Guanine-Assisted Contrived Low Pt-Integrated MoC/C for Hydrogen Evolution Reaction.

Due to the high cost of the available Pt electrocatalysts, the large-scale water electrolysis production of hydrogen has been hindered. Hydrogen generation via electrochemical water splitting is a renewable energy essential to a sustainable society, creating a distinct material interface that shows Pt-like properties with long-term stability crucial to hydrogen evolution reactions (HERs). Here, we synthesized the guanine-assisted facile synthesis of 1 wt % Pt/MoC/C having a layered type morphology via solid state calcined process followed by chemical reduction. The well-developed 1 wt % Pt/MoC/C heterostructure is analyzed by inductively coupled plasma optical emission spectroscopy (ICP-OES) to understand the percentage of Pt doped on MoC/C. The as-synthesized 1 wt % Pt/MoC/C heterostructure exhibits a better HER activity than a commercial Pt/C with a small overpotential of 19 mV to reach a current density at 10 mA cm with a Tafel slope of 28 mV/dec. The catalyst 1 wt % Pt/MoC/C shows a long-term stability of 42 h in 0.5 M HSO. The layered sheet structure with the N-doped carbon (C) nanosheet, encapsulating well-dispersed Pt within the layers, significantly enhances the reaction kinetics of the 1 wt % Pt/MoC/C. This design creates a synergistic effect among MoC, Pt, and the carbon matrix, improving catalytic performance. Theoretical calculations using the density functional theory (DFT) indicate the active sites for hydrogen evolution on Pt-integrated MoC/C. The 1 wt % Pt/MoC/C possessed a significantly reduced Δ value (-0.06 eV) as compared to the pristine MoC/C material (Δ = 0.34 eV), suggesting a higher catalytic activity. This simple method offers a fresh means to make clearly defined carbides and sheds light on creating low-Pt catalysts for a scalable HER.