Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 43, Pages 18229-18235Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta04329d
Keywords
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Funding
- National Natural Science Foundation of China [51371106, 51171092]
- National Basic Program of China (973) [2012CB932800]
- Program for New Century Excellent Talents in University (MOE) [NCET-11-0318]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20120131110017]
- Young Tip-top Talent Support Project (the Organization Department of the Central Committee of the CPC)
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Nanostructured Cu oxides/hydroxides are promising materials for supercapacitors because of their high theoretical capacitance, low cost and friendliness to environment. However, the development of commercially viable Cu oxides/hydroxides with superior capacitive performance is still challenging. Here, 3D binder-free Cu2O@Cu nanoneedle arrays electrode was developed via facile electrochemistry. The electrode exhibits a high capacitance of 862.4 F g(-1) and excellent cycling stability (20 000 cycles). Furthermore, we have successfully constructed a Cu2O@ Cu//AC asymmetric supercapacitor, which can achieve an energy density of 35.6 W h kg(-1) at 0.9 kW kg(-1) and excellent stability with a capacitance retention of 92% after 10 000 cycles. After being charged for dozens of seconds, the in-series Cu2O@ Cu//AC supercapacitors can light up LED arrays and even charge a mobile phone. These fascinating performances reasonably indicate their potential in commercial applications for energy storage.
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