Fe基普鲁士蓝@纳米多孔碳复合材料的制备及其电容性能  

Preparation and Supercapacitive Properties of Fe-based Prussian Blue@Nanoporous Carbon Composites

作　　者：陈秋爽 赵春霞 陈业凯[2] 陈文 CHEN Qiushuang;ZHAO Chunxia;CHEN Yekai;CHEN Wen(Hubei Longzhong Laboratory,Xiangyang 441000,Hubei,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan,430070,China)

机构地区：[1]湖北隆中实验室,湖北襄阳441000 [2]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《硅酸盐学报》2024年第9期3055-3062,共8页Journal of The Chinese Ceramic Society

基　　金：湖北隆中实验室自主创新研究项目(2022ZZ-35)。

摘　　要：Fe基普鲁士蓝(PB)具有开放的框架结构和高理论容量,但是导电性不佳,这限制了其倍率性能和循环性能。利用溶液共沉淀法成功将PB负载于纳米多孔碳(NPC)上,制备出普鲁士蓝@纳米多孔碳复合材料(PB@NPC)。PB@NPC比表面积高达2122 m^(2)/g,充分发挥出双电层电容和赝电容的协同作用,具有高容量和良好的导电性。在扫速为5 mV/s时的比电容为483.45 F/g,在0.2 A/g下的比电容为309.35 F/g。将PB@NPC电极组装成对称式电容器,循环1000圈后的容量保持率为91%,具有优异的循环稳定性。Introduction Supercapacitors(Scs)are known as one of the most promising energy storage devices due to their high-power density and excellent cycle stability.The performance of Scs is closely related to the electrochemical performance of electrode materials.The widely-used electrodes are carbon-based materials and their derivatives.Carbon materials contribute energy storage based on double layer capacitance associated with ion adsorption and desorption,achieving excellent power density and cycle stability.However,they lack in high capacitance because of limitation of surface area.Instead,Fe-based Prussian blue(PB)is a promising pseudocapacitive material with open frame structure and high theoretical capacitance,but the poor electrical conductivity limits its rate performance and cycle stability.Combining PB with carbon materials is considered as an effective solution to develop advanced electrode composites.Herein,nanoporous carbon(NPC)derived from lignite has been prepared with high specific surface area and good electrical conductivity.Then,Fe-Prussian blue was successfully loaded on NPC via co-precipitation method to obtain Fe-Prussian blue@nanoporous carbon composite(PB@NPC).The fabricated PB@NPC composite possesses high specific surface area,high specific capacitance and excellent cycle stability.Methods The lignite powder was obtained by crushing the lignite with 100 mesh and sifting,and then mixed in 4 mol/L HNO_(3)and stirred for 8-10 h.After washing and drying,the collection was dispersed in 5 mol/L NaOH for 8-10 h with stirring,following by washing with deionized water and drying to obtained pre-treated lignite.Then,the pre-treated lignite was mixed with KOH at a mass ratio of 1:3 and heat treated at 800℃in Ar atmosphere for 1 h,and then washed and dried to obtain nanoporous carbon(NPC).0.32 g FeCl_(3)·6H_(2)O was dissolved in 100 mL deionized water.0.5 g NPC and 0.37 g K4Fe(CN)6·3H_(2)O were mixed with 100 mL deionized water and ultrasonicated to obtain a black suspension.Then,ferric chloride soluti

关 键 词：Fe基普鲁士蓝 纳米多孔碳 溶液共沉淀法 协同作用 对称电容器 

分 类 号：TB332[一般工业技术—材料科学与工程] O646[理学—物理化学]