Journal
NANO-MICRO LETTERS
Volume 8, Issue 2, Pages 143-150Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-015-0069-x
Keywords
Co3O4@PPy; Core/shell nanosheet arrays; Supercapacitors
Funding
- National Natural Science Foundation of China [21171035, 51472049, 51302035]
- Chinese Ministry of Education [313015]
- PhD Programs Foundation of the Ministry of Education of China [20110075110008, 20130075120001]
- National 863 Program of China [2013AA031903]
- Science and Technology Commission of Shanghai Municipality [13ZR1451200]
- Fundamental Research Funds for the Central Universities
- Program Innovative Research Team in University [IRT1221]
- Shanghai Leading Academic Discipline Project [B603]
- Program of Introducing Talents of Discipline to Universities [111-2-04]
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Herein, combining solverthermal route and electrodeposition, we grew unique hybrid nanosheet arrays consisting of Co3O4 nanosheet as a core, PPy as a shell. Benefiting from the PPy as conducting polymer improving an electron transport rate as well as synergistic effects from such a core/shell structure, a hybrid electrode made of the Co3O4@PPy core/shell nanosheet arrays exhibits a large areal capacitance of 2.11 F cm(-2) at the current density of 2 mA cm(-2), a similar to 4-fold enhancement compared with the pristine Co3O4 electrode; furthermore, this hybrid electrode also displays good rate capability (similar to 65 % retention of the initial capacitance from 2 to 20 mA cm(-2)) and superior cycling performance (similar to 85.5 % capacitance retention after 5000 cycles). In addition, the equivalent series resistance value of the Co3O4@PPy hybrid electrode (0.238 Omega) is significantly lower than that of the pristine Co3O4 electrode (0.319 Omega). These results imply that the Co3O4@PPy hybrid composites have a potential for fabricating next-generation energy storage and conversion devices.
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