Co_(3)O_(4)在多相催化反应中的晶面效应

Crystal Facet Effect of Co_(3)O_(4)in Heterogeneous Catalytic Reaction

Co_(3)O_(4)是一种重要且性能优异的过渡金属氧化物,可以广泛应用于光、电、磁、热等多个领域,其晶体作为多相催化剂在众多反应中有着不可替代的地位。催化机理研究发现,催化反应过程不但受晶体催化剂颗粒尺寸的影响,而且对晶体的晶面也很敏感。因此,晶面效应的研究对于深入认识多相催化反应过程以及有效设计高活性催化剂都有重要意义。Co_(3)O_(4)晶体具有Co^(3+)和Co^(2+)混合价态的尖晶石结构,其在不同催化反应中均表现出明显的晶面效应。本文综述了近年来Co_(3)O_(4)作为多相晶体催化剂在热催化、光催化、电催化以及类过氧化物酶催化中的晶面效应,结合理论计算结果从Co_(3)O_(4)晶面的原子结构出发解释了产生晶面效应的原因;最后总结了Co_(3)O_(4)在以上反应中晶面效应的一般规律,探讨了目前Co_(3)O_(4)晶面效应研究中的不足,并对未来的发展趋势进行了展望。

As one of the important transition metal oxides,Co_(3)O_(4)possesses an excellent property,which leads to the fact that Co_(3)O_(4)is widely used in optical,electrical,magnetic,thermal and other fields.The crystals of Co_(3)O_(4)can be used as heterogeneous catalytic materials and thereby have an irreplaceable position in many reactions.With the continuous study of the catalytic mechanism,it is found that the catalytic reaction process is not only affected by the particle size of the crystal catalyst,but also is sensitive to the crystal facet.Therefore,the study on crystal facet effect of transition metal oxides is of great significance for the in-depth understanding of heterogeneous catalytic reactions and the effective design of high-active catalysts.Co_(3)O_(4)crystal has spinel structure with a mixed valence state of octahedral coordinated Co^(3+)and tetrahedral coordinated Co^(2+),and it shows the obvious crystal facet effect in different catalytic reactions.In this paper,the crystal facet effects of Co_(3)O_(4)as heterogeneous crystal catalyst in thermal catalysis,photocatalysis,electrocatalysis and peroxidase-like catalysis in recent years are systematically reviewed.In combination with theoretical calculations,the reasons of these crystal facet effects are explained from the atomic structure of different crystal facets of Co_(3)O_(4).Finally,the general law of crystal facet effect of Co_(3)O_(4)in the above reactions is summarized,the shortcomings in current study on Co_(3)O_(4)crystal facet effect are discussed,and the future development trend is reasonably prospected.