Moss-like Ti3C2Tx based Fe/H2V3O8 composite as bifunctional electrode material for ammonium ion and zinc ion storage

The research on aqueous energy storage system is of significance due to its high security and economic friendliness. Herein, a moss-like Ti3C2Tx@Fe/H2V3O8 is synthesized by a simple hydrothermal method, in which Ti3C2Tx layers can act as scaffold to boost electric conductivity and suppress solution, H2V3O8 nanorods can expand electrode/electrolyte contact area and prevent aggregation, while Fe doping can optimize electric band structure effectively. Due to the cooperative effect of three components and distinctive structure, the Ti3C2Tx@Fe/H2V3O8 shows superior NH4+ storage capacity with superior capacity of 284.4 mAh g−1 at 0.5 A g−1 and high energy density of 48.64 mAh g−1 at power density of 166.9 W g−1. In addition, the Ti3C2Tx@Fe/H2V3O8 shows high capacity of 356 mAh g−1 at 0.1 A g−1 and stable long-cycling durability with outstanding capacity retention after 2000 cycles in Zn2+ storage application. The results reveal the great potential of Ti3C2Tx@Fe/H2V3O8 in aqueous ion battery application through rational structure design and synergistic effect of each component.