JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Chunhe Li,Shiwen Du,Congrong Lu,Kuankuan Ren,Qi Wang,Shunyi Shan,Qiang Li,Zebo Fang,Xiudong Li,Weidong Dou
Exploring efficient photocatalysts to facilitate water splitting into green hydrogen (H 2 ) energy is of great significance nowadays. In this work, we successfully synthesized CdS nanoflowers coated by zero-dimensional MMoS 4 (M = Ni, Co, Cu) cocatalysts using a mild two-pot solvothermal method. Notably, 2.5%-NiMoS 4 /CdS catalyst exhibits optimal photocatalytic H 2 evolution from benzyl alcohol aqueous solution under visible-light irradiation, and its photocatalytic H 2 activity (7269.5 μmol·h −1 ·g −1 ) is 10.1 times higher than that of pure CdS (716.6 μmol·h −1 ·g −1 ). Simultaneously, benzyl alcohol can be synergistically converted into benzaldehyde after dehydrogenation . Such excellent photocatalytic performance mainly benefits from the existence of an internal electric field (IEF), which is demonstrated by experimental analysis and density functional theory calculations. And the IEF greatly accelerates the separation of electron-hole pairs during the photocatalytic H 2 evolution process.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
·
IF 6.984
Jie Liu,Jianqiang Liu,Chenglei Wang,Zhongwei Ge,Dali Wang,Lixin Xia,Liang Guo,Na Du,Xiaotao Hao,Hongdi Xiao
The surface passivation strategy is one of the effective ways to improve the power conversion efficiency (PCE) of quantum dots-sensitized solar cells (QDSSCs). In this work, a novel ZnS/SiO 2 coating serves as the passivation layers for the CdS/CdSe co-sensitized solar cells based on zinc titanium mixed metal oxides (MMOs) obtained from layered double hydroxides (LDHs) precursor. The incorporation of passivation layers effectively improved the performance of the corresponding CdS/CdSe quantum dots co-sensitized solar cells and the best PCE of 4.91% has been achieved, which represents an over 55% improvement than that of devices without passivation. The effects of ZnS/SiO 2 double passivation layers were systematically investigated, especially by 2D time-resolved fluorescence imaging and electrochemical impedance spectroscopy technique . It was revealed that the existence of ZnS/SiO 2 outer layers caused the suppression of charge recombination, higher electrons collection efficiency, and superior surface quality.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Kangwei Zhang,Tianci Fang,Shuren Wang,Hongyu Wang,Ruoyi Jin,Xinyu Li,Zixian Qiu,Junli Fu,Zhen Qu,Yujie Liang,Wenzhong Wang
A novel BaTiO 3 /CdS-sensitized TiO 2 photoanode was designed for PEC H 2 evolution. • Continuous stepped band structure was formed into TiO 2 for boosting PEC reaction. • BaTiO 3 /CdS-sensitized TiO 2 photoanode exhibits remarkably enhanced H 2 generation. • Continuous stepped charge transport channel drives charge carrier separation. • Enhanced PEC performance is due to boosted light utilization and charge separation. A key challenge for photoanodes in photoelectrochemical (PEC) water splitting hydrogen evolution is the simultaneous enhancement of light harvesting efficiency, surface water oxidation kinetics, bulk charge carrier separation and surface charge carrier injection efficiency. In this work, BaTiO 3 and CdS nanoparticles are sequentially exploited to sensitize TiO 2 photoanode, constructing continuous step-like charge transfer channels for efficient PEC hydrogen evolution. As a result, the BaTiO 3 /CdS-sensitized TiO 2 photoanode exhibits a negative shift in initial potential, a low overpotential and a reduced Tafel slope, confirming that synergistic sensitization of BaTiO 3 and CdS effectively accelerates the surface water oxidation kinetics of TiO 2 photoanode. Simultaneously, BaTiO 3 /CdS-sensitized TiO 2 photoanode achieves significantly enhanced bulk and surface charge separation efficiency, 4.2 and 2.4 times higher than those of pure TiO 2 photoanode, respectively. Consequently, the hydrogen evolution rate of constructed BaTiO 3 /CdS-sensitized TiO 2 photoanode is 37.3μmol h −1 , 11.2-fold higher than that of pure TiO 2 photoanode. The finding of this work offers a novel and reliable method for the design and construction of high performance TiO 2 -based photoanodes with continuous charge transfer channels for potential applications in PEC hydrogen production. Accelerating surface reaction kinetics and boosting bulk as well as surface charge separation efficiency for enhanced photoelectrochemical hydrogen evolution of BaTiO 3 /CdS-sensitized TiO 2 photoanode. Download: Download high-res image (172KB) Download: Download full-size image
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 21
·10339-10346
·
IF 3.925
Cong Huang,Xuehua Zhang,Dongyang Li,Mengyue Wang,Qiang Wu
Synthesizing highly efficient photocatalysts for photoreduction of CO2 into solar fuel is of great significance for solving the energy shortage and environmental pollution. Here, a series of CdS photocatalysts are synthesized via the solvothermal method by tuning the Cd–S precursor molar ratio of Cd(NO3)2 to CS(NH2)2, and used as photocatalysts for CO2 reduction into solar fuel. The crystal structure, morphology, optical properties, charge separation, and photocatalytic performance of the CdS photocatalysts are greatly influenced by the Cd–S precursor molar ratio. After changing the molar ratio of Cd(NO3)2 to CS(NH2)2, the morphology of the synthesized CdS changes from nanorods to self-assembled nanoflowers and floccules with a high proportion of (002) crystal planes. As the molar ratio of Cd(NO3)2 to CS(NH2)2 increases, the BET specific surface area of the synthesized CdS catalysts increases obviously, the surface sulfur vacancies gradually increase, and the photo-generated charge separation is also enhanced. CdS2-1 synthesized using a molar ratio of Cd(NO3)2 to CS(NH2)2 = 2 : 1 shows the highest performance for photocatalytic reduction of CO2 to CO (146.3 μmol g−1) and H2 (582 μmol g−1) in 6 h under visible light irradiation, which is 11.2 and 4.4 times those over CdS1-3 synthesized using a molar ratio of Cd(NO3)2 to CS(NH2)2 = 1 : 3, respectively. This research demonstrates that a slight change of the precursor molar ratio in the synthesis of a catalyst can cause big changes in the photochemical properties and the corresponding photocatalytic performance.
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高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
Yulin Zheng,Yunlei Zhou,Xiaoting Cui,Huanshun Yin,Shiyun Ai
The photoactivity of CdS nanorods was greatly improved by amino functionalized accordion-like MXene and spherical ZnSnO 3 . MXene possesses good electron transfer capability and ZnSnO 3 presents matched energy band with CdS, which deeply accelerate the electron transfer and prevent the recombination of photogenerated electron-hole pair, leading to a strong photoelectrochemical (PEC) response. Taking the merit of the improved photoactivity of CdS nanorods, a novel PEC biosensor was constructed for DNA hydromethylation detection based on immune recognition of target molecule, where 5-hydroxymethyl-2′-deoxycytidine triphosphate (5hmdCTP) was employed as detect target, CdS/MXene was used as photoactive material, and ZnSnO 3 was adopted as signal amplification unit. Under enzymatic covalent reaction of –CH 2 OH of 5hmdCTP with –NH 2 of MXene, 5hmdCTP was specifically recognized and captured. Then, taking advantages of the covalent reaction between phosphate group of 5hmdCTP and ZnSnO 3 , the signal amplification unit was captured. Under the optimum conditions, this PEC biosensor presents wide linear range of 0.008–100 nM and low detection limit of 4.21 pM (3σ). The applicability of the developed method was evaluated by investigating the effect of Cd 2+ and perfluorohexane compound pollutant on 5-hydroxymethylcytosine content in the genomic DNA of the roots and leaves of wheat seedlings.
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Molecular Catalysis
·
2021
·
IF 5.062
Zhenning Xu,Yanhong Wang,Jiayuan Zhuang,Yawen Li,Lishan Jia
Herein, we proposed a facile method to synthesize N doped carbon quantum dots (NCQDs) using g-C 3 N 4 as carbon-nitrogen source, and the NCQDs-modified CdS nanocomposite catalysts for photocatalytic water splitting were synthesized by one-step hydrothermal method. The results showed that the NCQDs with a size of 3.2 nm obtained by hydrothermal etching were adsorbed on the surface of CdS particles with a size of 80 nm and induced the regulation of the surface morphology of CdS particles. There was strong interaction between NCQDs and CdS through C-S bond. The introduction of NCQDs in composite catalysts not only increased the photo-absorption performance but also suppressed the recombination of photo-generated carriers, which enabled the photo-generated electrons to transfer to NCQDs effectively and quickly and improved the photocatalytic performance of hydrogen production from water splitting. The composite photocatalysts showed good response to visible light in UV-Vis DRS and the photocatalytic water splitting experiment showed that the photocatalytic hydrogen production activity of composite catalysts was significantly improved under visible light (λ > 400 nm). And the maximum hydrogen production rate reached 2306.1 μmol/g/h, which was about 7 times the amount of unsupported NCQDs sample.
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高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 42
·22065-22074
·
IF 11.301
Hongling Guo,Gang Wang,Rutao Meng,Yali Sun,Siyu Wang,Shengli Zhang,Jianyu Wu,Li Wu,Guangxing Liang,Hui Li,Yi Zhang
A Li+-doping strategy is a promising route for achieving highly efficient Cu2ZnSn(S,Se)4 (CZTSSe) photovoltaic devices with a large grain absorber layer, high p-type carrier concentration and good band alignment at the Cu2ZnSn(S,Se)4/CdS interface. However, Li+-doped CZTSSe solar cells based on in situ and pre-deposition doping strategies reported thus far generally suffer from massive lithium losses and sodium rejection due to the soda-lime glass substrate. Therefore, simultaneously fulfilling the goals of simple and efficient Li+-doping remains a major technical challenge, which may be addressed, as we demonstrate here, with the development of a Se&LiF co-selenization process. By engineering the band alignment of the Cu2ZnSn(S,Se)4/CdS interface through the Se&LiF co-selenization process, an encouraging efficiency of 11.63% with an open-circuit voltage deficit of 0.583 V has been reached. Furthermore, the crystallinity of the absorber layer and the distribution of copper are improved, and a more copper-poor CZTSSe surface is formed. This novel Li+-doping strategy introduces a new approach towards the goal of high-performance CZTSSe solar cells compatible with a simple manufacturing process and excellent performance.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lixiang Zhang,Luping Feng,Xiao Zhuang,Peisong Tang,Guofu Chen,Hua Wang
A visible-light-responsive photoelectrochemical (PEC) sensor was proposed for the sensitive and selective analysis of chlorpyrifos (CPF) by synergistically using CoS 2 quantum dots (QDs) and CdS nanowires (NWs). The CdS NWs were first prepared by the solvothermal method and subsequently combined with CoS 2 QDs to produce CoS 2 /CdS product with 0D/1D heterostructure. It turned out that the so-obtained nanocomposites with 0D/1D heterostructure could greatly suppress the recombination of photoinduced electrons and holes, and the electrode modified with this composite could exhibit preferable PEC performance and photocurrent signal compared to the one with CdS or CoS 2 . After the addition of CPF, the photocurrent signal of the proposed PEC sensor was found to be selectively decreased because of the specific chelation between the cobalt sites of CoS 2 /CdS and the sulfur, nitrogen-atoms of CPF, which might block the electrons transferring process. The proposed PEC sensor could detect CPF in concentrations that linearly span from 0.030 to 100 ppb with an ideal detection limit of 0.010 ppb, which performances are much better than those of currently used analytical methods. Furthermore, this work may establish a framework for the development of various PEC sensing platforms with 0D/1D heterostructure for the quantitative assay of environmental pollutants like CPF.
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GREEN CHEMISTRY
·
2012
·Vol. 14
·期 6
·1705-1709
·
IF 6.32
Weiming Wu,Guodong Liu,Quanhua Xie,Shijing Liang,Huarong Zheng,Rusheng Yuan,Wenyue Su,Ling Wu
Highly efficient photocatalytic reduction of 4-nitroaniline to p-phenylenediamine over a commercial CdS photocatalyst was observed under visible light irradiation (λ ≥ 420 nm) in water. The conversion of 4-nitroaniline and the selectivity of p-phenylenediamine were ∼100% and ∼98% after 9 min of visible light irradiation, respectively. The photoreduction efficiency of 4-nitroaniline over the CdS photocatalyst remained above 95% in the 5th cycle of testing. Its photocatalytic activity was much higher than those of nitrogen-doped TiO2 and commercial TiO2 photocatalysts. Further experimental results revealed that the ammonium formate and N2 atmosphere were indispensable for the photocatalytic reduction of 4-nitroaniline over the CdS photocatalyst. On the basis of the results of electron spin resonance, photoexcited electrons and ·CO2− radicals were detected in the present system. These species had strong reductive powers, and were therefore able to efficiently reduce 4-nitroaniline to p-phenylenediamine.
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高影响因子
ANALYTICAL SCIENCES
·
2016
·Vol. 32
·期 2
·161-166
·
IF 1.174
Xiaolin GUAN,Hongting FAN,Yang ZHANG,Donghai ZHANG,Tianming JIA,Shoujun LAI,Ziqiang LEI
Using environment-friendly materials for sensing toxic metal ions has drawn significant attention in recent research. Herein, we present an aqueous synthesis of stable CdS quantum dots (QDs) using thiol-functionalized poly(vinyl alcohol) (PVA) as the unique capping ligand for the detection of trace Hg2+ in environmental water samples. The CdS QDs with an average size of 3.3 nm had good water-solubility and favorable fluorescence with a quantum yield of 32.8% and a longer luminescence lifetime of 31.9 ns. The fluorescence intensity of QDs aqueous solution in the 520 nm wavelength was quenched upon the addition of Hg2+. Under the optimal conditions, the ratio of the blank fluorescence intensity to the quenched fluorescence intensity was linearly proportional to the Hg2+ concentration from 2 to 4000 nM with a detection limit of 1 nM. Also, many co-existing metal ions were not interfered with the detection of Hg2+. This nanomaterial was successfully applied to the measurement of Hg2+ in water samples.
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PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Mengxue Ji,Jian Wen,Qiuyue Xu,Guanghui Wu,Pinghua Chen,Xibao Li,Hualin Jiang,Xubiao Luo
Environmental pollution and energy shortage are two major challenges facing humanity today. Photocatalytic technology, as a green and sustainable approach, is an important choice for effectively addressing these challenges. The formation of S-scheme heterojunctions and built-in electric fields can significantly improve the transfer and separation of photoinduced charge carriers, hence enhancing the efficiency of photocatalytic reactions, which is greatly significant for improving the performance of photocatalysts. In this study, a photocatalyst CdS/ZnIn 2 S 4 with a built-in electric field, which is an S-scheme heterojunction photocatalyst, was prepared by a simple solvothermal method. CdS/ZnIn 2 S 4 exhibited efficient visible-light-driven H 2 evolution from water, with a rate of 4.09 mmol g -1 h −1 , 3.60 and 2.80 times higher than that of CdS and ZnIn 2 S 4 , respectively, and an apparent quantum efficiency (AQE) of 2.71 %. Moreover, it also showed performance in visible-light-driven degradation of various ECs, achieving degradation rates of 82.2 %, 80.9 %, and 81.5 % for tetracycline, ciprofloxacin, and norfloxacin, respectively, within 40 min. It was confirmed that the successfully constructed S-scheme heterojunction can effectively separate photoinduced electron-hole pairs and suppress their recombination. The built-in electric field inside the composite material can effectively promote the movement of photoinduced charge carriers, thereby promoting the course of photocatalytic reactions. This study is positively significant for the development of novel efficient photocatalysts, exploration of new methods for environmental pollution control, and development of green hydrogen energy.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Dandan Ma,Diankun Sun,Yajun Zou,Siman Mao,Yixuan Lv,Yao Wang,Jun Li,Jian-Wen Shi
A series of dandelion-like Fe-CeO 2 /CdS (FeCe x /Cd y ) nanoflowers with different molar ratios of Fe-CeO 2 to CdS are synthesized by solvothermal method for the first time. The FeCe x /Cd y nanoflowers are assembled by a large number of nanoparticles with the diameter of about 3 nm, and the introduction of Fe ions and the couple of CdS quantum dots (QDs) efficiently enhanced the relative percentage of Ce 3+ in CeO 2 . The as-obtained FeCe 1 /Cd 1 heterostructure exhibits the highest photocatalytic H 2 evolution ability of 108.9 μmol/h, which is 20.5, 6.1 and 7.1 times higher than CeO 2 , Fe-CeO 2 and CdS, respectively. This significantly enhanced photocatalytic performance can be mainly attributed to the synergy between the electronic anchoring effect of Fe 3+ /Fe 2+ and Ce 4+ /Ce 3+ redox couples and the internal electric field constructed by the II-type heterojunction between Fe-CeO 2 and CdS. This work provides a new idea for the design of efficient photocatalysts by combining the advantages of heterostructure and ion anchoring effect.
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高影响因子
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