Low-temperature exfoliated graphenes: vacuum-promoted exfoliation and electrochemical energy storage.
A preheated high-temperature environment is believed to be critical for a chemical-exfoliation-based production of graphenes starting from graphite oxide, a belief that is based on not only experimental but also theoretical viewpoints. A novel exfoliation approach is reported in this study, and the exfoliation process is realized at a very low temperature, which is far below the proposed critical exfoliation temperature, by introducing a high vacuum to the exfoliation process. Owing to unique surface chemistry, low-temperature exfoliated graphenes demonstrate an excellent energy storage performance, and the electrochemical capacitance is much higher than that of the high-temperature exfoliated ones. The low-temperature exfoliation approach presents us with a possibility for a mass production of graphenes at low cost and great potentials in energy storage applications of graphene-based materials.
Lv
Wei
W
Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China.
Tang
Dai-Ming
DM
He
Yan-Bing
YB
You
Cong-Hui
CH
Shi
Zhi-Qiang
ZQ
Chen
Xue-Cheng
XC
Chen
Cheng-Meng
CM
Hou
Peng-Xiang
PX
Liu
Chang
C
Yang
Quan-Hong
QH