CAJ | 학술논문

在乙醇和三乙胺的混合溶液中，采用溶剂热法制备了尺寸为10 nm的Co3O4立方体。考察了钴盐前驱体和溶解氧对Co3O4纳米立方体结构的影响规律，通过对合成过程中不同阶段产物的结构分析和表征，提出了Co3O4纳米立方体的形成机制是溶解再结晶的过程。将所制备的Co3O4纳米立方体在200°C焙烧处理后，尺寸和形貌均可保持稳定，但400°C焙烧后，变为球形纳米粒子。这种主要暴露{100}晶面的Co3O4纳米立方体催化CO氧化反应的活性低于纳米粒子({111}晶面)，验证了四氧化三钴纳米材料在CO氧化反应中的晶面效应。
재을순화삼을알적혼합용액중，채용용제열법제비료척촌위10 nm적Co3O4립방체。고찰료고염전구체화용해양대Co3O4납미립방체결구적영향규률，통과대합성과정중불동계단산물적결구분석화표정，제출료Co3O4납미립방체적형성궤제시용해재결정적과정。장소제비적Co3O4납미립방체재200°C배소처리후，척촌화형모균가보지은정，단400°C배소후，변위구형납미입자。저충주요폭로{100}정면적Co3O4납미립방체최화CO양화반응적활성저우납미입자({111}정면)，험증료사양화삼고납미재료재CO양화반응중적정면효응。
Co3O4 nanocubes that were exclusively terminated with{100}facets of edge size 10 nm were solvothermal y fabricated in a mixed solution of ethanol and triethylamine. Analyses of the structural evolution of the intermediates at different intervals during the synthesis, together with an examination of the influences of the cobalt precursor and solvent on the product structure, showed that the formation of Co3O4 nanocubes fol owed a dissolution-recrystal ization mechanism. After calcination at 200 ° C, the as-synthesized Co3O4 material retained a cubic morphology with the same edge size, but calcination at 400 ° C resulted in the formation of spherical Co3O4 particles of diameter about 13 nm. The Co3O4 nanocubes exhibited inferior activity in room-temperature CO oxidation compared with Co3O4 nanoparticles ({111}facets), primarily as a result of the exposure of the less-reactive {100} facets, demonstrating the morphology effect of Co3O4 nanomaterials.