高结晶度镍铝水滑石的制备及其电化学行为研究

水滑石(Hydrotalcite,简称HT)是一类层状结构的阴离子粘土,它具有碱性特征、微孔结构、记忆效应及金属离子的同晶可取代性和层间阴离子的可交换性.此外,由于它具有材料廉价易得,独特的离子交换性能,很好的热和化学稳定性等特点,使其在电分析方面作为安培传感器~(1])、电位传感器~(2])、生物传感器~(3])以及作为超级电容器的电极活性材料~(4-6])刮都有潜在应用价值.

Studies on the preparation and electrochemical performance of Ni/Al hydrotalcite with high crystallinty

Using urea and alkali as precipitators, a series of carbonate pillared Ni/Al hydrotalcite were synthesized by hydrothermal methods. The crystal structure and morphology of Ni/Al hydrotalcite were characterized by XRD, FT-IR and TEM. The electrochemical properties of Ni/Al hydrotalcite modified electrode in 0. 5 mol/L NaOH electrical media was investigated by cyclic voltammetry and alternating current impedance measurements. The results indicate that the obtained samples synthesized using two different precipitators have the typical layered structure ordering of hydrotalcite and nice crystal forms;Moreover, layered double hydroxides synthesized by homogeneous precipitation through urea hydrolysis have better crystallization than samples using alkali as precipitator;Furthermore, electrochemical reaction in 0. 5 mol/L NaOH electrical media occurs under semi-infinite linear diffusion conditions, the stability and the cyclic capability of hydrotalcite modified electrode are related to its crystallinity, the higher the crystallinity is, the better the stability and the cyclic capability are.