5-磺基水杨酸辅助水热法制备Co-Ni层状双氢氧化物及其超电容性能

5-Sulfosalicylic Acid-Assisted Hydrothermal Synthesis and Supercapacitive Properties of Co-Ni Layered Double Hydroxides

采用5-磺基水杨酸(SSA)辅助水热法制备了Co-Ni层状双氢氧化物(CoxNi1-xLDHs),通过X射线衍射(XRD)、傅里叶变换红外(FT-IR)光谱、场发射扫描电镜(FE-SEM)和透射电镜(TEM)研究其结构与形貌.结果表明,通过调控反应体系中Co、Ni的配比,可以得到不同形貌的CoxNi1-xLDHs.在Co的摩尔分数为0.24时,形成了由纳米片组装的花瓣状纳米球.循环伏安和恒流充放电测试表明,这种花瓣状结构的双氢氧化物在1A·g-1电流密度下,比电容值达到1735F·g-1.

Co-Ni layered double hydroxides （CoxNi1-x LDHs） were successfully synthesized by a 5- sulfosalicylic acid （SSA）-assisted hydrothermal process. Structural and morphological characterizations were performed using powder X-ray diffraction （XRD）, Fourier transform infrared （FT-IR） spectroscopy, field emission scanning electron microscopy （FE-SEM）, and transmission electron microscopy （TEM）. The results reveal that different morphologies of CoxNi1-x LDHs could be obtained by tuning the Co/Ni molar ratio. The CoxNi1-x LDHs exhibit petal-like nanospheres that are composed of nanoflakes at a Co molar fraction of 0.24. The LDH of this structure has a specific capacitance of 1735 F·g-1 at a current density of 1 A·g-1 as determined by cyclic voltammetry and galvanostatic charge-discharge.