材料科学
超级电容器
假电容器
纳米技术
石墨
碳纳米纤维
纳米纤维
集电器
欧姆接触
电容
碳纳米管
图层(电子)
复合材料
电极
电解质
化学
物理化学
作者
Kaiqiang Qin,Jianli Kang,Jiajun Li,Chunsheng Shi,Yuxiang Li,Zhijun Qiao,Naiqin Zhao
出处
期刊:ACS Nano
[American Chemical Society]
日期:2015-01-13
卷期号:9 (1): 481-487
被引量:99
摘要
A micrometer-thin solid-state supercapacitor (SC) was assembled using two pieces of porous carbon nanofibers/ultrathin graphite (pCNFs/G) hybrid films, which were one-step synthesized by chemical vapor deposition using copper foil supported Co catalyst. The continuously ultrathin graphite sheet (∼25 nm) is mechanically compliant to support the pCNFs even after etching the copper foil and thus can work as both current collector and support directly with nearly ignorable fraction in a SC stack. The pCNFs are seamlessly grown on the graphite sheet with an ohmic contact between the pCNFs and the graphite sheet. Thus, the accumulated electrons/ions can duly transport from the pCNFs to graphite (current collector), which results in a high rate performance. The maximum energy density and power density based on the whole device are up to 2.4 mWh cm–3 and 23 W cm–3, which are even orders higher than those of the most reported electric double-layer capacitors and pseudocapacitors. Moreover, the specific capacitance of the device has 96% retention after 5000 cycles and is nearly constant at various curvatures, suggesting its wide application potential in powering wearable/miniaturized electronics.
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