Preparation of La0.7Sr0.3CoO3-δ (LSC)@MnO2 core/shell nanorods as high-performance electrode materials for supercapacitors
- 84 Downloads
Perovskite oxides have attracted significant attention as capacitor electrode materials owing to their unique physical and electronic properties. In this paper, a novel La0.7Sr0.3CoO3-δ (LSC)@MnO2 core–shell nanorod was synthesized by controlled electrospinning combined with hydrothermal synthesis. The LSC, as a typical perovskite-type material, with excellent stability and ion–electron double conductivity, can perfectly serve as conductive backbone. Grid-like MnO2 nanosheets are grown on LSC to form a unique core/shell nanostructure, could effectively improve the electrochemical performance of MnO2. The grid-like MnO2 nanosheets shell significantly increase the effective area over which the reaction may take place and reduce the ion/electron transmission distance, which is beneficial in that it shifts in ions and electrons, enhancing the electrochemical reaction kinetics thereof. LSC@MnO2 core/shell nanorods demonstrated good electrochemical performance with high capacitance (570 F g−1 at 1 A g−1), and revealed excellent cycling stability (capacitance retention remains at 97.2% after 5000 cycles). The asymmetric supercapacitor device (LSC@MnO2//AC) displayed a desirable energy density of 37.6 W h kg−1 at 375 W kg−1, and still remains at 23.3 W h kg−1 at a high power density of 7489.3 W kg−1, indicating that the LSC@MnO2 nanorods are an outstanding pseudo-capacitive electrode material, with significant potential for application in high-performance supercapacitors.
This work was supported by Joint fund between Shenyang National Laboratory for Materials Science and State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals [Grant Numbers 18LHPY006]; the Key Research and Development Program of Gansu Province [Grant Numbers 17JR7GA014]; National Natural Science Foundation of China [Grant Numbers 51674130].
Compliance with ethical standards
Conflict of interest
There are no conflicts to declare.
- 3.P. Liu, J. Liu, S. Cheng, W. Cai, F. Yu, Y. Zhang, P. Wu, M. Liu, Chem. Eng. J. 328, 1385–8947 (2017)Google Scholar
- 13.X. Wang, Y. Fang, B. Shi, F. Huang, F. Rong, Chem. Select. 2, 9267–9276 (2017)Google Scholar
- 23.P. Guo, X. Huang, X. Zhu, Z. Lü, Y. Zhou, Fuel Cells. 13, 666–672 (2013)Google Scholar
- 36.P. Liu, Z. Hu, Y.f. Liu, M. Yao, Q. Zhang, Z.j. Xu, Int. J. Electrochem. Sci. 9, 7986–7996 (2016)Google Scholar
- 42.H. Gao, S. Cao, Y. Cao, Electrochim. Acta. 2017, 240 (2017)Google Scholar