Journal
JOURNAL OF POWER SOURCES
Volume 396, Issue -, Pages 632-638Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.06.070
Keywords
Selective vacuum filtration; Graphene hydrogel; Planar microsupercapacitor; Paper chip
Funding
- National Natural Science Foundation of China [21775049, 21475049, 31471257, 31700746]
- National Key R&D Program of China [2016YFF0100801]
- Fundamental Research Funds for the Central Universities, HUST [2017KFXKJC002]
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Graphene-based microsupercapacitors (mSCs) as important micro-power sources for miniaturized electronic devices have been a fascinating research topic. However, the large specific surface area of graphene is not fully exhibited due to the pi-pi stacking of graphene nanosheet in these graphene-based mSCs system fabricated by previously reported methods. Here, we propose a new method to fabricate the compact, flexible and all-solid-state graphene hydrogel-based mSC (GH-mSC) by combing paper chip with selective vacuum filtration, which allows the fabrication of mSCs with different sizes and shapes. The stack capacitance value of GH-mSC is 2.51 F cm(-3) and the CV curve still keep quasi-rectangular even at a very high scan rate of 50000 mV s(-1). The GH-mSC delivers acceptable energy densities of 0.223 mW h cm(-3) and power densities of 0.024 W cm(-3), which is better than electrolytic capacitor. Further, the GH-mSCs exhibit superior long-time cycling stability and good flexibility. More importantly, the mSC on paper chips allows easy scaling up of capacitance and output voltage by simply fabricating several mSCs on a plane or both sides of a paper and then connecting in parallel or series. These characteristics suggest that GH-mSCs are promising as power sources.
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