化工新型材料

化工新型材料 ›› 2021, Vol. 49 ›› Issue (10) : 150-153. DOI: 10.19817/j.cnki.issn 1006-3536.2021.10.032

科学研究

改性碳化钛阴极的光催化系统还原CO₂研究

作者信息 +

CO₂ reduction in photocatalytic system with modified Ti₃C₂ cathode

Zhang Jun, Song Yawen, Lv Shuai, Zheng Jili, Yang Penglin

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文章历史 +

Received		Published
2020-06-21		2021-10-20
Issue Date	Revised Date
2021-11-02	2020-06-21

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摘要

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。

Abstract

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.

关键词

碳化钛 / 光催化二氧化碳还原 / 循环稳定性 / 疏水

Key words

Ti₃C₂ / photocatalytic CO₂ reduction / cycle stability / hydrophobicity

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改性碳化钛阴极的光催化系统还原CO₂研究[J]. 化工新型材料, 2021, 49(10): 150-153 DOI:10.19817/j.cnki.issn 1006-3536.2021.10.032

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