Interconnected three-dimensional V2O5/polypyrrole network nanostructures for high performance solid-state supercapacitors
Interconnected three-dimensional V2O5/polypyrrole network nanostructures for high performance solid-state supercapacitors
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DOI：
10.1039/c4ta05769d
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发表时间：
2015
影响因子：
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通讯作者：
Tao Qian;Na Xu;Jinqiu Zhou;Tingzhou Yang;Xuejun Liu;Xiaowei Shen;Jiaqi Liang;Chenglin Yan
中科院分区：
文献类型：
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作者：
Tao Qian;Na Xu;Jinqiu Zhou;Tingzhou Yang;Xuejun Liu;Xiaowei Shen;Jiaqi Liang;Chenglin Yan
为了提高超级电容器的赝电容性能，制备了由聚吡咯（PPy）均匀修饰在纳米线上的三维V2 O 5网络组成的超级电容器电极。连续的3D网络为更好的离子传输创造了通道，并且网络中的高度孔连通性增强了质量传输。PPy壳层的存在可以提高材料的导电性，防止钒的溶出。这些优点与V2 O 5和PPy之间的理想协同作用一起导致448 F g-1的高比电容，这是堆叠的V2 O 5的三倍。由V2 O 5/PPy核/壳3D网络组装的全固态对称超级电容器装置在250 W kg−1的功率密度下表现出高能量密度（14.2 W h kg− 1）和良好的循环稳定性（1000次循环后电容保持率为81%）。此外，所制备的器件可以在充电仅10 s后有效地为红色发光二极管指示器供电。
Supercapacitor electrodes composed of a 3D V2O5 network with polypyrrole (PPy) uniformly decorated onto each nanowire were fabricated to enhance their pseudocapacitive performance. The continuous 3D network creates channels for better ion transport, and the high degree of pore connectivity in the network enhances the mass transport. The PPy shell could enhance the electric conductivity and prevent the dissolution of vanadium. These merits together with the ideal synergy between V2O5 and PPy lead to a high specific capacitance of 448 F g−1, which is three times higher than that of the stacked V2O5. The all-solid-state symmetric supercapacitor device assembled by the V2O5/PPy core/shell 3D network exhibits a high energy density (14.2 W h kg−1) at a power density of 250 W kg−1 and good cyclic stability (capacitance retention of 81% after 1000 cycles). Furthermore, the prepared device could power a red light-emitting diode indicator efficiently after charging for only 10 s.