Halide-Ion-Assisted Synthesis of Different α-Fe O Hollow Structures and Their Lithium-Ion Storage Properties.

Various α-Fe O hollow structures, such as wormlike shapes, ellipsoids, and quasicubes, were synthesized successfully by a halide-ion-assisted solvothermal method. The self-assembly assisted by selective absorption of halide ions and Ostwald ripening speeded up by acidic etching commonly determine the final unique structures. The electrochemical performance of the α-Fe O with different structures in reversible lithium-ion storage was investigated, and showed that the hollow Fe O quasicubes exhibit the best cycling performance with a charge capacity of 401.

Three-dimensional cobalt oxide microstructures with brush-like morphology via surfactant-dependent assembly.

In this study, three-dimensional cobalt oxide microstructures were developed. Cobalt oxide microdumbbells and microspheres, assembled by nanowires and primary particles, were successfully synthesized by a multistep hydrothermal method. Of all of the structures, the cobalt oxide microdumbbell electrode possesses the largest surface area of 70.

Graphene/NiO nanowires: controllable one-pot synthesis and enhanced pseudocapacitive behavior.

In this study, we report a facile and simple approach to synthesize a composite of mesoporous NiO nanowires and graphene nanosheets for supercapacitor applications. A Ni precursor was prepared by a one-pot sol-gel method in a water/ethylene glycol mixture containing a graphene oxide. Heat treatment in air was carried out to thermally reduce the graphene oxide to graphene and to convert the Ni precursor to NiO.