CATALYSIS LETTERS
·
2018
·Vol. 148
·期 7
·1990-2000
·
IF 2.911
Zhang Kai,Zhang Yunhai,Zhang WanJu
Abstract A kind of 2D/2D heterojunction photocatalysts was constructed by a facile in situ hydrothermal method that a tetragonal CuInS 2 nanosheets was horizontal loaded in ultrathin hexagonal SnS 2 nanosheets. Contrasted to pure CuInS 2 and SnS 2 nanosheets, the CuInS 2 /SnS 2 nano-heterojunctions revealed a noteworthy improvement photocatalytic activity under visible light irradiation for the degradation of organic dyes, which should be attributed to the narrowest band gap and the efficient charge separation and transfer improving the contact region in heterojunction interface. Especially, with 0.5 wt% addition of CuInS 2 , the heterojunction nanosheets shows a supreme visible-light photocatalytic activity and a superb degradation efficiency which reached 99% in 60 min with the solution of methyl orange. Moreover, CuInS 2 /SnS 2 nano-heterojunctions deliver excellent reusability in five degradation–regeneration cycles. The results indicated that CuInS 2 /SnS 2 has a promising prospect in organic pollutant treatment due to high efficiency and excellent stability. Graphical Abstract
研究领域:
材料科学
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环境科学
·
化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Kefen Yang,Jinman Yang,Yusupu Yesire,Kang Zhong,Pengcheng Yan,Huanzhi Liu,Huaming Li,Yanhua Song,Minqiang He,Hui Xu
Photocatalytic CO 2 conversion efficiency is still much lower than what is expected owing to the sluggish charge separation and transfer for many semiconductors. Herein, we fabricated a highly efficient S-scheme heterojunction by integrating the CuInS 2 (CIS) with the oxygen-doping brown polymer carbon nitride (PCN). The construction of CIS/PCN S-scheme heterojunction promotes spatial separation of photogenerated charge while maintaining their strong reduction capability. The formed intimate contact interface between the CIS and PCN provides the strong driving force for the transfer of photogenerated charge, which accelerates the electrons rapidly migrating from PCN to CIS through the tight interface, resulting in more reductive electrons participating in photocatalytic reaction. As a result, the CIS/PCN S-scheme heterostructure shows a remarkably enhanced photocatalytic activity with a CO yield rate of up to 105.89 μmol g -1 h −1 , which is 7 times higher than that of the CIS. Combined density functional theory (DFT) calculations with experimental results demonstrate the formation of an intimate contact interface is not only more conducive to CO 2 adsorption and activation but also lowers the reaction energy barrier of the conversion of CO 2 to CO. Meanwhile, ESR characterization reveals the electron transfer pathway of CIS/PCN for photocatalytic CO 2 conversion. This work may provide an illuminating insight into designing the S-scheme photocatalyst for enhanced CO 2 photoreduction.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Fang Deng,Xiaoying Lu,Yingbo Luo,Jie Wang,Wenjie Che,Ruijie Yang,Xubiao Luo,Shenglian Luo,Dionysios D. Dionysiou
A series of visible-light-driven direct Z-scheme CdS/CuInS 2 nanoplates were fabricated by a facile one-step hydrothermal method, and the molar ratio of CdS to CuInS 2 was optimized. The highest visible-light photocatalytic degradation activity of Z-scheme (1:0.03) CdS/CuInS 2 heterojunction is about 4 times than that of pure CuInS 2 , which is due to the narrowest band gap, the largest BET surface area, the most efficient charge separation and transfer, and the synergistic effect between CdS and CuInS 2 . Meanwhile, Z-scheme (1:0.03) CdS/CuInS 2 heterojunction also exhibits excellent photocatalytic reduction activity with almost 100% of aqueous Cr(VI) reduction efficiency in absence of hole scavengers after 60 min. The special significance is that Z-scheme (1:0.03)CdS/CuInS 2 heterojunction shows excellent stability in five degradation cycles, and can effectively treat real pharmaceutical wastewater with 76.5% COD removal efficiency with aid of H 2 O 2 in 13 h, indicating that Z-scheme CdS/CuInS 2 has a promising prospect in real pharmaceutical wastewater treatment.
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
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 12
·125018
·
IF 1.449
Hui Zou,Yi Wu,Caixia Yao,Shiqi Duan,Zhiyuan Liu,Zhengyu Yan,Shenghua Liao
A novel method for preparing CuInS2/ZnS quantum dots (CuInS2/ZnS QDs) with the crystal structure of sphalerite by one-pot hot injection was developed in this paper. The as-prepared core CuInS2 quantum dots (CuInS2 QDs) was uniform spherical nanoparticle with the average diameter of about 2 nm with the fluorescent quantum yields (QY) of about 2.6%. By capping a shell of ZnS on the surface of CuInS2 QDs, the formed CuInS2/ZnS QDs exhibited obvious enhanced fluorescent emission with the QY of about 20%. Intriguingly, the crystal structure of obtained CuInS2/ZnS QDs is sphalerite, which was confirmed by XRD. Considering the different terminal group between these small organic molecules, mercaptoacetic acid (TGA), thioglycerol (TGC) and mercaptoethylamine (MEA) were further selected as capping molecules to exchange the surface ligands of CuInS2/ZnS QDs. The obtained CuInS2/ZnS QDs modified with TGC exhibited excellent photostability in physiological conditions. To investigate the effect of ligand molecules on the biocompatible of CuInS2/ZnS QDs, the experiment on the cytotoxicity of CuInS2/ZnS QDs to A549 cells were conducted. The results indicated that CuInS2/ZnS QDs capped with TGC showed the lowest cytotoxicity while CuInS2/ZnS QDs capped with MEA exhibited the highest cytotoxicity among the three types of CuInS2/ZnS QDs modified with ligands with different terminal group. These results provided a sight on how to select surface ligands to modify CuInS2/ZnS QDs when CuInS2/ZnS QDs will apply in biological fields.
研究领域:
材料科学
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生物医学
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
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2022
·
IF 8.008
Shuangtian Dong,Dongyang Wang,Xuwen Gao,Li Fu,Jingna Jia,Yuqi Xu,Bin Zhang,Guizheng Zou
All commercial chemiluminescence (CL) assays are conducted with either glow or flash CL of eye-visible waveband from chemical luminophores. Herein, glow and flash, as well as waveband adjustable CL from the same nanoparticle luminophore of thiol-capped CuInS2@ZnS nanocrystals (CIS@ZnS-Thiol), are proposed via extensively exploiting the differed redox nature of CL triggering reagents. Taking thiosalicylic acid (TSA) as the model thiol-capping agent, the electron-injection-initiated charge transfer between CIS@ZnS-TSA and reductant can bring out efficient glow CL while the hole-injection-initiated charge transfer between CIS@ZnS-TSA and oxidant can give off obvious flash CL under optimum conditions. The maximum emission wavelength for CL of CIS@ZnS-TSA is adjustable from 730 nm to 823 nm via employing different triggering agents. Promisingly, the coexistent reductant of N2H4·H2O and oxidant of H2O2 can be employed as dual triggering reagents to trigger eye-visible and highly efficient flash CL from CIS@ZnS-TSA. The maximum emission intensity for flash CL of CIS@ZnS-TSA/N2H4–H2O2 is 101-fold greater than the glow CL of CIS@ZnS-TSA/N2H4 and 22-fold greater than the flash CL of CIS@ZnS-TSA/H2O2, respectively. The flash CL from CIS@ZnS-TSA/N2H4–H2O2 is qualified for highly sensitive and selective CL immunoassay in a commercialized typical procedure with the entire operating process manually terminated within 35 min.
研究领域:
纳米技术
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分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
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2018
·
IF 4.525
Liwang Liu,Hong Li,Zirui Liu,Ya-Hong Xie
By hot-injection method with altering the dose of oleylamine (OAm) in a reaction system, CuInS 2 (CIS) nanocrystal with tunable structure and band gap is synthesized. Through various measurements, including X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS), it is demonstrated experimentally that when the dose of OAm is relatively high (2.0 and 2.5 ml in this work), the combination phase of pseudo-chalcopyrite/wurtzite are obtained with a surprising existence of nanotwins. Besides, the molar fraction of wurtzite is larger in the sample using 2.5 ml OAm in the reaction system. However, when the dose of OAm becomes low, (0, 1.0 and 1.5 ml), pure zinc-blende CIS pyramidal quantum dots (QDs) can be prepared. This indicates that oleylamine promotes the formation of wurtzite structure. In addition, the band gap is larger with increasing of OAm, following the quantum refinement effects. This work serves as a facile method of synthesizing CIS nanocrystal with tunable structure and band gap, which will be possibly applied in the fabrication of their optoelectronic devices.
研究领域:
材料科学
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纳米技术
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光电子学
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
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2019
·
IF 0
Wangwei Chen,Juanjuan Qi,Chao Dong,Junwei Chen,Zhitao Shen,Yonglin He,Shangfeng Yang,Tao Chen,Chong Chen,Yunliang Li,Ming-De Li,Mingtai Wang
A facile solution-processing method featuring the applications of a stable molecular precursor solution and the repetition of spin-coating and annealing for film growth is reported for the in situ growth of CuInS2 nanoparticle films on TiO2/CdS film to provide TiO2/CdS/CuInS2 ternary superstrate heterojunction films for efficient solar cells. The novel and stable planar solar cells are fabricated using Spiro-OMeTAD as hole transporting material (HTM) and achieved a peak power conversion efficiency of 6.31% under AM 1.5 illumination at the optimized CuInS2 thickness of 200 nm and annealing temperature of 270 °C for CuInS2 formation. The efficiency is the highest among the CuInS2-based planar solar cells derived from molecular precursor methods; in particular, adopting HTM results in the open-circuit voltage up to 0.78 V, much higher than that of the similar devices without HTM. Our results demonstrate a dual nature of excitonic and nonexcitonic charge generation mechanisms in such solar cells. A depletion-field-assisted homojunction-interfacial charge transfer model is proposed to explain the generation and transfer of free charge carriers in the CuInS2 nanoparticle films, and the total charge generation in the TiO2/CdS/CuInS2 solar cells gets well elucidated from the model in combination with excitonic feature. Moreover, the CdS layer is found to act as an effective interfacial spacer to prevent the charge carriers generated upon CuInS2 absorption from recombination.
研究领域:
材料科学
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能源技术
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光电子学
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产品关联
DOI
ACS Applied Nano Materials
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2022
·
IF 6.14
Jundiao Wang,Haoran Ning,Jun Wang,Stephen V. Kershaw,Lihong Jing,Pan Xiao
Semiconductor quantum dots (QDs) are promising materials for stress/strain sensing applications owing to their pressure-dependent photoluminescence (PL) and nanoscale size, while the impact of stress and microstructure on their optical properties still awaits in-depth investigations under more realistic loading conditions. Herein, bare CuInS2 QDs and core–shell structured CuInS2/ZnS QDs are investigated under repetitive pressure loadings to elucidate the pressure-dependent PL responses over many pressure cycles. The CuInS2/ZnS QDs not only show higher PL intensity but also exhibit a reliable and simple relationship between PL emission peak energy (EPL) and external pressure (P), which is desirable for actual application in stress/strain sensing. Specifically, the EPL–P relationship of bare CuInS2 QDs changes after the first loading–unloading cycle, while the EPL–P relationship of CuInS2/ZnS QDs shows repeatable trajectories under different cycles. This research provides experimental support for designing QD-based stress/strain sensing materials and explains how the shell and surface microstructure will affect the mechanical-luminescence responses of QDs.
研究领域:
材料科学
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纳米技术
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光电
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传感器
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Qi Wang,Lanlan Zhang,Yuhong He,Zonghan Hu,Yangfang Liao,Qingping Dai,Bing Lv,Wenzhong Wang
Rational design and construction of semiconductor heterojunction photoelectrode can effectively improve photoelectrochemical (PEC) water splitting for hydrogen evolution . In this study, for the first time, a novel n-type Fe 2 V 4 O 13 (FVO) nanoparticle-modified p-type CuInS 2 (CIS) nanosheet arrays (NSAs) photocathode is designed and constructed for hydrogen evolution through PEC cell . The CIS/FVO NSAs photocathode simultaneously with type II heterojunction and p-n junction was constructed by growing FVO nanoparticles (NPs) on CIS NSAs through a facile successive ionic layer adsorption and reaction (SILAR) as well as annealing method. The designed and constructed CIS/FVO NSAs photocathode exhibited drastically improved PEC water splitting for hydrogen evolution and generated a photocurrent of −4.8 mA/cm 2 , 9.5 times that of pristine CIS NSAs photocathode at −1.0 V vs. Ag/AgCl. UV–vis absorption spectrum tests demonstrated the outstanding light absorption of CIS/FVO NSAs within the wavelength of 300–800 nm. Electrochemical impedance and photoluminescence measurements evidenced the effective separation of the carriers within the CIS/FVO NSAs. Mott-Schottky tests confirmed the establishment of type II heterojunction between the interface of p-type CIS and n-type FVO. The experimental tests revealed that the enhanced PEC water splitting performance of the CIS/FVO NSAs photocathode is attributed to the outstanding light absorption and the effective charge carrier separation achieved by type II heterojunction and p-n junction. This work provides a new strategy to design and construct CIS-based photocathode for highly efficient PEC water splitting hydrogen evolution.
研究领域:
材料科学
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能源科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wei Bi,Ling Zhang,Hao Jiang,Chunzhong Li,Yanjie Hu
The precise regulation of the nano-catalyst structure is a big challenge that limits the application of photocatalytic technology in CO 2 reduction. Herein, to improve the utilization of sunlight, the separation and transfer efficiency of photogenerated electron-hole pairs, and the surface catalytic reaction process, CuInS 2 /C/TiO 2 (CIS/C/T) hierarchical tandem heterostructure have been rationally designed. Multiple in-situ characterizations and DFT simulations show that CQDs not only act as a co-catalyst, but also act as a bridge between TiO 2 (T) and CuInS 2 (CIS), which further attribute to the efficient separation and enrichment of photogenerated electron-hole pairs while effectively avoiding the recombination. In consideration of the excellent broad-spectrum absorption, the CO 2 -to-CO photoreduction performance of the optimal CIS/C/T reaches up to 7.73 μmol g -1 h −1 , about 3.16 times enhancement of C/T. Combined with in-situ DRIFTs, the intrinsic structure–activity relationship is pointed out, and extended to other similar TiO 2 -based catalytic systems (In 2 S 3 /C/TiO 2 ). This work will provide a new universal strategy for the design and synthesis of high-performance nano-photocatalysts.
研究领域:
光催化
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材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
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2024
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IF 6.5
Peng-Fei Guo,Le-Yan Li,Hang Xu,Bin Zhao
The self-coupling reaction of primary amines is an efficient method for obtaining imines, which are important components in the organic synthesis of medicines, pesticides, and fine chemical products. However, this reaction often requires the utilization of noble metals as catalysts to achieve high yields. Therefore, it is both desirable and challenging to explore efficient noble-metal-free catalysts. In this study, a composite catalyst of CuInS 2 / C with a regular octahedral shape and porous framework was synthesized using the HKUST-1 as precursor. The CuInS 2 / C catalyst exhibited effective catalytic activity in the self-coupling synthesis of imines under mild conditions, achieving a turnover frequency (TOF) of 105 h −1 , which surpasses other non-noble metal catalysts. Mechanism investigations revealed that the excellent catalytic performance of CuInS 2 / C was attributed to its Cu(I) center and porous structure. The former generates radicals, while the latter enhances the transport of substrates and products, facilitating imine synthesis. Importantly, the CuInS 2 / C catalyst could be reused at least four times and applied in gram-scale experiments, demonstrating promising practical applications. This research presents a direct approach to developing noble-metal-free and highly efficient composite catalysts for imine synthesis using MOFs as precursors.
研究领域:
催化
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有机化学
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材料科学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-9
·
IF 5.479
Liu Chao,Zhao Li,Liang Dongxia,Zhang Xiaoru,Song Weiling
A photocathode is described for the determination of microRNA-21 by using CuInS 2 as an active photocathode material. Exonuclease III assisted target recycling amplification was employed to enhance the detection sensitivity. The TATA-binding protein (TBP) was applied to enhance steric hindrance which decreases the photoelectrochemical intensity. This strategy is designed by combining the anti-interference photocathode material, enzyme assisted target recycling amplification and TBP induced signal off, showing remarkable amplification efficiency. Under the optimized conditions, the detection limit for microRNA-21 is as low as 0.47 fM, and a linear range was got from 1.0 × 10 −15 M to 1.0 × 10 −6 M.
Schematic representation of sensitive photoelectrochemical detection of microRNA-21.CuInS 2 is used as an active photocathode material. Combined Exonuclease III assisted target recycling amplification and TATA-binding protein decreased of photoelectrochemical intensity, the detection limit was 0.47 fM with good selectivity. (miR-21: microRNA-21; CS: chitosan).
研究领域:
生物化学
·
分析化学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）