期刊
ACS NANO
卷 7, 期 2, 页码 1464-1471出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn3052378
关键词
aerosol; aggregation; crumpling; graphene; loading level; scalability; ultracapacitor
类别
资金
- Initiative for Sustainability and Energy at Northwestern (ISEN)
- 3M
- Northwestern and the Northwestern University International Institute for Nanotechnology
- General Research Project of the Korea Institute of Geoscience and Mineral Resources (KIGAM)
- Ministry of Knowledge Economy of Korea
- National Research Council of Science & Technology (NST), Republic of Korea [13-530260] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Graphene is considered a promising ultracapacitor material toward high power and energy density because of its high conductivity and high surface area without pore tortuosity. However, the two-dimensional (2D) sheets tend to aggregate during the electrode fabrication process and align perpendicular to the flow direction of electrons and ions, which can reduce the available surface area and limit the electron and ion transport. This makes it hard to achieve scalable device performance as the loading level of the active material increases. Here, we report a strategy to solve these problems by transforming the 2D graphene sheet into a crumpled paper ball structure. Compared to flat or wrinkled sheets, the crumpled graphene balls can deliver much higher specific capacitance and better rate performance. More Importantly, devices made with crumpled graphene balls are significantly less dependent on the electrode mass loading. Performance of graphene-based ultracapacitors can be further enhanced by using flat graphene sheets as the binder for the crumpled graphene balls, thus eliminating the need for less active binder materials.
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