Heterogeneous catalysts with precious metals supported on substrates are crucial for energy conversion and pollution control. Research focuses on improving catalyst performance by enhancing metal-support interactions. Ruthenium (Ru) shows promise for hydrogen evolution due to its activity and durability. However, achieving suitable hydrogen adsorption on Ru under alkaline conditions requires optimization. Titanium nitride (TiN) emerges as a promising support due to its unique properties. TiN-supported Ru nanoparticles (Ru NPs/TiN) exhibit excellent hydrogen evolution performance in alkaline conditions, surpassing commercial catalysts. Computational studies indicate TiN weakens hydrogen adsorption energies on Ru NPs, enhancing HER activity. The strong adhesion between Ru NPs and TiN promotes stability and prevents agglomeration at high current densities. An AEM electrolyzer with Ru NPs/TiN demonstrates stable operation for over 1000 hours at industrial current densities. This innovative catalyst design offers a cost-effective strategy for advanced hydrogen production with improved performance and stability.