Ultrafast Synthesis of Phosphorus‐Doped RuMoO x Electrocatalyst via Pulsed Joule Heating for Efficient Hydrogen Evolution

Developing efficient, low‐cost electrocatalysts for the hydrogen evolution reaction (HER) is crucial for sustainable hydrogen production through water electrolysis. Herein, we report a phosphorus‐doped ruthenium–molybdenum oxide catalyst supported on nickel foam (RuMoO x ‐P/NF) synthesized via two‐step immersing and rapid pulsed Joule heating. RuMo‐based nanoparticles are uniformly loaded on the NF substrate, and phosphorus doping could modulate the electronic properties of RuMoO x ‐P/NF. The obtained RuMoO x ‐P/NF exhibits exceptional HER performance in alkaline media, requiring low overpotentials of 16 and 70 mV to achieve current densities of 10 and 100 mA cm −2 , respectively—outperforming its undoped counterpart and commercial Pt/C. It also demonstrates outstanding stability with negligible activity loss after 100 h of operation. Various pH‐dependent experiments, cyclic voltammetry, and step current experiments demonstrate the strong hydrogen adsorption capacity of RuMoO x ‐P/NF catalyst, significantly accelerating the HER. The temperature‐controlled electrochemical experiments confirm lower HER activation energy of RuMoO x ‐P/NF than that of phosphorus‐free counterpart. This study offers a viable strategy for designing highly active and stable low‐precious‐metal HER electrocatalysts for sustainable hydrogen production.