Affiliation:
1. Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou Jiangsu 215123 P. R. China
2. Institut National de la Recherche Scientifique Centre Énergie Matériaux et Télécommunications 1650 Boul. Lionel Boulet Varennes Québec J3×1P7 Canada
3. Suzhou Institute for Advanced Research University of Science and Technology China Suzhou Jiangsu 215123 P. R. China
4. State Key Laboratory of Bio‐Fibers and Eco‐Textiles & College of Physics University‐Industry Joint Center for Ocean Observation and Broadband Communication Qingdao University No. 308 Ningxia Road Qingdao 266071 P. R. China
Abstract
AbstractColloidal quantum dots (QDs) are shown to be effective as light‐harvesting sensitizers of metal oxide semiconductor (MOS) photoelectrodes for photoelectrochemical (PEC) hydrogen (H2) generation. The CdSe/CdS core/shell architecture is widely studied due to their tunable absorption range and band alignment via engineering the size of each composition, leading to efficient carrier separation/transfer with proper core/shell band types. However, until now the effect of core size on the PEC performance along with tailoring the core/shell band alignment is not well understood. Here, by regulating four types of CdSe/CdS core/shell QDs with different core sizes (diameter of 2.8, 3.1, 3.5, and 4.8 nm) while the thickness of CdS shell remains the same (thickness of 2.0 ± 0.1 nm), the Type II, Quasi‐Type II, and Type I core/shell architecture are successfully formed. Among these, the optimized CdSe/CdS/TiO2 photoelectrode with core size of 3.5 nm can achieve the saturated photocurrent density (Jph) of 17.4 mA cm−2 under standard one sun irradiation. When such cores are further optimized by capping alloyed shells, the Jph can reach values of 22 mA cm2 which is among the best‐performed electrodes based on colloidal QDs.
Funder
Priority Academic Program Development of Jiangsu Higher Education Institutions
Higher Education Discipline Innovation Project
Natural Sciences and Engineering Research Council of Canada
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
4 articles.
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