| 多层多孔Co3O4纳米粒子组装体的合成、表征和电化学性能研究(英文) |
| Synthesis, Characterization and Electrochemical Properties of Multi-layered Porous Co3O4 Nanoparticle Assemblies |
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| 摘要: 利用十二烷基磺酸钠(SDS)作为表面活性剂，合成了形貌化的CoC2O4配合物前驱物，然后在500 ℃下热分解形貌化的前驱物，得到了多层多孔Co3O4纳米粒子组装体。采用FESEM、TEM、HRTEM、XRD、N2吸附脱附和Raman散射等手段对产物进行了分析和表征。低角XRD，TEM和N2吸附脱附测试表明所得组装体具有多孔结构。常规XRD、HRTEM和Raman结果证明组装体中Co3O4纳米粒子建筑块结晶较好。与体相Co3O4晶体相比，Co3O4纳米粒子组装体的5个拉曼活性峰发生了明显的红移。将Co3O4纳米粒子组装体作为锂离子电池的正极材料进行了电化学性能测试，结果表明该组装体电极的首次放电容量为1 115 mAh·g-1，远高于目前文献报道的Co3O4纳米管、纳米粒子和纳米棒电极。但是，该组装体电极的循环性能不好，有待进一步提高。 |
| 关键词: Co3O4 纳米粒子组装体 电化学性质 |
| 基金项目: |
| Abstract: Multi-layered Co3O4 nanoparticle assemblies with well arranged Co3O4 nanoparticles have been fabricated through thermal conversion of micelle-assisted shaped precursor. Low angle diffraction data, TEM images and nitrogen-adsorption studies show that the obtained assemblies are porous. Wide angle XRD, HRTEM and Raman analysis results exhibit that the Co3O4 nanoparticle building blocks are well crystallized. Corresponding Raman spectrum of the assemblies shifts toward low wave number region compared with that for bulk crystalline Co3O4. Electrochemical measurement results demonstrate that the obtained Co3O4 nanoparticle assemblies can be served as a good cathode material for lithium secondary batteries. The initial discharge capacity of the electrode made from Co3O4 nanoparticle assemblies is 1 115 mAh·g-1, which is much higher than that of the reported Co3O4 nanotubes, nanoparticles and nanorods electrodes. However, its cycling performance and stability are to be improved. |
| Keywords: Co3O4 nanoparticle assemblies electrochemical properties |
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| 韩 敏,张文莉,石乃恩,李景虹,徐 正.多层多孔Co3O4纳米粒子组装体的合成、表征和电化学性能研究(英文)[J].无机化学学报,2008,24(5):797-802. |
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