期刊
CHEMICAL ENGINEERING JOURNAL
卷 405, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126984
关键词
Supercapacitors; Ultrahigh energy density; Silver nanowire; PPy
资金
- National Natural Science Foundation of China [21773205, 51702281]
- Key R&D Program of Yunnan Province [2018BA068]
The designed coaxial hierarchical AgNW@Ni(OH)(2)@PPy electrode shows excellent specific capacitance and cyclic stability, leading to an all-solid-state asymmetric supercapacitor with ultrahigh energy density. The outstanding performance is attributed to the coaxial hierarchical design with innermost and outermost dual-electric channels.
Pseudocapacitive transition-metal oxides/hydroxides, due to their high theoretical capacity, are increasingly promising for supercapacitor electrodes. While, the most critical predicament involved is the inferior electrical conductivity that has lowered specific capacitance and further undermined the practical applications. To this end, we design a conductivity dual-enhanced structure, i.e. coaxial hierarchical AgNW@Ni(OH)(2)@PPy that the electrochemical active Ni(OH)(2) is grown on highly conductive Ag nanowires (AgNW) and further wrapped by a highly conductive polypyrrole layer (PPy). The designed AgNW@Ni(OH)(2)@PPy electrode demonstrates an outstanding specific capacitance (3103.5 F g(-1) at 2.6 A g(-1)) that can be retained in 92.2% after 20,000 charging/discharging cycles. The all-solid-state asymmetric supercapacitor (ASC) based on AgNW@Ni(OH)(2)@PPy is further fabricated and exhibits an ultrahigh energy density of about 121 Wh kg(-1) and excellent cyclic stability with 97.4% capacitance retention after 10,000 cycles. Finally, three ASCs in series that can achieve a high output voltage of 4.5 V, after charging for only 10 s, light up a LED light (0.03 W) over 2.5 h. The high performance is attributed to the coaxial hierarchical design with innermost and outermost dual-electric channels that not only ensure good conductivity and rapid charge transport, but also significantly improve the utilization efficiency of Ni(OH)(2).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据