Phospho-doped FeCo2O4 Electrode Material for Asymmetric Supercapacitors
Phosphorus-doped FeCo2O4 nanowire (P-FeCo2O4-x) electrode materials were grown in situ on flexible carbon cloth using simple hydrothermal and low-temperature phosphorylation methods,and the effects of various phosphorus source additions on the morphology and properties of P-FeCo2O4-x were investigated.The results showed that the prepared P-FeCo2O4-x-2 electrode materials had uniform and rough morphology and excellent electrochemical properties at a current density of 5 mA/cm2 with a specific capacitance of 3643 mF/cm2 and a capacity retention rate of 85.9％ after 5000 charge/discharge cycles at current of 20 mA/cm2.The performance enhancement is mainly attributed to the doping of phosphorus into the spinel structure,which replaces some of the oxygen atoms and forms oxygen vacancies,increasing the degree of defects,while improving the electronic structure and increasing the conductivity.Being assembled into a flexible asymmetric supercapacitor,the positive pole is P-FeCo2O4-x-2 material,and the negative pole is activated carbon (AC).The capacitor exhibits an excellent energy density of 40.9 Wh/kg at a power density of 747.4 W/kg.In addition,after 2000 charge-discharge cycles,the capacity retention rate remains stable at 82.1％,even at a current density of 5 A/g.
SupercapacitorPhosphorus-dopedCobalt acid ironNanowiresHigh energy density
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