In-situ grown nanocrystal TiO2 on 2D Ti3C2 nanosheets for artificial photosynthesis of chemical fuels

被引：139

作者：

Xu, Yanjie ^{[1
]}

Wang, Shuai ^{[2
]}

Yang, Jun ^{[2
]}

Han, Bo ^{[1
]}

Nie, Rong ^{[1
]}

Wang, Jixian ^{[1
]}

Wang, Jianguo ^{[3
]}

Jing, Huanwang ^{[1
,3
]}

机构：

[1] Lanzhou Univ, Coll Chem & Chem Engn, State Key Lab Appl Organ Chem, Lanzhou 730000, Gansu, Peoples R China

[2] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Gansu, Peoples R China

[3] Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Shanxi, Peoples R China

来源：

NANO ENERGY | 2018年 / 51卷

基金：

中国国家自然科学基金;

关键词：

Artificial photosynthesis; CO2; reduction; Chemical fuels; TiO2/Ti3C2; heterojunction; (CO2)-C-13 labeling experiments; SOLAR FUELS; PHOTOCATALYTIC ACTIVITY; GRAPHITIC CARBON; CO2; CONVERSION; ANATASE TIO2; WATER; REDUCTION; EFFICIENT; METHANOL; DIOXIDE;

D O I：

10.1016/j.nanoen.2018.06.086

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：

Artificial photosynthesis of high-valued chemicals is a promising route to alleviate global warming and energy crisis. Herein, a layered hybrid heterojunction of TiO2/Ti3C2 was synthesized by a facile hydrothermal oxidation method. The TiO2/Ti3C2 heterojunction was further functionalized by imine ligands and Pd nanoparticles, and used as a photocathode in CO2 reduction for the first time. These layered TiO2/Ti3C2 heterojunction materials have narrow band gap (2.1 eV), which contributes to the absorption of visible light. In the artificial photosynthetic cell of Pd/N-TiO2/Ti3C2 parallel to BiVO4, some hydrocarbon, such as formate, methanol and ethanol, were generated efficiently. The evolution rate of total hydrocarbon was as high as 73.6 mu M cm(-2) h(-1) (36.8 mM h(-1) g(-1)). The hydrogen gas can be evolved in the photoelectrocatalysis cell when the external voltage provided by Si solar cell is as low as - 0.4 V, due to the high activity of the heterojunction structure. The highest apparent light quantum efficiency of artificial photosynthesis cell was 1.78% at - 1.0 V. The carbon source of products was derived from CO2, which was verified by (CO2)-C-13 labeling experiments. The experimental results suggest that the in-situ formed TiO2/Ti3C2 heterojunction materials can be employed as candidates for efficiently photoelectrocatalytic reduction of CO2 to chemical fuels.

引用

页码：442 / 450

页数：9