Researchers at China University of Petroleum Beijing have developed a zinc-doped CuInS2 photocatalyst that converts CO2 into ethylene using visible light. The catalyst uses sulfur vacancies and dual Cu-Zn active sites to improve charge separation and C-C bond formation, key steps in producing ethylene from CO2. Published in the Chinese Journal of Catalysis, the work shows a pathway to turn a greenhouse gas into a valuable chemical feedstock. Ethylene is a building block for plastics and industrial chemicals. Current production relies on fossil fuels. This photocatalytic approach could lower the carbon footprint of ethylene manufacturing if it scales. The team used in situ spectroscopy and density functional theory to confirm the reaction mechanism. The catalyst operates under visible light, which makes up most of the solar spectrum. The study is at the lab scale. No cost or durability data is reported yet. Scaling photocatalytic CO2 reduction to industrial volumes remains a major challenge. But the design principles here, defect engineering and dual-site coordination, offer a clear direction for further research.
