Topic
Platinum
About: Platinum is a research topic. Over the lifetime, 49675 publications have been published within this topic receiving 1150035 citations. The topic is also known as: Pt & element 78.
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212 citations
TL;DR: It was found that plantinum nanoparticle/multiwalled carbon nanotube hybrids could be well dispersed in water, which may find future applications in fields such as catalysis, nanoscale electronics, as well as sensors.
Abstract: Carboxylic acid- and amino-functionalized ionic liquids were used as the stabilizer for the systhesis of metal nanoparticles in aqueous solution. Smaller gold nanoparticles (3.5 nm) and platinum nanoparticles (2.5 nm) were prepared with NaBH4 as the reductant. Larger gold nanospheres (23, 42, and 98 nm) were synthesized using different quantities of trisodiumcitrate reductant. The morphology and the surface state of the metal nanoparticles were characterized by high-resolution transmission electron microscopy, UV−visible spectroscopy, and X-ray photoelectron spectroscopy. X-ray photoelectron spectroscopy spectra indicated that binding energies of C 1s and N 1s from ionic liquids on the surface of metal nanoparticles shifted negatively compared with that from pure ionic liquids. The mechanism of stabilization is proposed to be due to the interactions between imidazolium ions/functional groups in ionic liquids and metal atoms. Resonance Rayleigh scattering property of the functionalized ionic liquid-stabili...
212 citations
TL;DR: In this paper, carbon-supported Pt−Co electrocatalysts in the Pt:Co atomic ratio 85:15, mainly for application in polymer electrolyte fuel cells, have been prepared by different methods.
Abstract: Carbon-supported Pt−Co electrocatalysts in the Pt:Co atomic ratio 85:15, mainly for application in polymer electrolyte fuel cells, have been prepared by different methods. The materials were tested in single cells with respect to the oxygen reduction reaction and their performances were compared. Of the several methods considered, the preparation of the electrocatalyst via the deposition and reduction of a Co precursor on previously formed carbon-supported platinum gave the best results. By increasing the Co content, a decrease of metal particle size and an improvement in the activity for the ORR of these catalysts was observed. For the electrocatalysts with a Pt:Co atomic ratio of 75:25, a good stability upon cycling was also found.
212 citations
TL;DR: In this paper, the authors examined the dependence of optimum Nafion content in the catalyst layer on platinum loading and found that the best performance was obtained at different nafion loadings of 20, 40 and 50 ¼, respectively.
211 citations