INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Fen Qiao,Wenjie Liu,Jing Yang,Yanzhen Liu,Jiaren Yuan
ZnO/CuInS 2 composites were synthesized by using electrospun ZnO chain structures as a template, along with InCl 3 , CuCl 2 , and thiourea as sources of indium , copper, and sulphur, respectively. The ZnO/CuInS 2 core-shell structure enhances light absorption and carrier transport efficiency. Moreover, ZnO/CuInS 2 exhibits superior light absorption and photocatalytic hydrogen production performance compared to ZnO, with a peak hydrogen production of 4188.24 μmol g −1 . The arrangement of energy levels within the ZnO/CuInS 2 heterojunction is the crucial factor in enhancing photocatalytic properties. Increased electrons distribution near the interface facilitates the transport performance of charge carriers, which accelerates hydrogen production kinetics at the interface, and promotes greater participation of photogenerated electrons and holes in catalytic reactions . Combined with the application of density functional theory, the computational analyses of work function and differential charge support this assertion. This paper introduces a fresh method for creating innovative photocatalysts and grasping the reaction mechanism involved in photocatalytic hydrogen generation .
研究领域:
材料科学
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能源化学
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计算化学
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DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Chen Liao,Zhizhong He,Feng Wang,Ya Liu,Liejin Guo
Photocatalytic CO2 conversion is a promising approach to simultaneously mitigate climate change and alleviate the energy crisis. However, infrared light, which constitutes nearly half of the solar energy, has not been effectively utilized yet. In this work, we discover a photogenerated charge transition mechanism in CuInS2 with intrinsic InCu antisite defects for synergistic utilization of full-spectrum photons. Femtosecond transient absorption spectroscopy and DFT calculation unveil an intermediate band induced by the intrinsic antisite defects, where cascaded sub-band transition could be realized by high-energy photons (UV–vis) and low-energy (IR), thus improving the absorption range of infrared light as well as the utilization efficiency of photogenerated carriers. In situ Kelvin probe force microscopy demonstrates that the generation of photoexcited electrons could be greatly enhanced through this synergistic utilization of full spectrum light. Moreover, in situ X-ray photoelectron spectroscopy and in situ diffuse reflectance infrared Fourier transform spectroscopy reveal that infrared photons could also enhance the adsorption and activation of CO2 and H2O on the catalyst surface. As a result, the CO production rate under full spectrum light reaches 19.9 μmol g–1 h–1, which is more than a 7-fold increase over that under UV–vis irradiation.
研究领域:
材料科学
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环境科学
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物理化学
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产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2024
·
IF 15.8
Zhenyang Liu,Chaoqi Hao,Yejing Liu,Rongzhen Wu,Jianen Zhang,Zhuo Chen,Fenghe Wang,Li Guan,Xu Li,Aiwei Tang,Ou Chen
Short-wave infrared (SWIR) light-emitting diodes (LEDs) have emerged as promising technologies for diverse applications such as optical communication, biomedical imaging, surveillance, and machine vision. Colloidal quantum dots (QDs) are particularly attractive for SWIR LEDs due to their solution processability, compatibility with flexible substrates, and tunable absorption and luminescence. However, the presence of toxic elements or precious metals in most SWIR-emitting QDs poses health, environmental, and cost challenges. In this context, CuInS2 (CIS) QDs are known for low toxicity, cost-effective fabrication, and SWIR-light emitting capability. However, CIS QDs have not yet been directly utilized to fabricate SWIR LEDs to date, which is due to low particle stability, inefficient charge carrier recombination, and significantly blue-shifted luminescence after integrating into LED devices. To address challenges, we propose a dual-passivation strategy using ZnI2 as a chemical additive to enhance both the optical property of plain CIS QDs and charge carrier recombination upon LED device implementation. The resulting CIS-QD-based LEDs exhibit a stable SWIR electroluminescence (EL) peak (over 1000 nm) with a high EL radiance and a record external quantum efficiency in the SWIR region. Our study represents a significant step forward in SWIR-QLED technology, offering a pathway for the development of high-performance, low-cost, and nontoxic SWIR light sources.
研究领域:
材料科学
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光电子学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 17
·2835-2844
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IF 5.047
Hui Zhang,Youshen Wu,Zhenhai Gan,Yuexuan Yang,Yiming Liu,Peng Tang,Daocheng Wu
Accurate and sensitive temperature sensing is of great importance for studying biological activities in cells and tissues. Due to the complexity of the microenvironments, most of the existing thermometry systems cannot meet the needs of accurate intracellular and in vivo temperature sensing with high-sensitivity and low-toxicity. After investigation, we found that the fluorescence intensity of CuInS2/ZnS quantum dots (QDs) is significantly temperature dependent, and these QDs can be used for intracellular and in vivo temperature sensing after being encapsulated by amphiphilic micelles (QD-micelles). These QD-micelles have a size of approximately 10.1 ± 2.5 nm and an emission band of approximately 650 nm with intense photoluminescence (PL). Meanwhile, its high thermal sensitivity of 2% °C−1 at near-room temperature is insensitive to solution pH, ionic strength, and protein concentration. Even at a concentration of 300 μg mL−1, our QD-micelles do not exert cytotoxic effects on HeLa and PC-3 cells. Similar to being dispersed in water, the QD-micelles continue to exhibit a high thermal sensitivity of 2.0% °C−1 intracellular and 2.1% °C−1 in tumor tissues, and the PL intensity (I) and temperature (T) over the physiological temperature range have a good linear correlation. Therefore, they have considerable potential in biomedical applications.
研究领域:
生物医学工程
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纳米医学
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分子生物学
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DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2017
·Vol. 147
·期 7
·1631-1639
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IF 2.799
Zhang Zhengwei,Xiao An,Yan Kun,Liu Yanhua,Yan Zhengyu,Chen Jianqiu
Abstract Herein, the CuInS 2 /ZnS/TGA quantum dots (QDs) were prepared by the oil phase reaction containing thioglycolic acid (TGA) as a functional modification agent under a nitrogen atmosphere. The CuInS 2 /ZnS/TGA QDs using as the photocatalysts exhibited high photocatalytic activity for the degradation of Rhodamine B (RhB) under ultraviolet irradiation. The photocatalytic conditions were optimized to degrade RhB with superior performances, including the initial RhB and CuInS 2 /ZnS/TGA QDs concentrations, solution pH values and ultraviolet light intensities. Furthermore, the kinetic equations of photocatalytic reaction and possible photocatalytic degradation mechanism were investigated. The results indicated that it belongs to the typical first order kinetic in accordance with the Langmuir–Hinshelwood mechanism, and the electrons and holes on the surface of the CuInS 2 /ZnS/TGA microspheres are the main acting forces during the RhB photocatalytic degradation. Graphical Abstract
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 19
·9251-9259
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IF 4.197
Aiwei Tang,Zunlan Hu,Zhe Yin,Haihang Ye,Chunhe Yang,Feng Teng
A simple one-pot colloidal method has been described to engineer ternary CuInS2 nanocrystals with different crystal phases and morphologies, in which dodecanethiol is chosen as the sulfur source and the capping ligands. By a careful choice of the anions in the metal precursors and manipulation of the reaction conditions including the reactant molar ratios and the reaction temperature, CuInS2 nanocrystals with chalcopyrite, zincblende and wurtzite phases have been successfully synthesized. The type of anion in the metal precursors has been found to be essential for determining the crystal phase and morphology of the as-obtained CuInS2 nanocrystals. In particular, the presence of Cl− ions plays an important role in the formation of CuInS2 nanoplates with a wurtzite–zincblende polytypism structure. In addition, the molar ratios of Cu to In precursors have a significant effect on the crystal phase and morphology, and the intermediate Cu2S–CuInS2 heteronanostructures are formed which are critical for the anisotropic growth of CuInS2 nanocrystals. Furthermore, the optical absorption results of the as-obtained CuInS2 nanocrystals exhibit a strong dependence on the crystal phase and size.
研究领域:
材料科学
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纳米技术
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化学工程
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2018
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IF 2.21
Xiaoying Lu,Fang Deng,Min Liu,Xubiao Luo,Aijie Wang
CuInS 2 semiconductor were synthesized by regulating Cu/In molar ratio via a hot solvent method. Different Cu/In molar ratio in reaction system had significant influence on the BET surface area , charge separation and photocatalytic activity of CuInS 2 . The CuInS 2 with optimal Cu/In ratio of 1:1.5 exhibits the most efficient charge separation and transfer, leading to the highest photocatalytic activity . The mineralization efficiency of pharmaceutical wastewater by CuInS 2 (Cu:In = 1:1.5) was 67.5% in 6 h, and CuInS 2 (Cu:In = 1:1.5) exhibited high stability, indicating that CuInS 2 has a promising prospect in real pharmaceutical wastewater treatment .
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
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IF 7.145
Lili Yan,Zhichun Li,Mingxing Sun,Guoqing Shen,Liang Li
Semiconductor quantum dots (QDs) are suitable light absorbers for photocatalysis because of their unique properties. However, QDs generally suffer from poor photochemical stability against air, limiting their applications in photocatalysis. In this study, a stable solar-light-driven QDs-containing photocatalytic film was developed to facilitate photocatalytic degradation of the soil fumigant 1,3-dichloropropene (1,3-D). Highly stable CuInS2/ZnS:Al core/shell QDs (CIS/ZnS:Al QDs) were synthesized by doping Al into the ZnS shell and controlling ZnS:Al shell thickness; the CIS/ZnS:Al QDs were subsequently combined with TiO2 to form a CIS/ZnS:Al-TiO2 photocatalyst. The optimized ZnS:Al shell thickness for 1,3-D photodegradation was approximately 1.3 nm, which guaranteed and balanced the good photocatalytic activity and stability of the CIS/ZnS:Al-TiO2 photocatalyst. The photodegradation efficiency of 1,3-D can be maintained up to more than 80% after five cycles during recycling experiment. When CIS/ZnS:Al-TiO2 was deposited as photocatalytic film on a flexible polyethylene terephthalate substrate, over 99% of cis-1,3-D and 98% of trans-1,3-D were depleted as they passed through the film during 15 h of irradiation under natural solar light. This study demonstrated that the stable CIS/ZnS:Al-TiO2 photocatalyst both in powder and film form is a promising agent for photodegradation and emission reduction of soil fumigants.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Science China-Chemistry
·
2020
·Vol. 63
·期 12
·1721-1726
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IF 6.356
He Chaohua,Chen Sijia,Long Ran,Song Li,Xiong Yujie
The sharp rise of CO 2 in the atmosphere has become a potential threat to global climate, which results from the massive utilization of fossil fuel since the industry revolution. CO 2 electroreduction provides us a new possibility of utilizing CO 2 as a carbon feedstock for fuel and commercial chemicals generation. In this article, a new method is developed for synthesizing CuInS2 hollow nanostructures through the Kirkendall effect. The CuInS 2 hollow nanostructures exhibit excellent catalytic activity for electrochemical reduction of CO 2 with particular high selectivity, achieving high faradaic efficiency for HCOOH of 72.8% at −0.7 V. To elucidate the mechanisms, operando electrochemical Raman spectroscopy is employed to examine the CO2 reduction process. This work provides new insights into the design of hollow nanostructures toward electrocatalytic CO2 conversion and offers us an effective and reliable way for real-time investigation of electrochemical CO2 reduction reaction processes.
研究领域:
材料科学
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电催化
·
环境科学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2018
·
IF 6.14
Ying-Chu Chen,Hao-Hsuan Chang,Yu-Kuei Hsu
Decoration of CuInS2 (CIS) quantum dots (QDs) on ZnO nanowires (NWs) with an interlayer of In2S3 as photoelectrode has been successfully fabricated on FTO via the simple solution routes for photoelectrochemical (PEC) application. Scanning electron microscopy, transmission electron microscopy, and X-ray diffraction are utilized to systematically analyze the morphology and structure of the CIS QD/In2S3/ZnO NWs heterostructure. The composition of this multilayer heterostructure and the removal of QD ligands by a thermal process are confirmed by X-ray photoelectron spectra. In comparison with CIS QDs/ZnO NWs, the CIS QD/In2S3/ZnO heterostructural photoelectrode displays an efficient charge separation and carrier transport path for photocurrent up to 2.4 mA·cm–2 that is competitive with other Cd- and Pb-free QD-based materials. In addition, Mott–Schottky analysis demonstrates the negative shift of the flat band in the CIS QD/In2S3/ZnO, which benefits the early onset potential. Significantly, this hierarchical photoelectrode shows the improvement the absorption and conversion of solar light in the visible region obtained using a pristine ZnO structure. Our research paves the way for exploring lead-free and lead-free sulfide materials in the new category of solar applications.
研究领域:
材料科学
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太阳能技术
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纳米科技
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2015
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IF 6.723
Chuanzhen Zhao,Zelong Bai,Xiangyou Liu,Yijia Zhang,Bingsuo Zou,Haizheng Zhong
An efficient ligand exchange strategy for aqueous phase transfer of hydrophobic CuInS2/ZnS quantum dots was developed by employing glutathione (GSH) and mercaptopropionic acid (MPA) as the ligands. The whole process takes less than 20 min and can be scaled up to gram amount. The material characterizations show that the final aqueous soluble samples are solely capped with GSH on the surface. Importantly, these GSH-capped CuInS2/ZnS quantum dots have small size (hydrodynamic diameter <10 nm), moderate fluorescent properties (up to 34%) as well as high stability in aqueous solutions (stable for more than three months in 4 °C without any significant fluorescence quenching). Moreover, this ligand exchange strategy is also versatile for the aqueous phase transfer of other hydrophobic quantum dots, for instance, CuInSe2 and CdSe/ZnS quantum dots. We further demonstrated that GSH-capped quantum dots could be suitable fluorescence markers to penetrate cell membrane and image the cells. In addition, the GSH-capped CuInS2 quantum dots also have potential use in other fields such as photocatalysis and quantum dots sensitized solar cells.
研究领域:
材料科学
·
生物学
·
医学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
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2017
·
IF 2.429
Caiyan YU,Tongtong XUAN,Sunqi LOU,Xiaoxiao LIU,Guohai LIAN,Huili LI
Recently, CuInS 2 /ZnS nanocrystals (CISZ NCs) have been widely used in many fields due to their excellent properties, such as tunable photoluminescence (PL) spectra, broad absorption, and non-toxicity. In order to expand the application of CISZ NCs, Gd 3+ was introduced into the host serving as paramagnetic modules to achieve magnetic resonance imaging (MRI) enhancement. MRI probes could provide high-resolution anatomical information. The derived Gd-Cu-In-S/ZnS nanocrystals (GCISZNCs) exhibited the strong orange photoluminescence with a quantum yield of 57.6% and significantly high longitudinal relaxivity ( r 1 =20.4 mmol/s) in comparison with commercial Magnevist (Gd-DTPA, r 1 =4.5 mmol/s). Effective enhancement of MRI and improved longitudinal relaxivity as well as lower cytotoxicity mode GCISZ NCs an ideal MRI probe, suggesting its potential and significance in practical biological and clinic applications in the future.
研究领域:
生物医学工程
·
材料科学
·
医学影像学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）