聚苯胺/二氧化锰/聚吡咯复合纳米球的制备及其电化学储能性  

Preparation and electrochemical energy storage of polyaniline/manganese dioxide/polypyrrole composite nanospheres

作　　者：徐东 田杜 陈龙 张禹 尤庆亮[1] 胡成龙[1] 陈韶云[1] 陈建 XU Dong;TIAN Du;CHEN Long;ZHANG Yu;YOU Qingliang;HU Chenglong;CHEN Shaoyun;CHEN Jian(Key Laboratory of Optoelectronic Chemical Materials and Devices,Ministry of Education,School of Optoelectronic Materials&Technology,Jianghan University,Wuhan 430056,Hubei,China;Instrumental Analysis and Research Center,Sun Yat-sen University,Guangzhou 510275,Guangdong,China)

机构地区：[1]江汉大学光电材料与技术学院,光电化学材料与器件教育部重点实验室,湖北武汉430056 [2]中山大学测试中心,广东广州510275

出　　处：《化工学报》2023年第3期1379-1389,共11页CIESC Journal

基　　金：国家自然科学基金项目(51973244)。

摘　　要：利用化学合成法成功制备了尺寸分布均一的聚吡咯(polypyrrole,PPy)纳米球,通过酸解法将KMnO4分解成MnO_(2)纳米片原位生长在PPy纳米球表面,然后采用稀溶液合成法将聚苯胺(polyaniline,PANI)生长在MnO_(2)表面,得到PANI@MnO_(2)@PPy三元复合材料。扫描电子显微镜、透射电镜、拉曼光谱、X射线粉末衍射和X射线光电子能谱证实PANI@MnO_(2)@PPy成功合成。通过溶液涂覆法,将PANI@MnO_(2)@PPy三元复合材料制备成电极并测定其电化学储能性,在1 mol·L^(-1)Na2SO4电解质溶液中,当电流密度为0.5 A·g^(-1)时,PANI@MnO_(2)@PPy电极的比电容量约为357 F·g^(-1),是MnO_(2)@PPy电极的1.96倍;当电流密度从0.5 A·g^(-1)增加到5.0 A·g^(-1)时,PANI@MnO_(2)@PPy电极的电容损失率为26.9%,说明复合体系具有良好的倍率性能;当电流密度为10.0 A·g^(-1)时,PPy、MnO_(2)@PPy和PANI@MnO_(2)@PPy电极经过1000次的循环恒电流充放电后电容保持率分别为45%、70%和76%,其中PANI@MnO_(2)@PPy电极电容保持率最高,说明PPy、PANI和MnO_(2)三者的协同作用,能有效提高三元复合体系的长寿命循环稳定性。Polypyrrole(PPy)nanospheres with uniform size distribution were successfully prepared by chemical synthesis,and then KMnO4 was decomposed into MnO_(2)by acid hydrolysis.Finally,the polyaniline(PANI)in-situ grew on the surface of MnO_(2)by dilute solution synthesis to form PANI@MnO_(2)@PPy ternary composite.Scanning electron microscope,transmission electron microscope,Raman spectroscopy,X-ray powder diffraction and X-ray photoelectron spectroscopy confirmed that the PANI@MnO_(2)@PPy was successfully synthesized.The PANI@MnO_(2)@PPy ternary composite was prepared as electrode by solution coating and its electrochemical energy storage capacity was measured in 1 mol·L^(-1)Na2SO4 electrolyte solution.The specific capacitance of PANI@MnO_(2)@PPy electrode was about 357 F·g^(-1)at a current density of 0.5 A·g^(-1),which was 1.96 times compare to the MnO_(2)@PPy electrode.The capacitance loss of PANI@MnO_(2)@PPy electrode was 26.9%when the current density increased from 0.5 A·g^(-1)to 5.0 A·g^(-1),indicating it had good rate capability.When the current density was 10.0 A·g^(-1),the capacitance retention rate of PPy,MnO_(2)@PPy and PANI@MnO_(2)@PPy electrodes were 45%,70%and 76%respectively,after 1000 cycles of constant current charge and discharge,which showed that the chemical modification of PPy through PANI and MnO_(2)could effectively improve the long-life cycle stability of PANI@MnO_(2)@PPy.

关 键 词：聚合物 复合材料 纳米结构 电极材料 超级电容器 

分 类 号：O631[理学—高分子化学]