2012-08-012024-05-14https://scholars.lib.ntu.edu.tw/handle/123456789/658319摘要：太陽能是地球生物的終極能源，植物光合作用從古到今提供或儲存人類絕大多數使用的化石能源。光合作用的機制顯示，植物將CO2轉化葡萄糖是經過兩階段，光反應先分解水後釋放出O2，產生的氫再進行Calvin暗反應去還原CO2。因此本計畫目標也以兩階方式，光催化還原CO2成碳氫化合物燃料，先以光催化水分解分離O2產生H2，再以光催氫化CO2還原生成碳氫化合物燃料。本實驗室已執行以光觸媒進行光催化還原CO2生產碳氫化合物超過10年，近三年也開始光催化水分解反應，已經研發出在分解水的同時分開H2與O2的雙胞反應器。本計畫將模仿光合作用，進行光催化水分解同時CO2氫化還原成碳氫化合物燃料，研發高效率的光觸媒薄膜和光反應系統，開發太陽能直接轉成化學能的方法。預計以二年進行，第一年水分解光電化學法分離氫和氧+光催化氫化CO2，使用子計畫一發展的光觸媒薄膜，在雙胞光反應器將H2/O2分離，同時進行氫化CO2生成碳氫化合物。第二年模擬尾氣成份的CO2混合氣進行實際太陽光能的光催氫化反應，不須預先純化CO2，使用子計畫二發展的分離CO2中空纖維管束，將CO2分離擴散進入光反應器進行光催氫化反應，預期可類比甚至超過大自然的光合作用的光量子效率，比其他再生生質能源較具有經濟競爭力，貢獻於永續的再生能源發展。<br> Abstract: Solar energy is the ultimate energy source for all life in earth. The photosynthesis of plant provides most of the human energy now and stored energy as fossil fuel long time ago. The mechanism of photosynthesis indicates that the conversion of CO2 into glucose is by two steps. That is, O2 is released from water splitting in the light-reaction, and then the generated hydrogen is to hydrogenate CO2 in the Calvin cycle (dark-reaction). Thus the objective is to develop a two-step photocatalytic process to reduce CO2 into hydrocarbon fuel. H2 is produced and O2 is separated from the photocatalytic water splitting, then CO2 is hydrogenated into fuel. Our lab has carried out the photocatalytic CO2 reduction into hydrocarbon fuel for more than 10 years. Recently we also performed the photocatalytic water splitting into H2 and O2 using a twin photoreactor in which H2 and O2 can be simultaneously separated. This proposal imitates the photosynthesis to develop a two-step process of photocatalytic water splitting following CO2 hydrogenation into hydrocarbons. We will synthesize high-efficiency thin-film photocatalyst and design a photo reactor system. Thus the solar energy can be directly converted into chemical energy. This 2-year proposal will (1) perform photocatalytic H2O splitting and CO2 photo hydrogenation by photoelectrochemical method in the first year. Thin-film photocatalysts from the sub-project 1 will be used in the twin photoreactor to separate H2/O2 during water splitting. CO2 is photo hydrogenated into hydrocarbons; (2) simulated flue gas will be used to perform photocatalytic H2O splitting and CO2 photo hydrogenation by photoelectrochemical method under real sunlight in the second year. By the method, the pre-purification of CO2 is not required. A hollow-fiber device, which can separate CO2 from the sub-project 2, will integrate in the twin photoreactor. Thus CO2 is separately diffused and photo hydrogenated in the reactor. The result is expected to be comparable or even exceed the natural photosynthesis in term of quantum efficiency. This process will be economically competitive to other biomass methods. Such technique is a great contribution to sustainable energy.光催化水分解光催化氫化還原CO2人工光合作用再生能源photocatalytic water splittingphotocatalytic CO2 hydrogenationartificial photosynthesisrenewable energy