Abstract
Although the electrochemical water splitting is considered as one of the ideal hydrogen production methods, the high costs and low reserves of precious metals-based electrocatalysts severely hamper its large scale commercial application, which motivates the exploration and usage of high-efficiency non-precious metal electrocatalysts. Herein, we report a robust and controllable bottom-up strategy to fabricate a delicate two-dimensional porous nanoarchitecture constructed from iron-based metal-organic frameworks (MIL-100) and Ti3C2Tx MXene nanosheets (MIL/Ti3C2Tx) via an in situ solvothermal assembly process. The intercalated MIL-100 nanocrystals not only inhibit the interlayer restacking and agglomeration of Ti3C2Tx nanoflakes but also create a large number of interconnected pore channels for the adequate exposure of catalytic active sites, thus affording remarkable synergistic coupling effects. By the structural virtues of two-dimensional thin-sheet configuration, large specific surface area, high porosity, uniform MIL-100 dispersion, and exceptional electrical conductivity, the as-produced MIL/Ti3C2Tx nanoarchitecture exhibits enhanced electrocatalytic hydrogen evolution properties in terms of a low onset potential of 29 mV, an operating overpotential of 107 mV at 10 mA/cm2, a small Tafel slope of 61 mV/dec, and a long working life, all of which are significantly superior to those of bare MIL-100 and Ti3C2Tx electrocatalysts.
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