Hydrogen (H
2) 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/Co
3O
4/Ti
3C
2T
x catalyst was synthesized by supporting Co/Co
3O
4 with Ti
3C
2T
x. The results show that Co/Co
3O
4/Ti
3C
2T
x 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/Co
3O
4/Ti
3C
2T
x can be explained as follows: Ti
3C
2T
x provides a stable skeleton and a large number of attachment sites for Co/Co
3O
4, thus exposing more active sites; the unique two-dimensional structure of Ti
3C
2T
x provides an efficient conductive network for rapid electron transfer between the electrolyte and the catalyst during electrocatalysis; Co
3O
4 makes the Co/Co
3O
4/Ti
3C
2T
x catalyst more hydrophilic, which can accelerate the release rate of bubbles; Co/Co
3O
4 can accelerate the adsorption and deionization of H
2O to synthesize H
2. This study provides a new approach for the design and preparation of low-cost and high-performance HER catalysts.
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