Co₃O₄ shows great effective and active on account of its weaker Co–O bond and higher oxygen binding rate. Co₃O₄ catalysts with different morphologies exhibit great difference in catalytic activity, which is closely related to their surface element composition, oxygen species and predominantly exposed crystal facets. Morphology and facet control have been proved to be effective routes to vary catalytic performances of Co based catalysts. In this work, three self-assembled Co₃O₄ nanospheres with different morphologies were successfully prepared by solvothermal and hydrothermal methods with different cobalt precursors without using any template, and were employed to the complete catalytical combustion of toluene. The best catalyst, H sample achieved a toluene conversion of 90 % at approximately 248 °C, which was 50 °C lower than that of the P sample. The superior catalytic performance of the H sample could be attributed to its higher Co³⁺ content, more adsorbed oxygen species and highly active {110} facets. More importantly, the H sample showed a stable activity for toluene catalytic combustion during 100 h test and displayed a good water resistance property, showing a great potential for practical applications.

Co ₃ O ₄由于其较弱的Co-O键和较高的氧结合率而显示出非常有效的活性。不同形态的Co ₃ O ₄催化剂在催化活性上有很大差异，这与它们的表面元素组成，氧种类和主要暴露的晶面密切相关。形态和刻面控制已被证明是改变Co基催化剂催化性能的有效途径。在这项工作中，三个自组装的Co ₃ O ₄在不使用任何模板的情况下，通过溶剂热和水热方法用不同的钴前体成功制备了具有不同形态的纳米球，并将其用于甲苯的完全催化燃烧。最好的催化剂H样品在约248°C时达到90％的甲苯转化率，比P样品低50°C。H样品的优异催化性能归因于其较高的Co ³⁺含量，更多的吸附氧种类和高活性{110}面。更重要的是，H样品在100 h试验中表现出对甲苯催化燃烧的稳定活性，并显示出良好的耐水性，在实际应用中显示出巨大的潜力。