La/PB纳米立方体复合材料的制备及电化学储能性能

Preparation and electrochemical energy storage performance of La/PB nanocube composites

采用化学共沉淀法,在室温下制备掺杂La元素的普鲁士蓝纳米立方(La/PB)电极材料.通过扫描电子显微镜(SEM)和能量色散光谱仪(EDS)对样品进行物理表征;利用电化学测试中的循环伏安法(CV)和交流阻抗法(EIS)对样品的电化学性能进行研究.结果表明:金属La可以掺杂在PB纳米立方颗粒的表面,且掺杂后的复合材料电化学性能优于前体PB材料.在La离子和PB粉末的掺杂质量比为20%时,产物La/PB电化学性能最佳.于碱性介质1 mol/L氢氧化钾溶液中,在3 mV/s的扫描速度下其质量比容量达到421.91 F/g,在50 mV/s的扫速下质量比电容也能达到167.76 F/g.且该电极材料表现出良好的赝电容属性,在50 mV/s的扫速下赝电容贡献率高达75.96%.

Prussian blue nanocube(La/PB)electrode materials doped with La were prepared by chemical coprecipitation at room temperature.The samples were characterized by scanning electron microscope(SEM)and energy dispersive spectrometer(EDS).Cyclic voltammetry(CV)and alternating current impedance(EIS)were used to study the electrochemical properties of the samples.The results show that:La can be doped on the surface of PB nano-cubic particles,and the electrochemical performance of the doped composite is better than the precursor PB material.When the mass ratio of La ion to PB powder is 20%,the electrochemical performance of the product La/PB is the best.At the scanning speed of 3 mV/s,the specific mass capacity reaches 421.91 F/g,and the specific mass capacitance reaches 167.76 F/g at the scanning speed of 50 mV/s.Moreover,the electrode material shows good pseudocapacitance properties,and the contribution rate of pseudocapacitance is as high as 75.96%at the scanning speed of 50 mV/s.