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利用溶胶凝胶法(Sol-gel)制备纯TiO_2(ST)及Ni掺杂TiO_2(NT)纳米薄膜,将其应用在光热化学循环(PTC)还原CO_2中进行机理研究,并与商用P25(PT)进行对比.结果表明利用NT进行CO_2还原,每个循环得到的平均CO产率最高为5.30μmol/g-cat,分别是利用ST与PT得到CO产率的3.13倍与2.28倍.利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线能量色散谱(EDXS)及X射线衍射技术(XRD)研究样品的物质组成、晶体结构与形貌.稳态与时间分辨固体光致发光光谱(PL)、紫外可见漫反射光谱(UV-vis DRS)和X射线光电子能谱(XPS)被用来进行材料光学性能及表面态检测,从而得到反应中激发电子转移机制.利用第一性原理计算研究材料表面氧空位形成能、态密度(DOS)及分态密度(PDOS).结合实验表征与理论计算,理清控制PTC反应进行的关键因子.
Pure TiO 2 (ST) and Ni-doped TiO 2 (NT) nanofilms were prepared by Sol-gel method and their mechanism was studied in the reduction of CO 2 by photothermal chemical cycle (PTC) PT) .The results showed that the average CO yield of each cycle was 5.30μmol / g-cat with NT for CO_2 reduction, which was 3.13 times and 2.28 times of that of the CO with ST and PT respectively. The composition, crystal structure and morphology of the samples were characterized by means of SEM, TEM, EDXS and XRD.The steady-state and time-resolved solid photoluminescence Spectroscopic (PL), UV-vis DRS and X-ray photoelectron spectroscopy (XPS) were used to investigate the optical properties and surface states of the materials to obtain the excited electron transfer mechanism in the reaction. Principle calculations Calculate the oxygen vacancy formation energy, DOS and PDOS on the surface of the material. Combining with the experimental characterization and theoretical calculation, the key factors controlling the PTC reaction were clarified.