High-performance asymmetrical supercapacitor composed of rGO-enveloped nickel phosphite hollow spheres and N/S co-doped rGO aerogel
High-performance asymmetrical supercapacitor composed of rGO-enveloped nickel phosphite hollow spheres and N/S co-doped rGO aerogel
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DOI：
10.1007/s12274-017-1780-3
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发表时间：
2018-02
期刊：
影响因子：
9.9
通讯作者：
Deyang Zhang;Yihe Zhang;Yongsong Luo;Yu Zhang;Xiaowei Li;Xuelian Yu;Hao Ding;P. Chu;Li Sun-Li
中科院分区：
文献类型：
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作者：
Deyang Zhang;Yihe Zhang;Yongsong Luo;Yu Zhang;Xiaowei Li;Xuelian Yu;Hao Ding;P. Chu;Li Sun-Li
制备了一种非对称超级电容器（ASC），其包括作为正极的还原氧化石墨烯（rGO）封装的亚磷酸镍中空微球（NPOH-0.5@rGO）和作为负极的多孔氮/硫共掺杂的rGO气凝胶（NS-3D rGO）。NPOH-0.5@rGO电极结合了NPOH中空微球和导电rGO层的优点，从而产生大的比电容、高的循环可逆性和优异的倍率性能。具有丰富孔隙率和活性位点的NS-3D rGO电极促进电解质渗透并拓宽工作电压范围。ASC（NPOH-0.5@rGO//NS-3D rGO）显示出高达1.4 V的最大电压、出色的循环能力（10，000次循环后电容保持率为95.5%）和出色的倍率性能（当电流密度增加10倍时电容保持率为77%）。充电20 s后，ASC可点亮发光二极管（LED）20 min以上。该制造技术和器件架构可以扩展到用于下一代高性能电化学存储器件的其他活性氧化物和碳基材料。
An asymmetrical supercapacitor (ASC), comprising reduced graphene oxide (rGO)-encapsulated nickel phosphite hollow microspheres (NPOH-0.5@rGO) as positive electrode, and porous nitrogen/sulfur co-doped rGO aerogel (NS-3D rGO) as negative electrode has been prepared. The NPOH-0.5@rGO electrode combines the advantages of the NPOH hollow microspheres and the conductive rGO layers giving rise to a large specific capacitance, high cycling reversibility, and excellent rate performance. The NS-3D rGO electrode with abundant porosity and active sites promotes electrolyte infiltration and broadens the working voltage range. The ASC (NPOH-0.5@rGO//NS-3D rGO) shows a maximum voltage of up to 1.4 V, outstanding cycling ability (capacitance retention of 95.5% after 10,000 cycles), and excellent rate capability (capacitance retention of 77% as the current density is increased ten times). The ASC can light up an light-emitting diodes (LED) for more than 20 min after charging for 20 s. The fabrication technique and device architecture can be extended to other active oxide and carbon-based materials for next-generation high-performance electrochemical storage devices.