【摘 要】
：
Size and morphology are critical factors in determining the electrochemical performance of the supercapacitor ma-terials,due to the manifestation of the nanosize effect.Herein,different nanostructures of the CrN material are prepared by the combination of
【机 构】
：
Joint Laboratory for Extreme Conditions Matter Properties,Southwest University of Science and Techno
论文部分内容阅读
Size and morphology are critical factors in determining the electrochemical performance of the supercapacitor ma-terials,due to the manifestation of the nanosize effect.Herein,different nanostructures of the CrN material are prepared by the combination of a thermal-nitridation process and a template technique.High-temperature nitridation could not only transform the hexagonal Cr2O3 into cubic CrN,but also keep the template morphology barely unchanged.The ob-tained CrN nanostructures,including (i) hierarchical microspheres assembled by nanoparticles,(ii) microlayers,and (iii)nanoparticles,are studied for the electrochemical supercapacitor.The CrN microspheres show the best specific capaci-tance (213.2 F/g),cyclic stability (capacitance retention rate of 96％ after 5000 cycles in 1-mol/L KOH solution),high energy density (28.9 Wh/kg),and power density (443.4 W/kg),comparing with the other two nanostructures.Based on the impedance spectroscopy and nitrogen adsorption analysis,it is revealed that the enhancement arised mainly from a high-conductance and specific surface area of CrN microspheres.This work presents a general strategy of fabricating controllable CrN nanostructures to achieve the enhanced supercapacitor performance.
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