Engineering twin Cu_0.3Zn_0.7S for CO₂ photocatalytic reduction to ethylene

A twin Cu_0.3Zn_0.7S solid solution is developed for carbon dioxide photocatalytic reduction, in which ordered stacking faults induce homojunctions to enhance the separation and migration of photogenerated charge carriers. The high-coverage of the *CO intermediate is responsible for promoting C–C coupling. The developed photocatalyst exhibits efficient CO₂-to-C₂H₄ conversion with a C₂H₄ production rate of 8.45 μmol g⁻¹ h⁻¹ and an electron selectivity of 53.6%.