Zhuang Linzhou, Ge Lei, Liu Hongli, Jiang Zongrui, Jia Yi, Li Zhiheng, Yang Dongjiang, Hocking Rosalie K, Li Mengran, Zhang Longzhou, Wang Xin, Yao Xiangdong, Zhu Zhonghua
School of Chemical Engineering, The University of Queensland, Brisbane, 4072, Australia.
Centre for Future Materials, University of Southern Queensland, Springfield, 4300, Australia.
Angew Chem Int Ed Engl. 2019 Sep 16;58(38):13565-13572. doi: 10.1002/anie.201907600. Epub 2019 Aug 8.
Metal-organic framework (MOFs) two-dimensional (2D) nanosheets have many coordinatively unsaturated metal sites that act as active centres for catalysis. To date, limited numbers of 2D MOFs nanosheets can be obtained through top-down or bottom-up synthesis strategies. Herein, we report a 2D oxide sacrifice approach (2dOSA) to facilely synthesize ultrathin MOF-74 and BTC MOF nanosheets with a flexible combination of metal sites, which cannot be obtained through the delamination of their bulk counterparts (top-down) or the conventional solvothermal method (bottom-up). The ultrathin iron-cobalt MOF-74 nanosheets prepared are only 2.6 nm thick. The sample enriched with surface coordinatively unsaturated metal sites, exhibits a significantly higher oxygen evolution reaction reactivity than bulk FeCo MOF-74 particles and the state-of-the-art MOF catalyst. It is believed that this 2dOSA could provide a new and simple way to synthesize various ultrathin MOF nanosheets for wide applications.
金属有机框架（MOF）二维（2D）纳米片具有许多配位不饱和金属位点，这些位点可作为催化活性中心。到目前为止，通过自上而下或自下而上的合成策略只能获得数量有限的二维MOF纳米片。在此，我们报告了一种二维氧化物牺牲方法（2dOSA），可轻松合成具有灵活金属位点组合的超薄MOF-74和BTC MOF纳米片，而通过其本体对应物的分层（自上而下）或传统溶剂热法（自下而上）无法获得这些纳米片。制备的超薄铁钴MOF-74纳米片仅2.6纳米厚。富含表面配位不饱和金属位点的样品，其析氧反应活性明显高于块状FeCo MOF-74颗粒和最先进的MOF催化剂。据信，这种2dOSA可以提供一种新的简单方法来合成各种超薄MOF纳米片，以实现广泛应用。
