Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 26, Pages 10090-10097Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta01489h
Keywords
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Funding
- National Natural Science Foundation of China [21171035, 51302035]
- Key Grant Project of 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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Design and fabrication of high performance pseudocapacitors from 3D hierarchical hybrid electrodes with large areal capacitance and excellent rate capability still remains a challenge. Here, 3D hierarchical hybrid mesoporous NiCo2O4@COxNi1-x(OH)(2) core-shell nanosheet arrays on Ni foam have been rationally designed and facilely synthesized via an electrodeposited routine for pseudocapacitor applications. Electrochemical measurements show that the NiCo2O4@Co0.33Ni0.67(OH)(2) electrode material exhibits a large areal capacitance as high as 5.71 F cm(-2) at a current density of similar to 5.5 mA cm(-2), as a result of our high mass loading up to similar to 5.5 mg cm(-2). Moreover, it exhibits an excellent rate capability (similar to 83.7% capacitance retention at 273 mA cm(-2)). Based on these excellent properties, an asymmetric supercapacitor based on 3D hierarchical hybrid mesoporous NiCo2O4@Co0.33Ni0.67(OH)(2) nanosheet arrays as the positive electrode and CMK-3 as the negative electrode was successfully fabricated. The as-fabricated device achieved the maximum areal capacitance of 887.5 mF cm(-2) (specific capacitance of 87.9 F g(-1)) at 5 mA cm(-2) with a stable operational voltage of 1.6 V and a high energy density of 31.2 W h kg(-1) at a power density of 396 W kg(-1). Moreover, two asymmetric supercapacitors in series could power 5 mm diameter red round light-emitting diode (LED) indicators efficiently for more than 5 minutes. The present 3D hierarchical hybrid material electrode with remarkable electrochemical properties has significant potential applications in high energy density storage systems.
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