title: Novel and facile method, dynamic self-assemble, to prepare SnO₂/rGO droplet aerogel with complex morphologies and their application in supercapacitors.
abstract: A facile and novel method to prepare SnO2/reduced graphene oxide (rGO) droplet aerogels with complex morphologies had been developed. This method has been named dynamic self-assemble. Aerogels with both "egg-tart" and "mushroom" shapes were obtained by this method. The changes in the graphene oxide (GO) droplet morphologies during the dynamic process of a GO droplet falling into a SnCl2 target solution were monitored using a high speed camera. The formed SnO2/rGO aerogels were then characterized by Raman spectroscopy, thermogravimetric analysis, X-ray diffraction analysis, and X-ray photoelectron spectroscopy. The microstructures of the SnO2/rGO aerogels were observed with scanning electron microscopy and transmission electron microscopy. Finally, the SnO2/rGO droplet aerogels were used as the electrode material in a symmetrical two-electrode supercapacitor and the electrochemical performance of the supercapacitor was investigated using cyclic voltammetry and galvanostatic charge/discharge methods. The SnO2/rGO electrodes demonstrated excellent electrochemical performance and stability. At a scan rate of 5 mV/s, their highest gravimetric and volumetric specific capacitances were 310 F/g and 180 F/cm(3), respectively, and their energy and power densities were as high as 30 Wh·kg(-1) and 8.3 kW·kg(-1), respectively.
authors.affiliation: School of Science, Tianjin University , Tianjin 300072, People's Republic of China.
authors.forename: Mingxi
authors.initials: M
authors.lastname: Chen
authors.forename: Huan
authors.initials: H
authors.lastname: Wang
authors.forename: Lingzhi
authors.initials: L
authors.lastname: Li
authors.forename: Zhe
authors.initials: Z
authors.lastname: Zhang
authors.forename: Cong
authors.initials: C
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Jianping
authors.initials: J
authors.lastname: Gao