Electrocatalyst on insulating support?: Hollow silica spheres loaded with Pt nanoparticles for methanol oxidation

ACS Applied Materials & Interfaces
Ambrose A MelvinSantosh K Haram

Abstract

Electrocatalytic oxidation of methanol on silica hollow spheres, loaded with platinum nanoparticles (Pt-SiO2-HS), is reported. The functionalized hollow silica spheres were prepared by the surfactant (lauryl ester of tyrosine) template-assisted synthesis. These spheres were loaded with platinum nanoparticles by γ-radiolysis. Energy-dispersive X-ray analysis (EDAX) and X-ray photoelectron spectroscopy (XPS) analyses confirmed presence of Si and Pt in the composite. High-resolution transmission electron microscopy showed the formation of uniformly deposited Pt nanoparticles over the hollow spheres with a predominant Pt(111) lattice plane on the surface. In spite of the poor conducting nature of the silica support, the oxidation potential and current density per unit mass for methanol oxidation were noted to be ca. 0.72 V vs NHE and 270 mA mg(-1), respectively, which are among the best values reported in its class. The composite did not show any sign of a degradation even after repeated use. In fact, the anodic current was found to increase under constant polarization, which is attributed to a facile reaction between adsorbed CO with a surface hydroxyl group present on the silica support. These results are in favor of Pt-SiO2-HS a...Continue Reading

References

Oct 7, 2004·Chemical Communications : Chem Comm·Changwei Xu, Pei Kang Shen
Jan 27, 2005·Chemical Reviews·Martin Winter, Ralph J Brodd
Dec 26, 2006·Journal of Colloid and Interface Science·B LiuY F Kuang
Mar 17, 2010·Journal of Colloid and Interface Science·Ambrose MelvinDeepa Khushalani
May 22, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Zhenyu SunLanqun Mao
Aug 26, 2010·ACS Applied Materials & Interfaces·Jitendra N TiwariKun-Lin Lin
Feb 22, 2011·Chemical Communications : Chem Comm·Hamed Ataee-EsfahaniYusuke Yamauchi
Aug 18, 2012·Journal of the American Chemical Society·Bao Yu XiaXiong Wen Lou

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