Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, PR China.
Chemistry. 2010 May 3;16(17):5215-21. doi: 10.1002/chem.200901632.
Cobalt ion-based coordination polymer nanowires were synthesized by using nitrilotriacetic acid (NA) as a chelating agent by a one-step hydrothermal approach. In the synthesis, cobalt ions were bonded with amino or carboxyl groups of NA to form one-dimension polymer nanowires, which can be confirmed by FTIR and TGA results. Our experimental results show that the morphologies of polymer nanowires greatly depend on the precursor salts, ratios between deionized water and isopropyl alcohol. The probable molecular formula and growth mechanism have been proposed. After heat treatment, the cobalt ion-based coordination polymer nanowires can be converted into porous Co(3)O(4) nanowires, which completely preserved the nanowire-like morphology. When used as anodes in lithium-ion batteries, the obtained porous Co(3)O(4) nanowires exhibited a high reversible capacity of 810 mA h g(-1) and stable cyclic retention at 30th cycle. The good electrochemical performance could be attributed to the porous nanostructure of Co(3)O(4), which provides pathways for easy accessibility of electrolytes and fast transportation of lithium ions.
钴离子基配位聚合物纳米线是通过一步水热法，使用氮三乙酸（NA）作为螯合剂合成的。在合成过程中，钴离子与 NA 的氨基或羧基结合形成一维聚合物纳米线，这可以通过 FTIR 和 TGA 结果得到证实。我们的实验结果表明，聚合物纳米线的形态极大地取决于前体盐、去离子水和异丙醇之间的比例。提出了可能的分子式和生长机制。热处理后，钴离子基配位聚合物纳米线可以转化为多孔 Co(3)O(4)纳米线，完全保持纳米线状形态。当用作锂离子电池的阳极时，所获得的多孔 Co(3)O(4)纳米线表现出 810 mA h g(-1)的高可逆容量和第 30 次循环的稳定循环保留率。良好的电化学性能可归因于 Co(3)O(4)的多孔纳米结构，它为电解质的易接近性和锂离子的快速传输提供了途径。
