General Synthesis of Porous Mixed Metal Oxide Hollow Spheres with Enhanced Supercapacitive Properties.
Porous mixed metal oxide (MMO) hollow spheres present high specific surface areas, abundant electrochemically active sites, and outstanding electrochemical properties, showing potential applications in energy storage. A hydro/solvothermal process, followed by a calcination process, can be a viable method for producing uniform porous metal oxide hollow spheres. Unfortunately, this method usually involves harsh synthetic conditions such as high temperature and intricate processing. Herein, we report a general and facile "ion adsorption-annealing" approach for the fabrication of uniform porous MMO hollow spheres. The size and shell thickness of the as-obtained hollow spheres can be adjusted by the carbohydrate sphere templates and the solution concentration. Electrochemical measurements of the MMO hollow spheres demonstrate excellent supercapacitive properties, which may be due to the small size, ultrathin shells, and fine porous structure.
School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University , Xuzhou, Jiangsu 221116, China.|Institute for Superconducting & Electronic Materials, University of Wollongong , Wollongong, NSW 2522, Australia.
Qinghong
Q
Wang
School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University , Xuzhou, Jiangsu 221116, China.
Yuxuan
Y
Zhu
School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University , Xuzhou, Jiangsu 221116, China.
Jing
J
Xue
Hydrogen Energy Laboratory, School of Physics and Electronic Engineering, Jiangsu Normal University , Xuzhou, Jiangsu 221116, China.
Xinsheng
X
Zhao
Institute for Superconducting & Electronic Materials, University of Wollongong , Wollongong, NSW 2522, Australia.
Zaiping
Z
Guo
School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University , Xuzhou, Jiangsu 221116, China.
Chao
C
Wang
electrochemical properties; ion adsorption-annealing process; mixed metal oxides; porous hollow spheres; supercapacitor