Professor Gong Xiu, Professor Zhang Wenhua, JMCA Research: Construction of a full zero-dimensional CsPbBr3/CdSe heterojunction to achieve efficient photocatalytic reduction Carbon dioxide
【Article Information】
Constructing a full zero-dimensional CsPbBr3/CdSe heterojunction to achieve efficient photocatalytic reduction of carbon dioxide
First author: Yin Guilin
First author: Yin Guilin
First author: Yin Guilin
1 Corresponding authors: Gong Xiu*, Wang Qinglong*, Zhang Wenhua*
Unit: Guizhou University , Henan University , Yunnan University
[Research background]
Since the 21st century, the excessive use of fossil fuels has caused serious energy crisis and environmental problems. Using solar energy to convert carbon dioxide (CO2) into valuable clean energy is considered one of the most promising strategies to solve energy crises and environmental problems (reduce CO2 concentration). However, rapid carrier recombination and low catalyst activity are the main challenges of photocatalytic carbon dioxide reduction (CO2RR).
CsPbBr3 is a typical halide perovskite material. Due to its excellent light emission range, high photoluminescence quantum yield and tunable bandgap, it has aroused important scientific interest in the field of photoelectric applications. CsPbBr3 has become a potential candidate material for high-efficiency photocatalysis. However, in CO2RR, the catalytic activity of CsPbBr3 quantum dots alone gradually decreases due to charge recombination, lack of active sites and insufficient stability. In previous studies, the use of a variety of catalysts combined with CsPbBr3 quantum dots made up for its own shortcomings, thereby further improving catalytic performance and stability.
This work constructs an 0D/0D heterojunction by growing CdSe quantum dots in situ at CsPbBr3 quantum dots. The unique 0D/0D structure shortens the migration path of photogenerated charges and provides rich active sites through quantum dots edge/angle sites. CsPbBr3 coordinates with narrow band gap CdSe to construct a fully OD structure type II heterojunction, effectively enhancing light capture, exciton generation and carbon dioxide activation. More importantly, the strong interface interaction between CdSe and CsPbBr3 through the strong interface interaction between Pb-Se and Cd-Br bonds significantly improves the charge transfer and structural stability between CsPbBr3/CdSe, thereby greatly improving the catalytic performance and stability.
[Article Introduction]
Recently, Professor Gong Xiu from Guizhou University cooperated with Professor Wang Qinglong from Henan University and Professor Zhang Wenhua from Yunnan University to publish the title " on the internationally renowned journal Journal of Materials Chemistry A"Constructing all Zero-dimensional CsPbBr3/CdSe Heterojunction for Highly Efficient Photocatalytic CO2 Reduction” paper. This article constructs an OD/0D heterojunction by growing CdSe quantum dots in situ at CsPbBr3 quantum dots. The unique OD/0D structure shortens the migration path of photogenerated charges and provides a rich active site. Without the use of the sacrificial agent , CsPbBr3/CdSe exhibits excellent CO2RR performance, about 4.6 times that of CsPbBr3. Through theoretical calculations and experiments, it can be seen that the interaction between Pb-Se and Cd-Br bonds between CdSe and CsPbBr3 is conducive to the separation of charge and the adsorption of CO2.
Fig. 1. Mechanism diagram of photocatalytic reduction of CO2
[Key points of this article]
Key points 1: Use rapid thermal injection method to grow CdSe on CsPbBr3 to form CsPbBr3/CdSe heterojunction material
Fig. 2. (a) Schematic diagram of CsPbBr3/CdSe synthesis; (b) TEM diagram of CsPbBr3/CdSe; (c) element scanning diagram; (d) high resolution diagram of CsPbBr3/CdSe; (e) XRD diagram of CsPbBr3/CdSe and CdSe; (f) UV absorption diagram of CsPbBr3, CdSe and CsPbBr3/CdSe.
2 Point 2: CsPbBr3/CdSe interface Pb-Se, Cd-Br bond promotes charge separation and catalytic performance and stability
Fig. 3. (a) Fluorescence spectrum; (b) Transient fluorescence spectrum; (c) Yield of each sample; (d) Cyclic stability of CsPbBr3/CdSe; (e) electrochemical impedance spectrum ; (f) Photocurrent response spectrum of catalyst .
Key points 3: The formation and reduction mechanism of CsPbBr3/CdSe interface bonds are explored
Fig. 4. (a) CsPbBr3/CdSe electron local function map; (b) CsPbBr3/CdSe differential charge density; (c) and (d) in situ infrared spectrum of catalysts.
Key points 4: CsPbBr3/CdSe heterojunction reaction mechanism and charge transfer path
Fig. 5. Charge transfer path and reaction mechanism diagram
[Article link]
https://pubs.rsc.org/en/content/articlepdf/2022/TA/D2TA05186A?page=search
[ Corresponding Author Introduction]
Profile of Professor Gong Xiu: 2020 graduated from the Wuhan National Optoelectronics Research Center of Huazhong University of Science and Technology in Wuhan National Optoelectronics Research Center, and studied under Professor Wang Mingkui from the Wuhan National Optoelectronics Research Center of Huazhong University of Science and Technology. He joined Guizhou University in 2020 and is currently a graduate supervisor of the condensed matter physics majoring in the School of Physics of Guizhou University. He has long been engaged in semiconductor photoelectric materials and devices, photoelectric catalytic materials design and application research, perovskite solar cell . As the first author or corresponding author, he has published many high-level research papers in Science Advanceds., Advanced Functional Materials., Nano letters., ACS Nano., J. Mater, Chem. A., etc., international journals.
Introduction to Teacher Wang Qinglong: graduated from the Nanomaterial Engineering Research Center of Henan University in June 2016 and obtained a Master of Science degree; 2016.07-2017.05, employed in Institute of Chemistry, Chinese Academy of Sciences ; 2017.09-2020.06, studied at the Wuhan National Research Center of Huazhong University of Science and Technology, with a Ph.D. in Engineering; 2021.09-Today: worked at the Nanomaterial Engineering Research Center of Henan University. The research direction is mainly the synthesis of nanomaterials in photo/electrocatalysis and the research on catalytic reduction of CO2. As the first author, he published high-level articles in international journals such as Nano Energy, Applied Catalysis B: Environmental, Applied Surface Science, etc.
Professor Zhang Wenhua Introduction: Learning experience: 1993: Bachelor of Chemical Engineering, Nanjing University of Technology, Bachelor of Chemical Engineering; 1997: Machelor of Inorganic Chemistry, University of Science and Technology, 2000: Shanghai Institute of Silicate, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese Academy of Sciences, Chinese ; 2015.11-2021.08: China Institute of Engineering Physics (Chengdu); 2021.09-To date: School of Materials and Energy, Yunnan University; Talent Program and Honors 2004: German Humboldt Scholar; 2009: Chinese Academy of Sciences 100 Talents Program; 2016: Sichuan Province 100 Talents Program Leading Talents; 2021: Yunnan University High-level Talents Introduction (Second Level) Academic Part-time Jobs: 2021: Member (Director) of Photovoltaics Committee of the Chinese Society of Renewable Energy; 2018: Deputy Secretary-General of Solar Materials Committee of the Chinese Society of Materials Research; 2016: Executive Editor of Journal of Energy Chemistry;
Professor Zhang Wenhua's main research directions are perovskite solar cells, electrocatalytic materials and photovoltaic electrolyzed water to produce hydrogen; in Energy & Environmental., Science Advanced Materials., Angew. Chem. Int. Ed., Advanced Functional Materials., Advanced Materials., J. Am. Chem. Soc., etc., published many high-level articles in international journals.
[First author introduction]
Yin Guilin , graduated from Shenyang University of Technology in 2020 and obtained a bachelor's degree in .He is currently a master's degree student in the School of Physics, Guizhou University. Mainly engaged in photocatalytic semiconductor conversion direction and perovskite solar cell direction.
