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首页> 美国卫生研究院文献>Nanomaterials >Nitridation Temperature Effect on Carbon Vanadium Oxynitrides for a Symmetric Supercapacitor
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Nitridation Temperature Effect on Carbon Vanadium Oxynitrides for a Symmetric Supercapacitor

机译：对称超级电容器上氮化温度对碳钒氧氮化物的影响

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In this work, porous carbon-vanadium oxynitride (C-V NO) nanostructures were obtained at different nitridation temperature of 700, 800 and 900 °C using a thermal decomposition process. The X-ray diffraction (XRD) pattern of all the nanomaterials showed a C-V NO single-phase cubic structure. The C-V NO obtained at 700 °C had a low surface area (91.6 m g ), a moderate degree of graphitization, and a broader pore size distribution. The C-V NO obtained at 800 °C displayed an interconnected network with higher surface area (121.6 m g ) and a narrower pore size distribution. In contrast, at 900 °C, the C-V NO displayed a disintegrated network and a decrease in the surface area (113 m g ). All the synthesized C-V NO yielded mesoporous oxynitride nanostructures which were evaluated in three-electrode configuration using 6 M KOH aqueous electrolyte as a function of temperature. The C-V NO@800 °C electrode gave the highest electrochemical performance as compared to its counterparts due to its superior properties. These results indicate that the nitridation temperature not only influences the morphology, structure and surface area of the C-V NO but also their electrochemical performance. Additionally, a symmetric device fabricated from the C-V NO@800 °C displayed specific energy and power of 38 W h kg and 764 W kg , respectively, at 1 A g in a wide operating voltage of 1.8 V. In terms of stability, it achieved 84.7% as capacity retention up to 10,000 cycles which was confirmed through the floating/aging measurement for up to 100 h at 10 A g . This symmetric capacitor is promising for practical applications due to the rapid and easy preparation of the carbon-vanadium oxynitride materials.
机译：在这项工作中，使用热分解工艺在700、800和900°C的不同氮化温度下获得了多孔碳钒氧氮（C-V NO）纳米结构。所有纳米材料的X射线衍射（XRD）图谱均显示C-V NO单相立方结构。在700°C下获得的C-V NO表面积低（91.6 m g），石墨化程度适中，孔径分布较宽。在800°C下获得的C-V NO显示出相互连接的网络，具有较高的表面积（121.6 m g）和较窄的孔径分布。相反，在900°C下，C-V NO显示出分解的网络，表面积减少了113 m g。所有合成的C-V NO均产生了介孔氧氮化物纳米结构，使用6 M KOH水性电解质作为温度的函数，以三电极结构对其进行了评估。与它的同类产品相比，C-V NO @ 800°C电极具有卓越的性能，因此具有最高的电化学性能。这些结果表明，氮化温度不仅影响C-V NO的形貌，结构和表面积，还影响其电化学性能。此外，由CV NO @ 800°C制成的对称器件在1.8 V的宽工作电压下在1 A g时分别显示出38 W h kg和764 W kg的比能和功率。就稳定性而言，通过在10,000 A的条件下进行浮动/老化测量长达100 h可以确认10,000次循环的容量保持率达到84.7％。由于碳钒氧氮材料的快速简便的制备，这种对称电容器有望用于实际应用。

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