NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 45
·21560-21567
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IF 3.925
Jinyang Liu,Yan Zhou,Xiuniang Tan,Shengjiang Zhang,Chunjiao Mo,Xiaobo Hong,Taolong Wu,Xuecai Tan,Yanjuan Liao,Zaiyin Huang
The establishment of heterojunctions is an effective way to improve the performance of semiconductor photocatalysts as a solution to solve environmental pollution problems; however, the decomposition efficiency of organic pollutants driven by sunlight remains a challenge. Herein, CoS2-decorated CdS hetero-junctions as highly efficient photocatalysts were rationally synthesized via a three-step process and CoS2-decorated CdS composites were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV-Vis diffusion reflectance spectrometry, fluorescence spectroscopy analysis, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, and transient photocurrent measurement. Using organic dyes rhodamine B (Rh B) and nitenpyram (NTP) as model pollutants, the performance of the CoS2-decorated CdS composites for the degradation of model pollutants were evaluated. Among them, the material with the best performance can degrade 99.5% Rh B and 92.5% NTP within 120 min. Furthermore, the catalyst still maintained its high catalytic activity after five cycles. This work provides a new idea for developing efficient and inexpensive hetero-junctions as photo-catalysts.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Jiajia Guo,Yang Mao,Jianping Ao,Yanchen Han,Chun Cao,Fangfang Liu,Yi Zhang
Although the ohmic-contact and electrostatic field can be regulated by the intermediate layer for efficient carrier extraction, challenges remain in high-quality back contact as well as improved quality of crystallized CZTSSe absorber layer simultaneously. Here, we introduce a controllable CdS nanolayer prepared by the chemical bath deposition (CBD) process between the CZTS precursors and Mo back contact. The results disclose that the surface chemistry of the naked Mo film can be modified by the formed CdS nanolayer and thus MoS 2 complex during the chemical bath process. However, such CdS nanolayer and MoS 2 complex can be readily consumed during the following selenization process, without deteriorating the ohmic-back contact. Simultaneously, the as-grown CZTSSe absorber is not only with high crystallinity and less composition fluctuations, but also doped by Cd 2+ . Subsequently the efficiency of CZTSSe solar cells is increased by 26% as CdS nanolayer is introduced. This work provides a cost-effective and universal approach to design and modify the interface or surface of photovoltaic and photoelectrochemical devices.
研究领域:
材料科学
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太阳能电池技术
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 36
·15839-15845
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IF 2.7
Tao Wang,Mengyao Shi,Changyan Guo,Jide Wang
ZIF-67 has garnered much attention in the field of photocatalytic water splitting due to the advantages of MOFs and zeolite sieves. However, post-modification and composite strategies have emerged as effective approaches to enhance its photocatalytic performance, particularly in enabling bi-functionality for oxidation-coupled reduction reactions. In this study, 2-mercaptobenzimidazole (MBI) modified ZIF-67 and cadmium sulfide (CdS) composites were prepared to investigate their application in photocatalytic oxidation-coupled hydrogen evolution reactions. The results demonstrated an enhancement in hydrogen production performance over CdS@ZIF-67-MBI, with an increase from 2.39 mmol g−1 h−1 to 4.49 mmol g−1 h−1 upon the introduction of MBI. Moreover, the conversion efficiency of benzyl alcohol reached an improved value of 58.5%. The study findings revealed that the heterogeneous coupling between ZIF-67 and CdS, along with the effective charge transfer facilitated by the anion S, played a decisive role in promoting charge–hole separation of composite materials and improving carrier transport efficiency. This demonstrates the viability of utilizing ZIF-67 in a bifunctional photocatalytic reaction system, thereby paving the way for broader applications of ZIF-67.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
Coatings
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2022
·Vol. 12
·期 9
·1235
·
IF 3.236
Qi Hu,Jiantao Niu,Ke-Qin Zhang,Mu Yao
The photocatalytic hydrogen production efficiency of a single SrTiO3photocatalytic catalyst is often low, which is mainly due to the serious combination of electrons and holes produced by photocatalysis as well as the mismatch of the redox capacity and light absorption range. Construction of semiconductor heterojunctions can solve these problems. CdS has a narrow band gap, which can effectively utilize visible light, and it has a band structure matched with that of SrTiO3. Therefore, CdS is considered as an ideal candidate for constructing heterojunctions with SrTiO3. In this paper, bamboo pulp fibers were used as the substrate, and SrTiO3was coated on the substrate through the solvothermal process. CF/SrTiO3rich in oxygen vacancies was formed by high temperature carbonization, and heterojunctions were formed by loading CdS on the surface of the CF/SrTiO3composite material through the hydrothermal method, thus obtaining one-dimensional CF/SrTiO3/CdS core–shell photocatalysts. The structure and photocatalytic hydrogen production performance of the CF/SrTiO3/CdS core–shell photocatalysts were mainly studied. The photocatalytic hydrogen production experiment showed that the hydrogen production rate of the CF/SrTiO3/CdS-2 sample under the optimized process was as high as 577.39 μmol/g·h, which was about 11 times that of the CF/SrTiO3sample. In this composite photocatalytic material system, the loading of the CdS nanospheres could enhance the visible light absorption capacity of the composite catalyst, promote the rapid separation and high-speed migration of photocarriers, and significantly improve the photocatalytic activity.Keywords:SrTiO3;photocatalytic;hydrogen production;carbon fiber;oxygen vacancy;CdS
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Jinhua Wang,Qiong Zhu,Yunwen Liao,Hongquan Fu,Jinming Chang,Yuling Zhang,Taotao Kan,Hejun Gao,Wenchao Huang
Nano-CuO have been grown on the surface of CdS nanorods by a simple solution-phase reaction, which greatly enhanced the hydrogen evolution ability of CdS. The physical chemistry properties of CuO/CdS nanocomposites were investigated by XRD, SEM, TEM, BET, XPS and electrochemical methods. The morphology and crystal structure of CdS were not influenced by the loading of Nano-CuO. And it was helpful to delay the time of electron recombination to the hole, and greatly improved the hydrogen evolution performance of CdS. When the loading of Nano-CuO was 1 wt%, the photocatalytic performance of CdS increases from 105 μmol g −1 h −1 to 3317.5 μmol g −1 h −1 . After several cycles, the structure of CuO/CdS nanocomposites was not changed, and Nano-CuO could effectively prevent the photo-corrosion defects of CdS. This work provides a new way to improve the hydrogen evolution performance of CdS by growing nano-oxide on CdS surface.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
RSC Advances
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2022
·Vol. 12
·期 18
·11262-11271
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IF 4.036
Qiong Zhu,Jinhua Wang,Si Chen,Hongquan Fu,Juan Zhang,Hejun Gao,Yunwen Liao
By controlling the species of the organic sulfur source, CdS samples were produced with different photocatalytic performances by a low-temperature solvothermal method. Different species of the organic sulfur source were chosen as the coordination agent to control the interactions in the crystal growth process. Among them, thioacetamide was the best coordination agent. The hydrophobic chain could be good for reducing the resistance of charge transfer, and increasing the rate of surface charge transfer and the lifetime of the photoexcited electrons. Benefiting from the hydrophobic chain, CdS shows an excellent photocatalytic hydrogen evolution rate of 943.54 μmol h−1 g−1 and a rhodamine B photocatalytic degradation rate of 99.1% in 60 min, which is superior to the photocatalysis of pure CdS prepared by many other methods.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
PubMed
高影响因子
DALTON TRANSACTIONS
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2024
·Vol. 53
·期 18
·8011-8019
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IF 3.5
Kai Liu,Mao-Jin Ran,Zhi-Rong Li,Yi-Fu Huang,Ze-Yu Jiang,Wan-Ying Li,Shokir Khojiev,Zhi-Yi Hu,Li-Hua Chen,Jing Liu,Yu Li,Bao-Lian Su
Designing efficient, inexpensive, and stable photocatalysts to degrade organic pollutants and antibiotics has become an effective way for environmental remediation. In this work, we successfully performed in situ growth of CdS QDs on the surface of elliptical BiVO4 to try to show the advantage of the binary heterojuncted photocatalyst (BVO@CdS) for the photocatalytic degradation of tetracycline (TC). The In situ growth of CdS QDs can provide a large number of reactive sites and also generate a larger contact area with BiVO4. In addition, compared with mechanical composite materials, in situ growth can significantly reduce the energy barrier at the interface between BiVO4 and CdS, providing more channels for the separation and migration of photogenerated charge carriers, and further improving reaction activity. As a result, BVO@CdS-0.05 shows the best degradation efficiency, with a degradation rate of 88% after 30 min under visible light. The TC photodegradation follows a pseudo-second-order reaction with a dynamic constant of 0.472 min−1, which is 6.47 times that of pure BiVO4, 7.24 times that of pure CdS QDs and 2 times that of the mechanical composite. The degradation rate of BVO@CdS-0.05 decreases to 77.8% with a retention rate of 88.5% after four cycles, demonstrating excellent stability. Through liquid chromatography-mass spectrometry (LC-MS) analysis, two possible pathways for TC degradation are proposed. Through free radical capture experiments, electron spin resonance measurements, and photoelectrochemical comprehensive analysis, it is confirmed that BVO@CdS composites have constructed an efficient Z-scheme heterojunction via in situ growth, thereby highly enhancing the separation and transport efficiency of charge carriers.
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
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2023
·Vol. 40
·期 7
·2300010
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IF 2.7
Qinghua Du,Hui Zhang,Jiapeng Zhang,Xinjian Xie,Guodong Liu,Guifeng Chen
Quantum dots have received great interest due to their excellent optoelectronic properties. However, the surface defects of quantum dots affect the carrier transport and ultimately reduce the photovoltaic efficiency. In this paper, a core–shell quantum dot by hot-injection method is prepared to grow a narrow-band semiconductor layer (CuInSe 2 (CISe) quantumdot) on the surface of a broad-band core material (cadmium sulfide (CdS) nanocrystal). The composition, structure, optical properties, and decay lifetime of CdS/CISe core–shells are investigated in more detail by X-ray diffraction (XRD), transmission electron microscopy (TEM), photoluminescence (PL), UV–vis spectrophotometry, and fluorescence spectroscopy. The CdS/CISe core–shell structure has a broadened absorption range and still shows CISe-related quantum effects. The increased size of the core–shell and the smaller specific surface area of the CISe shell layer lead to a lower carrier complexation chance, which improves the carrier lifetime.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2023
·
IF 8.4
Yingshu Wang,Shuyue Wang,Jiasi Gan,Jinni Shen,Zizhong Zhang,Huidong Zheng,Xuxu Wang
One-pot synthesis of urea [(NH2)2CO] from easily available small molecules, that is, N2, CO2, and H2O, is an extremely attractive but very challenging reaction. 2D-CdS@3D-BiOBr composites with S-scheme heterojunctions are constructed via a facile hydrothermal technique followed by a self-assembly method and shown to be an excellent photocatalyst enabling the reduction of N2 and CO2 with H2O to (NH2)2CO under visible light. The optimal 40%2D-CdS@3D-BiOBr sample shows up to 15 μmol·g–1·h–1 total yield of NH3 and (NH2)2CO, of which (NH2)2CO accounts for 54%. The apparent quantum efficiency (AQE) is 3.93% for urea production. On the photocatalyst, urea is speculated to form by two possible chemical routes. One is direct photocatalytic synthesis. Both N2 and CO2 molecules are activated by the Cd2+ ion of 2D-CdS and the oxygen defect of 3D-BiOBr at the edges of the heterojunction interface of 2D-CdS/3D-BiOBr, respectively. *HNCONH* is the key intermediate of the formation of (NH2)2CO molecules. The other is indirect synthesis by photocatalysis and then thermocatalysis. N2 is reduced into NH3 and CO2 is reduced into CO on 2D-CdS by the photogenerated electrons and protons, and then the formed NH3 reacts with the reactant CO2 or the product CO to form (NH2)2CO by thermocatalysis on 2D-CdS. The former is dominant for urea synthesis. The work confirms that urea could be synthesized photocatalytically from cheap N2, CO2, and H2O under visible light. A composite heterojunction semiconductor could be a prospective photocatalyst appropriate for the complex reaction.
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
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 38
·25919-25926
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IF 4.123
Junwen Peng,Junli Xu,Zhaoyu Wang,Zhengxin Ding,Sibo Wang
Developing efficient alternatives to the widely used Pt cocatalyst in photocatalytic H2O splitting is of great importance in view of large-scale production of clear H2 energy. Herein, we report the facile synthesis of NiCo2S4 and its first use as a highly active and cost-affordable cocatalyst to boost visible light H2 generation with the CdS semiconductor. The synthesized NiCo2S4/CdS composite materials are fully characterized by various techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS), UV-Vis diffusion reflectance spectroscopy (DRS), and N2 adsorption measurements. With the optimized NiCo2S4/CdS composite sample, a high H2 generation rate of 137 μmol h−1 is obtained under visible light irradiation, which is more than 17 times higher than that of bare CdS material. The results of photoluminescence (PL) spectroscopy, transient photocurrent response and electrochemical impedance spectroscopy demonstrate the remarkably promoted migration and separation of photogenerated charge carriers over the heterostructured NiCo2S4/CdS material, thus leading to obviously enhanced photocatalytic performance. Moreover, a possible mechanism for the photocatalytic H2 evolution reaction is also proposed based on the observed results of activity evaluation and photoelectrochemical measurements.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2014
·
IF 2.93
Jian Yu,Si-Liang Lei,Tong-Cai Chen,Jian Lan,Jian-Ping Zou,Lin-Hua Xin,Sheng-Lian Luo,Chak-Tong Au
A new strategy has been put forward to improve the performance of photocatalytic H 2 evolution of tantalate-based catalysts through designing solid solutions Bi 1− x In x TaO 4 combined with CdS, among which the solid solutions Bi 1− x In x TaO 4 ( x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, and 1.0) were firstly synthesized by the citrate method using cheap and environment-friendly Ta 2 O 5 . The experimental results reveal that the Bi 0.5 In 0.5 TaO 4 solid solution shows the best photocatalytic performance among the Bi 1− x In x TaO 4 solid solutions. And in the absence of noble metals, the 30% CdS/Bi 0.5 In 0.5 TaO 4 (30CBITO) catalyst exhibits good photocatalytic hydrogen evolution from water splitting with a rate of H 2 production of 511.75 μmol h −1 g −1 under simulated sunlight irradiation. And the rate of hydrogen evolution does not markedly change for 60 h. Their compositions , structures and morphologies were characterized by UV–vis diffusion reflectance spectroscopy (DRS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM). A photocatalytic enhancement mechanism was put forward to elucidate the superior photocatalytic activity and long-term stability of the heterostructured CdS/Bi 0.5 In 0.5 TaO 4 composites.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 14
·2692-2701
·
IF 5.958
Shuangshuang Kai,Baojuan Xi,Haibo Li,Shenglin Xiong
Z-scheme photocatalytic systems, consisting of semiconductor/semiconductor heterostructures, mimic the natural photosynthesis and enhance the photocatalytic activity dramatically. Herein, we have for the first time synthesized unique all-solid-state Z-scheme ternary heterostructures by growing CdS nano-hemispheres radially assembled with nanorods as the core and CoS hexagonal nanoflakes as the shell on graphene sheets (CdS/Co9S8-RGO) through a facile one-pot hydrothermal method and subsequent annealing treatment. Furthermore, the growth mechanism is explored and analyzed by monitoring the intermediates in terms of structure and composition. The heterostructures form three paths available for charge carrier transfer and separation, wherein a redox-mediator-free Z-scheme constitutes CdS and Co9S8 and upgrades to an all-solid-state Z-scheme system by combination with RGO. Moreover, due to the excellent photon capture capability and electric conductivity, RGO also made great contribution to the effective separation and transfer of photogenerated carriers. Benefiting from efficient charge transfer and separation, CdS/Co9S8-RGO exhibits a H2 evolution rate up to 4.82 mmol h−1 g−1 and remarkable activity stability even after 20 h of photocatalytic reaction. We believe that the design philosophy via the plain synthesis merges multiple structural interfaces and transfer paths in a system reported here, shedding an insight into the design of other photocatalysts.
研究领域:
材料科学
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能源化学
·
光催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）