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Hydrogen (H₂) is considered to be the best carbon-free energy carrier that can replace fossil fuels because of its high energy density and the advantages of not producing greenhouse gases and air pollutants. As a green and sustainable method for hydrogen production, the electrochemical hydrogen evolution reaction (HER) has received widespread attention. Currently, it is a great challenge to prepare economically stable electrocatalysts for the HER using non-precious metals. In this study, a Co/Co₃O₄/Ti₃C₂T<i>_x</i> catalyst was synthesized by supporting Co/Co₃O₄ with Ti₃C₂T<i>_x</i>. The results show that Co/Co₃O₄/Ti₃C₂T<i>_x</i> has excellent HER activity and durability in 1 mol L⁻¹ KOH, and the overpotential and Tafel slope at 10 mA·cm⁻² were 87 mV and 61.90 mV dec⁻¹, respectively. The excellent HER activity and stability of Co/Co₃O₄/Ti₃C₂T<i>_x</i> can be explained as follows: Ti₃C₂T<i>_x</i> provides a stable skeleton and a large number of attachment sites for Co/Co₃O₄, thus exposing more active sites; the unique two-dimensional structure of Ti₃C₂T<i>_x</i> provides an efficient conductive network for rapid electron transfer between the electrolyte and the catalyst during electrocatalysis; Co₃O₄ makes the Co/Co₃O₄/Ti₃C₂T<i>_x</i> catalyst more hydrophilic, which can accelerate the release rate of bubbles; Co/Co₃O₄ can accelerate the adsorption and deionization of H₂O to synthesize H₂. This study provides a new approach for the design and preparation of low-cost and high-performance HER catalysts.