MOF-derived hierarchical double-shelled NiO/ZnO hollow spheres for high-performance supercapacitors.
Nanorods-composed yolk-shell bimetallic-organic frameworks microspheres are successfully synthesized by a one-step solvothermal method in the absence of any template or surfactant. Furthermore, hierarchical double-shelled NiO/ZnO hollow spheres are obtained by calcination of the bimetallic organic frameworks in air. The NiO/ZnO hollow spheres, as supercapacitor electrodes, exhibit high capacitance of 497 F g(-1) at the current density of 1.3 A g(-1) and present a superior cycling stability. The superior electrochemical performance is believed to come from the unique double-shelled NiO/ZnO hollow structures, which offer free space to accommodate the volume change during the ion insertion and desertion processes, as well as provide rich electroactive sites for the electrochemical reactions.
State Key Laboratory Base of Novel Functional Materials and Preparation Science, School of Materials Science & Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China.
Guo-Chang
GC
Li
Peng-Fei
PF
Liu
Rui
R
Liu
Minmin
M
Liu
Kai
K
Tao
Shuai-Ru
SR
Zhu
Meng-Ke
MK
Wu
Fei-Yan
FY
Yi
Lei
L
Han