| In recent years,the study of flexible energy storage devices is increasingly important as the rapid development of portable and wearable electronics.High energy and power density,outstanding flexibility and solid mechanical strength are indispensable for flexible energy storage devices.Supercapacitors possess characters of high power density,long cycle life,high safety and simple structure,which are excellent candidates for flexible applications.In this work,r GO film was selected as the flexible substrate of electrode,and then we pioneeringly employed layer Mo O3-x to composite with r GO to obtain the free-standing and binder-free r GO/Mo O3-x composite film as flexible electrode.Herein,Mo O3-x provides pseudocapacitance and r GO provides conductive network,the synergistic effect of Mo O3-x and r GO leads to excellent electrochemical performance.Firstly,Mo O3-x nanosheets were fabricated via solvothermal method.The Mo O3-x is composed of well-dispersed layered nanosheets.And r GO film was prepared by vacuum filtration method and HI reduction prosess.The film can still maintain good flexibility after HI reduction.Secondly,layered composite film with sandwich-like structure was prepared by layer-by-layer alternating vacuum filtration Mo O3-x and GO respectively.The areal specific capacitance of the layered composite film is 8972 m F?cm-2.Thirdly,the Mo O3-x powder was added into GO solution and the mixture was vacuum filtrated to produce r GO/Mo O3-x composite film.In this way,Mo O3-x was composited with r GO more uniformly.The as-prepared film electrodes exhibit an areal specific capacitance as high as 21300 m F?cm-2 and a galvanostatic capacitance of 1374 F?g-1at 0.1 A?g-1,which have been significantly larger compared with most recent reports.Excellent cycle stability has also been validated with nearly 100%capacitance retention even after 30,000 cycles.The electrochemical performance of r GO/Mo O3-x composite films remain stable even after continuous U-shape bending up to 10,000 times.Our strategy provides a convenient and versatile method for designing new flexible supercapacitors and is promising for portable and wearable electronics. |
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