石墨烯
超级电容器
材料科学
氧化物
阳极
电化学
磷酸铁锂
电容
化学工程
煅烧
电极
储能
电导率
纳米技术
冶金
化学
催化作用
生物化学
功率(物理)
物理
物理化学
量子力学
工程类
作者
Zhenyuan Ji,Lizhi Chen,Guanxiang Tang,Jiali Zhong,Aihua Yuan,Guoxing Zhu,Xiaoping Shen
出处
期刊:Small
[Wiley]
日期:2023-11-27
卷期号:20 (15)
标识
DOI:10.1002/smll.202306236
摘要
The core strategy for constructing ultra-high-performance hybrid supercapacitors is the design of reasonable and effective electrode materials. Herein, a facile solvothermal-calcination strategy is developed to deposit the phosphate-functionalized Fe2O3 (P-Fe2O3) nanosheets on the reduced graphene oxide (rGO) framework. Benefiting from the superior conductivity of rGO and the high conductivity and fast charge storage dynamics of phosphate ions, the synthesized P-Fe2O3/rGO anode exhibits remarkable electrochemical performance with a high capacitance of 586.6 F g-1 at 1 A g-1 and only 4.0% capacitance loss within 10 000 cycles. In addition, the FeMoO4/Fe2O3/rGO nanosheets are fabricated by utilizing Fe2O3/rGO as the precursor. The introduction of molybdates successfully constructs open ion channels between rGO layers and provides abundant active sites, enabling the excellent electrochemical features of FeMoO4/Fe2O3/rGO cathode with a splendid capacity of 475.4 C g-1 at 1 A g-1. By matching P-Fe2O3/rGO with FeMoO4/Fe2O3/rGO, the constructed hybrid supercapacitor presents an admirable energy density of 82.0 Wh kg-1 and an extremely long working life of 95.0% after 20 000 cycles. Furthermore, the continuous operation of the red light-emitting diode for up to 30 min demonstrates the excellent energy storage properties of FeMoO4/Fe2O3/rGO//P-Fe2O3/rGO, which provides multiple possibilities for the follow-up energy storage applications of the iron-based composites.
科研通智能强力驱动
Strongly Powered by AbleSci AI