期刊论文

Experimental method to explore the adaptation degree of type-II and all-solid-state Z-scheme heterojunction structures in the same degradation system

Yu, Ying

英文

催化学报

0253-9837

2020

41

10

1522-1534

10.1016/S1872-2067(19)63495-9

(21573085 and 51872108):This work was supported by the National Natural Science Foundation of China (2018010401011294):the Wuhan Planning Project of Science and Technology (CCNU)from the college's basic research and operation through the Chinese Ministry of Education(CCNU18TS034):and the self-determined research funds of Central China Normal University (21573085,51872108):国家自然科学基金 (2018010401011294):武汉市应用基础前沿项目 (CCNU18TS034):华中师范大学中央高校基本科研业务费专项资金

本校为第一且通讯机构

TiO2 nanoparticles were prepared using the hydrothermal method and modified with C3N4 to synthesize a Type-II heterojunction semiconductor photocatalyst, TiO2-C3N4. In addition, a carbon layer was coated onto the TiO2 nanoparticles and the obtained material was uniformly covered on the surface of C3N4 to form an all-solid-state Z-scheme semiconductor photocatalyst, TiO2-C-C3N4. Through characterization by XRD, XPS, SEM, TEM, BET, photoelectrochemical experiments, UV-visible diffuse reflection, and PL spectroscopy, the charge transfer mechanism ...

随着光催化研究的深入开展,人们对复合催化剂的内部电子空穴转移路径产生了浓厚的兴趣,并提出几种相对合理的载流子迁移路径猜想.其中包括异质结构型(包括Type-I型异质结与Type-II型异质结)和Z-Scheme构型(包括直接Z-Scheme型异质结和间接Z-Scheme型异质结),解释了部分活性提升的机理.我们选取了全固态Z-Scheme异质结结构作为模型,制备出TiO_2-C-C_3N_4三元复合催化剂.全固态Z-Scheme异质结结构是指在两个带隙匹配的半导体之间引入导电材料,半导体之间不直接接触.在太阳光的激发下,导电材料两侧的半导体被同时激发,电子分别从两者的价带跃迁至导带,并在价带上留下空穴.由于两者之间存在电子导体...