电场诱导全固态Cu基光电极定向捕集-光电协同去除VOCs机制研究

针对光催化去除室内空气污染VOCs技术中存在的有毒中间产物规避难的应用瓶颈，搭建电容电场，以原位生长p-Cu2O纳米线阵列的三维Cu网为光电极，在其静电吸附极性VOCs分子的同时，电场诱导Cu2O能带弯曲，强化光生载流子的定向外迁。并耦合Ag纳米颗粒，实现催化界面上光生电子与空穴的空间异向分流。通过静电引力捕捉固定室内常见可挥发苯系物及有毒中间产物，实现VOCs高效-无次生污染氧化脱毒。明晰电极表面活性自由基定向聚集行为及催化活性增强机制，揭示有毒中间产物在催化界面被吸附固定-自由基氧化的动力学规律，探索VOCs高效快速、无次生污染的脱毒净化内在机理。本研究通过电场耦合同步实现VOCs的强化固定和氧化脱毒，建立低能耗、高效率去除有害物质的新策略，为陷入瓶颈期的光催化VOC降解提降解提供新思路、新方向。

Generating deleterious byproducts generally happens when photocatalytic technology is employed to degrade volatile organic chemicals (VOCs). In order to break through this application bottleneck, novel strategy using solid Cu-based photoanode will be proposed for the specific capture and highly efficient detoxication. .Three-dimentional Cu mesh with p-Cu2O nanowire arrays in-situ grown on can function as the photoanode. Assisted by an external electric field, the Cu2O/Cu will be charged and adsorb VOCs through static force, realizing the immobilization of the VOCs on photocatalytic interface. In addition, the band bending of Cu2O endowed by the electric field accelerates the migration of inside photoinduced carriers to Cu2O surface. Furthermore, depositing Ag nanoparticles on Cu2O interface to realize the spatial separation in different directions of the photogenerated electrons and holes. Since the VOCs and the corresponding deleterious byproducts can be tightly adsorbed on Cu2O/Ag interface through static force, they can be completely oxidized by the generated hydroxyl radicals without any toxic products exhausting. The orientated aggregation behaviors of active species on photocatalytic interface, and the causes for improved photocatalytic activity will be clarified. Detailed mechanism about the high efficient degradation of VOCs will be elucidated. A low energy consuming and high efficient strategy is going to be set up for the concomitant immobilization and detoxication of VOCs under the assistance of external electric fields. This research will supply new insight and new direction for the photocatalytic degradation of VOCs.