Synthesis of Mesoporous Single Crystal Co(OH)2 Nanoplate and Its Topotactic Conversion to Dual-Pore Mesoporous Single Crystal Co3O4
Synthesis of Mesoporous Single Crystal Co(OH)2 Nanoplate and Its Topotactic Conversion to Dual-Pore Mesoporous Single Crystal Co3O4
复制标题
介孔单晶Co(OH)(2)纳米片的合成及其拓扑转化为双孔介孔单晶Co3O4
DOI：
10.1021/acsami.6b02768
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发表时间：
2016-06-22
影响因子：
9.5
通讯作者：
Qu, Xuan-Hui
中科院分区：
文献类型：
--
作者：
Jia, Bao-Rui;Qin, Ming-Li;Qu, Xuan-Hui
采用软模板法合成了一类新型的介孔单晶材料Co（OH）（2）纳米片，并将其拓扑转化为双孔MSC Co 3 O 4。据报道，大多数来自软模板法的介孔材料是无定形或多晶的;然而，在我们的合成中，Co（OH）（2）种子生长形成单晶，两亲性嵌段共聚物F127胶体作为造孔剂。在Co（OH）（2）向Co 3 O 4的转化过程中，材料的单晶性质得以保持，并可得到特殊的双孔MSC Co 3 O 4纳米片。作为锂离子电池的阳极，这种双孔MSC Co 3 O 4纳米片具有极高的容量以及长循环性能（在第350次循环后在1A下为730 mAh g（-1））。其上级性能是由于其独特的分级介孔结构，可以显著改善Li+的扩散动力学，暴露的高活性（111）晶面有利于充放电循环中的转化反应。
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 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.