通过球磨,CrNbO4的首次放/充电容量由212.9/100.9 mAh/g 提高到572.3/343.5 mAh/g,同时电流密度提高10倍,充放电50次后改性样品的放电容量仍可维持81.3 mAh/g,有效提高了电化学性能.%CrNbO4 was successively prepared by high solid-state method and first discussed its electrochemical properties as an anode ...
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电化学性能采用高温固相法制备CrNbO4,并首次研究其作为锂离子电池负极材料的电化学性能.使用 X射线衍射分析(XRD),扫描电子显微镜(SEM),充放电测试,循环伏安(CV)测试和电化学交流阻抗测试(EIS)对材料的结构,形貌和电化学性能进行表征.样品 CrNbO4在0.001~3.0 V 电压区间,电流密度为16 mA/g 时,充放电50次后放电...
Nanocrystalline chromium niobate (CrNbO4) was synthesized by a low temperature niobium-citrate complex process. Thermal analysis (TG/DTA), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) with energy dispersive X-ray spectroscopy (EDX), ...
The determined band gap energies of CrNbO4 and CrTaO4 are 2.39 eV and 2.82 eV, respectively, which prompted us to investigate photocatalytic activity of these oxides in degradation of dyes. Microscopy studies show that the particles of both oxides began to aggregate into bigger particles, ...
Reduction of CrNbO4 under 5% H2/Ar at different temperatures has been carried out to obtain oxygen-deficient rutiles aiming for mixed ionic and electronic conductivities. Decomposition is observed at temperatures above 950 °C. Hence, the more reduced rutile that could be obtained corresponds to...
The character of the ordering (one-dimensional in CrNbO4, supposedly approaching the AlWO4 type, and two-dimensional in LiFeO2 with a symmetry decreased to tetragonal and approaching the CuAu type) depends on the anisotropy of cation distribution in the cation coordination spheres. Microdomains ...
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CrNbO4 that crystallizes in a rutile structure is known as an antiferromagnetic oxide exhibiting a spin glass transition due to the structural disorder. The present study compares the magnetic properties of CrNbO4 synthesized by two different methods: high-temperature solid state reaction and sol-...