摘要
Z型光催化体系不仅能够提高光电分离效率,还能有效维持电荷载流子的氧化还原势.然而,该体系往往夹杂II型异质结,这对维持电荷载流子的氧化还原势不利.基于半导体的能带理论,构建了GaPO_(4)/Pt/Ga_(2)O_(3)复合催化剂,并对其结构、电荷传输和催化还原CO2性能进行研究.结果表明,该催化剂体系中光生电荷传输遵从Z型体系的方式,且II型异质结型的电荷传输方式被有效抑制.与Ga_(2)O_(3)、GaPO_(4)、GaPO_(4)/Ga_(2)O_(3)、Pt/Ga_(2)O_(3)相比,GaPO_(4)/Pt/Ga_(2)O_(3)光生电子-空穴的寿命明显延长,进而显著提高光催化还原CO2性能.其中,比纯Ga_(2)O_(3)提高了4.9倍.该研究为新型Z型体系的构建提供了参考.
Z-type photocatalytic system can not only improve the photoelectric separation efficiency,but also effectively maintain the redox potential of charge carriers.However,the system is often mixed with type II heterojunction,which is bad for maintaining the redox potential of charge carriers.In this study,GaPO_(4)/Pt/Ga_(2)O_(3) composite catalyst was constructed based on energy band theory,and its structure,charge transport and catalytic reduction performance of CO_(2) were studied.The results show that the photogenerated charge transport in the catalyst system conforms to the Z type system,and the II type heterojunction scheme charge transport is effectively inhibited.Compared with Ga_(2)O_(3),GaPO_(4),GaPO_(4)/Ga_(2)O_(3) and Pt/Ga_(2)O_(3),The lifetime of GaPO_(4)/Pt/Ga_(2)O_(3) photogenerated electron-hole is prolonged,and the performance of photocatalytic reduction of CO_(2) was significantly improved.Among them,it is 4.9 times higher than pure Ga_(2)O_(3).This study provides a reference for the construction of a new Z-scheme.
作者
赵杰
王婷
梁芯芯
屈妙
张泽星
ZHAO Jie;WANG Ting;LIANG Xin-xin;QU Miao;ZHANG Ze-xing(School of Environmental Science and Engineering, Shaanxi University of Science & Techology, Xi′an 710021, China)
出处
《陕西科技大学学报》
北大核心
2021年第4期66-72,89,共8页
Journal of Shaanxi University of Science & Technology
基金
陕西省科技厅自然科学基础研究计划项目(2021JM-281)
陕西科技大学预研基金项目(2017QNBJ-02)。
关键词
氧化镓
Z型体系
二氧化碳还原
gallium oxide
Z system
reduction of carbon dioxide
