Journal
NANO LETTERS
Volume 13, Issue 11, Pages 5408-5413Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl402969r
Keywords
2D layers; V2O5; 3D architectures; high energy density; supercapacitor
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Funding
- U.S. Army Research Office through a MURI grant [W911NF-11-1-0362]
- U.S. Department of Defense: U.S. Air Force Office of Scientific Research through a MURI grant [FA9550-12-1-0035]
- Singapore National Research Foundation under CREATE program: EMobility in Megacities
- Singapore National Research Foundation under CREATE program: A*STAR SERC [1021700144]
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Various two-dimensional (2D) materials have recently attracted great attention owing to their unique properties and wide application potential in electronics, catalysis, energy storage, and conversion. However, large-scale production of ultrathin sheets and functional nanosheets remains a scientific and engineering challenge. Here we demonstrate an efficient approach for large-scale production of V2O5 nanosheets having a thickness of 4 nm and utilization as building blocks for constructing 3D architectures via a freeze-drying process. The resulting highly flexible V2O5 structures possess a surface area of 133 m(2) g(-1), ultrathin walls, and multilevel pores. Such unique features are favorable for providing easy access of the electrolyte to the structure when they are used as a supercapacitor electrode, and they also provide a large electroactive surface that advantageous in energy storage applications. As a consequence, a high specific capacitance of 451 F g(-1) is achieved in a neutral aqueous Na2SO4 electrolyte as the 3D architectures are utilized for energy storage. Remarkably, the capacitance retention after 4000 cycles is more than 90%, and the energy density is up to 107 W.h.kg(-1) at a high power density of 9.4 kW kg(-1).
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