▎ 摘　　要

Here, a controllable ZFO/rGO hybrid is prepared with high SCs performance by controlling the ZFO particle size and ZFO mass ratio. Small ZFO nanoparticles (similar to 15 nm) can be fully utilized and facilitated fast ion transport during electrochemical reactions, whereas the high mass ratio of ZFO (82.3%) will improve the specific capacitance of the ZFO/rGO hybrid electrode. The specific capacitance of this hybrid reach 352.9 F g(-1) at current densities of 1 A g(-1), which is higher or comparable to other ZFO based electrodes. It also exhibits remarkable cyclic stability (92.3% retention after 10000 cycles) and good rate performance. In addition, the energy density of symmetric supercapacitor based on ZFO/rGO hybrid can reach 6.7 Wh kg(-1) at a power density of 300 W kg(-1) within a voltage of 1.2 V in a 2M KOH aqueous electrolyte. (c) 2018 Elsevier Ltd. All rights reserved.