文献类型：期刊文献

英文题名：Rational design of novel ultra-small amorphous Fe2O3 nanodots/graphene heterostructures for all-solid-state asymmetric supercapacitors

作者：Wu, Chenxiao[1,2];Zhang, Zhifang[3];Chen, Zhonghui[2];Jiang, Zuimin[3];Li, Huiyu[1];Cao, Haijing[1];Liu, Yongsheng[1];Zhu, Yanyan[1];Fang, Zebo[4];Yu, Xiangrong[5]

机构：[1]Shanghai Univ Elect Power, Coll Math & Phys, Shanghai 200090, Peoples R China;[2]Henan Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Special Funct Mat, Kaifeng 475004, Peoples R China;[3]Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China;[4]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[5]Jinan Univ, Zhuhai Hosp, Zhuhai Peoples Hosp, Dept Med Imaging, Zhuhai 519000, Peoples R China

年份：2021

卷号：14

期号：4

起止页码：953

外文期刊名：NANO RESEARCH

收录：SCI-EXPANDED(收录号：WOS:000588879900001)、、WOS

基金：We acknowledged the support by the fund for post-doctoral program of Henan University to Z. H. C. (No. FJ3050A0670001) and the National Natural Science Foundation of China (Nos. 51672172 and 51872186).

语种：英文

外文关键词：graphene; heterostructures; amorphous Fe2O3; Co3O4; all-solid-state asymmetric supercapacitors

外文摘要：Constructing graphene-based heterostructures with large interfacial area is an efficient approach to enhance the electrochemical performance of supercapacitors but remains great challenges in their synthesis. Herein, a novel ultra-small amorphous Fe2O3 nanodots/graphene heterostructure (a-Fe2O3 NDs/RGO) aerogel was facilely synthesized via excessive metal-ion-induced self-assembly and subsequent calcination route using Prussian blue/graphene oxide (PB/GO) composite aerogel as precursors. The deliberately designed a-Fe2O3 NDs/RGO heterostructure offers a highly interconnected porous conductive network, large heterostructure interfacial area, and plenty of accessible active sites, greatly facilitating the electron transfer, electrolyte diffusion, and pseudocapacitive reactions. The obtained a-Fe2O3 NDs/RGO aerogel could be used as flexible free-standing electrodes after mechanical compression, which exhibited a significantly enhanced specific capacitance of 347.4 F.g(-1) at 1 A.g(-1), extraordinary rate capability of 184 F.g(-1) at 10 A.g(-1), and decent cycling stability. With the as-prepared a-Fe2O3 NDs/RGO as negative electrodes and the Co3O4 NDs/RGO as positive electrodes, an all-solid-state asymmetric supercapacitor (a-Fe2O3 NDs/RGO//Co3O4 NDs/RGO asymmetric supercapacitor (ASC)) was assembled, which delivered a high specific capacitance of 69.1 F.g(-1) at 1 A.g(-1) and an impressive energy density of 21.6 W.h.kg(-1) at 750 W.kg(-1), as well as good cycling stability with a capacity retention of 94.3% after 5,000 cycles. This work provides a promising avenue to design high-performance graphene-based composite electrodes and profound inspiration for developing advanced flexible energy-storage devices.