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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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Journal ArticleDOI
01 Oct 1979-Nature
TL;DR: In this article, the first observations of the dynamics of intervention of the Pt particles in the redox events are presented, and a centrifuged colloidal Pt catalyst stabilised by polyvinyl alcohol showed exceptionally high activity in promoting hydrogen evolution from water via 2MV+ + H2O→PtH2 + 2OH− + 2 MV2+ where MV+ stands for reduced methylviologen.
Abstract: Noble metal dispersions are suitable for mediating light-induced hydrogen1–5 and oxygen6–8 evolution from water. We report here a dramatic improvement of the hydrogen production rate when very finely dispersed platinum is used as a mediator in reaction (1). The first observations of the dynamics of intervention of the Pt particles in the redox events are presented. A centrifuged colloidal Pt catalyst stabilised by polyvinyl alcohol showed exceptionally high activity in promoting hydrogen evolution from water via 2MV+ + H2O→PtH2 + 2OH− + 2MV2+ (1) where MV+ stands for reduced methylviologen. The latter is produced photochemically in aqueous solution containing Ru(bipy)32+ as a sensitiser and EDTA as an electron donor. At 10−3 M Pt the reoxidation of MV+ requires only 15 µs and leads to quantitative formation of H2.

228 citations

Journal ArticleDOI
TL;DR: The role of strongly adsorbed hydrocarbon deposits in reforming catalysis on a series of flat, stepped, and kinked platinum single-crystal surfaces at atmospheric pressures and temperatures between 300 and 700 K has been established and a model developed for the working structure and composition of the active catalyst surface as discussed by the authors.

228 citations

Journal ArticleDOI
TL;DR: The demonstration of a single cell that maintains an inverse opal structure entirely within a membrane electrode assembly has been reported, which maintains an effective porosity, an enhanced performance, as well as an improved mass transfer and more effective water management, owing to its morphological advantages.
Abstract: Inverse opal structures are desirable for fuel cell electrodes, but application of such structures in polymer electrolyte membrane fuel cells is yet to be realised. Kim et al. report fabrication of a platinum catalyst layer with an inverse opal structure, and show improved fuel cell performance.

228 citations

Journal ArticleDOI
TL;DR: In this paper, a wide range of magnetic iron-doped molybdenum carbide (Mo2-xFexC) nanomaterials were synthesized by a unique amine-metal oxide composite method.
Abstract: Molybdenum-based materials have been widely investigated recently as promising alternatives to platinum for catalyzing the hydrogen evolution reaction (HER). Molybdenum carbide is one of the most studied transition-metal carbides because of its cheap price, high abundance, good conductivity, and catalytic activity. In order to further improve the catalytic activity of molybdenum carbide, some modifications have been applied. In this paper, a wide range of magnetic iron-doped molybdenum carbide (Mo2–xFexC) nanomaterials were synthesized by a unique amine–metal oxide composite method. The amount of iron dopants was controlled by setting different iron/molybdenum ratios in the precursors. Iron-doped molybdenum carbide nanomaterials were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive spectroscopy, Raman microscopy, and X-ray photoelectron spectroscopy. Electrocatalytic HER tests were used to demonstrate the catalytic activity upon addition ...

228 citations

Journal ArticleDOI
TL;DR: Nanosized platinum particles dispersed on platelet-type CNF efficiently catalyze the reduction of functionalized nitroarenes to the corresponding substituted anilines in high turnover numbers with other functional groups remaining intact.

228 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,041
20221,789
2021867
20201,180
20191,408
20181,449