Nature Communications, Published online: 09 June 2026; doi:10.1038/s41467-026-74321-4 Unclear hydrogenation mechanisms in nitrate-to-ammonia electrosynthesis hampers its performance at industrial current densities. Here, the authors report RuCo alloys to steer the reaction along the Langmuir-Hinshelwood pathway, maintaining 1000 h stability at 1 A cm−2 with ~100% Faradaic efficiency.