JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wei Zhao,Jincheng Liu,Zhongxiang Ding,Jinhong Zhang,Xiaoyu Wang
CdS nanophotocatalysts generally require precious metal Pt as a cocatalyst to enhance photocatalytic hydrogen production performance, but precious metal Pt reserves are scarce and expensive. Therefore, this study hopes to prepare CdS/MoS 2 (CM) composites by uniformly distributing MoS 2 nanosheets on the surface of CdS nanowires by a two-step method. After a series of tests, CM composite can expand the absorption range of visible light and improve the separation and transmittance of photogenerated electrons and holes. The results show the highest hydrogen production rate of 1.79 mmol•g −1 •h −1 was obtained with the CdS/MoS 2 ratio of 0.3, which is 35.8 times that of bare CdS nanowires. The excessive MoS 2 nanosheets will block light adsorption of CdS and inhibit the hydrogen production performance of the CM composite. This study provides a new research direction for finding cheap cocatalysts to replace precious metal Pt.
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FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Mingyu Cui,Chong Liang,Wei Zhao,Xutang Liu,Linyang Dong,Dingkai Wang,Shuiyuan Fu,Zhijie Jiang,Fei Wang,Xianyong Wei
As the most abundant resource composed of aromatic groups in nature, lignin harbors significant potential for the production of bio-based fuels and chemicals. In recent years, solar-driven photocatalysis with its mild, low cost and environmental benign, has been employed for lignin depolymerization . Herein, we designed a Z -scheme CdS/H 5 PMo 10 V 2 O 40 /g-C 3 N 4 (CdS/HPA-2/CN) photocatalyst via hydrothermal method for the photocatalytic depolymerization of lignin. The prepared CdS/HPA-2/CN presents a nanoflower-like morphology with the average diameter of ∼600 nm. With the presence of electron-mediated HPA-2, CdS/HPA-2/CN exhibits the enhanced separation and transfer capacity of photogenerated charge carriers through Z -scheme mechanism. Result shows that the total yield ( Y ) of vanillin and vanillic acid from lignin depolymerization over optimized CdS/HPA-2/CN can reach to 32.7 mg/g lignin in DMF/formic acid ( v / v = 40/10) for 4 h. Reusability experiment of optimized CdS/HPA-2/CN displays that Y (26.5 mg/g lignin) can still reach to 81.0% of initial one after three cycles. Qualitative analysis of depolymerized products reveals that most components are aromatic compounds with the dominant products of vanillin and vanillic acid. Evidence also shows that photocatalysis promotes the reaction and small molecular products increased significantly after depolymerization. In addition, mechanism experiments and electron spin resonance tests exhibit that h + , ·O 2 − and ·OH took part in lignin depolymerization together and the effect sequence was ·O 2 − > ·OH > h + . In this work, as an electron mediator, HPA-2 provides the inspiration for construction of Z -scheme heterojunction , and CdS/HPA-2/CN exhibits enormous potential in lignin depolymerization by photocatalysis.
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高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 7
·2214-2221
·
IF 4.099
Qiang Wu,Juan Hou,Haifeng Zhao,Zhiyong Liu,Xuanyu Yue,Shanglong Peng,Haibin Cao
ZnS as an inorganic passivation agent has been proven to be effective in suppressing charge recombination and enhancing power conversion efficiency (PCE) in quantum dot-sensitized solar cells (QDSCs). In the present study, we constructed a novel TiO2/ZnS/CdS/ZnCdS/CdSe/ZnS photoelectrode via successive ionic layer adsorption and reaction (SILAR) and chemical bath deposition (CBD). The complementary effects of multi-ZnS layers on the optical and electrochemical performance of the QDSCs were systematically investigated. The multi-ZnS can not only facilitate the growth and distribution of QDs, but also suppress the different interface charge recombination effectively. We suggest that the formation of the ZnCdS intermediate layers via ion-exchange route during CBD process contributes to the higher photoelectrochemical cell performance of the QDSCs with the middle ZnS layer. When the three-layer ZnS was employed in CdS/CdSe co-sensitized system, the PCE reached 6.05%, which is much higher than that observed for solar cells with the conventional single ZnS treatments and the two layers inserted at the interface between CdS QDs and CdSe QDs and electrolyte (4.80% and 5.42%, respectively).
研究领域:
材料科学
·
纳米科技
·
光电子学
·
能源化学
·
半导体器件
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Kai Wang,Nini Zhao,Haiyan Xie,Jingzhi Wang,Wenli Xu,Zhiliang Jin
Improving the separation efficiency of semiconductor photogenerated carriers is an important way to enhance the photocatalytic activity of water splitting. To establish an efficient photocatalytic hydrogen production system, a practical method combining metal-like cocatalysts with semiconductors was designed. This article prepared Ni-CdS by modifying Prussian blue analogues and synthesized Ni-CdS/1T-WS 2 composite materials by low-temperature mixing with metal-like catalyst 1T-WS 2 . At the optimal load concentration, it can reach 62.65 mmol g -1 . Firstly, the close contact interface formed between the two enables rapid transfer of photo generated electrons . Secondly, metal-like cocatalysts have a strong attraction to the charges generated by light, forcing electron hole separation and exacerbating this effect under illumination. This has been strongly demonstrated through a series of characterizations and in-situ radiation X-ray photoelectron spectroscopy. In summary, this study provides a reliable and clear understanding for the modification of Prussian blue analogues and the regulation of photo induced charge transfer by metal-like cocatalysts.
研究领域:
材料科学
·
物理化学
·
能源催化
·
半导体光催化
·
纳米材料
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2017
·Vol. 123
·期 3
·189
·
IF 1.455
Lin Yibing,Lin Yu,Wu Jihuai,Zhang Xiaolong,Fang Biaopeng
The composite photoanodes based on the ZnO/SnO 2 hierarchical structures with high photoelectricity properties have been successfully synthesized, and used in the CdS and CdSe quantum dots co-sensitized solar cells (QDSSCs). In this experiment, the ZnO/SnO 2 nanoparticles (ZS-NP) and hierarchical nanosheets-based microflowers (ZS-MF) were prepared by the one-step hydrothermal route and the morphologies of the products were controlled by the solvent variation. An improved power conversion efficiency of 4.98% was achieved for the cell based on the ZS-MF composite photoanodes, which showed an increase of 21.8% compared to the ZS-NP photoanodes (4.09%). This result is mainly connected to the unique superiority of the three-dimensional hierarchical microflower nanostructures for light scattering and quantum dots loading, which is responsible for the increase of photocurrent values and eventual PCE.
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FUEL
·
2024
·
IF 6.7
Yao Wang,Tengyang Gao,Ruiting Li,Yan Chen,Wen Luo,Yang Wu,Yu Xie,Yong Wang,Yifan Zhang
Photocatalytic hydrogen production through water splitting is an appealing technology to alleviate the escalating fossil fuel energy crisis. The advancement of visible-light-driven hydrogen production systems is a crucial aspect of hydrogen research. In this study, we successfully synthesized a unique acorn leaf-like CdS/MoS 2 material via a hydrothermal method , with layered deposited MoS 2 nanosheets, for driving hydrogen generation under illumination. By systematically varying the sodium molybdate concentration, we looked into how the MoS 2 affected the optical properties and photocatalytic performance of the acorn-leaf-like CdS/MoS 2 . Under illumination, the photocatalytic hydrogen production performance of the acorn leaf-like CdS/MoS 2 reached 70.05 mmol·g −1 ·h −1 (at a catalyst dosage of 10 mg), which is approximately 330 times higher than the unmodified CdS original material. It was determined that the apparent quantum yield at 450 nm was 2.104 %, corresponding to a solar-to-hydrogen conversion efficiency of 9.383 %. Mechanistic investigations revealed that MoS 2 nanosheets function as co-catalysts and electron acceptors, effectively promoting electron transfer and the separation of photogenerated charge carriers from CdS, thereby consequently enhancing the kinetics of surface hydrogen evolution. This work offers valuable insights into the development of efficient photocatalysts with anti-photocorrosion properties for sustainable hydrogen production.
研究领域:
材料科学
·
光催化
·
可再生能源
·
纳米材料
·
氢气生产
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Muhammad Fasehullah,Feipeng Wang,Sidra Jamil
Synthetic ester (SE) oil-based nanofluids (NFs) are indispensable for high voltage (HV) applications due to their impressive properties; for instance, high biodegradability, environmental friendliness, high dielectric strength and thermal stability. In this work, the solvothermal route is adopted to synthesise cadmium sulfide (CdS) nanomaterials of three different morphologies. CdS nanoparticles (NPs) possess a zinc blende (cubic) phase; however, CdS nanobelts (NBs) and CdS ultra-thin nanosheets (NSs) exhibit a wurtzite (hexagonal) phase. Thereafter, CdS nano-additives are dispersed in SE oil (MIDEL-7131) to investigate the influence of phase, morphology and bandgap of nano-additives on the AC breakdown characteristics of nanofluids. The resultant NFs exhibit significantly augmented AC breakdown strength because of expedited charge scavenging ability due to high bandgap and the formation of an electrical double layer (EDL). NPs based nanofluid (SE/NPs), NBs based nanofluid (SE/NBs), and NSs based nanofluid (SE/NSs) display their optimum doping concentration of 0.3 g/L, 0.3 g/L, and 0.2 g/L, respectively. Furthermore, the thermal stability of NFs of optimum doping concentration is investigated and compared with SE via TGA/DSC/DTG technique. The findings evince that the initial decomposition temperature is high and heat dissipation is low in NFs compared to SE, which indicates that the nanofluids are thermally stable both in air and nitrogen. Finally, the kinematic viscosity measurements of NFs of optimum doping concentration exhibit slightly lower viscosity than that of SE. Hence, CdS nano-additive is proved to be a magnificent potential aspirant which is highly efficient for insulating oil-based NFs development without any surfactant.
研究领域:
电气工程
·
材料科学
·
纳米技术
·
高压工程
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SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Kai Zhang,Ge Song,Yinfeng Li,Xianli Wu,Kunjing Li,Baoxian Ye
A facile and highly sensitive electrochemical sensor for kaempferol was fabricated by doping polyvinyl pyrrolidone cladding quantum dots to the carbon paste electrode. The quantum dots were characterized with transmission electron microscopy , ultraviolet spectrum and infrared spectrum. The electrochemical behaviors and kinetic parameters of kaempferol were investigated on the sensor by cyclic voltammetry and chronocoulometry in NaAc–HAc (pH 4.4). The proposed sensor accelerated the redox processes of kaempferol obviously, and the oxidation currents were linearly relationship with kaempferol in two concentration intervals: one was 6.0 × 10 −8 –2 × 10 −6 mol/L and the other was 5.0 × 10 −6 –2.5 × 10 −5 mol/L. The quantification limit obtained by square wave voltammetry was 6.0 × 10 −8 mol/L. Merits such as extreme simplicity, low cost, good sensitivity, high sensitivity, good stability and reproducibility made it an excellent electrochemical sensor for kaempferol. A new electroanalytical method for kaempferol was proposed and used for determination of kaempferol in tablets with satisfactory results.
研究领域:
分析化学
·
电化学
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高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.1
Lanlan Wei,Yilan Zhao,Yaoye Chen,Ke Huang,Xiaoli Xiong,Qing Yang
A dual-emission CDs@Eu-DPA composite was rapidly synthesized via dielectric barrier discharge microplasma technology using carbon dots (CDs), 2,6-dipicolinic acid (DPA), and Eu 3+ as precursors. CDs@Eu-DPA was subsequently applied for ratiometric fluorescence and visual analysis of oxytetracycline (OTC) in food samples. When OTC was introduced, the blue fluorescence of CDs was quenched via the inner filter effect, while OTC coordinated with Eu 3+ in Eu-DPA to form a complex, leading to the enhancement of the red fluorescence of Eu 3+ at 615 nm through antenna effect. Additionally, principal component analysis was employed to distinguish four different antibiotics, including OTC, chlortetracycline, tetracycline, and doxycycline. Under optimized conditions, the ratiometric fluorescence analysis and smartphone-assisted RGB analysis exhibited linear detection ranges of 0.05–210.0 μM and 0.3–90.0 μM for OTC, respectively, with limits of detection of 0.02 μM and 0.08 μM, respectively. The satisfactory recoveries in food samples were ultimately achieved through the dual-mode sensing method.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Yiao Xu,Xingtai Chen,Yujun Guo,Jiayi Qu,Changsheng Ji,Davoud Dastan,Zhigang Li,Xiaoming Tan,Feifei Wang,Xiaoning Wang,Xi-Tao Yin
First report of Ce-doped CdS nanomaterials as n-butanol sensors. • Sensor exhibits a maximum response value of 224.2 at 50 ppm n-butanol. • Sensor demonstrates extremely fast response/recovery times for n-butanol. • Sensor exhibits excellent selectivity toward n-butanol. • Possesses outstanding long-term stability. Ce-doped CdS nanomaterials were successfully synthesized by a hydrothermal method. Various characterization techniques confirmed the successful substitution of Cd sites in the CdS lattice by Ce ions. Gas-sensing tests demonstrated that at an optimal Ce doping level of 1 at%, the sensor exhibited an outstanding response of 224.2–50 ppm n-butanol at 175 ℃, which is approximately 3.5 times higher than that of pristine CdS. Meanwhile, it displayed excellent response/recovery characteristics (14 s/10 s). Furthermore, the sensor showed superior selectivity toward n-butanol, with a negligible response to benzene gas. Mechanism analysis revealed that the abundant sulfur vacancies induced by Ce doping, along with the multivalent redox catalytic effect of Ce ions, are the key factors contributing to the significant enhancement of gas-sensing performance. Download: Download high-res image (142KB) Download: Download full-size image
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Zhepeng Zhang,Ruiyun Zhou,Chen Wang,Jiangbo Li,Heera Jayan,Xiaobo Zou,Zhiming Guo
Enhanced R-CDs@Pr-MOF nanocomposite-embedded electrospun film was developed. • A superior hierarchical sensing system through lanthanide MOF medicated R-CDs. • Multifunctional Pr-MOF filler improved physical properties of packaging film. • Smartphone-assisted monitoring platform with self-developed APP was developed. • The S RGB of spinning film showed an excellent correlation with quality parameters. Fluorescent carbon dots (CDs)-based stimuli-responsive materials exhibited considerable promise for real-time monitoring of food quality and safety, but their poor stability and reliance on single-color changes have limited their broader application. Herein, red-emitting CDs (R-CDs) were immobilized onto Pr-based metal-organic framework (Pr-MOF) through electrostatic interactions. The Pr-MOF served as an adsorption scaffold for R-CDs while also contributing to the enhanced fluorescence responsiveness of the composite. Afterward, the R-CDs@Pr-MOF nanomaterial was incorporated into a blended matrix of polyvinylidene fluoride (PVDF) and polyvinylpyrrolidone (PVP) to fabricate spinning film responsive to sulfur-based gases. The incorporation of R-CDs@Pr-MOF into the PVDF/PVP matrix moderately improved the water resistance while enhancing the mechanical properties and thermal stability of the film. Importantly, the film exhibits a clear multicolor evolution in response to analyte, effectively overcoming the single-color limitation. The MOF effectively also mitigates the comprehensive performance deficiencies of R-CDs in the packaging film. Finally, a linear correlation equation between the S RGB -value of the MOFs-based film and the quality parameters of packaged durian was established using a self-developed APP (Optimal group equation: y = (0.101 ± 0.002) x + (32.365 ± 0.753); R 2 = 0.9924; LOD: 0.086–0.836; RSD: 1.91%). Hence, utilizing digital sensing platform in conjunction with dual-channel light response mode, a powerful approach for the rapid assessment of multiple quality parameters of packaged fruits was developed. Moreover, the R-CDs@Pr-MOF material facilitates accurate and non-invasive monitoring of fruit freshness, enhancing the precision and safety of intelligent packaging systems. Download: Download high-res image (569KB) Download: Download full-size image
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ACS Applied Nano Materials
·
2026
·Vol. 9
·期 33
·15716-15726
·
IF 5.8
Tan Yulin,He Yanfang,Yang Ying,Zhang Huimin,Xie Yufang,Zhang Chenglin,Liu Yuan,Chen Mingming,Zhu Yefeng,Cao Dawei
Nanocatalysts
hold broad application prospects for photocatalytic
hydrogen evolution. CdS is a visible-light-responsive photocatalyst
for hydrogen evolution, but its efficiency is limited by fast electron–hole
recombination and insufficient interfacial charge extraction at the
nanoscale. Here, a nanoscale type-II BaTiO 3 /CdS (BTO/CdS)
heterojunction was constructed through a chemical bath deposition
process to introduce a built-in electric field (BIEF) at the oxide/sulfide
interface. The Fermi-level mismatch between BTO and CdS nanostructures
induces interfacial charge redistribution, forming a BIEF directed
from BTO to CdS. Under light irradiation, this field drives photogenerated
electrons from CdS toward BTO, thereby suppressing charge recombination
and improving electron utilization for hydrogen evolution. The optimized
BTO/CdS composite delivers a hydrogen evolution rate of 5.23 mmol·g –1 ·h –1 under simulated sunlight,
which is 5.5 and 40.2 times higher than those of pure CdS (0.95 mmol·g –1 ·h –1 ) and BTO (0.13 mmol·g –1 ·h –1 ), respectively. X-ray
photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy
(UPS), density functional theory (DFT) calculations, and Kelvin probe
force microscopy (KPFM) consistently support the BIEF-directed charge
transfer pathway. This study clarifies how interfacial electric-field
engineering in BTO/CdS nanostructures promotes directional electron
extraction and improves CdS-based photocatalytic hydrogen evolution.
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