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Hierarchical Core-Shell Structure of NiCo2O4 Nanosheets@HfC Nanowires Networks for High Performance Flexible Solid-State Hybrid Supercapacitor
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2020-03-20 , DOI: 10.1016/j.cej.2020.124820
Xuemin Yin , Hejun Li , Yanqin Fu , Ruimei Yuan , Jinhua Lu

Rationally constructing the electrode with the hierarchical structure, different components, and the flexibility is a promising approach to further improve the electrochemical properties and meet the demand for flexible electronic devices. In this paper, for the first time, hafnium carbide nanowires (HfCNWs) networks, with the metrics of large specific surface area, excellent conductivity, and chemical/physical stability, are served as nanoscale conductive skeletons on carbon cloth (CC) for supporting the porous NiCo2O4 nanosheets (NSs). Benefiting from the structural advantages, the as-formed free-standing core-shell NiCo2O4NSs@HfCNWs/CC exhibits a high specific capacitance of 2102 F g-1 at a current density of 1 A g-1, good rate capability (85% capacitance retention at 20 A g-1) and outstanding cycling stability (98% capacitance retention after 5000 cycles at 10 A g-1). Additionally, assembled with the NiCo2O4NSs@HfCNWs/CC and activated carbon (AC)/CC, the flexible solid-state hybrid supercapacitor displays a high energy density of 53 Wh kg-1 at a power density of 800 W kg-1 and excellent performance stability with good flexibility. More impressively, our work could not only further widen the application of HfCNWs, but also put forward the new thinking of rational construction of high-performance flexible supercapacitors.



中文翻译:

用于高性能柔性固态混合超级电容器的NiCo2O4 Nanosheets @ HfC纳米线网络的分层核-壳结构

合理地构造具有分层结构,不同组件和柔性的电极是一种有前途的方法,可以进一步提高电化学性能并满足对柔性电子器件的需求。本文首次将具有较大比表面积,出色的电导率和化学/物理稳定性等指标的碳化ha纳米线(HfC NWs)网络用作碳布(CC)上的纳米级导电骨架,以进行支撑多孔NiCo 2 O 4纳米片(NSs)。从结构上的优点中受益,这样形成的自由站立的核壳镍钴2 ö 4NSs @HfC纳米线/ CC在1 A g -1的电流密度下表现出2102 F g -1的高比电容,良好的倍率能力(20 A g -1时的电容保持率为85%)和出色的循环稳定性(5000后的电容保持率为98%)在10 A g -1下循环)。另外,组装有镍钴2 ö 4NSs @HfC纳米线/ CC和活性炭(AC)/ CC,柔性的固态混合超级电容器显示器53瓦公斤的高能量密度-1在800瓦kg的功率密度- 1,优异的性能稳定性和良好的柔韧性。更令人印象深刻的是,我们的工作不仅可以进一步扩大HfC NW的应用,也提出了合理构建高性能柔性超级电容器的新思路。

更新日期:2020-03-20
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