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利用简单的液相还原法,制备新型的花状和切角立方状Cu_2O光催化材料.通过TEM、XRD、XPS以及UVVis等对样品的形貌、晶型结构、表面化学特性以及吸光性能等进行表征.结果发现,不同实验条件下生成前驱体的不同以及Cu_2O纳米晶体各晶面{111}、{110}、{100}稳定性差异,对最终晶体的形貌演变起到关键的作用,初步得出粒子的形貌形成过程涉及种子颗粒团聚(seed-aggregation)以及表面重塑(surface-reconstruction)的生长机制.并对样品进行光解水产氢性能对比研究,结果表明,不同形貌的Cu_2O可见光催化活性及稳定性差异很大,花状Cu_2O独特的微观“针尖”结构具有“尖端催化”效应,导致氢气产率高达206.5μmol/h,是切角立方状Cu_2O的10倍以上,且循环4次后,产率降低2%左右,表现出极高的稳定性.
A new type of flower-shaped and chamfered cubic Cu_2O photocatalytic material was prepared by a simple liquid-phase reduction method.The morphology, crystal structure, surface chemical properties and absorbency of the samples were investigated by TEM, XRD, XPS and UVVis The results show that the different precursors and the differences in the {110} and {100} planes of {111}, {110} and {100} crystal planes of Cu 2 O nanocrystals play a key role in the morphological evolution of the final crystals, The results showed that the morphology of the particles involved in the seed-aggregation and surface-reconstruction mechanism of growth and the comparative study of the hydrogen production of photolysis water samples showed that different morphologies of Cu 2 O The catalytic activity and stability of visible light are very different. The unique microstructure of flower-like Cu 2 O has “tip catalysis ” effect, resulting in hydrogen yield as high as 206.5 μmol / h, which is 10 times that of cubic Cu_2O , And after 4 cycles, the yield was reduced by about 2%, showing extremely high stability.