Abstract Porous ZnCo2O4 nanosheets (NSs) were synthesized via a solvothermal method in ethylene glycol (EG) and water combined solvent, and followed by calcination in air at 400 °C for 2 h. No surfactant or template was employed during the entire synthetic process. The ZnCo2O4 NSs have a thickness of about 100–150 nm, and possess a BET surface area and pore size of 54.4 m2 g−1 and 7.8 nm, respectively. Such porous NSs would gradually stack into quasi-cube-like microstructures with reaction time prolonging. Quasi-cubes with edge length ranging from 10 to 30 μm were produced, and NSs almost disappeared after 15 h of solvothermal treatment. It was found that the volume ratio of EG to water played important role for the final shapes of ZnCo2O4. Some irregular and broken NSs were formed if less amount of EG was used, while quasi-microcubes stacked by NSs were dominant in the product as the ratio of EG to water increased to 4:1. The current approach is simple and low cost, and can be extended for preparation of other transition metal oxides in nanoscaled size and porous structure.

中文翻译：

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通过简单的溶剂热途径无模板合成介孔 ZnCo 2 O 4 纳米片和准立方体

摘要 在乙二醇 (EG) 和水的混合溶剂中，通过溶剂热法合成多孔 ZnCo2O4 纳米片 (NSs)，然后在空气中在 400 °C 下煅烧 2 h。在整个合成过程中没有使用表面活性剂或模板。ZnCo2O4 NSs 的厚度约为 100-150 nm，BET 表面积和孔径分别为 54.4 m2 g-1 和 7.8 nm。随着反应时间的延长，这种多孔 NS 会逐渐堆积成准立方体状的微观结构。制备出边长范围为 10 至 30 μm 的准立方体，溶剂热处理 15 小时后 NSs 几乎消失。发现 EG 与水的体积比对 ZnCo2O4 的最终形状起着重要作用。如果使用较少量的EG，则会形成一些不规则和破碎的NS，而随着EG与水的比例增加到4:1，由NSs堆叠的准微立方体在产品中占主导地位。目前的方法简单、成本低，可扩展用于制备其他纳米尺寸和多孔结构的过渡金属氧化物。