Synthesis of Mesoporous Single Crystal Co(OH)2 Nanoplate and Its Topotactic Conversion to Dual-Pore Mesoporous Single Crystal Co3O4

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• 作者：Bao-Rui Jia ; Ming-Li Qin ; Shu-Mei Li ; Zi-Li Zhang ; Hui-Feng Lu ; Peng-Qi Chen ; Hao-Yang Wu ; Xin Lu ; Lin Zhang ; Xuan-Hui Qu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：June 22, 2016
• 年：2016
• 卷：8
• 期：24
• 页码：15582-15590
• 全文大小：721K
• 年卷期：0
• ISSN：1944-8252

文摘

A new class of mesoporous single crystalline (MSC) material, Co(OH)₂ nanoplates, is synthesized by a soft template method, and it is topotactically converted to dual-pore MSC Co₃O₄. Most mesoporous materials derived from the soft template method are reported to be amorphous or polycrystallined; however, in our synthesis, Co(OH)₂ 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)₂ to Co₃O₄, and special dual-pore MSC Co₃O₄ nanoplates can be obtained. As the anode of lithium-ion batteries, such dual-pore MSC Co₃O₄ nanoplates possess exceedingly high capacity as well as long cyclic performance (730 mAh g^–1 at 1 A g^–1 after the 350th cycle). The superior performance is because of the unique hierarchical mesoporous structure, which could significantly improve Li⁺ diffusion kinetics, and the exposed highly active (111) crystal planes are in favor of the conversion reaction in the charge/discharge cycles.