NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 8
·6675-6685
·
IF 3.277
Xuehua Yin,Pengtao Sheng,Fenfen Zhong,VanManh Nguyen,Qingyun Cai,Craig Grimes
We describe the synthesis and application of a three-dimensional (3D) CdS quantum dot/ZnIn2S4 nanosheet/TiO2 nanotube array (CdS/ZnIn2S4/TiO2) heterostructured material architecture. TiO2 nanotube arrays (TiO2 NTAs) are used as the synthetic template, subsequently sensitized using hydrothermal and successive ion layer adsorption and reaction (SILAR) techniques. The described synthesis approach offers a powerful technique in the design of 3D heterostructure systems. Under AM1.5G illumination, the 3D CdS/ZnIn2S4/TiO2 samples generate a photocurrent of approximately 4.3 mA cm−2, with a photoconversion efficiency of 2%. Samples are tested for their ability to photocatalytically degrade target agents; it is noteworthy that after 90 min illumination 100% of 2,4-dichlorophenoxyacetic acid (2,4-D) is removed.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Cunxin Wei,Dongyuan Miao,Zhihe Xie,Bin Zhang,Huiping Qi,Yan Liu
A uniformly distributed photocatalytic composite material CdS-Sn 3 O 4 heterojunction was constructed. Mixed valence tin oxide Sn 3 O 4 was selected as a co-catalyst to improve the stability and photocatalytic activity of the composite because Sn 3 O 4 possesses adjustable band gap and matches well with the CdS band position. The characterizations of EDS and XPS proved that Sn 3 O 4 was successfully loaded on CdS. The composite material exhibits an excellent band gap of 2.25 eV, a high photo-generated current intensity and good photoluminescence properties. Due to the timely transfer of photo-generated electrons from CdS material to Sn 3 O 4 , the recombination of electron and hole is reduced, resulting in significant increase of photocurrent density and photocatalytic efficiency. The photocatalytic degradation experiments show that CdS-Sn 3 O 4 possesses a significant degradation effect on antibiotics norfloxacin and tetracycline. Simultaneously, it also exhibits certain degradation effects on organic dye pollutants methylene blue and Rhodamine B. The active substances analysis shows that H 2 O 2 and hole (h + ) are the main active substances. Composite CdS-Sn 3 O 4 still maintains a stable structure and good photocatalytic activity after several photocatalysis cycles. In brief, this heterojunction material is promising in water treatment and environmental protection.
研究领域:
材料科学
·
环境化学
·
光催化
·
纳米复合材料
·
水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 12
·11619-11626
·
IF 2.195
Zeng Bin,Xia Qiuying,Zeng Wujun
A photocatalyst consisting of graphene/iodine doped CdS nanoplates (G/I-CdS NP) was fabricated using a microwave method. The phase structure, surface morphology, and optical bandgap were analyzed using X-ray diffractometry, photoluminescence spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, emission scanning electron microscopy, and transmission electron microscopy. Excellent photocatalytic performance was demonstrated based on the degradation of methylene orange (MO) under visible light irradiation. Therefore, doping of iodine in CdS nanoplates resulted in a bandgap reduction. The coupling of CdS with graphene could effectively suppress the recombination of light-induced electron–hole pairs. As a result, an excellent synergetic effect could be achieved for improved photocatalytic performance. These findings will have a positive impact on the use of metal sulfides for future environment-related applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Shaolong Wu,Liujing Li,Linling Qin,Zhongyuan Zhou
Si-based heterojunctions have been intensively employed to reduce the large overpotential of Si single-absorber photoelectrodes in the field of photoelectrochemical (PEC) water splitting, but achievement of high-quality heterojunctions with an appropriate bandgap on the Si nanostructure host remains a great challenge. Herein, the p-Si/n-CdS core/shell nanowire heterojunction photocathode has been achieved by a combination of nanosphere lithography, metal-assisted chemical etching, atomic layer deposition , and chemical bath deposition. Compared to the bare Si nanowire photocathode , the overpotential maintaining a photocurrent density of 10 mA cm −2 for the optimized p-Si/n-CdS core/shell nanowire heterojunction photocathode under AM 1.5G illumination is reduced by 0.93 V, and simultaneously the saturated photocurrent density is increased by 4.4 mA cm −2 . Analyses indicate that the introduced CdS shell can greatly facilitate the separation and transfer of the photogenerated carriers , as well as partly enhancing the optical absorption .
研究领域:
材料科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2023
·Vol. 7
·期 14
·2300259
·
IF 7.9
Lianqing Yu,Xiang Li,Lijie Duan,Yaping Zhang,Haifeng Zhu
Owing to great efficient routes for charge carrier separation and transfer, heterostructure photocatalysts play significant roles in many photocatalytic reactions. Based on the bionic structure, an interesting composite photocatalyst of cadmium sulfide dewdrops on ultrathin strontium titanate branches with oxygen vacancies is successfully constructed by a simple chemical bath deposition method. The oxygen vacancies act as electron traps in the dendritic perovskite SrTiO 3 nanostructure. Meanwhile, the CdS can provide abundant active sites for the hydrogen evolution reaction. The results demonstrate that SrTiO 3 /CdS-5% nanocomposite with oxygen vacancies achieves the highest hydrogen production rate of 4537.9 μmol g −1 h −1 under visible light, which is over 50 times more than that of the single SrTiO 3 with oxygen vacancies (79.36 μmol g −1 h −1 ), pure CdS (81.79 μmol g −1 h −1 ), and more than 750 times that of pure SrTiO 3 (6.132 μmol g −1 h −1 ). Density generalized function theory calculations show that the bandgap values of SrTiO 3 /CdS nanocomposite with oxygen vacancies are narrower than that of the original SrTiO 3 and CdS, in which the electrons flow from CdS to SrTiO 3 , and form an internal electric field at the interface, prolonging the carrier lifetime. Importantly, this work provides a reasonable reference for the preparation of efficient structure-based biomimetic composite photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 59
·15930-15936
·
IF 5.16
Xue-Li Zhai,Jiang Liu,Ling-Yun Hu,Jian-Chun Bao,Ya-Qian Lan
Graphical Synergy in action . A novel polyoxometalate-decorated g-C 3 N 4 -wrapping snowflake-like CdS nanocrystal photocatalyst, by virtue of the synergistic effect stemming from the integration of the individual advantages of CdS, g-C 3 N 4 , polypyrrole, and the polyoxometalate Ni 4 (PW 9 ) 2 , displays high-performance hydrogen production activity and superior photocatalytic stability (see figure). Photocatalytic hydrogen evolution technology is recognized as a promising approach to relieving the growing energy crisis. Therefore, the development of a stable high-performance photocatalyst has long been the focus of research. In this work, quaternary composite materials involving a snowflake-like CdS nanocrystal wrapped by different amounts of polyoxometalate-decorated g-C 3 N 4 and polypyrrole (GPP@CdS) have been synthesized as photocatalysts for hydrogen production under visible-light irradiation. It has been revealed that the best composite (40 % GPP@CdS composite) exhibits hydrogen production activity of 1321 μmol, which exceeds that of CdS by a factor of more than two, and can be used in at least seven cycles with negligible loss of activity. The enhanced photocatalytic performance has been primarily attributed to the efficient synergy of CdS, g-C 3 N 4 , polypyrrole (PPy), and the polyoxometalate Ni 4 (PW 9 ) 2 . It should be noted that the introduction of PPy and g-C 3 N 4 into the title composite simultaneously promotes electron/hole pair separation and photocatalytic stability, whereas Ni 4 (PW 9 ) 2 serves as an efficient electron modulator and extra catalytic active site.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Ya Di,Kunling Lu,Yaling Tian,Yan Liu,Yunwang Zhao,Yue Zheng
Two-phase synthesis is an advantageous alternative to the traditional synthetic method, due to its less toxicity, controllable, mild synthetic conditions and easy large-scale synthesis. However, meeting novel synthesis, the conventional trial-and-error approach could not provide a clear understanding. We herein report synthesis and mechanism investigation of CdS quantum dots in octadecene/glycerol two-phase system. The effects of different reaction parameters and conditions including reaction temperature, reaction time, reactant concentrations, and synthesis routes (one-step and two-step approach) on both nucleation and particle growth were investigated. It was found that the synthesis course was a growth dominated process depending on both CdS(monomer) and CdS(nuclei), and controlled by the interface of ODE/glycerol. The present work provided a new and clear understanding about two-phase system synthesis on semiconductor quantum dots, noble metal nanocrystals and some alloy nanomaterials .
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yiting Liao,Lanzhen Peng,Xiaosong Zhou,Jin Luo,Limei Xu,Xiaomei Ning,Xiaoqin Zhou,Xunfu Zhou,Yueping Fang
Two major challenges in photocatalysis are the separation and utilization of photogenerated charge carriers that have limited their wider applications. To address these issues, significant studies have been devoted to the surface modification of photocatalysts. Herein, CdS nanorods were surface-modified by an ion-conducting LiTi 2 (PO 4 ) 3 (LTP) shell. This modification could accelerate the rapid separation and efficient utilization of photoinduced charge carriers. Therefore, CdS@LTP composite photocatalyst displayed a photocatalytic H 2 evolution rate of 26.01 mmol g −1 h −1 without any addition of cocatalysts in a Na 2 S/Na 2 SO 3 solution, which was over 6-fold compared to CdS, and showed improved stability. Furthermore, this shell can prevent the reverse reactions between H 2 and O 2 during photocatalytic water splitting. With the photo-deposition of Pt cocatalysts, CdS@LTP-Pt can achieve efficient overall water splitting with the highest H 2 generation rate (351 μmol g −1 h −1 ), which is 3.25 times higher than that of CdS-Pt. This study broadens the application of ionic conductor materials and provides a new way for the design of advanced photocatalysts for solar energy conversion.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 11
·6732-6744
·
IF 4.22
You Junhua,Wang Lu,Bao Wanting,Yan Aiguo,Guo Rui
Abstract The visible-light-responsive composite photocatalyst is beneficial to improve the solar energy utilization efficiency through the coupling of narrow bandgap materials. In this work, CdS nanowires were prepared by hydrothermal method, and then BiOBr/CdS composite materials with different mass ratios were successfully prepared by a simple two-step sonography-precipitation method using CdS nanowires as a deposition template. The photocatalysts were characterized by XRD, SEM, XPS, TEM, and other methods. Rhodamine B (RhB) was used as a model pollutant to evaluate the photocatalytic activity of BiOBr/CdS catalysts with different mass ratios. The photocatalytic test results show that the composite photocatalyst containing 60% BiOBr has the highest photocatalytic activity, which indicates that it is related to the decrease in photogenerated charge recombination rate. Subsequently, the electrochemical and physical methods were used to illustrate the electron transfer mechanism and the main active center of the as-prepared samples. Free radical capture experiments reveal that holes are the main active species in the photocatalytic process of composite samples. Graphical abstract BiOBr/CdS composite photocatalyst was prepared by a simple precipitation method using dispersed one-dimensional CdS nanowires as a template. BiOBr/CdS heterostructure combined adsorption and catalysis to degrade RhB molecules more efficiently. Free radical trapping experiments reveal that holes are the main active species in the photocatalytic process of composite samples.
研究领域:
材料科学
·
环境科学
·
光电催化
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Ziheng Wang,Xueying Chu,Jinhua Li,Zhankun Weng,Mingze Xu,Yingjiao Zhai,Li Ma,Xiaojun Wang
The polarization-sensitive optical properties of semiconductor nanorods (NRs) are attractive characteristics for optical devices . Although oriented NR films can provide convenient integration and new application opportunities, the realization of large-area NR films with polarized photoluminescence (PL) remains a challenge. Herein, we fabricated ordered CdSe/CdS NR films on an arbitrary substrate using the Langmuir-Blodgett technology. Polarization-sensitive PL was observed for the NR films. The band-edge exciton fine structure owing to the rod-like morphology and the dielectric effect of the orderly arranged NRs were discussed with a focus on the contribution to polarized photons. The degree of linear polarization of the CdSe/CdS NR films excited a circularly polarized light was approximately 0.30. When linearly polarized ultraviolet (UV) light was used as the excitation source, the PL intensity of the NR films periodically varied with the polarization direction of the UV light. The corresponding PL polarization (i.e., “excitation polarization”) was approximately 0.28. The polarization-sensitive fluorescence (approximately 526 nm) excited by the UV-polarized light (325 nm) demonstrates the potential for realizing low-cost polarization-sensitive devices using only a visible light charge-coupled device system.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Qiang Cai,Zhuofeng Hu,Qian Zhang,Boyuan Li,Zhurui Shen
Herein, the fullerene (C 60 )/CdS nanocomposite has been fabricated by a facile one-pot hydrothermal method. Its photocatatlytic hydrogen (H 2 ) evolution rate and degradation efficiency of Rhodamine B (Rh B) are evaluated under visible light irradiation (λ ≥ 420 nm). The content of C 60 has been changed from 0.4 wt% to 8 wt%, and the optimal value for photocatalytic activity is determined to be 0.4 wt%. The H 2 evolution rate over this optimal sample reaches 1.73 mmol h −1 g −1 and its apparent degradation rate of Rh B is 0.089 min −1 (degradation efficiency of 97% within 40 min), which is 2.3 times and 1.5 times compared to that of pure CdS reference. Moreover, the photocorrosion of CdS in composite is effectively suppressed, and its photocatalytic activity can be well maintained after three recycles (97.8% retaining for composite vs. 84.4% retaining for CdS). Then, the enhanced photocatalytic activity and stability of C 60 /CdS nanocomposite are further studied by spectroscopic and electrochemical methods. Results show that the C 60 species covering on the surface of CdS can efficiently accelerate the separation and transfer of photoexcited charge carriers, which can improve its activity, and reduce the photocorrosion of CdS.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Wenlong Zhen,Xiaofeng Ning,Meng Wang,Yuqi Wu,Gongxuan Lu
CdS is a promising visible-light responsive photocatalyst. However, the serious photocorrosion limits its application in photocatalysis. Here we report a novel strategy to overcome the disadvantage of CdS photocorrosion by fabricating peroxide decomposing active MnO 2 thin-layer over CdS nanowires (NWs) and assembling oxygen separation artificial gill to remove nascent formed oxygen in the dispersion. In the meantime, the using non-noble metal NiSe quantum dots (QDs) co-catalyst, NiSe/MnO 2 -CdS photocatalysts shows excellent photocatalytic over-all water splitting activity and remarkable stability under visible light irradiation without addition of any sacrifice reagent, 455.0 µmol h −1 g −1 of hydrogen evolution reaction (HER) rate and 5.20% of apparent quantum efficiency (AQEs) at 430 nm. Removing nascent formed O 2 from water by artificial gill can prevent the oxygen leading CdS photocorrosion. Photoluminescence spectra and photoelectrochemical measurements indicate that loading NiSe QDs and coating MnO 2 thin-layer can also improve transfer of the photogenerated charges in CdS. MnO 2 thin-layer can decompose formed hydrogen peroxide and enhance water splitting. Our results could potentially provide a new method for designing and fabricating more stable and efficient CdS-based nanocomposite photocatalysts toward versatile solar energy conversion.
研究领域:
材料科学
·
光催化
·
能源转换
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）