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Novel Co 3 O 4  quasi-cubes with layered structure were obtained via two-step synthetic procedures. The precursors were initially prepared via hydrothermal reaction in the presence of egg albumin, and then the precursors were directly annealed at 300 °C in air to be converted into pure Co 3 O 4  powders. It was found that the size and morphology of final Co 3 O 4  products were greatly influenced by the amount of egg albumin and hydrothermal durations, respectively. Such layered Co 3 O 4  cubes possessed a mesoporous nature with a mean pore size of 5.58 nm and total specific surface area of 80.3 m 2 /g. A three-electrode system and 2 M of KOH aqueous electrolyte were employed to evaluate the electrochemical properties of these Co 3 O 4  cubes. The results indicated that a specific capacitance of 754 F g −1  at 1 A g −1  was achieved. In addition, the Co 3 O 4  cubes-modified electrode exhibited an excellent rate performance of 77% at 10 A g −1  and superior cycling durability with 86.7% capacitance retention during 4000 repeated charge-discharge process at 5 A g −1 . Such high electrochemical performances suggest that these mesoporous Co 3 O 4  quasi-cubes can serve as an important electrode material for the next-generation advanced supercapacitors in the future.

Egg Albumin-Assisted Hydrothermal Synthesis of Co3O4 Quasi-Cubes as Superior Electrode Material for Supercapacitors with Excellent Performances