Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 32, Pages 16785-16790Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta02929e
Keywords
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Funding
- National Program on Key Basic Research Project of China (973 Program) [2014CB239701]
- National Natural Science Foundation of China [21173120, 51372116]
- Natural Science Foundations of Jiangsu Province [BK2011030]
- Funding for Outstanding Doctoral Dissertation in NUAA [BCXJ14-10]
- Jiangsu Innovation Program for Graduate Education [KYLX_0255]
- Fundamental Research Funds for the Central Universities
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Hybrid supercapacitors are a very appealing power source with high energy density and power density because they employ both the merits of lithium ion batteries and supercapacitors. To balance such hybrid systems, the rate of the redox component must be substantially comparative to the levels of the double layer process. As far as the insertion-host material TiNb2O7 is concerned, we have used facile step electrode design consisting of the physically assisted template infusion of Ti-Nb sol into the pores of AAO followed by in situ conversion into porous TiNb2O7 nanotubes within the AAO walls under calcination, and finally making those templates dissolve away. Using such an electrode as the battery type anode and a graphene grass electrode as the capacitor type cathode, we successfully constructed a novel hybrid supercapacitor. Within a voltage range of 0-3 V, a high energy density of similar to 74 W h kg(-1) is achieved and it could remain as much as similar to 34.5 W h kg(-1) at a power of 7500 W kg(-1). The present research sheds new light on the development of energy storage devices with both high energy density and high power density.
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