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

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

Nanoscale (2014-11-05)

Rui-Xiang Wang, Jing-Jing Fan, You-Jun Fan, Jing-Ping Zhong, Li Wang, Shi-Gang Sun, Xing-Can Shen

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.

MATERIALS

Product Number

Brand

Product Description

Sigma-Aldrich

Methanol, purification grade, 99.8%

Sigma-Aldrich

Methanol, suitable for HPLC, gradient grade, ≥99.9%

Sigma-Aldrich

Methanol, ACS reagent, ≥99.8%

Supelco

Methanol, Pharmaceutical Secondary Standard; Certified Reference Material

Sigma-Aldrich

Methanol, suitable for HPLC, ≥99.9%

Sigma-Aldrich

Methanol, HPLC Plus, ≥99.9%

Sigma-Aldrich

Methanol, NMR reference standard

Sigma-Aldrich

Methanol, BioReagent, ≥99.93%

Sigma-Aldrich

Methanol, ACS reagent, ≥99.8%

Sigma-Aldrich

Methanol, ACS reagent, ≥99.8%

Sigma-Aldrich

Methanol, ACS spectrophotometric grade, ≥99.9%

Sigma-Aldrich

Methanol, Laboratory Reagent, ≥99.6%

Sigma-Aldrich

Methanol, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99.8% (GC)

Sigma-Aldrich

Methanol, puriss., meets analytical specification of Ph Eur, ≥99.7% (GC)

Sigma-Aldrich

Methanol, anhydrous, 99.8%

Supelco

Methanol, analytical standard

Sigma-Aldrich

Sulfuric acid, ACS reagent, 95.0-98.0%

Sigma-Aldrich

Sulfuric acid, puriss. p.a., for determination of Hg, ACS reagent, reag. ISO, reag. Ph. Eur., 95.0-97.0%

Sigma-Aldrich

Chloroplatinic acid hexahydrate, powder and chunks

Sigma-Aldrich

Sulfuric acid, puriss., meets analytical specification of Ph. Eur., BP, 95-97%

Sigma-Aldrich

Chloroplatinic acid hexahydrate, ACS reagent, ≥37.50% Pt basis

Sigma-Aldrich

Chloroplatinic acid hexahydrate, BioXtra

Sigma-Aldrich

Methanol, suitable for HPLC, gradient grade, suitable as ACS-grade LC reagent, ≥99.9%

Sigma-Aldrich

Sulfuric acid, 99.999%

Supelco

Sulfuric acid concentrate, 0.1 M H₂SO₄ in water (0.2N), eluent concentrate for IC

USP

Methyl alcohol, United States Pharmacopeia (USP) Reference Standard

Sigma-Aldrich

Methanol solution, NMR reference standard, 4% in methanol-d₄ (99.8 atom % D), NMR tube size 3 mm × 8 in.

Sigma-Aldrich

Methanol solution, (Methanol:Dimethyl sulfoxide 1:1 (v/v))

Sigma-Aldrich

Methanol-¹²C, 99.95 atom % ¹²C

Sigma-Aldrich

Methanol solution, contains 0.50 % (v/v) triethylamine