Two-dimensional vanadyl phosphate ultrathin nanosheets for high energy density and flexible pseudocapacitors

Changzheng Wu, Xiuli Lu, Lele Peng, Kun Xu, Xu Peng, Jianliu Huang, Guihua Yu () and Yi Xie ()
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Changzheng Wu: Hefei National Laboratory of Physical Sciences at the Microscale, University of Science and Technology of China
Xiuli Lu: Hefei National Laboratory of Physical Sciences at the Microscale, University of Science and Technology of China
Lele Peng: The University of Texas at Austin
Kun Xu: Hefei National Laboratory of Physical Sciences at the Microscale, University of Science and Technology of China
Xu Peng: Hefei National Laboratory of Physical Sciences at the Microscale, University of Science and Technology of China
Jianliu Huang: Hefei National Laboratory of Physical Sciences at the Microscale, University of Science and Technology of China
Guihua Yu: The University of Texas at Austin
Yi Xie: Hefei National Laboratory of Physical Sciences at the Microscale, University of Science and Technology of China

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Two-dimensional materials have been an ideal material platform for constructing flexible ultrathin-film supercapacitors, offering great advantages of flexibility, ultra-thinness and even transparency. Exploring new two-dimensional pseudocapacitive materials with high electrochemical activity is needed to achieve flexible ultrathin-film supercapacitors with higher energy densities. Here we report an inorganic graphene analogue, α1-vanadyl phosphate ultrathin nanosheets with less than six atomic layers, as a promising material to construct a flexible ultrathin-film pseudocapacitor in all-solid-state. The material exhibits a high potential plateau of ~ 1.0 V in aqueous solutions, approaching the electrochemical potential window of water (1.23 V). The as-established flexible supercapacitor achieves a high redox potential (1.0 V) and a high areal capacitance of 8,360.5 μF cm−2, leading to a high energy density of 1.7 mWh cm−2 and a power density of 5.2 mW cm−2.

Date: 2013
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DOI: 10.1038/ncomms3431

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