Co(OH)2/GO复合物的制备及其电化学性能研究

Preparation and electrochemical properties of Co(OH)_2/GO complex

以硫酸钴和氧化石墨为原料,采用化学沉淀法制备出疏松多孔的片状Co(OH)_2/GO复合物。复合物的结构和形貌用X射线衍射(XRD)、场发射扫描电镜(SEM)进行了表征;用傅里叶变换红外光谱(FT-IR)对样品的成分进行了测定;复合物的电化学性能用循环伏安、恒电流充放电等测试方法进行了测试。经分析测试结果,发现采用该方法制备的样品,其电化学性能与氧化石墨的含量有关;当氧化石墨含量为10%时性能最佳,比电容达到1498F/g。此外,电流密度为1A/g时,600次充放电循环后比电容仍保留了初始值的85.3%。因此,Co(OH)_2/GO复合物有望成为电化学电容器电极材料。

Co（OH）2/GO composites with porous and layered structure were prepared by chemical precipitated method in which cobalt sulfate and graphite oxide were used as the raw material. The as-prepared materials were characterized by X-ray diffraction （XRD） and field emission scanning electron microscopy （FESEM）. The composition of the Co（OH）2/GO composite was analyzed through fourier transform infrared spectroscopy （FT-IR）. The electrochemical performance of Co（OH）2/GO composite was evaluated using Cyclic voltammetry （CV） and galvanostatic charge/discharge method. The measurements showed that the electrochemical properties of the samples prepared by this method are related to the content of graphite oxide. When the content of graphite oxide is 10%, the performance is uppermost, capacitance achieved 1498F/g. In addition, when the current density is 1A/g, 85.3% of the initial value was retained after 600 charge-discharge cycles. Therefore, the Co（OH）2/GO composite is expected to be electrochemical capacitor electrode material.