Biological cell template synthesis of nitrogen-doped porous hollow carbon spheres/MnO2 composites for high-performance asymmetric supercapacitors
By W. Du, Xiaoning Wang, Jie Zhan, Xueqin Sun, Litao Kang, Fuyi Jiang, Xiaoyu Zhang, Qian Shao, Mengyao Dong, Hu Liu and 2 more. Electrochimica Acta, 2019
409 citations recorded by the source corpus.
Abstract Nitrogen-doped porous hollow carbon spheres were fabricated via hydrothermal pre-carbonization and pyrolysis carbonization using yeast cell templates. After that, the MnO2 nanowires were deposited by the in-situ hydrothermal reaction. By controlling the reaction concentration, various MnO2 nanostructures with different morphologies and electrochemical properties were obtained. The as-prepared sample exhibited an ultrahigh specific capacitance of 255 F g-1 at a current density 1 A g-1 in 1 M Na2SO4 electrolyte. The MnO2/HCS-30 material was used as the positive electrode, and the HCS was used as the negative electrode to assemble the asymmetric supercapacitor. The maximum energy density operating at the 2.0 V voltage window is 41.4 Wh kg−1 at a power density of 500 W kg−1 and still maintains 23.0 Wh kg−1 at a power density of 7901 W kg−1. Moreover, it displayed excellent cycle stability, retained approximately 93.9% of the capacitance after 5000 cycles. This work innovatively combines biomass and energy, provides an environmentally benign strategy and new insights for the preparation of electrode materials.
Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Renewable Energy, Sustainability and the Environment
View Paper: https://www.semanticscholar.org/paper/b6d25b1f23a1692fc295cfd9c84ce28aa1700139
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Citations in the corpus
- Review and prospect of MnO2-based composite materials for supercapacitor electrodes (2019, methodology): “[71] has prepared nitrogen-doped porous hollow carbon spheres (HCS) and MnO2 nanowires grown on the HCS (MnO2/HCS-t, t % is the reaction concentrations of KMnO4) by hydrothermal precarbonization and pyrolysis carbonization method and in-situ hydrothermal method respectively (Fig.”