Mixed-phase composites derived from cobalt terephthalate as efficient battery-type electrodes for high-performance supercapattery

Interfacial engineering of two-dimensional(2D)monometallic phosphides enables remarkable structural and electrochemical properties in energy storage devices.Herein,2D nanosheets(NSs)of FeP_(2)/Co_(2) P were grown on Ni-foam(FCP)using a solution-based and phosphorization approach to be used as freestanding for high-performance energy storage devices.An effective phosphorization strategy is successfully de-veloped to improve the overall crystalline phase,tailor the morphology,and boost the electrochemical performances of electrodes.The FCP NSs electrode exhibits a battery-type redox behavior with a maxi-mum high areal capacity of 1.96 C cm^(-2) at 4 mA cm^(-2) in 6 M KOH aqueous electrolyte compared to the other counterparts.The superior electrochemical performance was achieved by increasing the electroac-tive sites and high conductivity via surface tailoring and fast redox reactions.Moreover,a supercapattery was assembled utilizing FCP and activated carbon(AC)electrodes and it revealed maximum specific en-ergy(E_(s))and specific power(P_(s))of 41.2 Wh kg^(-1) and 7578 W kg^(-1) with good cycling stability of 91%after 10,000 cycles at 5 A g^(-1).Eventually,the supercapattery has been explored in practical applications by lighting up light-emitting diodes(LEDs),representing the real-time performance of superior energy storage devices.

Preparation of metal‐organic frameworks and their derivatives for supercapacitors

To satisfy the requirements of social power development,it is urgently necessary to develop innovative and sustainable new energy storage devices.Supercapacitors have attracted considerable attention as a new type of energy storage device,owing to their high energy density,high power density,fast charging and discharging speeds,and long cycle life.The electrode material is an important factor in determining the electrochemical performance of supercapacitors.In recent years,researchers explored the application of metal‐organic frameworks(MOFs)and their derivatives as electrode materials for supercapacitors.In this paper,the preparation of monometallic,bimetallic,and conductive MOFs,and their derivatives for application in supercapacitors are reviewed.In addition,challenges facing MOFs in the field of supercapacitors and their future development prospects are discussed.