材料科学
纳米晶
异质结
人工光合作用
纳米技术
太阳能燃料
纳米复合材料
纳米颗粒
太阳能电池
热液循环
化学工程
带隙
光催化
催化作用
光电子学
有机化学
工程类
化学
作者
YP Xu,Shuai Wang,Jun Yang,Bo Han,Rong Nie,Jixian Wang,Jianguo Wang,Huanwang Jing
出处
期刊:Nano Energy
[Elsevier]
日期:2018-09-01
卷期号:51: 442-450
被引量:127
标识
DOI:10.1016/j.nanoen.2018.06.086
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||BiVO4, some hydrocarbon, such as formate, methanol and ethanol, were generated efficiently. The evolution rate of total hydrocarbon was as high as 73.6 μM 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 13CO2 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.
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