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为了提高新型储能材料碳酸锰(MnCO3)的导电性和应用于超级电容器的性能,我们采用简单温和的液相沉积法,在室温下制备出MnCO3/CB复合材料。导电炭黑(CB)先用稀HNO3进行纯化和活化的处理,再将处理后的CB放入NH4HCO3和MnSO4的混合溶液中进行液相沉淀。利用红外和XPS方法观察经过稀酸纯化处理后,炭黑表面的负电基团(羧基和醌基)增多,使得其在水中不易团聚,更有利于合成均匀的复合物。利用SEM对复合物形貌进行了表征,直径40 nm的炭黑颗粒将莲花状的碳酸锰颗粒包裹,并在碳酸锰颗粒之间堆积形成含有孔隙的空间结构。利用恒流充放电测试其电化学性能,结果表明,MnCO3/CB复合电极材料的质量比容值是纯粹Mn CO3电极材料的2倍并且具有良好循环容量保持率。MnCO3作为一种新近发现的储能材料,合成复合物为其作为超级电容器电极材料提供了新的思考方向。
In order to improve the electrical conductivity of manganese carbonate (MnCO3) as a new type of energy storage material and its application to supercapacitors, MnCO3 / CB composites were prepared at room temperature by simple and mild liquid phase deposition. Conductive carbon black (CB) is first purified and activated with dilute HNO3, then the treated CB is placed in a mixed solution of NH4HCO3 and MnSO4 for liquid phase precipitation. The infrared and XPS methods observed after purification by dilute acid, the carbon black surface of the negative groups (carboxyl and quinone groups) increased, making it difficult to agglomerate in water, more conducive to the synthesis of uniform composite. The morphology of the composites was characterized by SEM. Carbon black particles with a diameter of 40 nm encapsulated the lotus-shaped manganese carbonate particles and formed a pore-containing spatial structure between the manganese carbonate particles. The electrochemical performance was tested by constant current charge-discharge test. The results showed that the mass specific capacitance of MnCO3 / CB composite electrode material was twice that of pure MnCO3 electrode material and had a good cycling capacity retention. As a recently discovered energy storage material, MnCO3 provides a new way of thinking for its application as an electrode material for supercapacitors.