Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 52, Issue 50, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/ab4140
Keywords
ZnO/CoO; microsphere; self-assembly; hybrid supercapacitor
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Funding
- National Natural Science Foundation of China [51972153, 21607066]
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Hybrid supercapacitors (HSCs) are attractive in the field of energy storage systems, which can offer higher energy density than capacitors and higher power density than batteries. However, the battery-type electrodes in HSCs often suffer from low rate capability and cycling performance due to their poor electrical conductivity. Here, we demonstrated a positive battery-type electrode by using self-assembled flower-like microspheres (MSs). The MSs were composed of porous ZnO/CoO nanosheets. Compared with pristine CoO and ZnO electrodes, the ZnO/CoO composite electrode shows enhanced electrochemical performance with high specific capacity as well as high rate capability. A high capacity of 85 mAh g(-1) (similar to 681 F g(-1)) is achieved at a high current density of 20 A g(-1). Such a favorable performance can be attributed to the ZnO introduction, which improves the electrical conductivity of the electrode, and the porous structure with interconnected pores, which provides fast ion/electron transport. When assembled with activated carbon, the HSCs can deliver high energy density (23.8 Wh kg(-1)) and power density (1.3 kW kg(-1)).
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