超级电容器
材料科学
介孔材料
纳米片
电容
气凝胶
比表面积
纳米技术
多孔性
模板方法模式
无定形固体
电极
电解质
化学工程
复合材料
化学
催化作用
生物化学
有机化学
物理化学
工程类
作者
Xinhui Jin,Lirong Feng,Jiangcheng Zhang,Weizheng Yuan,Xiaohui Guo
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2023-12-05
卷期号:6 (24): 22837-22845
标识
DOI:10.1021/acsanm.3c04157
摘要
Hierarchically porous materials are promising electrode materials for supercapacitors due to their high surface area and large amounts of interconnected active sites. As a three-dimensional (3D) porous material, aerogels can further increase the exposure of active sites and improve the ion transport by constructing hierarchically porous structures. Herein, a kind of 3D hierarchically porous Ni(OH)2 aerogel (HP-NiA) constructed by a template-directed Ni(OH)2 nanosheet can be obtained via combining the sol–gel method and template-etching method, in which the controllable pore size was achieved via using the mesoporous silica-KIT-6 and silicon template KH570 as sacrificial templates. The microporous cavities are interconnected with mesopores and macropores, which enable full contact of active sites with electrolytes and facilitate quick transport of ions. Benefiting from the hierarchically porous structure and the high active specific surface area (1577.5 cm2), the amorphous HP-NiAs exhibit ultrahigh specific capacitance (5578 F/g at 1 A/g), excellent rate performance (3698 F/g at 20 A/g), and superior cycling stability (72.5% capacitance retention after 10,000 cycles), which are superior to the state-of-the-art supercapacitor electrode materials. This work highlights the importance of the rational design on the hierarchical structure and provides a feasible strategy to construct hierarchical porous materials for energy-storage applications.
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