부산대학교 도서관

It is fascinating yet challenging to assemble anisotropic nanowires into ordered architectures of high complexity and intriguing functions. We exploited a facile strategy involving oriented etching of a metal–organic fragment (MOF) to advance the rational design of highly ordered nanostructures. As a proof of concept, a microscale MIL-68(In) single crystal was etched with a K3[Co(CN)6] solution to give a microtube composed of aligned MIL-68(In) nanorods. Annealing such a MIL-68(In) microtube readily created an unprecedented branched In2O3mesocrystal by assembly of In2O3nanorods aligned in order. The derived ordered-In2O3–ZnIn2S4is more efficient in catalyzing visible-light-driven H2evolution (8753 μmol h–1g–1) outperforming the disordered-In2O3–ZnIn2S4counterpart (2700 μmol h–1g–1) as well as many other state-of-the-art ZnIn2S4-based photocatalysts. The ordered architecture significantly boosts the short-range electron transfer in an In2O3–ZnIn2S4heterojunction but has a negligible impact on the long-range electron transfer among In2O3mesocrystals. The density functional theory (DFT) calculation reveals that the oriented etching is achieved by the selective binding of the [Co(CN)6]3–etchant on the (110) plane of MIL-68(In), which can drag the In atoms out of the framework in order. Our findings could broaden the technical sense toward advanced photocatalyst design and impose scientific impacts on unveiling how ordered photosystems operate.