纳米棒
量子点
材料科学
可见光谱
氮化碳
光电子学
异质结
光催化
分解水
纳米技术
化学
催化作用
生物化学
作者
Pawan Kumar,Ujwal Kumar Thakur,Kazi M. Alam,Piyush Kar,Ryan Kisslinger,Sheng Zeng,Sahil Patel,Karthik Shankar
出处
期刊:Carbon
[Elsevier]
日期:2018-10-01
卷期号:137: 174-187
被引量:72
标识
DOI:10.1016/j.carbon.2018.05.019
摘要
Graphenic semiconductors such as carbon nitride are attracting increasing attention as photocatalysts due to their chemical stability, visible light absorption and excellent electronic properties. The photocatalytic activity of nanostructured TiO2 catalysts is constrained by the wide bandgap and concomitant low visible light responsivity of TiO2. In this context we present the formation of new fluorine doped carbon nitride quantum dots (CNFQDs) by solid state reaction and the subsequent examination of their heterojunctions with TiO2 for photoelectrochemical water splitting. Arrays of rutile phase TiO2 nanorods embedded with CNFQDs were synthesized by a simple in situ hydrothermal approach and the resulting nanomaterials were found to exhibit strong visible light absorption. The energetics at the heterojunction were favorable for efficient electron transfer from CNFQDs to TiO2 under visible light irradiation and transfer of holes to the aqueous electrolyte. CNFQD-sensitized TiO2 nanorods exhibited a strong photoelectrochemical response up to 500 nm. Reuse experiments confirmed robustness and long term stability of the sample without exhausting the catalytic performance. The present work demonstrates a new pathway to sensitize TiO2 to visible photons by the in situ formation of embedded heterojunctions with fluorine doped carbon nitride quantum dots.
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