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Martin Heise Bertold Rasche Dr. Anna Isaeva Dr. Alexey I. Baranov Prof. Dr. Michael Ruck Konrad Schäfer Prof. Dr. Rainer Pöttgen Jens‐Peter Eufinger Prof. Dr. Jürgen Janek 《Angewandte Chemie (International ed. in English)》2014,53(28):7344-7348
Nanoparticles of Bi3Ir, obtained from a microwave‐assisted polyol process, activate molecular oxygen from air at room temperature and reversibly intercalate it as oxide ions. The closely related structures of Bi3Ir and Bi3IrOx (x≤2) were investigated by X‐ray diffraction, electron microscopy, and quantum‐chemical modeling. In the topochemically formed metallic suboxide, the intermetallic building units are fully preserved. Time‐ and temperature‐dependent monitoring of the oxygen uptake in an oxygen‐filled chamber shows that the activation energy for oxide diffusion (84 meV) is one order of magnitude smaller than that in any known material. Bi3IrOx is the first metallic oxide ion conductor and also the first that operates at room temperature. 相似文献
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Sheng Yang Guangbo Chen Antonio Gaetano Ricciardulli Panpan Zhang Zhen Zhang Huanhuan Shi Ji Ma Jian Zhang Paul W. M. Blom Xinliang Feng 《Angewandte Chemie (International ed. in English)》2020,59(1):465-470
Transition‐metal phosphides (TMPs) have emerged as a fascinating class of narrow‐gap semiconductors and electrocatalysts. However, they are intrinsic nonlayered materials that cannot be delaminated into two‐dimensional (2D) sheets. Here, we demonstrate a general bottom‐up topochemical strategy to synthesize a series of 2D TMPs (e.g. Co2P, Ni12P5, and CoxFe2?xP) by using phosphorene sheets as the phosphorus precursors and 2D templates. Notably, 2D Co2P is a p‐type semiconductor, with a hole mobility of 20.8 cm2 V?1 s?1 at 300 K in field‐effect transistors. It also behaves as a promising electrocatalyst for the oxygen evolution reaction (OER), thanks to the charge‐transport modulation and improved surface exposure. In particular, iron‐doped Co2P (i.e. Co1.5Fe0.5P) delivers a low overpotential of only 278 mV at a current density of 10 mA cm?2 that outperforms the commercial Ir/C benchmark (304 mV). 相似文献
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T. N. Galkova B. Pacewska V. V. Samuskevich J. Pysiak N. V. Shulga 《Journal of Thermal Analysis and Calorimetry》2000,60(3):1019-1032
The isothermal and non-isothermal transformations of polycrystalline CuNH4PO4⋅H2O in vacuum and in various gas atmospheres (in open air and in gaseous ammonia atmosphere) were studied at 20–800°C by means
of differential thermal analysis, thermogravimetry, X-ray diffraction, paper chromatography, optical microscopy and chemical
analyses. The effects of the gas phase composition on the kinetic peculiarities of total gas evolution and on the partial
processes of dehydration, ammonia removal and rearrangement of the anionic sub-lattice were considered.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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Pau Moneva Lorente Dr. Céline Besnard Prof. Alan F. Williams 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(24):8851-8858
Assembly of two ditopic units, a phenanthroline substituted by 4‐ethynyl pyridines at the 2‐and 9‐positions and a dimetallic paddlewheel, gives a linear chain polymer rather than a closed cyclic species, which would appear equally possible. The chain may be decorated by binding a copper‐containing macrocycle around the phenanthroline units to form a polypseudorotaxane. When two phenanthroline ligands are assembled in a first step around copper(I), the paddlewheel acceptor can link them in a second step to form a two‐dimensional interwoven grid that resembles the form of a chain‐link fence. Each copper(I) centre in this structure is chiral, and the crystal shows complete homochirality, implying selection during the assembly process. 相似文献
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