Developing highly efficient Pt‐based catalysts through interface engineering is significant for hydrogen production by water electrolysis working at pH‐universal conditions but still challenging. Herein, a PtCo@PtSn heterojunction with good hydrogen evolution reaction (HER) performance in pH‐universal electrolytes is designed and prepared by combining the advantages of a Pt‐based bimetallic alloy and heterojunction. Density functional theory simulations illustrate that the surface electronic structure of Pt is optimized by interface engineering to effectively improve the ability of water dissociation and decrease the PtH bond strength for obtaining the suitable H* Gibbs free energy (∆GH*). It shows low HER overpotentials in 1.0 m KOH (η−10 = 25 mV), 1.0 m phosphate‐buffered saline (η−10 = 18 mV), and 0.5 m H2SO4 (η−10 = 21 mV) solutions, respectively, and it can steadily work for 100 000 (100k) cycles by cyclic voltammetry method. Thus, this work provides a novel strategy to design Pt‐based hydrogen evolution catalyst with robust catalytic performance.

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The PtNi alloy exhibits excellent catalytic activity for oxygen reduction. However, particle agglomeration and support corrosion during the electrochemical reaction inevitably decrease its catalytic stability. Herein, we synthesize PtNi anchored on MoO x (PtNi-MoO x /NC) catalysts by pyrolysis treatment and the ethylene glycol method. It exhibits better catalytic stability than the commercial Pt/C and the prepared PtNiMo ternary catalysts. After the 30k cycle accelerated degradation test, the catalytic activity attenuations for PtNi−MoO 3 /NC and PtNi−MoO 2 /NC are 17 and 24%, respectively, which are lower than that of the commercial Pt/C (59%) and the prepared PtNiMo/NC (70%). The stability enhancement can be attributed to the strong metal−support interactions that effectively restrain the aggregation and shedding of PtNi nanoparticles. This work provides a promising strategy to improve the catalytic stability by introducing insoluble metal oxides as support materials for oxygen reduction reaction.