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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
TL;DR: In this article, the kinetic laws which govern the oxidation process of ethanol on smooth platinum electrodes in acid medium, electrolyses of ethanol were carried out under different experimental conditions and the influence of the initial ethanol concentration and of the potential plateau of electrolysis were investigated and allowed them to improve their understanding of the reaction mechanism.

249 citations

Journal ArticleDOI
TL;DR: In this article, the de-alloying of Cu075Pt025 alloy in 1 M H2SO4 was performed using field emission scanning electron microscopy and small angle neutron scattering.
Abstract: This paper gives results demonstrating the production of nanoporous platinum through the de-alloying of Cu075Pt025 alloy in 1 M H2SO4 Both field emission scanning electron microscopy and small angle neutron scattering confirm the presence of porosity with a diameter of approximately 34 nm This is the smallest porosity quantitatively reported from a de-alloying process to date The small size is attributed to the extremely small values of surface diffusivity expected for Pt at room temperature, effectively eliminating room-temperature coarsening processes The results also show that larger length scales can be achieved through coarsening at elevated temperatures The ease of production of porous platinum makes it attractive for possible applications, such as high surface area electrodes for biomedical devices or as catalyst materials

248 citations

Journal ArticleDOI
TL;DR: The carboxylation reaction can be used to prepare molecules containing ligands with pendant functional groups that would be difficult to introduce by substitution reactions, such as Pt(1V) dicarbonates and dicarbamates.
Abstract: Carboxylation of hydroxide coordinated to Pt(1V) by anhydrides, pyrocarbonates, and isocyanates to form the corresponding Pt(1V) carboxylates, carbonates, and carbamates is described. For example, the acylation with acetic anhydride of (OC-6-33)-amminedichloro(cyclohexanamine)dihydroxyplatinum(IV) leads to formation of (OC-6-43)-bis(acetato-O)amminedichloro(cyclohexanamine)platinum(IV) (JM-216) in 60% yield. This compound is currently in worldwide clinical trials as an orally active antitumor agent. Pt(1V) dicarbonates and dicarbamates are prepared similarly by reaction of a Pt(1V) hydroxide with a pyrocarbonate or isocyanate. The carboxylation reaction can be used to prepare molecules containing ligands with pendant functional groups that would be difficult to introduce by substitution reactions. Thus (OC-6-43)-amminedic~oro(cyclohexanamine)bis((methylthio)acetatoO)platinum(IV) was prepared, which was oxidized to the corresponding sulfoxide (OC-6-43)-amminedichloro(cyclohexanamine)bis( methylsulfiiy1)acetato-O)platinum(IV). Finally, unsymmetrical carboxylate complexes may be obtained by reaction of a binary mixture of two electrophiles with a Pt(IV) hydroxide followed by chromatographic separation of the carboxylation products. A simplified synthesis of the K[PtnC13NH3] in 55% yield from cisplatin is also reported. This improves tHe availability of molecules of the general formula cis-PtnC12AA’ (A, A’ = ammine, amine) which are critical intermediates in the multistep synthesis of the Pt(IV) carboxylates having antitumor activity.

248 citations

Journal ArticleDOI
TL;DR: Active non-metal catalysts for the Oxygen Reduction Reaction (ORR) were prepared by decomposition of acetonitrile vapor at 900°C over a pure alumina support, and supports containing 2 wt% Fe or 2wt% Ni on alumina as mentioned in this paper.
Abstract: Active non-metal catalysts for the Oxygen Reduction Reaction (ORR) were prepared by decomposition of acetonitrile vapor at 900°C over a pure alumina support, and supports containing 2 wt% Fe or 2 wt% Ni on alumina. The exposed alumina and metal in the samples were subsequently washed away with HF acid to purify the solid carbon material. The sample prepared with iron was the most active sample for the ORR, with only 100 mV greater overpotential than a commercial 20 wt% Pt / Vulcan Carbon catalyst. However, nitrogen-containing carbon deposited on pure alumina (which contained less than 1 ppm metal contamination) was also quite active, demonstrating that platinum or iron is not required for ORR activity. Characterization by XPS and TEM revealed that the more active samples had nanostructured carbon with more edge plane exposure than the less active tube structures formed from the nickel sample.

248 citations

Journal ArticleDOI
TL;DR: Activating platinum with light: An inert platinum(IV) diazido complex trans, trans,trans-[Pt(N3) 2(OH)2(py)2)2] becomes potently cytotoxic to cancer cells when activated by low doses of visible light.
Abstract: Activating platinum with light: An inert platinum(IV) diazido complex trans, trans,trans-[Pt(N3)2(OH)2(py)2] becomes potently cytotoxic to cancer cells when activated by low doses of visible light.

248 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