Nd掺杂的Ni-Al LDHs的制备及其电化学性能研究

Preparation of Nd-doped Ni-Al layered double hydroxide and its electrochemical performance for supercapacitors

采用传统共沉淀法制备了层间阴离子为碳酸根的Ni-Al-Nd三元层状双氢氧化物,利用X射线粉末衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)对合成产物的结构和形貌进行表征。采用循环伏安(CV)、恒电流充放电(GCD)和交流阻抗谱(EIS)对材料的电化学性能进行测试,结果表明,掺杂了钕元素的镍铝层状双氢氧化物相比纯的镍铝层状双氢氧化物,电容性能得到明显提升,在1 A/g电流密度下的比电容从1 605 F/g提升至2 114 F/g。

Ni-Al-Nd ternary layered double hydroxides （LDHs） with carbonate as interlayer anions were synthesizedby conventional co-precipitation method. The structure and morphology of the materials as prepared werecharacterized by X-ray powder diffraction （XRD）. Fourier transform infrared spectroscopy （FT-IR） and scanningelectron microscopy （SEM）. The electrochemical performance of the materials were investigated by cyclicvoltammetrys （CV）, galvanostatic charge/discharge （GCD） and electrochemical impedance spectroscopy （EIS）.These results show that the capacitive performance of Nd-doped Ni-Al LDHs is higher than that of pure Ni-Al LDHs,which has an obvious improvement witha specific capacitance increase from 1 605 to2 114 F/g ata current densityof1 A/g.