Atomically dispersed ultralow-platinum loading on Ti3C2Tx MXene as efficient catalyst for hydrogen evolution reaction

The grand challenge in the development of Platinum (Pt)-based electrocatalytic hydrogen evolution reaction (HER) catalyst is their high-cost, low utilization and less controllable, limiting its wide application in hydrogen economy field. Therefore, exploring a new technique to construct catalyst require minimal amounts of Pt and maintain high performance is very necessary. Herein, we first designed a high-efficiency electrocatalyst based ultralow Pt loading (1.27 μg cm ‒2 ) on two-dimensional Ti 3 C 2 T x MXene support by controlling Cu monolayer underpotential deposition (UPD), and then galvanic replacement Cu monolayer with Pt. Due to the energetically favorable metal-support interaction, in acidic media the as-prepared Pt-Ti 3 C 2 T x MXene catalyst achieved a current density of 10 mA cm ‒2 at low overpotential of 30 mV. Furthermore, the Pt-Ti 3 C 2 T x MXene catalyst also exhibited a superior HER activity with high turnover frequency (TOF) of 41.8 s ‒1 and mass activity of 41.3 A mg Pt –1 , which were about nearly 47 times those of commercial 20 wt% Pt/C catalyst, respectively. This work demonstrate the potential of Ti 3 C 2 T x MXene as support for design of ultralow Pt loading electrocatalyst through Cu UPD-Galvanic replacement method that can be used for a wide range of catalytic reaction .