改性碳化钛阴极的光催化系统还原CO_(2)研究  

CO_(2) reduction in photocatalytic system with modified Ti_(3)C_(2) cathode

作　　者：张军 宋亚文 吕帅 郑季历 杨朋林 Zhang Jun;Song Yawen;Lv Shuai;Zheng Jili;Yang Penglin(School of Energy and Power Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002)

机构地区：[1]郑州轻工业大学能源与动力工程学院,郑州450002

出　　处：《化工新型材料》2021年第10期150-153,158,共5页New Chemical Materials

基　　金：郑州轻工业学院博士启动基金(2015BSJJ001);低品位能源利用技术与系统重点实验室建设项目(LLEUTS-202015)。

摘　　要：采用氢氟酸(HF)侵蚀钛碳化铝(Ti_(3)AlC_(2))的方法制备了碳化钛(Ti_(3)C_(2))催化剂,对其进行表面基团碱化后,作为光催化还原二氧化碳(CO_(2))的阴极催化剂。采用X射线衍射(XRD)和扫描电子显微镜(SEM)对其表面进行表征。在以二氧化钛纳米管(TiO_(2)-NTs)为光阳极的光催化燃料电池中进行CO_(2)还原性测试。测试发现,经表面碱化的Ti_(3)C_(2)催化剂的CO_(2)还原性能明显提高,但由于大量H^(+)的存在导致循环稳定性较差。通过引入氟基疏水层来增强操作稳定性,该疏水层使得催化剂与水溶液的接触减少,抑制H^(+)对表面碱性基团的破坏,使系统能够高效稳定运行。Titanium carbide(Ti_(3)C_(2))catalyst was prepared by hydrofluoric acid(HF)etching titanium aluminum carbide(Ti_(3)AlC_(2)),which was used as cathode catalyst for photocatalytic reduction of carbon dioxide(CO_(2))after alkalization of surface groups.The surface properties of cathode catalyst were investigated by X-ray diffraction(XRD)and scanning electron microscope(SEM).CO_(2)reducibility was tested in photocatalytic fuel cells with titanium dioxide nanotubes(TiO_(2)-NTs)as photoanode.It was found that the reduction performance of Ti_(3)C_(2)catalyst after surface alkalization was significantly improved,but the cycle stability was poor due to the presence of a large amount of hydrogen ions(H^(+)).Operational stability was enhanced via the introduction of a fluorine-based hydrophobic layer,which reduced the contact between the catalyst and the aqueous solution,and inhibited the damage of H^(+) to the surface alkaline groups,and enabled the system to run smoothly.

关 键 词：碳化钛 光催化二氧化碳还原 循环稳定性 疏水 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]