ZIF8@ZIF67-Derived MoSe₂/CoSe₂/ZnSe Hollow Nanospheres for Highly Efficient Hydrogen Evolution Reaction in Water...

Metal-organic frameworks (MOFs) have emerged as a versatile and tunable platform for creating coordinatively unsaturated single-metal sites within inorganic-organic hybrid porous materials. Notably, Co-, Ni-, and Zn-based metal-organic frameworks, characterized by their well-defined structures, extensive surface areas, and chemically and structurally homogeneous active sites, have gained prominence as critical electrode material candidates for electrochemical applications. The MoSe₂/CoSe₂/ZnSe composite material, featuring a nanosheet-coated hollow dodecahedral structure, was successfully synthesized via the hydrothermal method. The electrochemical performance of this catalyst was systematically evaluated in a 1 M KOH electrolyte. At a current density of 10 mA/cm², the composite catalyst exhibited superior catalytic activity, with a low hydrogen evolution overpotential of 72.8 mV and a Tafel slope of 31.85 mV/dec The capacitance of the double-layer capacitor (Cdl) is 88.94 mF/cm². Additionally, it demonstrated remarkable stability, maintaining consistent performance for 100 h under alkaline conditions. The formation of the heterostructure facilitated interface electronic regulation, significantly enhancing the number of active sites and the electrochemically active surface area of the catalyst. Moreover, the unique hollow structure effectively accelerated electron transfer and promoted the desorption of H* intermediates.