g-C_(3)N_(4)材料的可控制备及电化学性能研究

Preparation and Electrochemical Properties of g-C_(3)N_(4)

使用高温煅烧法,以三聚氰胺和尿素分别作为原材料,在箱式电阻炉中经过不同温度的煅烧后,得到石墨相氮化碳(g-C_(3)N_(4)).使用X-射线衍射(XRD)法、扫描电子镜(SEM)法表征所制备材料的微观结构和形貌特征.然后将样品做成电极极片,利用电化学工作站,经循环伏安(CV)法、恒流充放电(GCD)法检测电极的电化学性能,研究制备原料、煅烧温度对样品的结构、形貌及样品做成电极材料的电化学性能的影响.经分析XRD和SEM图样得出:尿素制得的样品形貌结构不好,形状像棉絮一样;而三聚氰胺在550℃下制得的样品表现出清晰的片层状结构,且层间有大量孔隙,比表面积大,这样对较大的比电容有很大好处,有益于g-C_(3)N_(4)电极材料在蓄能方向的应用.CV曲线和GCD曲线可以看出:用三聚氰胺在550℃下煅烧制备的g-C_(3)N_(4)所组成的电极材料的电容性和充放电性能良好.

The graphite phase carbon nitride(g-C_(3)N_(4))with different structure and morphology was obtained by calcining melamine and ureophil at different temperatures in a box resistance furnace.The microstructure and morphology of the materials were characterized by using the X-ray diffraction(XRD)and scanning electron microscopy(SEM).Then the samples were made into electrode plates.The electrochemical properties of the electrodes were tested by cyclic voltammetry(CV)and constant current charge-discharge(GCD).The effects of raw materials and calcination temperature on the structure,morphology and electrochemical properties of the samples were studied.The XRD and SEM patterns show that the morphology and structure of the samples prepared by ureophil are not good,resembling a ball of cotton wadding;while the melamine sample prepared at 550℃shows a clear lamellar structure with a large number of pores and a large specific surface area,which is beneficial to the application of g-C_(3)N_(4)electrode material in energy storage.The CV curve and GCD curve show that the electrode material composed of g-C_(3)N_(4)prepared by melamine at 550℃has good capacitance and charge-discharge performance.