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孙靖宇教授课题组与刘忠范院士课题组的张力副教授合作在Advanced Materials上发表研究论文

发布者:金霞发布时间:2018-06-22浏览次数:82

题目:Caging Nb2O5 Nanowires in PECVD-Derived Graphene Capsules toward Bendable Sodium-Ion Hybrid Supercapacitors

  

作者:Xiangguo Wang1, Qiucheng Li1, Li Zhang,* Zhongli Hu, Lianghao Yu, Tao Jiang, Chen Lu, Chenglin Yan, Jingyu Sun,* and Zhongfan Liu

  

摘要:Sodium-ion hybrid supercapacitors (Na-HSCs) by virtue of synergizing the merits of batteries and supercapacitors have attracted considerable attention for high-energy and high-power energy-storage applications. Orthorhombic Nb2O5 (T-Nb2O5) has recently been recognized as a promising anode material for Na-HSCs due to its typical pseudocapacitive feature, but it suffers from intrinsically low electrical conductivity. Reasonably high electrochemical performance of T-Nb2O5-based electrodes could merely be gained to date when sufficient carbon content was introduced. In addition, flexible Na-HSC devices have scarcely been demonstrated by far. Herein, an in situ encapsulation strategy is devised to directly grow ultrathin graphene shells over T-Nb2O5 nanowires (denoted as Gr-Nb2O5 composites) by plasma-enhanced chemical vapor deposition, targeting a highly conductive anode material for Na-HSCs. The few-layered graphene capsules with ample topological defects would enable facile electron and sodium ion transport, guaranteeing rapid pseudocapacitive processes at the Nb2O5/electrolyte interface. The Na-HSC full-cell comprising a Gr-Nb2O5 anode and an activated carbon cathode delivers high energy/power densities (112.9 Wh kg−1/80.1 W kg−1 and 62.2 Wh kg−1/5330 W kg−1), outperforming those of recently reported Na-HSC counterparts. Proof-of-concept Na-HSC devices with favorable mechanical robustness manifest stable electrochemical performances under different bending conditions and after various bending-release cycles.

  

影响因子:19.791

  

原文链接:https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201800963