Enhanced photocatalytic N2 fixation via defective and fluoride modified TiO2 surface

被引：182

作者：

Guan, Renquan ^{[1
,2
]}

Wang, Dandan ^{[1
]}

Zhang, Yujun ^{[3
]}

Liu, Chen ^{[3
]}

Xu, Wei ^{[3
]}

Wang, Jiaou ^{[3
]}

Zhao, Zhao ^{[1
,2
]}

Feng, Ming ^{[1
]}

Shang, Qingkun ^{[2
]}

Sun, Zaicheng ^{[4
]}

机构：

[1] Jilin Normal Univ, Key Lab Funct Mat Phys & Chem, Minist Educ, Key Lab Preparat & Applicat Environm Friendly Mat, Changchun 130103, Peoples R China

[2] Northeast Normal Univ, Fac Chem, Changchun 130103, Peoples R China

[3] Chinese Acad Sci, Inst High Energy Phys, Yuquan Rd 19B, Beijing 100049, Peoples R China

[4] Beijing Univ Technol, Coll Environm & Energy Engn, Dept Chem & Chem Engn, Ctr Excellence Environm Safety & Biol Effects,Bei, 100 Pingleyuan, Beijing 100124, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2021年 / 282卷

基金：

中国国家自然科学基金;

关键词：

TiO2; Photocatalysis Oxygen vacancy; N-2; fixation; Hydrophobized; OXYGEN VACANCIES; S-VACANCIES; NITROGEN; REDUCTION; AMMONIA; WATER; PHOTOFIXATION; PERFORMANCE; NANOSHEETS; NH3;

D O I：

10.1016/j.apcatb.2020.119580

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Photocatalytic N-2 fixation (PNF) provides a low-cost route to generate ammonia. The poor conversion efficiency from photon to ammonia seriously hinders the step forward because of the low concentration of N-2 molecules. Herein, we demonstrate a photocatalyst with surface oxygen vacancies (Vo) and a F modified surface to facilitate N-2 adsorption and activation on the surface of catalysts. The Vo site promotes the chemical adsorption of N-2, electron transfer from catalyst to N-2. F modification switches the TiO2 surface properties from hydrophilic to aerophilic, thus facilitating the adsorption of N-2. Meanwhile, the hydrogen reduction reaction (HER) is sup-pressed, as protons hard to adsorb on F capped surfaces. The optimal NH3 production rate can reach 206 mu molh(-1)g(-1), which is similar to 9 times higher than that of pure TiO2 nanoparticles (similar to 23 mu molh(-1)g(-1)). This report provides a potential strategy to overcome mass transfer limitation and achieve a high conversion efficiency in PNF.

引用

页数：10

共 57 条

[1] Hierarchical hollow nanotubes of NiFeV-layered double hydroxides@CoVP heterostructures towards efficient, pH-universal electrocatalytical nitrogen reduction reaction to ammonia [J].