采用氢氟酸(HF)侵蚀钛碳化铝(Ti3AlC2)的方法制备了碳化钛(Ti3C2)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(CO2)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(TiO2-NTs)为光阳极的光催化燃料电池中进行CO2还原性测试。测试发现,经表面碱化的Ti3C2催化剂的CO2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 (Ti3C2) catalyst was prepared by hydrofluoric acid (HF) etching titanium aluminum carbide (Ti3AlC2),which was used as cathode catalyst for photocatalytic reduction of carbon dioxide (CO2) after alkalization of surface groups.The surface properties of cathode catalyst were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM).CO2 reducibility was tested in photocatalytic fuel cells with titanium dioxide nanotubes (TiO2-NTs) as photoanode.It was found that the reduction performance of Ti3C2 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.
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