Researchers at the University of Texas at Austin in the US and the University of Science and Technology of China have developed a new graphene analogue called vanadyl phosphate, VOPO4. The 2D nanosheet can be combined with graphene itself to make a novel electrochemical electrode for use in high-performance, flexible and ultrathin-film solid-state pseudocapacitors. The flexible ultrathin-film pseudocapacitor Indeed, a prototype capacitor made from the hybrid electrode has a capacitance of as high as 8.4 mF/cm2, which leads to energy and power densities of 1.7 mWh/cm2 and 5.2 mW/cm2. These are the highest values ever achieved for such a device says team leader Guihua Yu. 2D nanomaterials could be ideal for making flexible, ultrathin-film supercapacitors. The new α1-vanadyl phosphate nanosheet, developed Yu and colleagues is less than six atoms thick and has a high electrochemical working window of around 1.0 V in aqueous solution. Yu’s team began by dispersing bulk VOPO4 in the solvent 2-propoanol. The researchers then mixed the two components together in an ultrasonic ice water bath for 15 minutes to form ultrathin VOPO4 nanosheets. After filtering, the nanosheets can easily be transferred onto a variety of substrates. High specific capacitance and redox voltage, and a long cycle life “We then made a flexible ultrathin pseudocapacitor on

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