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: The highly structured emission spectra, long life times, and DFT calculations suggested that the emissive state is primarily a (3)LC state with metal-to-ligand charge-transfer (MLCT) admixture.
Abstract: N,N-Di(6-phenylpyridin-2-yl)aniline (L1), N,N-di(6-(2,4-difluorophenyl)pyridin-2-yl)aniline (L2), N,N-di(3-(pyridin-2-yl)phenyl)aniline (L3), N,N-di(3-(1H-pyrazol-1-yl)phenyl)aniline (L4), N,N-di(3-(3-methyl-1H-pyrazol-1-yl)phenyl)aniline (L5), and N,N-di(3-(4-methyl-1H-pyrazol-1-yl)phenyl)aniline (L6) undergo cyclometalation to produce two types of tetradentate bis-cyclometalated platinum(II) complexes: C∧N*N∧C platinum complexes 1 and 2 and N∧C*C∧N platinum complexes 3−6, respectively, where an “X∧Y” (X, Y = C or N) denotes a bidentate coordination to the platinum to form a five-membered metallacycle and “X*Y” denotes a coordination to form a six-membered metallacycle. The crystal structures of 1, 3, and 5 were determined by the single-crystal X-ray diffraction analysis, showing distorted square-planar geometry, that is, two C∧N coordination moieties are twisted. Complex 5 showed much greater distortion with largest deviation of 0.193 A from the mean NCCNPt coordination plane, which is attributed to the...
236 citations
TL;DR: In this paper, the first cubic platinum nanoparticles (4−18 nm) were synthesized in solution by the controlled reduction of K2PtCl4 with hydrogen gas in the presence of sodium polyacrylate as a capping material.
Abstract: Cubic platinum nanoparticles (4−18 nm) have been synthesized for the first time in solution by the controlled reduction of K2PtCl4 with hydrogen gas in the presence of sodium polyacrylate as a capping material. The nanoparticles are found to have fcc structures, similar to the bulk metal with {100} facets.
236 citations
TL;DR: In this article, a porous palladium nanoparticle-carbon nitride composite (Pd-CNx) was developed for hydrogen evolution in aqueous medium with a small onset potential of −12 mV and a Tafel slope of 35 mV dec−1.
Abstract: The hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR) in aqueous medium are two fundamental reactions for the development of non-fossil energy storage and conversion devices. In the polymer electrolyte membrane fuel cell (PEMFC) carbon supported platinum (Pt/C) based catalysts are universally used in cathodes and anodes; however, the poor durability of Pt/C due to degradation of the catalyst in the strongly oxidizing environment prevents its widespread applications. It remains a great challenge to develop new electrocatalysts with superior activity and very high durability for the HER/HOR. Here, we report the synthesis of a porous palladium nanoparticle–carbon nitride composite (Pd-CNx) for its superior activity and high durability toward the HER/HOR in acidic and alkaline media. The Pd-CNx composites exhibited high catalytic activity for hydrogen evolution in acidic media with a small onset potential of −12 mV and a Tafel slope of 35 mV dec–1. At a small Pd loading of 0.043 mg cm–2,...
236 citations
235 citations
TL;DR: In this article, the authors investigated the effect of CO adsorption on Pt catalysts at CO contents of 10-100 ppm in H2 gas and electrocatalytic oxidation of H2 at Pt electrodes covered with CO.
235 citations