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Updated: May 4, 2026
CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
Published on: June 12, 2019
Carbon-source-dependent photocatalytic reduction pathways on polar chalcohalides: A comparative study of molecular
Yu-Yun Lin1, Chung-Shin Lu2, Tung-Hui Huang3
1Department of Science Education and Application, National Taichung University of Education, Taichung 403514, Taiwan.
Abstract:
Understanding how different C1 carbon sources participate in photocatalytic reduction is essential for clarifying carbon conversion pathways beyond conventional CO2-centric descriptions. Herein, polar chalcohalide photocatalysts SbSI and SbSeI are systematically investigated for the light-driven reduction of representative molecular and inorganic C1 carbon sources, including HCHO, HCOOH, CH3OH, NaHCO3, and CaCO3. Time-resolved product evolution, quantitative yields (μmol·g-1·h-1), and selectivity were determined using GC-TCD/FID and GC-MS. Across all systems, hydrogen evolution dominates the reaction network, methane is the primary carbon-containing product, and C2+ hydrocarbons appear as minor products, while CO and oxygen-containing organics are not detected. Molecular C1 substrates establish hydrogen-rich reaction environments that favor deep reduction and saturated hydrocarbon formation, whereas bicarbonate and carbonate sources exhibit reduced activity but enhanced formation of unsaturated C2+ hydrocarbons. These results establish a unified, experimentally driven framework for carbon-source-dependent photocatalytic reduction pathways over mixed-anion chalcohalide photocatalysts.
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