铁基层状双金属氢氧化物超级电容器电化学性能的研究

Study on the Electrochemical Performance of Fe-Based Layered Double-metal Hydroxide Supercapacitor

采用共沉淀法制备层状双金属氢氧化物(LDHs),通过X射线衍射(XRD),傅里叶变换红外光谱(FT-IR),扫描电镜(SEM)对其形貌与结构进行物理表征。采用循环伏安法,恒流充放电法等电化学常用方法系统地研究所组装成三电极体系超级电容器的电化学性能。该铁基超级电容器所需原料铁元素储备丰富、价格低廉,且制备方法简单,因而有望成为超级电容器制备中的备选材料。研究表明,当Ni^(2+)-Fe^(3+)层状双金属氢氧化物,镍和铁样品物质的量比为1∶1时,表现出较好的电容器性能;当电流密度为1A·g^(-1)时,其比容量达224.25F·g^(-1),并表现出良好的循环性能。

The layered double metal hydroxide is prepared by the coprecipitation method, and its morphology and structure are characterized by X-ray diffraction, Fourier transform infrared spectroscopy and SEM method. The electrochemical properties of three-electrode system supercapacitor are studied by cyclic voltammetry and constant current charge and discharge method. For the rich reserves of raw material iron, low price, and the simple preparation method, the Fe-based supercapacitor is expected to become an alternative material for preparing supercapacitor. The research shows that when the molar ratio of nickel to iron is 1：1, the Ni2＋-Fe3＋ layered double metal hydroxide will exhibit a better capacitor performance. When the current density is 1A·g-1, the specific capacity will reach 224.25F·g-1, and shows a good cycle performance.