文摘
A new class of mesoporous single crystalline (MSC) material, Co(OH)<sub>2sub> nanoplates, is synthesized by a soft template method, and it is topotactically converted to dual-pore MSC Co<sub>3sub>O<sub>4sub>. Most mesoporous materials derived from the soft template method are reported to be amorphous or polycrystallined; however, in our synthesis, Co(OH)<sub>2sub> seeds grow to form single crystals, with amphiphilic block copolymer F127 colloids as the pore producer. The single-crystalline nature of material can be kept during the conversion from Co(OH)<sub>2sub> to Co<sub>3sub>O<sub>4sub>, and special dual-pore MSC Co<sub>3sub>O<sub>4sub> nanoplates can be obtained. As the anode of lithium-ion batteries, such dual-pore MSC Co<sub>3sub>O<sub>4sub> nanoplates possess exceedingly high capacity as well as long cyclic performance (730 mAh g<sup>–1sup> at 1 A g<sup>–1sup> after the 350th cycle). The superior performance is because of the unique hierarchical mesoporous structure, which could significantly improve Li<sup>+sup> diffusion kinetics, and the exposed highly active (111) crystal planes are in favor of the conversion reaction in the charge/discharge cycles.