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 article, the interaction of methanol with clean and oxygen-covered Pt(111) surfaces has been examined with high resolution electron loss spectroscopy (EELS) and thermal desorption spectrography (TDS).
296 citations
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TL;DR: In this paper, the long-term dissolution behavior of polycrystalline platinum and high-surface-area carbon-supported platinum particles was studied under potentiostatic conditions relevant to PEFC cathode conditions.
Abstract: One of the processes responsible for performance degradation of a polymer electrolyte fuel cell (PEFC) is the loss of the electrochemically active surface area of the platinum-based electrocatalysts, due in part to platinum dissolution. The long-term dissolution behavior of polycrystalline platinum and high-surface-area carbon-supported platinum particles was studied under potentiostatic conditions relevant to PEFC cathode conditions. The equilibrium concentration of dissolved Pt was found to increase monotonically from 0.65 to 1.1 V (vs SHE) and decrease at potentials >1.1 V. Dissolution rates measured at 0.9 V were comparable for the two types of electrodes (1.4 and 1.7 × 10 -14 g/cm 2 s).
296 citations
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18 Jan 1989TL;DR: In this paper, an autothermal reformer for methanol synthesis is proposed. But the authors focus on a relatively simple and compact reactor within which a wide variety of hydrocarbonaceous feeds, from heavy hydrocarbon feedstocks to natural gas, may be utilized for producing methanoline synthesis gas.
Abstract: A process for methanol production includes preparing a hydrogen containing synthesis gas by autothermally reforming a hydrocarbonaceous feed, such as a hydrocarbon feed, with oxygen and steam in an autothermal reformer utilizing a first, monolithic catalyst having a palladium and platinum containing catalyst therein, and a second, platinum group metal steam reforming catalyst. The autothermal reformer provides a relatively simple and compact reactor within which a wide variety of hydrocarbonaceous feeds, from heavy hydrocarbon feedstocks to natural gas, may be utilized for producing methanol synthesis gas, which is advantageously carried out at an elevated pressure. By controlling H 2 O to carbon and O 2 to carbon feed ratios, a given feed can be autothermally reformed to yield a synthesis gas of desired ratio of 1 H 2 to (2CO+3CO 2 ) for methanol production.
296 citations
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TL;DR: In this article, the authors measured the lattice contraction as a function of temperature and size of the gold and platinum rings at different temperatures and derived the surface stress coefficient and thermal expansion coefficient.
294 citations
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TL;DR: A graphite-like carbon film electrode containing 6.5% platinum (Pt) nanoparticles was developed for use as a detector in microbore liquid chromatography (LC) with a postcolumn enzyme reactor and showed excellent electrocatalytic activity, high sensitivity, and negligible baseline drift when detecting hydrogen peroxide.
Abstract: A method for the highly sensitive determination of acetylcholine (ACh) and choline (Ch) that employs a graphite-like carbon film electrode containing 6.5% platinum (Pt) nanoparticles was developed for use as a detector in microbore liquid chromatography (LC) with a postcolumn enzyme reactor. The film electrode was prepared by RF cosputtering carbon and Pt, which requires only a one-step formation process. This method can control the Pt content of the film at a relatively low deposition temperature (below 200 degrees C). The average size of the Pt nanoparticles was 2.5 nm. The film electrode showed excellent electrocatalytic activity, high sensitivity, and negligible baseline drift when detecting hydrogen peroxide. The electrode was modified with glucose oxidase and responded rapidly to glucose with a much more stable baseline current than at a Pt bulk electrode based sensor. Therefore, it is appropriate to employ the electrode to detect trace amounts of biomolecules, such as neurotransmitters and hormones combined with various oxidase enzymes. We used the electrode as a detector for microbore LC and observed a low detection limit of 2.5 and 2.3 fmol (10-microL injection) for ACh and Ch, respectively, which is approximately 1 order of magnitude lower than that of a Pt bulk electrode.
294 citations