Ying Ma,Ping Wei,Mengjie Chen,Xianhua Shi,Xiange Lu,Xuanxuan Zhang,Duanping Sun
A variety of two-dimensional (2D) metal–organic framework (MOF) nanosheets have been discovered with excellent peroxidase-like activity due to their merits of accessible active sites and large surface area. However, few methods can be used for the large-amount production of 2D MOF nanosheets. Herein, we report a simple room temperature solution phase method for the high-yield synthesis of 2D trimetallic MOF nanosheets with three kinds of metal ions as ligands. The as-synthesized NiCoM (M = Cu, Fe, and Zn) nanosheets showed markedly enhanced electrochemical activity due to the synergistic effect. Among these obtained nanosheets, NiCoFe showed the highest electrocatalytic activity, demonstrating that Fe played a dominant role in determining the activities of nanozymes. As a proof-of-concept application, 2D NiCoFe nanosheets are used as modified materials for the electrochemical detection of H 2 O 2 . The results showed that the fabricated sensor can detect hydrogen peroxide (H 2 O 2 ) with a detection range of 5.0 μM − 15 mM, a detection limit of 2.1 μM, excellent selectivity and stability. Moreover, the fabricated NiCoFe nanosheet-based electrochemical sensor can be used for the detection of H 2 O 2 in serum samples. Our work provides a scalable method for the large-scale synthesis of 2D trimetallic MOF nanosheets as enhanced nanozymes for various applications.
We used sodium hydroxide-mediated approach and tannic acid etching to prepare hollow structured trimetallic MOF-derived CoFeNi/Z-P NC nanocomposites. Remarkably, the resulting CoFeNi/Z-P NC nanocomposites have large specific surface area and mesoporous structure, making their active sites more accessible and mass transfer more effective. More complex trimetallic components provide greater possibilities for further improving electrocatalytic performance. The CoFeNi/Z-P NC nanocomposites demonstrate notable enhancements for the OER, and 10 mA cm−2 current density is achieved at a low overpotential of 244 mV, with a low Tafel slope of 66.2 mV dec−1 and have good stability in alkaline solutions. In addition, as a cathode material for overall alkaline water splitting, CoFeNi/Z-P NC is better than RuO2 with longer cycling stability.
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