In the work, a novel lysine-assisted hydrothermal process is first developed to produce urchin-like ordered Co(OH) 2 arrays, which are assembled from mesoporous Co(OH) 2 nanowires. The synergistic contributions from lysine and Cl À ions to the formation of the unique arrays was also tentatively proposed. Electrochemical results show that the unique urchin-like ordered Co(OH) 2 arrays show the ability to deliver large specific capacitance and good electrochemical stability at large current densities, which is reasonably ascribed to their ordered microstructure, hierarchical (meso-and macro-) porosity and good electronic conductivity. Moreover, the method we proposed here provides a universal green chemistry approach to large-scale production of Co(OH) 2 and even other metal hydroxides oriented arrays with hierarchical porosity for fast energy storage.

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Ultra-high electrochemical reversible redox reactions for energy storage at high rates are realized from large-scale Co 3 O 4 nanoparticles growing on a nickel sheet pretreated with HNO 3 via a facile one-step hydrothermal strategy.