive Sensor for Lead Electrochemical Analysis

“…0.8 V and extends up to 1.2 V), and a single reduction peak at 0.5 V corresponding to the reduction of Pt(IV) to Pt(0) on the electrode surface. Our results were in agreement with other observational studies . Therefore, in order to deposit Pt onto GCE by chronoamperometry, the applied potential must be more negative than 0.3 V.…”

Polyethyleneimine-assisted synthesis of high-quality platinum/graphene hybrids: the effect of molecular weight on electrochemical properties

“…[1][2][3][4][5][6][7][8][9] Recently, graphene-supported PMNC hybrids have displayed improved electrocatalytic activity and stability for many important electrochemical reactions (such as ethanol oxidation, 10,11 methanol oxidation, [11][12][13] oxygen reduction reaction, 8,[14][15][16][17] and ethylene glycol oxidation 18 ) compared to un-supported PMNCs or active carbon supported PMNCs, attributed to the outstanding physical and chemical properties of graphene, such as superior electrical conductivity (10 3 to 10 4 S m À1 ), large surface area (2630 m 2 g À1 ), excellent chemical stability, etc.). [1][2][3][4][5][6][7][8][9] Recently, graphene-supported PMNC hybrids have displayed improved electrocatalytic activity and stability for many important electrochemical reactions (such as ethanol oxidation, 10,11 methanol oxidation, [11][12][13] oxygen reduction reaction, 8,[14][15][16][17] and ethylene glycol oxidation 18 ) compared to un-supported PMNCs or active carbon supported PMNCs, attributed to the outstanding physical and chemical properties of graphene, such as superior electrical conductivity (10 3 to 10 4 S m À1 ), large surface area (2630 m 2 g À1 ), excellent chemical stability, etc.).…”

Hydrogen co-reduction synthesis of PdPtNi alloy nanoparticles on carbon nanotubes as enhanced catalyst for formic acid electrooxidation

“…4D and F shows the high resolution spectra of Pt 4f regions in the PdPt/ MWCNT and PdPtNi/MWCNT catalysts. The Pt 4f spectra of both catalysts display the doublet signals consisting of a lowenergy band (Pt 4f 7/2 , 71.3 eV) and a high-energy band (Pt 4f 5/2 , 74.6 eV) [38,39]. Interestingly, the obvious shift (0.2 eV) of Pt peaks to lower binding energies can be also observed in the PdPtNi/MWCNT catalyst.…”