Breaking the Chlorine and Oxygen Evolution Scaling Relation via the Selective Shielding Effect of Oxophilic Ti Sites

Abstract

To overcome the selectivity-stability trade-offs in acidic chlor-alkali electrolysis, we develop Co3O4/TiO2 core-shell nanowires. The oxophilic TiO2 shell creates a "shielding effect" that blocks H2O access to Co3O4, effectively decoupling chlorine and oxygen evolution. This architecture shows a remarkably low overpotential (310 mV) and long-term stability, presenting a powerful paradigm for selective electrocatalyst design.