Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 6
·1561-1571
·
IF 4.204
Quan Huiying,Qian Kejiang,Xuan Ying,Lou Lan-Lan,Yu Kai,Liu Shuangxi
It is of broad interest to develop emerging photocatalysts with excellent light-harvesting capacity and high charge carrier separation efficiency for visible light photocatalytic hydrogen evolution reaction. However, achieving satisfying hydrogen evolution efficiency under noble metal-free conditions remains challenging. In this study, we demonstrate the fabrication of three-dimensionally ordered macroporous SrTiO3 decorated with Zn x Cd 1 − x S nanoparticles for hydrogen production under visible light irradiation (λ > 420 nm). Synergetic enhancement of photocatalytic activity is achieved by the slow photon effect and improved separation efficiency of photogenerated charge carriers. The obtained composites could afford very high hydrogen production efficiencies up to 19.67 mmol·g −1 ·h −1 , with an apparent quantum efficiency of 35.9% at 420 nm, which is 4.2 and 23.9 times higher than those of pure Zn0.5Cd0.5S (4.67 mmol·g −1 ·h −1 ) and CdS (0.82 mmol·g −1 ·h −1 ), respectively. In particular, under Pt-free conditions, an attractive hydrogen production rate (3.23 mmol·g −1 ·h −1 ) was achieved, providing a low-cost and high-efficiency strategy to produce hydrogen from water splitting. Moreover, the composites showed excellent stability, and no obvious loss in activity was observed after five cycling tests.
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Xiang Luo,Xunyi Zhou,Song Wei
Inorganic quantum dot films possess outstanding optical and electrical properties, which are promising in the fields of temperature sensors, thin film transistors, photodetectors, and quantum dot light-emitting diodes (QLEDs). In this paper, high-performance Ag-doped Zn x Cd 1−x S quantum dot films with full-color emission were prepared by a facile and environmentally friendly ionic liquid-assisted approach successfully. The ionic liquid solvent which plays a critical role in the preparation process was formed by the addition of n-butylammonium and n-butylamine in methanol. The n-butylammonium butyrate ionic liquid is low-temperature thermally degradable and can be easily removed from the final quantum dot films by a sintering process. The emitting color of Ag-doped Zn x Cd 1−x S quantum dot films can be easily tuned by changing the contents of Ag, Zn, and Cd in the films. The final as-prepared Ag-doped Zn x Cd 1−x S quantum dot films exhibit the high performance of full-color emission, simple process, and low preparation cost. This work will provide a new strategy to prepare high-performance photoelectric devices with a facile ionic liquid-assisted green solution approach.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Sheng Zhao,Jing Xu,Min Mao,Lingjiao Li,Xuanhao Li
Based on hollow spherical NiCo 2 S 4 , Zn x Cd 1-x S with adjustable band structure was used to construct a composite for photocatalytic hydrogen evolution. The hollow spherical structure of NiCo 2 S 4 gives Zn x Cd 1-x S more contact positions to form a stable heterojunction. Through the band structure adjustment for Zn x Cd 1-x S, the induced electron transfer model was transformed into Z-scheme, which effectively enhances the photo-produced carrier separation efficiency of the composite material. At the same time, the fast electron transfer is realized by the great conductivity of the hollow spherical NiCo 2 S 4. This allows the composite material to obtain a shorter average lifetime of PL (0.15 ns) compared to Zn 0.5 Cd 0.5 S (3.9 ns). The composite NiCo 2 S 4 @Zn 0.5 Cd 0.5 S with Z-scheme heterojunction exhibited excellent photocatalytic HER activity and stability due to its unique spatial structure and efficient Z-scheme electron transfer path. The optimized composite NiCo 2 S 4 @Zn 0.5 Cd 0.5 S 1:1 photocatalytic HER rate reached 233.68 μmol . h −1 , which is equivalent to 5.81 times that of Zn 0.5 Cd 0.5 S (40.25 μmol . h −1 ).
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Mengli Zhao,Wanni Wang,Chenxi Huang,Wang Dong,Yang Wang,Sheng Cheng,Huiqing Wang,Haisheng Qian
Photocatalysis driven by near-infrared (NIR) light is of scientific and technological interest for exploiting solar energy. In this study, we demonstrate a facile hydrothermal process to synthesize core-shell nanoparticles combining upconversion nanoparticles (UCNPs) and alloyed Zn x Cd 1- x S, which can be excited using NIR or visible light. Morphologies, phase, and chemical composition have been investigated using field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction analysis, and atomic absorption spectroscopy. Moreover, we found that amorphous TiO 2 layers existing in the final samples play an important role in formation of UCNPs@Zn x Cd 1- x S yolk-shell nanoparticles, which bind the as-prepared Zn x Cd 1- x S nanoparticles tightly to form yolk-shell nanoparticles. The chemical composition of alloyed Zn x Cd 1- x S can be tunable by adjusting the amount of the Cd and Zn source compounds. The photochemical reduction of Cr(VI) in water has been performed to study the photocatalytic performance under irradiation by NIR light or a simulated solar light, showing efficient photoreduction and Cr(VI) removal over the as-prepared UCNPs@Zn x Cd 1- x S/TiO 2 yolk-shell nanoparticles. The as-prepared UCNPs@Zn x Cd 1- x S/TiO 2 nanoparticles show excellent production of hydroxyl radicals, which are responsible for the photochemical reduction of Cr(VI) to Cr(III). This study will provide an alternative strategy for environmental wastewater treatment , making full use of solar energy.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Jingjing Shi,Ibrahim Ul Islam,Wenpeng Chen,Fengming Wang,Zhiyuan Xu,Shihong Xu,Yanmei Li,Jun Lu
Two-dimensional ultrathin Zn x Cd 1-x S nanosheet was fabricated by topotactic sulfurization process using trimetallic ZnCdAl layered double hydroxides (LDHs) as precursor and thiourea as sulfur source. A series of characterizations were conducted to investigate the structure and properties of Zn x Cd 1-x S nanosheet. The band gap engineering of Zn x Cd 1-x S nanosheet can be tuned by the composition of LDH precursor, keeping balance between photo-absorption ability and flat band potential. Zn x Cd 1-x S nanosheet possessed exposed (111)ZB or (002)WZ polar facet. Zn 0.67 Cd 0.33 S nanosheet displayed not only the highest photocatalytic hydrogen-generation activity under visible light irradiation (6.69 mmol h −1 g −1 ) without cocatalyst , but also outstanding stability after several cycles. In spite of the poor surface area of the nanosheet, it can be concluded that the carrier separation and transport rate of Zn x Cd 1-x S nanosheet significantly enhanced, rendering photogenerated carriers transport across the polar facet. This can be attributed to the photogenerated electron/hole exclusively delocalized distributed on the metal/sulfur ions, respectively. This work presents a strategy to fabricate highly efficient Zn x Cd 1-x S nanosheet from LDH precursor, which is a simple, low-cost and environmentally friendly process.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xianglong Meng,Zhoujie Yu,Kaiwei Liu,Jian Tian,Yu Xie,Debin Zeng,Changlin Yu
Photocatalysis represents one of the green and low-cost pathways for producing high-value-added industrial products such as H 2 O 2 . However, the primary challenges facing this technology include low H 2 O 2 synthesis rates, susceptibility of H 2 O 2 to oxidation by holes, and prone decomposition of H 2 O 2 . Here, we propose a synergistic strategy combining oxygen reduction reaction (ORR) and water oxidation (WOR) to overcome the bottleneck of low H 2 O 2 synthesis rate by simultaneously driving efficient desorption of H 2 O 2 from the catalytic site, thus suppressing its oxidation and decomposition. Specifically, we first synthesized Zn-doped CdS (Zn x Cd 1-x S) via hydrothermal method. Hydrothermal carbonation carbon (HTCC) was then loaded onto the Zn x Cd 1-x S, forming a Zn x Cd 1-x S/HTCC heterojunction with a built-in electric field effect. Zn doping and the built-in electric field enhance the separation of photo-generated carriers, effectively ensuring the supply of electrons and holes required for the 2e − ORR and 4e − WOR. Concurrently, the abundant hydrogen atoms in HTCC enhance O 2 adsorption and activation, thereby promoting the 2e − ORR process. Furthermore, the Zn x Cd 1-x S/HTCC structure efficiently drives H 2 O 2 desorption, thereby suppressing H 2 O 2 decomposition dominated by hole-mediated mechanisms. In a pure water system, the photocatalytic H 2 O 2 production rate of Zn 0.08 Cd 0.92 S/HTCC (ZCS/HTCC) reached 2061 μmol g cat −1 h −1 . Moreover, the Zn x Cd 1-x S/HTCC can be combined with commercial titanium silicalite-1 to establish an effective tandem system by coupling photocatalytic in situ H 2 O 2 production and propylene epoxidation to produce epoxypropane (PO). A distinct (969 μmol g cat −1 h −1 ) and highly selective (>90%) production of PO was achieved using O 2 under visible light irradiation. It offers a novel strategy for not only utilizing solar energy, but also enabling the safe and green production of PO under mild natural condition.
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Yuhui Liu,Mengxin Liu,Chen Lin,Xinan Shi,Daocheng Pan
Colloidal quantum dot light-emitting diodes (QLEDs) typically rely on ZnO-based electron transport layers (ETLs), which often suffer from excessive electron injection and an undesirable positive aging effect. Herein, we demonstrate a new class of ZnxCd1–xS alloy nanocrystals as bandgap- and mobility-tunable ETLs for inverted QLEDs. By varying the Zn/Cd ratio, the optical bandgap of the ZnxCd1–xS nanocrystals can be continuously tuned from 2.52 to 3.85 eV, enabling precise alignment of the conduction band minimum with the quantum dot emissive layer. Furthermore, an in situ ligand exchange with 3-mercaptopropionic acid (MPA) is employed to replace the long-chain insulating oleylamine ligand, significantly enhancing the film conductivity by nearly 2 orders of magnitude. MPA-treated Zn0.1Cd0.9S-based QLED achieves a maximum external quantum efficiency of 16.4% and a peak luminance of 139,937 cd m–2, representing an ∼93% enhancement over the untreated device. This work establishes composition- and ligand-engineered ZnxCd1–xS alloy nanocrystals as versatile and efficient ETL platforms for next-generation QLEDs.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 9
·5717-5729
·
IF 4.22
Lu Lili,Ma Yongjin,Dong Rui,Tan Pengfei,Chen Yi,Pan Jun
A series of Zn x Cd 1−x S solid solutions were synthesized through a simple one-step chemical bath co-precipitation route. The microstructure, morphology, composition and optical properties had been thoroughly investigated. The results showed that the as-obtained Zn x Cd 1−x S samples exhibited monodisperse spherical feature. These monodisperse Zn x Cd 1−x S spheres were composed of a large number of 5–10 nm crystal grains. The chemical composition of the Zn x Cd 1−x S solid solutions can be controlled by adjusting the ratio of Zn source to Cd source and the dosage of ammonia solution. Meanwhile, the energy band structure and photocatalytic properties can be optimized. The photocatalysis experiment results revealed that the as-synthesized Zn 0.30 Cd 0.70 S sample exhibited optimum water splitting performance. The satisfactory hydrogen evolution rate (HER) of Zn 0.30 Cd 0.70 S reached 27.004 mmol g −1 h −1 even without any cocatalysts, which was more than 48 times that of pure CdS (0.561 mmol g −1 h −1 ). This enhancing effect can owe to the balance between light absorption capacity and redox potential caused by the incorporation of Zn in the Zn x Cd 1−x S solid solutions.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Hui-Fang Ye,Rui Shi,Xiao Yang,Wen-Fu Fu,Yong Chen
Photocatalytic water splitting over semiconductors without using of any electron sacrificial agents is essential to the conversion of solar energy into chemical energy. Herein, we report remarkable photocatalytic hydrogen production from pure water without the assistance of electron sacrificial agents by using P-doped Zn x Cd 1−x S with rich S vacancies (Zn x Cd 1−x S-P) as the photocatalyst. It is found that interstitial P doping in Zn x Cd 1−x S solid solutions with rich S vacancies can prolong the lifetime of charge carriers and enhance the generation and separation of photogenerated electrons-holes, resulting in a H 2 evolution rate of up to 419 μmol h −1 g −1 , which is 72 and 7.5 times higher than those of ZnS-P (5.8 μmol h −1 g −1 ) and CdS-P (56 μmol h −1 g −1 ), respectively. Furthermore, the introduction of biomass-derived compound 5-hydroxymethylfurfural (HMF) into this system further promotes the photocatalytic hydorgen evolution reaction and simultaneously obtains value-added HMF oxidation products.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ran Wang,Zhiding Zheng,Zhuo Li,Xiaoxiang Xu
Photocatalytic C-C coupling is a green and sustainable route to produce value-added chemicals. However, the product selectivity is generally non-tunable and there is a lack of an in-depth understanding of the dependence of product selectivity on the band structure of the semiconductor photocatalyst. Here, Zn x Cd 1-x S solid solutions have been explored for photocatalytic C-C coupling using benzyl alcohol as a typical reactant. The conversion rate of benzyl alcohol and selectivity of C-C coupling products is inherently linked to the solid solution level of Zn x Cd 1-x S which can be readily tuned. An optimal solid solution level has been found at Zn 0.6 Cd 0.4 S (x = 0.6) which delivers a conversion rate of 91.61% and a selectivity of 98.83% for C-C coupling products. These findings not only deepen the understanding on factors that affect product selectivity but also justify the usefulness of solid solutions in tuning the C-C coupling reactions.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Linjuan Wang,Ling Zan
Industrial wastewater containing heavy metal ions can cover the full pH range according to the manufacturing process. Alkaline wastewater treatment is still a great challenge because Cr 6+ therein has a more negative reduction potential (Cr 2 O 7 2− + 14H + + 6e − = 2Cr 3+ + 7H 2 O (E Cr 6+ (Cr2O7 2− /Cr 3+ ) = E θ − RT nF ln [ OH ] − ) than in acid solution, in which it can be easily reduced by numerous reagents. In this study, weakly alkaline Cr 6+ solution has been used to simulate weakly alkaline industrial wastewater, and a reagent capable of excellent reduction efficiency therein has been developed. A series of band-gap-energy-adjustable NiS-Zn x Cd 1- x S composites has been synthesized by a one-pot hydrothermal method . A more negative conduction band position for Zn x Cd 1- x S has been achieved by doping and changing the amount of Zn 2+ ions to ensure a superior photoreduction ability. All modified samples show excellent photocatalytic efficiency. For example, the reduction efficiency of 10%NiS–Zn 0.25 Cd 0.75 S sample is threefold higher than that of Zn 0.25 Cd 0.75 S and sixfold higher than that of CdS when deployed at a catalytic level for 30 min. Multiple characterization methods have been applied, and the results show that the improved efficiency can be ascribed to intimate contact between Zn 0.25 Cd 0.75 S and NiS. Photoluminescence (PL) and photocurrent measurements and electrochemical impedance spectroscopy (EIS) further elucidate the catalytic mechanism and imply an enhanced charge-carrier separation efficiency between Zn 0.25 Cd 0.75 S and NiS.
✓ 已验证
产品关联
DOI
高影响因子
Materials Horizons
·
2023
·Vol. 11
·期 3
·768-780
·
IF 13.3
Guiyang Yu,Ke Gong,Xiang Li,Luyang Guo,Xiyou Li,Debao Wang
The achievement of dual-functional photocatalytic technology requires a photocatalyst with accelerated charge flow and purposeful active-site arrangement. In this study, we developed an oriented embedding strategy to induce ReS2 growth at the S vacancy in twin-crystal Zn0.5Cd0.5S solid solution (Sv-ZCS), obtaining an atomic-level heterostructure (ReS2/Sv-ZCS). The electronic structure calculations demonstrate that the charge density of the Zn atom around the S vacancy is higher than for other Zn atoms and the introduced S vacancy establishes a high-speed channel for electron transport via formed Zn–S–Re bonds at the interface between ReS2 and Sv-ZCS. Photogenerated electrons and holes gathered on Re atoms and Sv-ZCS, respectively, which achieves spatial charge separation and separated arrangement for redox sites. As a result, the optimized ReS2/Sv-ZCS heterostructure possesses high efficiency of electron injection (2.6-fold) and charge separation (8.44-fold), as well as excellent conductivity capability (20.16-fold). The photocatalytic performance of the ReS2/Sv-ZCS composite exhibits highly improved dual-functional activity with simultaneous H2 evolution and selective oxidation of benzyl alcohol. The reaction rate of benzaldehyde and H2 evolution reaches 125 mmol gcat−1 h−1 and 159 mmol gcat−1 h−1, which is the highest efficiency achieved so far for simultaneous coproduction of H2 fuel and organic chemicals on ReS2-based composites. This work enriches the application of ReS2-modified composites in a dual-functional photoredox system and also gives insight into the role of defects in electronic structure modification and activity improvement.
✓ 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）