American Chemical Society
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Dimensional Impact of Metal–Organic Frameworks in Catalyzing Photoinduced Hydrogen Evolution and Cyanosilylation Reactions

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journal contribution
posted on 2018-12-03, 00:00 authored by Jian Wang, Jian Zhang, Shing Bo Peh, Linzhi Zhai, Yunpan Ying, Guoliang Liu, Youdong Cheng, Dan Zhao
Metal–organic frameworks (MOFs) have been widely studied as heterogeneous catalysts. Compared to the MOFs with three-dimensional (3D) topologies, two-dimensional (2D) MOF nanosheets can allow facile access to the active sites on their external surface, thus having huge potentials in catalysis. Herein, we fabricate 2D MOF nanosheets, UiO-67-NS, as photocatalyst for H2 evolution reaction, and study their photocatalytic performance in relation to their 3D bulk counterparts (UiO-67). The UiO-67-NS exhibit an 84-fold increase in photocatalytic efficiency compared to UiO-67. Postsynthetic cation grafting of the UiO-67-NS with titanium leads to further enhancement in photocatalytic efficiency, giving a hydrogen evolution rate of up to 393 μmol g–1 h–1, which is 13-times higher than that of the nongrafting nanosheets under the same condition. Our results indicate that the 3D-to-2D dimensionality reduction can be a viable strategy for the development of MOFs as efficient photocatalysts. In addition, we have demonstrated that the improvement of catalytic performance based on the strategy of 3D-to-2D framework dimensionality reduction can be easily extended to heterogeneous cyanosilylation reaction.