封面图片说明:对于含有多种可变价态过渡金属元素的尖晶石氧化物,其组成和晶体构型相互制约,难以同时调控。通过“氧化沉淀-嵌入晶化”的新制备策略,可获得热力学亚稳态的立方CoMn2O4和四方MnCo2O4尖晶石相,为系统研究钴锰氧尖晶石的构效关系奠定基础。该制备方法所需反应温度较低,产物粒径小、分散度高,可实现尖晶石纳米晶与导电碳载体的原位负载,有利于电催化性能的发挥。详细介绍请参见本期第 Cover photo Description: For a variety of variable-value transition metal spinel oxides, the composition and the crystal structure of mutual constraints, it is difficult to regulate at the same time. The thermodynamically metastable cubic CoMn2O4 and tetragonal MnCo2O4 spinel phases can be obtained by a new preparation strategy of “oxidative precipitation-intercalating crystallization”, which lays the foundation for the systematic study on the structure-activity relationship of cobalt-manganese oxide spinel. The preparation method has the advantages of low reaction temperature, small product particle size and high dispersion, which can realize the in situ loading of the spinel nanocrystal and the conductive carbon carrier, which is favorable for the electrocatalytic performance. For details, please refer to this issue