The efficient conversion of carbon dioxide (CO₂) into useful chemicals has important practical significance for environmental protection. Until now, direct fixation of atmospheric CO₂ needs first extraction from the atmosphere, an energy-intensive process. Silicon (or Si-H surface), Earth-abundant, low-cost and non-toxic, is a promising material for heterogeneous CO₂ chemical fixation. Here we report one-step fixing of CO₂ directly from the atmosphere to a paraformaldehyde-like polymer by Si-H surface at room temperature. With the assistance of HF, commercial silicon powder was used as a heterogeneous reducing agent, for converting gaseous CO₂ to a polymer of fluorine substituted polyoxymethylene and hydroxyl substituted polyoxymethylene alternating copolymer (F-POM). Making use of the Si-H surface toward the fixation of atmospheric gaseous CO₂ is a conceptually distinct and commercially interesting strategy for making useful chemicals and environmental protection.

将二氧化碳（CO ₂）有效转化为有用的化学物质对环境保护具有重要的现实意义。迄今为止，大气中CO _2的直接固定需要首先从大气中抽出，这是一个耗能的过程。硅（或Si-H表面）是地球上丰富，低成本且无毒的材料，是用于异质CO ₂化学固定的有前途的材料。在这里，我们报告了在室温下通过Si-H表面直接将CO ₂从大气中一步固定到类聚甲醛的聚合物上的过程。在HF的辅助下，将市售硅粉用作非均相还原剂，用于转化气态CO ₂氟取代的聚甲醛和羟基取代的聚甲醛交替共聚物（F-POM）的聚合物。利用Si-H表面固定大气中的CO ₂是制造有用的化学药品和环境保护的概念上截然不同且在商业上令人关注的策略。