MXene Anchored with Platinum Cobalt Alloy as an Efficient and Stable Electrocatalyst for Hydrogen Evolution.

It is a great challenge to prepare efficient and stable electrocatalysts for hydrogen evolution (HER) using non-precious metals. In this study, a series of PtCo/TiCT-Y (Y: 16, 32, and 320, Y indicates the quality of Co(NO)) catalysts were synthesized by loading PtCo alloy on TiCT. The PtCo/TiCT-32 catalyst showed the best HER performance, reaching a current density of 10 mA cm with low overpotential (36 and 101 mV) and small Tafel slopes (66.37 and 105.17 mV dec) in 0.5 mol L HSO and 1 mol L KOH solution. The excellent HER activity of PtCo/TiCT-32 can be attributed as follows: TiCT has a unique two-dimensional structure, which can provide a large number of attachment sites for the PtCo alloy, hence exposing more active sites; on the other hand, it can also provide a fast and efficient conductive network for electron transport during electrocatalytic processes, thus enhancing the connectivity between electrolyte and catalyst. PtCo alloy makes the PtCo/TiCT catalyst more hydrophilic, accelerating the release rate of bubbles. The DFT calculation results showed that the energy barrier of HER is reduced because the charge around Pt is redistributed by Co after alloying Pt and Co, so that the PtCo/TiCT catalyst has a suitable ΔG value. This study can be expected to provide some references for the design and synthesis of TiCT-supported alloy electrocatalysts with high activity and stability for HER.