Ni(OH)2与TiO2缺陷对可见光催化分解水过程的增效机制研究

光催化分解水过程被认为是解决环境和能源问题最有前景的手段之一。针对缺陷TiO2可见光吸收利用低以及光生载流子复合快等问题，本项目拟通过缺氧环境低温处理缺陷TiO2以引入二次表面缺陷，实现TiO2基材料可见光吸收范畴的拓展。研究缺氧环境以及处理条件对TiO2二次缺陷引入的影响；研究一次缺陷与二次缺陷两者对可见光拓展吸收、光生载流子分离之间的关系。通过TiO2表面引入廉价Ni(OH)2助催化剂以实现载流子分离效率的提高。研究影响Ni(OH)2和TiO2两组分高效耦合的内在因素；明确Ni(OH)2在粉末体系全分解水过程的功能；研究Ni(OH)2与TiO2的缺陷费米能级差与TiO2缺陷程度的关系；阐明两相费米能级差与TiO2光生空穴驱动力之间的关联；研究Ni(OH)2与TiO2缺陷对光生载流子高效分离的协同机制，并建立相关分子模型。本项目的实施对理解半导体缺陷与光催化过程具有一定的理论和实际意义。

The process of photocatalytic water splitting is considered to be one of the promising technology for achieving solar-chemical energy conversion. This project focuses on the defective TiO2 problems of absorption and utilization limitation of visible light and photogenerated carrier recombination, and then through the anoxic environment low temperature treatment for introducing secondary defect of TiO2 to expand its visible light absorption. Study on the effect of anoxic environment and the corresponding treatment conditions on the secondary defect introducing, building the relevance between primary and secondary defect and studying their effect on visible light absorption and photogenerated carrier separation. Introducing Ni(OH)2 on the TiO2 surface as the co-catalyst to improve the ability of TiO2 photogenerated carrier separation, study on the internal cause for the efficient coupling of Ni(OH)2 and TiO2, elucidating the function of Ni(OH)2 in the overall water splitting, Research on the relationship between the Fermi energy difference of Ni(OH)2 and TiO2 defect, making clear the function of Fermi energy difference on the driving force of the photogenerated holes, study on the synergy mechanism between Ni(OH)2 and TiO2 defect on the efficient water splitting and establishing the corresponding molecular model. This project will show the positive meaning on the understanding of semiconductor defects, photocatalysis and co-catalysts synergistic effect.