排序方式: 共有33条查询结果,搜索用时 17 毫秒
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Yu Zhang Weimeng Chi Baiqing Zhang Zhuoxun Yin Xinzhi Ma Yang Zhou Wei Chen Lingling Xu Jinlong Li 《欧洲无机化学杂志》2023,26(34):e202300492
The conventional electrolytic water-splitting process for hydrogen production is plagued by high energy consumption, low efficiency, and the requirement of expensive catalysts. Therefore, finding effective, affordable, and stable catalysts to drive this reaction is urgently needed. We report a nanosheet catalyst composed of carbon nanotubes encapsulated with MoC/Mo2C, the Ni@MoC-700 nanosheet showcases low overpotentials of 275 mV for the oxygen evolution reaction and 173 mV for the hydrogen evolution reaction at a current density of 10 mA ⋅ cm−2. Particularly noteworthy is its outstanding performance in a two-electrode system, where a cell potential of merely 1.64 V is sufficient to achieve the desired current density of 10 mA ⋅ cm−2. Furthermore, the catalyst demonstrates exceptional durability, maintaining its activity over a continuous operation of 40 hours with only minimal attenuation in overpotential. These outstanding activity levels and long-term stability unequivocally highlight the promising potential of the Ni@MoC-700 catalyst for large-scale water-splitting applications. 相似文献
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Here we report a metal induced nucleation to realize the growth of ReS2 flowers at controlled locations. The ordered arrays of ReS2 flowers have been successfully prepared on SiO2/Si substrate using Pt metal dots as nucleation sites and S, NH4ReO4 powders as precursors by a chemical vapor depostion method. The NH4ReO4 powders are used as the rhenium sources. The ReS2 flowers are grown above the pre-patterned Pt dots, Raman and transmission electron microscopy measurements indicated that the prepared ReS2 flowers have excellent crystalline quality. 相似文献
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《Polyhedron》2005,24(16-17):2269-2273
Two ion-pair compounds, consisting of 1-(4′-R-benzyl)pyridinium ([RBzPy]+, R = NO2 (1) and Br (2)) and [Ni(dmit)2]− (dmit2− = 2-thioxo-1,3-dithion-4,5-dithiolato), have been synthesized and structurally characterized. The anions of [Ni(dmit)2]− stack into dimers, which further construct into two-leg ladder through terminal S⋯S interactions in 1, lateral S⋯S interactions in 2. The weak H-bonding interactions of C–H⋯S were observed in 2, while only weak van de Waals interactions between anion and cations in 1. The magnetic susceptibilities measured in 2–300 K indicate AFM exchange interaction domination both two compounds. A peculiar magnetic transition at ∼100 K was observed in 1. An AFM ordering below ∼11 K was found in 2, and the best fit to magnetic susceptibility above 45 K in this compound, using a dimer model with s = 1/2, give rise to Δ/kB = 36.1 K, zJ = −0.91 K, C = 3.2 × 10−3 emu K mol−1 and χ0 = −4.0 × 10−6 emu mol−1 with g of 2.0 fixed. 相似文献
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合成了6种钨硅杂多配合物异构体α、βi-M3H2[SiW11(NbO2)O39]·H2O(M=Me4N+(TMA),Bu4N+(TBA),Et4N+(TEA);βi=β1,β2,β3)。IR光谱、UV光谱、极谱、I--S2O32-滴定证明合成的杂多配合物中有NbO2基存在, 183W NMR光谱证明其阴离子具有Keggin结构,催化实验结果表明,合成的化合物对烯烃环氧化反应具有催化活性,且过氧杂多配合物的催化活性高于非过氧杂多配合物,β异构体的催化活性高于α。 相似文献
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《Particuology》2015
Nanostructured transition metal oxides are promising alternative anodes for lithium ion batteries. Li-ion storage performance is expected to improve if high packing density energy particles are available. Herein, Mn2O3 microspheres with a ca. 18 μm diameter and a tapped density of 1.33 g/cm3 were synthesized by a facile solvothermal–thermal coversion route. Spherical MnCO3 precursors were obtained through solvothermal treatment and they decomposed and converted into Mn2O3 microspheres at an annealing temperature of 700 °C. The Mn2O3 microspheres consisted of Mn2O3 nanoparticles with an average 40 nm diameter. These porous Mn2O3 microspheres allow good electrolyte penetration and provide an ion buffer reservoir to ensure a constant electrolyte supply. The Mn2O3 microspheres have reversible capacities of 590 and 320 mAh/g at 50 and 400 mA/g, respectively. We thus report an efficient route for the fabrication of energy particles for advanced energy storage. 相似文献
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Rhodium/Silver‐Cocatalyzed Transannulation of N‐Sulfonyl‐1,2,3‐triazoles with Vinyl Azides: Divergent Synthesis of Pyrroles and 2 H‐Pyrazines 下载免费PDF全文
The first cyclization reaction between vinyl azides and N‐sulfonyl‐1,2,3‐triazoles is reported. A Rh/Ag binary metal catalyst system proved to be necessary for the successful cyclization. By varying the structure of vinyl azides, such reaction allows the divergent synthesis of pyrroles and 2H‐pyrazines. The cyclization reactions feature a broad substrate scope, good functional group tolerance, high reaction efficiency, and good to high product yields. 相似文献
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设定了Visual minteq软件F~--Al~(3+)体系的物种及平衡常数。模拟滴定和实验滴定结果的相似性证明了软件设定的合理。对F-(0.01/0.1 mol/L)-Al~(3+)(0.02 mol/L)-OH-体系的模拟和分析表明,当F与Al摩尔比相差大时,体系平衡物种分布不同,OH-掩蔽铝的机理也不同,但是在p H值11~12铝都被成功掩蔽;不同的反应机理导致F与Al摩尔比大的体系模拟和滴定曲线差别较大。进一步模拟得到了此p H值区间的最大可掩蔽铝浓度。考虑OH-对氟离子电极的影响,最终确定高氟(0.01~0.1 mol/L)高铝体系氟的测定条件:控制p H值为(11.5±0.2),不大于0.02 mol/L的铝。误差分析表明,当电势测定误差较大时,标准曲线法比标准加入法误差小。 相似文献
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《Comptes Rendus de l''Academie des Sciences Series IV Physics》2001,2(4):671-680
The coherent manipulation of Bose–Einstein condensates by far blue detuned optical dipole potentials is discussed in two regimes. The local manipulation of the phase of the condensate wavefunction by temporally applied dipole potentials represents a powerful tool for the design of matter waves. We use this method in particular for the creation of dark solitons in Bose–Einstein condensates and study their dynamics. Spatially inhomogeneous dipole potentials like far blue detuned doughnut laser beams can be used for the creation of Bose–Einstein condensates within a waveguide structure. 相似文献