摘要
为实现非对称超级电容器(ASC)的高电化学性能,以FeCl_(3)·6H_(2)O为铁源,通过水热法将α-Fe_(2)O_(3)纳米颗粒均匀分散在还原的氧化石墨烯(RGO)薄片上,成功制备α-Fe_(2)O_(3)/RGO复合材料。该复合材料采用SEM、TEM、XRD和XPS进行表征,并利用标准三电极体系进行电化学性能测试。结果显示:高度组装的α-Fe_(2)O_(3)/RGO在1 A·g^(-1)下具有740.8 F·g^(-1)的大比电容,并且于5 A·g^(-1)下实现80.0%的长循环稳定性(10000圈)。以制备的α-Fe_(2)O_(3)/RGO为负极,NiCo_(2)O_(4)为正极组装了NiCo_(2)O_(4)//α-Fe_(2)O_(3)/RGO非对称超级电容器,不仅在792.8 W·kg^(-1)下获得47.8 Wh·kg^(-1)的能量密度,而且在5 A·g^(-1)下仍然维持78.6%的循环稳定性(10000圈)。这极大地促进了ASC在储能系统的应用。
Theα-Fe_(2)O_(3)/RGO composite withα-Fe_(2)O_(3)nanoparticles(FeCl_(3)·6H_(2)O as the iron source)uniformly dispersed on reduced graphene oxide(RGO)flakes was successfully prepared by a hydrothermal method to achieve high electrochemical performance of asymmetric supercapacitors(ASCs).It was characterized by SEM,TEM,XRD,and XPS.And electrochemical properties were tested using a standard three-electrode system.The results show that the highly assembledα-Fe_(2)O_(3)/RGO has a large specific capacitance of 740.8 F·g^(-1)at 1 A·g^(-1)and a long cycle stability of 80.0%(10000 cycles)at 5 A·g^(-1).The NiCo_(2)O_(4)//α-Fe_(2)O_(3)/RGO asymmetric supercapacitor was assembled with the preparedα-Fe_(2)O_(3)/RGO as the negative electrode and NiCo2 O4 as the positive electrode.The energy density of 47.8 Wh·kg^(-1)was obtained at 792.8 W·kg^(-1),and 78.6%cyclic stability(10000 cycles)was maintained at 5 A·g^(-1).This greatly promotes the application of ASCs in energy storage systems.
作者
王宏智
包赛赛
苏展
于金山
张卫国
WANG Hongzhi;BAO Saisai;SU Zhan;YU Jinshan;ZHANG Weiguo(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;Tianjin Electric Power Research Institute,State Grid Tianjin Electric Power Company,Tianjin 300384,China;Tianjin Key Laboratory of Internet of Things in Electricity,Tianjin 300384,China;Tianjin University of Sport,Tianjin 301617,China)
出处
《化学工业与工程》
北大核心
2025年第1期88-97,共10页
Chemical Industry and Engineering
