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High potential and robust ternary LaFeO3/CdS/carbon quantum dots nanocomposite for photocatalytic H2 evolution under sunlight illumination
Journal of Colloid and Interface Science ( IF 9.9 ) Pub Date : 2020-09-15 , DOI: 10.1016/j.jcis.2020.08.125
Saikumar Manchala , Ambedkar Gandamalla , Navakoteswara Rao Vempuluru , Shankar Muthukonda Venkatakrishnan , Vishnu Shanker

Exploitation of the novel, robust, and advanced photocatalytic systems with high efficiency is the present demand for clean, green, and sustainable energy production. Carbon quantum dots (CQDs) have attracted tremendous interest in efficient H2 evolution from photocatalysis due to its remarkable visible-light harvesting and electron transport properties. Here, for the first time, a smart ternary nanocomposite comprises encapsulated CQDs with LaFeO3 spherical nanoparticles and CdS nanorods is synthesized by a simple hydrothermal procedure for the efficient photocatalytic H2 evolution under sunlight illumination. PXRD, FT-IR, FE-SEM, TEM, and XPS studies are performed to ensure the successful fabrication of ternary LaFeO3/CdS/CQD nanocomposite. The efficient H2 evolution rate (HER) of 25,302 μmol h−1 gcat−1 is achieved for LaFeO3/CdS/CQD nanocomposite, which is 602.4, 2.6, 29.8, 2.0 and 1.1 times higher than that of pristine LaFeO3, pristine CdS, and composites such as LaFeO3/CdS, LaFeO3/CQD, and CdS/CQD. Photocurrent and lifetime PL studies reveal, encapsulation of CQDs with the LaFeO3/CdS heterojunction can facilitate easy and efficient separation of photo-generated excitons. Altogether the fabrication of CQDs provides an ideal avenue for the development of high potential advanced photocatalytic systems for sustainable H2 production with remarkable efficiencies.



中文翻译:

高电位且坚固的三元LaFeO 3 / CdS /碳量子点纳米复合材料,在阳光照射下可光催化H 2的逸出

当前对清洁,绿色和可持续能源生产的需求是开发新颖,强大和先进的光催化系统。碳量子点(CQD)由于其显着的可见光收集和电子传输特性,对从光催化有效地释放H 2引起了极大的兴趣。在这里,智能三元纳米复合材料首次包含具有LaFeO 3球形纳米颗粒的封装CQD,并且通过简单的水热程序合成了CdS纳米棒,以在阳光照射下有效地光催化H 2释放。进行PXRD,FT-IR,FE-SEM,TEM和XPS研究以确保三元LaFeO 3的成功制备/ CdS / CQD纳米复合材料。LaFeO 3 / CdS / CQD纳米复合材料的有效H 2析出速率(HER)为25,302μmolh -1 g cat -1,比原始LaFeO 3分别高602.4、2.6、29.8、2.0和1.1倍,原始CdS,以及LaFeO 3 / CdS,LaFeO 3 / CQD和CdS / CQD等复合材料。光电流和寿命PL研究表明,用LaFeO 3 / CdS异质结封装CQD可以促进光生激子的简单有效分离。总而言之,CQD的制造为开发可持续的H的高潜力先进光催化系统提供了理想的途径。2生产效率显着。

更新日期:2020-09-29
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