ChemSusChem
·
2024
·
IF 7.5
Dong Li,Kaixuan Wang,Ying Chen,Renyi Li,Jiahong Tang,Yizhou Zhao,Wei Guo,Qi Chen,Yujing Li
Graphical A 0D/1D CPB@TCN heterojunction photocatalyst for CO 2 reduction is synthesized by immobilizing CsPbBr 3 (CPB) quantum dots on one-dimensional porous tubular g-C 3 N 4 (TCN). The strong Pb−N chemical bonding between CPB quantum dots and TCN provides a fast charge transfer channel for the CPB@TCN, which promotes the efficient separation and transfer of photogenerated carriers, resulting in excellent photocatalytic activity. Halide perovskite CsPbBr 3 (CPB) quantum dots (QDs) are considered as a promising candidate for solar-driven CO 2 conversion for their unique optoelectronic properties and suitable band structures. However, the CO 2 conversion efficiency of pristine CsPbBr 3 quantum dots is severely limited due to their rapid electron-hole pair recombination and insufficient active sites. In this study, by immobilizing CPB QDs onto one-dimensional (1D) porous tubular g-C 3 N 4 (TCN), an effective 0D/1D CPB@TCN heterojunction photocatalyst for CO 2 reduction is fabricated. Density functional theory (DFT) calculations combined with experimental studies demonstrate that CPB QDs are uniformly anchored on the surface of TCN through Pb−N chemical bonding, resulting in efficient separation and transfer of photogenerated carriers in CPB@TCN photocatalysts. The resultant CPB@TCN photocatalysts exhibit significantly enhanced photocatalytic activity for CO 2 reduction with the highest conversion rate of 22.62 μmol g −1 h −1 , which is 5.33-times higher than that of pristine CPB QDs. This work unveils the interfacial bonding mechanism of CPB@TCN heterojunction through Pb−N chemical bond, which provides new insights for the development perovskite-based heterojunction photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2018
·Vol. 11
·期 4
·1784-1789
·
IF 7.233
Qiang Jing,Yue Xu,Yucong Su,Xing Xing,Zhenda Lu
Cs4PbBr6 nanocrystals (NCs) have been recently studied as they can enhance the light emitting efficiency and stability of CsPbBr3 NCs. However, the synthesis of Cs4PbBr6 NCs is often accompanied by the generation of CsPbBr3 NCs, and less attention has been paid to how to exactly control their formation. Here, we investigated the key factors in deciding the final products in the hot-injection synthesis by a modified amine-free method. We found that the molarity ratio of Cs/Pb dominated the final products, while the amount of bromine had a relatively small effect. In addition, introducing a certain amount of oleylamine into the amine-free reaction leads to the formation of Cs4PbBr6, instead of CsPbBr3 NCs. This clearly shows that the protection ligand oleylamine also plays an important role in the formation of Cs4PbBr6 NCs. This well understood and fine control of the synthesis may inspire a new CsPbBr3@Cs4PbBr6 core–shell structure, with the same chemical elements but a different crystal phase in the core and the shell. This nanostructure would open a new avenue for enhancing the stability of perovskite nanocrystals.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 40
·18790-18796
·
IF 6.97
Zizhen Zhang,Yixuan Liu,Chong Geng,Shuangshuang Shi,Xinsu Zhang,Wengang Bi,Shu Xu
Microfluidics has been considered as an effective platform in the mechanism study and large-scale manufacturing of nanomaterials. In this work, we report the facile synthesis of quantum-confined CsPbBr3 nanowires (NWs) by using a continuous-flow microfluidic reactor. The optimized reaction temperature is around 50 °C, and one “synthesis run” by microfluidics requires only ten minutes. This study reveals that the formation of CsPbBr3 NWs takes place by a hybrid growth mechanism of seed-mediated growth and oriented attachment growth. This microfluidic approach benefits the alignment of the short quantum-confined NWs and promotes their oriented attachment to form long NWs, while conventional flask synthesis results in large and irregular nanorods under the same reaction conditions. This work not only provides a new synthetic path for the preparation of CsPbX3 NWs but also sheds some light on the fundamental study of CsPbX3 NWs.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiaofeng Lai,Song Wang,Ying Xie,Binghang Liu,Jianhui Sun,Yuxin Li,Haitao Yu,Kai Pan
CsPbBr3 perovskite nanocrystals have emerged as promising candidates for photocatalysis. However, their conversion efficiency is hampered by material instability, and the accumulation of deactivated perovskites produced after photocatalytic reactions raises significant environmental concerns. To address this issue, we developed a mechanochemical grinding approach assisted by oleylamine as an additive to restore the optical properties and photocatalytic activity of deactivated CsPbBr3, which was due to aggregation in the photocatalytic CO2 reduction reaction. Upon regeneration, the CsPbBr3 nanocrystals exhibited an average length of 34.21 nm and an average width of 20.86 nm, demonstrating optical properties comparable to those of the pristine CsPbBr3 nanocrystals. Moreover, they achieved a conversion efficiency of 88.7% compared with pristine CsPbBr3 nanocrystals in the photocatalytic CO2 reduction reaction. This method effectively enhanced the utilization of CsPbBr3, offering a novel approach for the recycling and recovery of perovskite materials and thereby minimizing material waste and environmental pollution.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Chenfei Wang,Canyun Zhang,Fengchao Wang,Jin Chen,Enliang Ren,Jinfang Kong,Lan Li,Jiayue Xu,Yan Zhang
All-inorganic lead halide perovskite nanocrystals (NCs) have attracted enormous attention owing to their excellent optical properties such as ultrahigh photoluminescence quantum yield (PLQY), narrow full width at half maximum (FWHM) and broad emission spectra tunability. In this study, we reported the synthesis of colloidal perovskite NCs based on CsPbBr 3 @Cs 4 PbBr 6 composite structure. With the assistance of Tetraoctylammonium bromide (TOAB) ligands, the prepared CsPbBr 3 @Cs 4 PbBr 6 NCs show high PLQY of 94.7% and enhanced stability. The crystal morphology and phase structure of the CsPbBr 3 @Cs 4 PbBr 6 NCs were investigated by HRTEM and XRD measurements. In addition, the crystal morphology of CsPbBr 3 @Cs 4 PbBr 6 NCs presents cubic and circular particles with an average size of 9.3 nm. Compared with CsPbBr 3 NCs, the diphase CsPbBr 3 @Cs 4 PbBr 6 composite materials can perform higher optical properties due to the in-situ passivation of the generated Cs 4 PbBr 6 NCs. Furthermore, the fabricated LED device exhibits bright white light emission with a color coordinate of (0.335, 0.337), the corresponding color temperature of 5390 K and a color rendering index of 82.1 under the injection current of 30 mA. These results demonstrate that the obtained CsPbBr 3 @Cs 4 PbBr 6 NCs have a potential application in white light-emitting and display devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 23
·21154-21167
·
IF 2.22
Yuan Beilei,Li Ning,Liu Jialiang,Xu Fan,Li Chen,Juan Fangying,Yu Huanqin,Li Cuncheng,Cao Bingqiang
Inorganic perovskite cesium lead bromide (CsPbBr 3 ) gets extensive attention due to its superb stability and moisture-tolerance feature. Here, solution-processed CsPbBr 3 perovskite films and their based solar cells were fabricated in ambient condition. The effect of post-annealing on the properties of the CsPbBr 3 film grown and the photoelectric performance of perovskite solar cells (PSCs) have been systematically investigated, which enhances the device power conversion efficiency (PCE) from 2.67 to 5.20%. Moreover, by doping mesoporous TiO 2 (m-TiO 2 ) with reduced graphene oxide (RGO), the PCE of solar cells attained an apparent enhancement and finally improved to 7.08%. Not only high-quality CsPbBr 3 perovskite films but also high-performance mesoporous PSCs were obtained by film post-annealing and electron transport layer (ETL) doping, which were all fabricated in ambient conditions.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS
·
2019
·
IF 1.822
Fangying Juan,Fan Xu,Mei Wang,Mingxu Wang,Guozhi Hou,Jun Xu,Haoming Wei,Yinghua Wang,Yangqing Wu,Bingqiang Cao
Plasmonic Au nanorods/CsPbBr 3 quantum dots film has been prepared via spin-coating. It is found that photoluminescence intensity of Au nanorods/CsPbBr 3 quantum dots film exhibits 2-fold enhancement compared with pristine CsPbBr 3 quantum dots film. Time-resolved photoluminescence decay curves show that the lifetime of CsPbBr 3 quantum dots film decreases from 6.15 ns to 4.78 ns after combining with Au nanorods. The finite-difference time-domain simulation indicates that Au nanorods arouse a localized surface plasmon resonance around 500 nm, which enhances the emission intensity of CsPbBr 3 quantum dots film.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2023
·Vol. 25
·期 4
·1-11
·
IF 2.5
Fu Lili,Gao Yongjin,Zheng Ruilin,Feng Qidong,Chen Ming,Qin Tianjie,Liu Chunxiao,Wei Wei
The encapsulation of CsPbBr 3 nanocrystals (NCs) in oxide glass can effectively avoid contact of the external environment with the halide perovskite. However, the effects of hydroxyl and oxygen on NCs cannot be completely excluded because of the nature of oxide glass itself. Here, we proposed a new solution to solve these problems by using fluorophosphate (FP) glass as the embedding matrix. The composition (Br concentration) and heat treatment conditions (temperature and time) of the glass matrix were designed and optimized to improve the optical properties of CsPbBr 3 NCs. The results showed that highly pure green light with an emission peak of 534 nm and a full-width at half-maximum (FWHM) of approximately 19 nm was achieved using CsPbBr 3 NCs@glass and a light-emitting diode (LED)/laser diode (LD). The Commission Internationale de l'Eclairage (CIE) coordinates of the two devices were (0.243, 0.723) and (0.239, 0.739), with very high color purities of 96.6% and 97.3%, respectively. The photoluminescence quantum yields (PLQYs) of the samples excited at 365 nm and 450 nm wavelengths were 34.54% and 38.85%, respectively. Additionally, the chemical stability of CsPbBr 3 NCs was significantly improved by the encapsulation in FP glass, retaining 88% of the original PL intensity after 30 days of storage in deionized water. This work provides a new choice to improve the stability of a halide perovskite in a matrix.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Dong Li,Renyi Li,Yizhou Zhao,Kaixuan Wang,Ke Fan,Wei Guo,Qi Chen,Yujing Li
Perovskite CsPbBr 3 quantum dot shows great potential in artificial photosynthesis, attributed to its outstanding optoelectronic properties. Nevertheless, its photocatalytic activity is hindered by insufficient catalytic active sites and severe charge recombination. In this work, a CsPbBr 3 @Ag-C 3 N 4 ternary heterojunction photocatalyst is designed and synthesized for high-efficiency CO 2 reduction. The CsPbBr 3 quantum dots and Ag nanoparticles are chemically anchored on the surface of g-C 3 N 4 sheets, forming an electron transfer tunnel from CsPbBr 3 quantum dots to Ag nanoparticles via g-C 3 N 4 sheets. The resulting CsPbBr 3 @Ag-C 3 N 4 ternary photocatalyst, with spatial separation of photogenerated carriers, achieves a remarkable conversion rate of 19.49 μmol·g −1 ·h −1 with almost 100 % CO selectivity, a 3.13-fold enhancement in photocatalytic activity as compared to CsPbBr 3 quantum dots. Density functional theory calculations reveal the rapid CO 2 adsorption/activation and the decreased free energy (0.66 eV) of *COOH formation at the interface of Ag nanoparticles and g-C 3 N 4 in contrast to the g-C 3 N 4 , leading to the excellent photocatalytic activity, while the thermodynamically favored CO desorption contributes to the high CO selectivity. This work presents an innovative strategy of constructing perovskite-based photocatalyst by modulating catalyst structure and offers profound insights for efficient CO 2 conversion.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 7
·2980-2985
·
IF 3.288
Zhen Li,Li Li,Huali Liu,Fei Li,Jiaqi Zhao,Yu Wang
Mn2+-doped CsPbBr3 nanocrystals (NCs) within MCM-41 mesophase silica have been prepared via a template-assisted strategy by using MCM-41 as the template. The template-synthesized CsPb1−xMnxBr3 NCs (x = 0–1) with the investigated perovskite compositions are luminescent with 465 nm pure blue light. The coprecipitation of bulk materials can be controlled by varying the amount of Mn2+ doping because the formation energy of CsPbBr3 NCs rises slightly on increasing the Mn2+ content and then decreases with the further increase in the Mn2+ content. Furthermore, they also exhibit excellent UV and air stability due to the existence of MCM-41 mesoporous silica and can be used as phosphors for solid-state lighting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yanzhao Wu,Xiaoyang Yue,Jiajie Fan,Xiaoming Hao,Quanjun Xiang
In recent years, the semimetal bismuth with surface plasmon resonance (SPR) effect has attracted great attention due to its application in enhancing photocatalytic activity. Herein, we developed a novel plasma-enhanced Bi/CsPbBr 3 composite photocatalyst by in situ growth method (BCPB-IS) using the fabricated CsPbBr 3 nanosheets (CPB) as the substrate for subsequent growth of Bi nanoparticles. Without the addition of any sacrificial agent, the CO yield of BCPB-IS reaches 76.4 µmol g −1 with an over 97% selectivity of CO under 4 h visible light irradiation. Such remarkable CO 2 reduction activity far exceeds that of pure CPB. The enhanced activity can be attributed to these factors: (1) The SPR effect from the loading of Bi NPs enhances the light response performance of BCPB; (2) The simultaneously generated hot electrons leads to rising ambient temperature, which promotes the electron transfer efficiency and photoreduction reaction efficiency; (3) The energy band bending effect at the interface of BCPB further improves the carrier separation and transfer performance. The enhanced separation and transfer performance of photogenerated carriers were investigated in detail by X-ray photoelectron spectroscopy (XPS), Infrared thermograms and Time-resolved photoluminescence spectra (TRPL).
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yufan Xu,Bo Huang,Bin Liu,Shitong Li,Huichao Zhang,Hongyu Yang,Ruilin Xu
Due to their remarkable suitability for mass production, micro-scale flow strategies for inorganic perovskite nanocrystals (NCs) are rapidly developed. However, the existing microfluidic systems belong to single-stage thermal reactors and cannot achieve temperature adjustment during NC preparation like the hot-injection method to attain beneficial crystallization and growth temperatures. In this work, we designed two-stage microfluidic system with two heating reaction modules to carry out the growth of CsPbBr 3 NCs experiencing dual reaction temperatures in flow. The nanoplatelets formed due to lower precursor combination temperatures in the first stage are mostly transformed into cuboidal NCs by a second heating reaction, improving the stability of the CsPbBr 3 NCs. Furthermore, the mixed morphology probably impedes the amplified spontaneous emission (ASE) performance, so uniform cuboidal NCs (average size of 18.3 nm) have a lower ASE threshold of 4.6 μJ cm −2 at room temperature. Additionally, this system effectively avoids the precipitation of PbBr 2 precursor at elevated temperatures, thus enabling the successful fabrication of larger-sized NCs (28.2 nm) upon raising the preparation temperature to 250 °C.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）