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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TL;DR: In this paper, the reaction of neopentane on supported platinum and platinum powder catalysts has been obtained at 300 °C, 1 atm total pressure, and a hydrogen-to-neopentanes ratio of 10.
180 citations
TL;DR: The photoluminescent properties of mono-and polynuclear cyclometalated platinum(II) complexes are discussed in this article, where the structure-emission relationships observed in these platinum-II complexes are described and comparisons with palladium-II analogues regarding the structural properties are highlighted.
Abstract: The photoluminescent properties of mono- and polynuclear cyclometalated platinum(II) complexes are discussed. Spectroscopic studies have revealed weak intra- or intermolecular metal-metal and ligand-ligand interactions that are affected by the molecular structure and microenvironment. The structure-emission relationships observed in these platinum(II) complexes are described and comparisons with palladium(II) analogues regarding the structural and photoluminescent properties are highlighted. With judicious modification of cyclometalated and/or ancillary ligands, robust platinum luminophores with tunable emission energies and lifetimes have been synthesized. These complexes can be employed as luminescent sensors and electrophosphorescent materials in organic light-emitting devices (OLED).
180 citations
TL;DR: In this article, a vapor-feed direct methanol fuel cell based on a Nafion 117 solid polymer electrolyte was investigated, and the structure, surface, and morphology of the catalysts were investigated by X-ray powder diffraction, Xray photoelectron spectroscopy, and transmission electron microscopy.
Abstract: A vapor-feed direct methanol fuel cell based on a Nafion 117{reg_sign} solid polymer electrolyte was investigated. Pt-Ru/C and Pt/C catalysts were employed for methanol oxidation and oxygen reduction, respectively. The structure, surface, and morphology of the catalysts were investigated by X-ray powder diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. Crystalline face-centered cubic phases were found in the Pt and Pt-Ru catalysts. The alloy composition in the Pt-Ru/C catalyst was different from the nominal composition, probably due to the formation of surface RuO{sub x} species, as indicated by X-ray photoelectron spectroscopy. Transmission electron microscopy observation showed an increase of the average particle size and particle agglomeration in the Pt-Ru/C catalyst compared to the Pt/C catalyst. The membrane/electrode assembly was prepared by using a paste process method. Scanning electron microscopy and energy dispersive X-ray analyses showed good adhesion of catalyst layers to the membrane and a homogeneous distribution of the ionomer inside the catalyst. AC-impedance and galvanostatic steady-state polarization techniques were used to investigate the electrochemical performance of the direct methanol fuel cell.
179 citations
TL;DR: It is reported that a dealloying process can be utilized to experimentally fabricate the interface between de alloyed platinum–nickel alloy and amorphous nickel boride membrane, and this composite catalyst achieves a 27-times enhancement in mass activity relative to commercial platinum/carbon.
Abstract: Low activity of the oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells is a barrier for commercial applications. Here the authors report a nickel boride membrane-coated Pt-Ni catalyst, achieving 27-fold enhancement in mass activity for ORR relative to commercial Pt/C.
179 citations
TL;DR: Tungsten carbide has been shown to be an effective catalyst for a number of reactions that are readily catalyzed by platinum, but not at all by tungsten, and it was speculated that this behavior is due to changes in the electron distribution when carbon is added to tsungsten.
Abstract: Tungsten carbide has been shown to be an effective catalyst for a number of reactions that are readily catalyzed by platinum, but not at all by tungsten, and it was speculated that this behavior is due to changes in the electron distribution when carbon is added to tungsten. A test of this hypothesis, made by measuring the valence band x-ray photoelectron spectrum of tungsten carbide and comparing it with the spectra of tungsten and platinum, shows that, near the Fermi level, the electronic density of states of tungsten carbide more nearly resembles that of platinum than that of tungsten.
179 citations