Dual heterojunction engineering on TiO 2 for spatial active-site decoupling toward efficient photocatalytic methane coupling

Dual-heterojunction TiO₂ separates holes (for C–H) and electrons (for O₂), enabling efficient photocatalytic methane coupling to C₂ hydrocarbons at 1.7 mmol g⁻¹ h⁻¹ (84% selectivity) with 45-hour stability.