含铌电容材料的制备及其性能

Preparation and Properties of Niobium-Containing Capacitor Material

以草酸铌铵和葡萄糖为原料,经水热反应在泡沫镍基底上负载了含Nb的电容材料。通过红外光谱仪(FTIR)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)等技术手段对制备的样品进行表征,比较不同条件下的含Nb电容材料的表面形貌,得出水热反应的最佳工艺条件,并对样品的电化学性能进行了研究。结果表明,制备含Nb电容材料的最佳工艺条件是葡萄糖和草酸铌铵的摩尔比为7∶1,反应温度200℃,反应时间18 h,在此条件下,负载在泡沫镍上的含Nb氧化物的量为0.3707 g/cm2;当充放电电流密度为0.5 A/g时,含Nb电容材料的最大比电容能达到189.47 F/g,经过1000次循环后,其放电比电容的保持率仍保持在95%以上,是一种具有应用前景的超级电容器材料。

Nb-containing capacitor material on foamed nickel substrate was prepared by the hydrothermal reaction with ammonium niobium oxalate and glucose as the starting meterials. The prepared samples was characterized by infrared spectroscopy（ FTIR）,scanning electron microscopy（ SEM）,X-ray diffraction（ XRD）and electrochemical testing. By comparation of surface topography of products under different conditions,the optimal conditions of hydrothermal reaction for preparing Nb-capacitor material are established as： the molar ratio of glucose and ammonium oxalate is 7 ∶ 1,and reaction temperature and time are 200 ℃ and 18 h,respectively. The Nb-containing oxide loaded on the foamed nickel is 0. 3707 g / cm^2. The maximum capacity of Nb-containing capacitor material reaches 189. 47 F / g at the current density of 0. 5 A / g. After 1000 cycles,the discharge capacitance of holding rate remains at 95%. This indicates that it is a promising candidate as the super capacitor materials.