Fabrication of Planar Porous MXene/Carbon Composite Electrodes by Simultaneous Ammonization/Carbonization
(2.School of Materials Science and Engineering, University of Science and Technology of China, Hefei, China 230026)
【Abstract】As a new class of two-dimensional transition metal carbon/nitride, MXenes have been proven to be a kind of pseudocapacitive supercapacitor electrode material with excellent electrochemical property, and hold promise in practical use in the near future. In practical applications, it is required to make the electrode materials into planar porous electrodes for capacitor assembly. Herein, a simultaneous ammonization/carbonization method is proposed for the preparation of MXene planar porous electrode. With filter paper as the planar porous template, MXene was coated on the fibers of the filter paper by means of dipping-drying, followed by heat-treatment in an ammonia atmosphere. Finally, the MXene/carbon planar porous composite electrodes were obtained. Analysis results show that the MXene nanosheets are uniformly coated on the carbonization-derived carbon fibers of the filter paper. When the filter paper is immersed 5 times, the areal capacitance reaches 403 mF/cm2 at a scan rate of 2 mV/s. After the composite electrode is tested for 2 500 times in a galvanostatic charge–discharge cycle at a current density of 10 mA/cm2, the capacitance is almost the same as the initial capacitance, showing good rate performance and cyclic stability. The MXene/carbon planar porous composite electrodes prepared by simultaneous ammonia/carbonization exhibit excellent electrochemical performance without using either polymer binders or metal current collectors.
【Keywords】 MXene; supercapacitor; preparation;
(Translated by WANG YX)
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