碳化硅与石墨烯复合材料的制备及其光催化还原CO2性能研究

项目名称： 碳化硅与石墨烯复合材料的制备及其光催化还原CO2性能研究

项目编号： No.21203233

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理化学

项目作者： 王英勇

作者单位： 中国科学院山西煤炭化学研究所

项目金额： 26万元

中文摘要： 光催化还原CO2是最具前景的CO2利用和转化方法之一。针对目前光催化还原CO2存在的转化效率低、催化剂稳定性差以及对可见光响应弱的问题，本项目拟采用碳化硅与石墨烯的复合材料为催化剂，研究其在可见光下催化还原CO2的活性和产物选择性。一方面碳化硅半导体材料本身具有高的稳定性、优良的光还原能力并对可见光响应，另一方面石墨烯的高比表面积和良好的电子传导率，使其能够吸附大量CO2，并通过快速传输载流子减少光生电子和空穴的复合几率，从而提高光催化效率。通过考察石墨烯的加入量及其与碳化硅材料间的复合方式、相互作用力等因素对光催化还原性能的影响，探讨光催化过程中石墨烯与碳化硅的协同作用机理，以及催化剂组成、结构及表面性能等与CO2光还原产物选择性之间的相互关系。

中文关键词： 碳化硅；复合物；光催化分解水；CO2还原；催化羰化偶联

英文摘要： Photocatalytic reduction of CO2 is one of the most potential routes of using and converting CO2. The lower efficiency and poor stability of catalysts are the major problems of the photoreduction of CO2 at present. The project will study the catalytic performance and the product selectivity of CO2 photoreduction using the composite of silicon carbide and graphene as the catalyst under visible light irradiation. On the one hand, SiC as a semiconductor are with high photoreduction ability and responsive to visible light; on the other hand, graphene could absorb mass of CO2, and fasten the transfer of electron and reduce the recombination of photogenerated holes and electrons due to its higher surface area and excellent electron conductivity. Therefore the composite could effectively improve the catalytic performance of the photoreduction of CO2. The effect of the addition of graphene and the interaction between SiC and graphene on the photoreduction performance of SiC based catalyst will be studied. The synergistic mechanism of SiC and graphene, and the correlation of catalyst's composition, structure and surface property with the product selectivity will be discussed in the project.

英文关键词： silicon carbide；composite；photocatalytic water splitting；reduction of CO2；Carbonylative coupling