Construction of Fe3O4@Fe2P Heterostructures as Electrode Materials for Supercapacitors

Considering their high abundance in the earth, iron-based materials have occasionally been regarded as promising electrode for supercapacitors. However, monometallic electrodes still demonstrate an insufficient specific capacitance value comparison to Mn-, Ni-, and Co-based compounds combined materials. Herein, enhanced heterostructure of Fe3O4@Fe2P was prepared via situ phosphorization Fe3O4. Compared pristine Fe3O4, showed a capacity enhancement KOH aqueous solution. The improved electrochemical performance can be attributed both core shell structure, which favors buffering collapse electrode, synergistic effect between two iron compounds, may provide abundant interfaces additional electrochemically active sites. Moreover, assembled asymmetric supercapacitor device using positive activated carbon negative delivers energy density 13.47 Wh kg−1, power 424.98 W acceptable retention 78.5% after 5000 cycles. These results clarify that Fe based deliver potential practical application. In addition, construction method developed here, different anion species are combined, represent strategy designing high-performance electrodes.