期刊
ACS NANO
卷 9, 期 1, 页码 481-487出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn505658u
关键词
porous carbon nanofiber; ultrathin graphite; flexible solid-state supercapacitor; device performance; chemical vapor deposition
类别
资金
- National Natural Science Foundation of China [51001080, 51272173, 51472177]
- Tianjin Research Program of Application Foundation and Advanced Technology [14JCYBJC20900, 14JCYBJC19600, 12ZCZDGX00800]
- Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT) of the Ministry of Education of China [IRT13084]
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 (similar to 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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