MnCO3/CB复合材料应用于超级电容器性能研究

摘要

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方法观察发现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MnCO3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路.%In order to improve the characterization of MnCO3,a three-dimensional composite of MnCO3 and carbon black (CB) is built via a quite simple co-precipitation method at room temperature.Firstly we use concentrate HNO3 to purify and activate the CB,then we put the CB into the mixture of NH4HCO3 and MnSO4 for co-precipitation.We find many negative groups (carboxyl and quinone) on the purified CBs' surface by FT-IR and XPS,which make CB difficult to reunite in the water.MnCO3 like lotus is mixed with flocculated carbon black with diameter 700 nm which is identified by SEM.The result of XRD shows that the fiber like product is MnCO3.The cyclic voltammetry of the MnCO3/CB nanocomposite shows better electrochemical performance than pure MnCO3.As a new capacitor energy storage material,MnCO3/CB composite provide a new direction for supercapacitor electrode material.