▎ 摘　　要

An ultrasmall Fe2O3 nanoparticle/three-dimensional hierarchical porous graphene-like (Fe2O3/3D HPG) composite has been synthesized by a facile hydrothermal method, which is investigated as a high performance electrode material for supercapacitors. In the composite, the ultra-small-sized Fe2O3 nanoparticles, with an average size of approximately 5 nm, are uniformly distributed on the 3D HPG substrate. The as-prepared Fe2O3/3D HPG composite electrode exhibits good electrochemical performance with a maximum specific capacitance of 967 Fg(-1) at 1.0 Ag-1 in the three-electrode system in 2.0 molL(-1) KOH aqueous solution, and an outstanding rate capability (74% capacitance retention at 30 Ag-1). In addition, the composite electrode also exhibits an excellent cycling performance with 92% capacitance retention of the initial capacity after 5000 cycles at 1.0 Ag-1 .