Abstract Using a novel flux method, a hexagonal plate of Co3O4 was directly synthesized. In this method, CoCl2·6H2O, NaOH, and the cosolvent H3BO3 were heated to 750 °C for 2 h in a corundum crucible. The products were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and high-resolution transmission electron microscope (HRTEM). Furthermore, XRD studies indicated that the product consisted of a cubic phase of Co3O4, and the phase existed in a completely crystalline form. Then, SEM results indicated that these hexagonal plates tiered up and they had diameters in the range of 2–10 µm. According to the results of SAED and HRTEM analyses, the interlayer spacing was about 0.24 nm, which corresponds to the interlayer distance of (3 1 1) crystal plane of cubic Co3O4.

中文翻译：

---

助熔剂法合成Co 3 O 4 六角板

摘要 采用一种新的助熔剂方法，直接合成了六边形的 Co3O4 板。在该方法中，将 CoCl2·6H2O、NaOH 和助溶剂 H3BO3 在刚玉坩埚中加热至 750 °C 2 小时。产物用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、选区电子衍射（SAED）和高分辨透射电子显微镜（HRTEM）进行表征。此外，XRD 研究表明该产品由 Co3O4 的立方相组成，并且该相以完全结晶的形式存在。然后，SEM 结果表明这些六边形板分层并且它们的直径在 2-10 µm 的范围内。根据 SAED 和 HRTEM 分析的结果，层间距约为 0.24 nm，