School of Integrative Biological and Chemical Sciences, University of Texas Rio Grande Valley, 1 West University Blvd., Brownsville, TX 78521, USA.
Escuela de Ingeniería y Ciencias, Tecnológico de Monterrey, Av E. Garza Sada 2501, Monterrey 64849, NL, Mexico.
Int J Mol Sci. 2024 Jun 25;25(13):6952. doi: 10.3390/ijms25136952.
The present work focuses on the synthesis of a vanadium nitride (VN)/carbon nanocomposite material via the thermal decomposition of vanadyl phthalocyanine (VOPC). The morphology and chemical structure of the synthesized compounds were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoemission spectroscopy (XPS). The successful syntheses of the VOPC and non-metalated phthalocyanine (HPC) precursors were confirmed using FTIR and XRD. The VN particles present a needle-like morphology in the VN synthesized by the sol-gel method. The morphology of the VN/C composite material exhibited small clusters of VN particles. The XRD analysis of the thermally decomposed VOPC indicated a mixture of amorphous carbon and VN nanoparticles (VN(TD)) with a cubic structure in the space group FM-3M consistent with that of VN. The XPS results confirmed the presence of V(III)-N bonds in the resultant material, indicating the formation of a VN/C nanocomposite. The VN/C nanocomposite synthesized through thermal decomposition exhibited a high carbon content and a cluster-like distribution of VN particles. The VN/C nanocomposite was used as an anode material in LIBs, which delivered a specific capacity of 307 mAh g after 100 cycles and an excellent Coulombic efficiency of 99.8 at the 100th cycle.
本工作通过热分解邻苯二甲酸氧钒(VOPC)合成了氮化钒(VN)/碳纳米复合材料。采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、能谱(EDS)、傅里叶变换红外光谱(FTIR)、X 射线衍射(XRD)和 X 射线光电子能谱(XPS)对合成化合物的形貌和化学结构进行了表征。通过 FTIR 和 XRD 证实了 VOPC 和非金属酞菁(HPC)前体的成功合成。溶胶-凝胶法合成的 VN 中,VN 颗粒呈针状形态。VN/C 复合材料的形态显示出 VN 颗粒的小簇。热分解 VOPC 的 XRD 分析表明,具有立方结构的 FM-3M 空间群的非晶态碳和 VN 纳米颗粒(VN(TD))的混合物,与 VN 的一致。XPS 结果证实了所得材料中存在 V(III)-N 键,表明形成了 VN/C 纳米复合材料。通过热分解合成的 VN/C 纳米复合材料具有高的碳含量和 VN 颗粒的团簇状分布。VN/C 纳米复合材料用作 LIBs 的阳极材料,在 100 次循环后具有 307 mAh g-1 的比容量,在第 100 次循环时具有 99.8%的优异库仑效率。