Hydrogen production from water electrolysis is severely restricted by the poor reaction kinetics of oxygen evolution reaction (OER). In this work, a series of two-dimensional (2D) composites MOF/Ti₃C₂T_x (the MXene phase) were fabricated by electrostatically directed assembly and used as catalysts for OER. The obtained composite materials exhibit enhanced electrocatalytic properties, thanks to the ultrathin 2D/2D heterostructure with abundant active sites in Co2Ni-MOF and the high electronic conductivity of Ti₃C₂T_x. Among all the catalysts, Co2Ni-MOF@MX-1 achieved the best oxygen evolution performance with the lowest Tafel slope (51.7 mV dec⁻¹) and the lowest overpotential (265 mV on carbon paper) at the current density of 10 mA cm⁻². These results demonstrated that the synthesis of 2D composite materials by electrostatically directed assembly could be a feasible and promising method for the preparation of 2D heterostructure catalysts.

析氧反应 (OER) 的不良反应动力学严重限制了电解水制氢。在这项工作中，一系列二维 (2D) 复合材料 MOF/Ti ₃ C _{2 Tx} （ MXene相）通过静电定向组装制造，并用作 OER 催化剂。由于 Co2Ni-MOF 中具有丰富活性位点的超薄 2D/2D 异质结构和 Ti ₃ C ₂ T _x的高电子电导率，所获得的复合材料表现出增强的电催化性能。在所有催化剂中，Co2Ni-MOF@MX-1 以最低的塔菲尔斜率 (51.7 mV dec ^{-1) 和在 10 mA cm -2}的电流密度下的最低过电势（复写纸上为 265 mV）。这些结果表明，通过静电定向组装合成二维复合材料可能是制备二维异质结构催化剂的一种可行且有前途的方法。