光催化
材料科学
量子点
纳米棒
磷化铟
表面光电压
硫化镉
X射线光电子能谱
磷化物
可见光谱
带隙
光致发光
纳米技术
铟
化学工程
光电子学
催化作用
光谱学
化学
金属
有机化学
工程类
冶金
物理
砷化镓
量子力学
作者
H. Khai,D. Praveen Kumar,A. Putta Rangappa,Young Ho Hong,D. Amaranatha Reddy,Tae Kyu Kim
出处
期刊:Chemcatchem
[Wiley]
日期:2020-08-12
卷期号:12 (18): 4550-4557
被引量:20
标识
DOI:10.1002/cctc.202000616
摘要
Photocatalytic conversion of CO2 into storable fuels is an attractive way to simultaneously address worldwide energy demands and environmental problems. Semiconductor quantum dots (QDs) have gained prominence as candidates for photocatalytic applications due to their many advantages, which include tunability for advanced electronic, optical, and surface properties. Indium phosphide (InP) quantum dots are semiconducting QDs with enormous potential for solar-driven CO2 reduction. Their advantages include a tunable bandgap, diverse surface chemistry, and nontoxicity. InP QDs and CdS nanorods were integrated using a simple and inexpensive method. CO2 photoreduction by the CdS-InP composites was evaluated in aqueous solution using triethanolamine as a sacrificial donor. The crystal structures, surface compositions, and morphologies were investigated via X-ray diffraction analysis, X-ray photoelectron spectroscopy, and transmission electron microscopy, respectively. The UV-visible diffuse reflectance spectra of the CdS-InP composites indicated efficient visible light utilization in the 500–550 nm range. The results of photoelectrochemical and photoluminescence analyses illustrated effective charge separation in the composites. The photocatalytic activity of the as-synthesized composites was superior to that of pure CdS. The CO evolution rate of the optimized composite was 216 μmol h−1 g−1 during the first three hours of irradiation and increased steadily over the next 62 hours. We also studied the influences of different solvents, the hole scavenger concentration, and catalyst loading on the performance of the optimized composite.
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