Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 47, Pages 24918-24923Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm35485c
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Funding
- Chinese Academy of Sciences
- National Key Basic Research Program of China [2011CB935703]
- Shandong Province Funds for Distinguished Young Scientist [JQ200906]
- National Natural Science Foundation of China [20971077]
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A graphene nanosheet-titanium nitride (G-TiN) nanocomposite has been fabricated through a simple in situ hydrolysis method combined with ammonia annealing. TiN nanoparticles are homogeneously anchored on G, which is beneficial for the formation of a porous structure and the enhancement of electrical conductivity perpendicular to the graphene layers. Such a texture allows for the fast accessibility of ions and rapid transfer of electrons. In 1 M LiPF6-EC : DEC (vol. 1 : 1) electrolyte, the specific capacitances of the electrochemical capacitors (ECs) assembled without extra conductive agent addition, are 560 and 132 F g(-1) at current densities of 0.1 and 4 A g(-1), respectively. Meanwhile, high energy densities of 162 and 81 W h kg(-1) are obtained at power densities of 150 and 934 W kg(-1), respectively. Even at a higher power density of 4367 W kg(-1), a remarkable energy density of 41 W h kg(-1) is delivered. The unique characteristic of G-TiN endows the ECs with high energy density and power density, due to the combination of electric double layer capacitance and lithium ion intercalation capacitance.
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