一步水热法制备Ni3S2纳米空心球及其在超级电容器中的应用

One-step hydrothermal synthesis of Ni3S2 nano hollow sphere for high-performance supercapacitors

将四水合醋酸镍和L-半胱氨酸分别作为镍源和硫源,采用一步水热法成功制备出了Ni3S2纳米空心球材料.分别利用X射线衍射仪、X射线光电子能谱仪、扫描电子显微镜以及透射电子显微镜等仪器分析材料的形貌、组分和物相结构.结果表明:制备出的Ni3S2为尺寸均一的空心球,直径约300 nm,且具有良好的分散性.将制备出的Ni3S2压在泡沫镍上制成电极,研究其超级电容器的性能,结果显示:Ni3S2纳米空心球具有优良的倍率性能和循环性能,这归因于材料优异的稳定性和特定的空心球状结构,不仅为电极反应提供了丰富的活性位点,还有效缩短了电子以及离子的扩散路径.

Ni3S2 nano hollow sphere was successfully synthesized with one-step hydrothermal method,in which nickel acetate and L-cysteine were used as nickel source and sulfur source,respectively.The morphology,composition,and phase structure of the as-prepared material were characterized by X-ray diffraction(XRD)spectroscopy,X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),and transmission electron microscopy(TEM).The results showed that the as-prepared Ni3S2 was uniform hollow sphere with an average diameter of about 300 nm,and it has good dispersion.The Ni3S2 was pressed on the foam nickel to be a work electrode,and its performance of supercapacitor was investigated.The results suggested that the as-prepared Ni3S2 nano hollow sphere has excellent rate capability and cycle performance.This is due to its good stability and specific hollow spherical structure,which not only provides abundant active sites for electrode reaction,but also effectively shortens the transmission path of electrons and ions.