INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Xiaojie Song,Xiufang Wang,Weiwei Dong,Qishu Qu,Haichen Wang,Fan Yang
Solar-to-chemical energy conversion via heterogeneous photocatalysis is one of the effective approaches to tackle the growing environmental and energy challenges. Homogeneously dispersed silver nanoparticles (Ag NPs) and cadmium sulfide nanoparticles (CdS NPs) with average particle size not>20 nm were fabricated on the surface of titanium dioxide nanotubes (TNTs) (Ag/CdS/TNTs) with the help of sodium dodecyl benzene sulfonate (SDBS). Herein, more surface active sites are created on the surface of nanocomposites. The experimental results demonstrate that the photocurrent intensity of the nanocomposites obviously increased, which effectively improves the photocatalytic activity. The results of photocatalytic experiments indicated that using triethanolamine (TEOA) and acetonitrile (MeCN) as sacrificial agents, the nanocomposites afford the CO yield from CO 2 (1455.6 μmol‧g −1 ‧h −1 ). Besides, Ag/CdS/TNTs nanocomposites displayed the H 2 evolution rate of 3700.57 μmol‧g −1 ‧h −1 , which was twice as much as pure TiO 2 NPs. The increase in the photocatalytic ability of the nanocomposites is basically attributed to the three materials formation S-scheme heterojunction which reduce the recombination probability of the photo-induced electrons and holes and thus enhances the photocatalytic activitys. Ultimately, a photocatalytic reaction mechanism is proposed for Ag/CdS/TNTs nanocomposites in the reduction of CO 2 .
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DOI
高影响因子
Nanoscience and Nanotechnology Letters
·
2017
·Vol. 9
·期 7
·989-997
·
IF 1.889
Liu Xinlin,Qin Yingying,Xing Guoliang,Li Chunxiang,Lang Jihui,Liu Yang,Xing Scott
In this paper, a novel type of core–shell structured ZnFe2O4@CdS composite photocatalyst is successfully synthesized by a facile two-step strategy method. The corresponding morphology, structure and optical properties of developed photocatalyst were well
characterized. The photocatalytic degradation of tetracycline (TC) experiments indicated that the ZnFe2O4@CdS core–shell exhibited a higher photocatalytic activity than the pure ZnFe2O4 and CdS under the visible light irradiation, especially
0.1 g ZnFe2O4@CdS composites with a content of 78 wt.% CdS resulted in 95.31% degradation of 20 mg/L TC in 90 min. with 0.1 g catalyst. Furthermore, the photodegradation mechanism was investigated by trapping experiments, which revealed that .O–2
was the most active species in the photodegradation process. And the possible process of charge transfer for ZnFe2O4@CdS composite photocatalyst was proposed based on the experimental results.
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高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Yanfei Zhao,Qi Wang,Congrong Lu,Kuankuan Ren,Shiyan Liu,Chunhe Li,Wei-Dong Dou
The development of photocatalysts with high charge separation efficiency and visible-light-harvesting capacity is still a great challenge. In this work, we report a simple hydrothermal treatment to decorate the CdS nanowires (NWs) with co-catalyst Cu2MoS4 nanosheets (NSs) for photocatalytic H2 evolution reaction (HER). Especially when the molar ratio of Cu2MoS4 to CdS is 3%, the Cu2MoS4/CdS shows excellent visible light-driven H2 evolution activity (1967.83 μmol g–1 h–1), which is 18.8 times higher than that of pure CdS. Structural characterizations demonstrate a well-designed structure of the Cu2MoS4/CdS, in which Cu2MoS4 NSs are tightly attached onto the CdS NWs to form a heterojunction. The optical property reveals that the 3%-Cu2MoS4/CdS nanocomposite displayed distinguished visible-light absorption capacity. Combined with the data analysis of the photoluminescence spectra, photocurrents, and electrochemical impedance spectra, it can be proved that there is effective separation of photogenerated electron–hole pairs in 3%-Cu2MoS4/CdS nanocomposite. All these factors synergistically boost the photocatalytic H2 evolution performance of the Cu2MoS4/CdS, providing a new concept for the rational design of highly efficient visible-light-driven sulfide photocatalysts.
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高影响因子
Solar RRL
·
2021
·Vol. 5
·期 9
·2100494
·
IF 8.582
Juntian Zhou,Ru Zhou,Jun Zhu,Ping Jiang,Lei Wan,Haihong Niu,Linhua Hu,Xi Yang,Jinzhang Xu,Baomin Xu
The cadmium sulfide (CdS) is a promising electron transport layer (ETL) material for perovskite solar cells (PSCs) due to its low photocatalytic activity toward perovskite materials under UV light. The critical problem responsible for the moderate performance of CdS-based PSCs is the parasitic light absorption of CdS, which drives researchers to deposit ultrathin ETLs. However, the ultrathin ETL often involves the undesirable shunt current leakage because of the direct contact between conducting substrate and perovskite layer. Herein, a fully low-temperature solution-processed colloidal SnO 2 -assisted CdS (S-CdS) ETL for planar CH 3 NH 3 PbI 3 PSCs is constructed. The detailed characterizations of morphological, optical, and energy levels confirm that the assistance of colloidal SnO 2 provides the ameliorated continuity, reduces surface roughness and superior wettability of ETLs for high-quality perovskite formation as well as the favorable cascade band structure for efficient charge transfer. The study of charge transfer mechanisms reveals that the S-CdS ETL effectively inhibits the shunt leakage, promotes the electron extraction and suppresses the charge recombination at the ETL/perovskite interface. Consequently, the S-CdS ETL-based PSCs deliver an appreciable efficiency of 16.26%, doubling that of conventional CdS-based devices. To the best of our knowledge, this value is the champion efficiency reported for CdS-based CH 3 NH 3 PbI 3 PSCs.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jiaqian Zhu,Yinghua Shen,Xiang Yu,Jia Guo,Yi Zhu,Yuanming Zhang
Immobilized CdS/BiOCl film photocatalysts were successfully synthesized by a facile two-step hydrothermal-hydrolysis method. The structures, morphologies, photocatalytic properties and reusabilities of the samples were studied. The photocatalytic activities of CdS/BiOCl were significantly improved compared with pure BiOCl. The photocatalytic activity of 6% CdS/BiOCl was the highest and 10 times higher than pure BiOCl, which was attributed to the enhanced visible light absorption and the higher separation of photogenerated carriers. Besides, 6% CdS/BiOCl also showed good recycling performance. A new photocatalytic mechanism, totally different from other mechanisms of BiOCl-based heterostructures , was revealed. It was part of electrons on the conducting band of CdS rather than the transferred electrons on the conducting band of BiOCl that oxidized O 2 into O 2 − , and O 2 − together with h + on the valence band of CdS degraded organic pollutants. BiOCl did not generate electrons and holes, but only served as the electron transferer as electrons on the conducting band of CdS transferred to the conducting band of BiOCl, facilitating the separation of hole-electron pairs. This work provided a good reference for design and synthesis of film photocatalysts and new insights into photocatalytic mechanisms for heterostructures.
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高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Hao Wang,Huili Ye,Bihong Zhang,Faqiong Zhao,Baizhao Zeng
A ZnIn2S4/CdS photocatalyst was synthesized based on an electrostatic interaction mechanism and was used to construct a photoelectrochemical (PEC) sensor for the highly sensitive and selective detection of dopamine (DA). As CdS and ZnIn2S4 possessed overlapping band potentials, they could form a heterojunction, which was favorable for charge separation and PEC conversion. Thus, the ZnIn2S4/CdS composite showed better PEC properties and higher photocatalytic activity than pure ZnIn2S4 and CdS. When it was used for DA sensing in a weak alkaline solution, DA turned to polydopamine and acted as an effective electron acceptor to make the anodic photocurrent decrease. Owing to adopting this detection strategy, the interference of coexistent reductive species (i.e., electron donor) was avoided effectively. Under the optimized conditions, the photocurrent change was linear to DA concentration in the range from 0.3 to 300 μM, and the detection limit was 0.1 μM. The ZnIn2S4/CdS/indium tin oxide sensor was applied for the indirect detection of DA in urine samples, and it presented a good performance.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 38
·25919-25926
·
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.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Xiaofeng Yi,Shurui Liu,Mingyu Luo,Qingbiao Li,Yuanpeng Wang
Microbe-photocatalyst biohybrids, integrating the optimal attributes of whole-cell catalysts and nanometer photocatalysts, have emerged as a promising strategy for environment-associated applications. However, few such biohybrids have been tested for complex pollution systems. Herein, we constructed an outer membrane photosensitized Geobacter sulfurreducens ( G. sulfurreducens )-CdS biohybrid, which enabled to generate stronger photocurrent in response to irradiation and meanwhile achieved an significant promotion for the redox transformation of Cr(VI) and tetracycline compared with that of bare G. sulfurreducens or CdS counterparts. Further analysis revealed that the outer membrane played a significant role in photoelectron transfer. Differential pulse voltammetry (DPV) tests demonstrated that CdS enhanced the catalytic activity of C-type cytochromes on the outer membrane under irradiation, resulting in the increase of electron-hole pairs separation efficiency. The possible degradation pathway of tetracycline was proposed based on determined intermediates, whose toxicities were well evaluated. Importantly, the toxicity of the final detected intermediates was apparently decreased. Overall, this work aims to explore the working mechanisms of the novel G. sulfurreducens -CdS biohybrid system and opens up a new avenue to purifying combined wastewater by microbe-photocatalyst biohybrids.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Pan Li,Chunchao Hou,Xuehua Zhang,Yong Chen,Tao He
The hybrid coupling between inorganic semiconductor and molecular catalyst can provide a promising approach for the construction of highly efficient and selective photocatalytic CO 2 reduction systems. This hybrid system can take full advantage of the strong light harvesting capability of semiconductor and high selectivity of molecular catalyst. The interaction linker bridging the semiconductor and molecular catalyst plays an important role in supplying efficient electron transfer channels. In this study, both CdS with and without ethylenediamine functionalization (i.e., CdS-EF and CdS) have been successfully synthesized and further respectively coupled with tetra(4-carboxyphenyl)porphyrin iron(III) chloride (FeTCPP) for CO 2 photoreduction. It is found that CdS-EF exhibits inferior photocatalytic activity to CdS, while CdS-EF/FeTCPP hybrid photocatalyst shows much higher activity than CdS/FeTCPP. This is because hydrogen bonding exists between the amino groups in CdS-EF and carboxyl groups in FeTCPP, which can act as electron transfer channels from CdS to FeTCPP in the obtained hybrid system.
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高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-9
·
IF 3.125
Liu Mingyue,Gao Zhao,Yu Yanjun,Su Rongxin,Huang Renliang,Qi Wei,He Zhimin
4-Nitrophenol (4-NP) is a priority pollutant in water and is both carcinogenic and genotoxic to humans and wildlife even at very low concentrations. Thus, we herein fabricated a novel molecularly imprinted core-shell nanohybrid as a ratiometric fluorescent sensor for the highly sensitive and selective detection of 4-NP. This sensor was functioned by the transfer of fluorescence resonance energy between photoluminescent carbon dots (CDs) and 4-NP. This sensor was synthesized by linking organosilane-functionalized CDs to silica-coated CdSe quantum dots (CdSe@SiO 2 ) via Si–O bonds. The nanohybrids were further modified by anchoring a molecularly imprinted polymer (MIP) layer on the ratiometric fluorescent sensor through a facile sol–gel polymerization method. The morphology, chemical structure, and optical properties of the resulting molecularly imprinted dual-emission fluorescent probe were characterized by transmission electron microscopy and spectroscopic analysis. The probe was then applied in the detection of 4-NP and exhibited good linearity between 0.051 and 13.7 μg/mL, in addition to a low detection limit of 0.026 μg/mL. Furthermore, the simplicity, reliability, high selectivity, and high sensitivity of the developed sensor demonstrate that the combination of MIPs and ratiometric fluorescence allows the preparation of excellent fluorescent sensors for the detection of trace or ultra-trace analytes.
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PubMed
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 39
·395602
·
IF 3.551
Hongchao Geng,Ning Jiang,Chenyi Li,Xingqi Zhu,Yan Qiao,Qingyun Cai
A novel visible light-driven photocatalyst (represented as Mn-CdS/ZCISe/CIS/TiO2) for the passivation of E. coli was prepared with TiO2 nanowires as support and using CuInS2 (CIS) and ZnCuInSe (ZCISe) quantum dots (QDs), as well as Mn-doped CdS (Mn-CdS) nanoparticles (NPs) as sensitizers. The use of CIS and ZCISe QDs and Mn-CdS NPs extends the light harvest region to visible light. The photoelectric conversion efficiency was consequently improved, with a photocurrent density of 12.5 mA cm−2, about 60 times that of pure TiO2 nanowires. The germicidal efficiency of the photocatalyst was assessed by passivation of E. coli, 96% bacteria in 50 ml 105 colony forming units (CFU) ml−1 solution were killed within 50 min. Besides the high efficiency, the composite has good stability and satisfactory recycling performance. The antibiotic mechanism was also performed by using photoluminescence and a scavenging agent of different active matter, revealing that the photo-generated holes play a major role in the sterilization process.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Yonggang Lei,Yongchun Tong,Qingyun Wang,Yuqi Han,Xiaojuan Feng,Zhen Li,Shoubo Li,Kim Hoong Ng
A well-engineered heterojunction cocatalysts play a pivotal role in enabling efficient H 2 evolution over semiconductor materials. Herein, an effective cocatalyst derived from MoP/Mo 2 N heterostructure was proposed and incorporated to CdS for a drastically enhanced H 2 production from water under visible light irradiation. By optimizing catalytic formulation, the best-performing CdS@MoP/Mo 2 N(3 wt%) demonstrates a remarkable H 2 production rate of 10653 μmol h⁻¹g⁻¹ , representing an 18-fold enhancement compared to bare CdS. This remarkably high activity outperforms CdS enhanced by conventional noble metal cocatalysts (e.g., Ag, Au, Pt) and MoS x -based materials, underscoring the outstanding cocatalytic effect promised by MoP/Mo 2 N. In parallel, the optimized photocatalyst also achieved a remarkable stability for H 2 production over 9 consecutive cycles with a total irradiation time of 45 h, alongside a noticeably high apparent quantum efficiency (AQE) of 13.5 % upon irradiated by 420 nm-light. According to analysis, these enhanced performances are ascribed to the promoted interfacial charge transfer kinetics and significantly reduced hydrogen evolution overpotential of CdS@MoP/Mo 2 N(3 wt%), both of which contribute to the superior catalytic activity. Theoretical investigation also suggested a much-facilitated electron shuttling and proton desorption with MoP/Mo 2 N attached to CdS photocatalyst. Overall, this work demonstrates that our developed MoP/Mo 2 N heterostructure cocatalysts can effectively serve as alternatives to noble metals(Ag, Au, Pt) in solar-driven photocatalytic hydrogen production.
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