JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Huan Wen,Shu Chen,Jian Zuo,Jie Zhang,Canjun Liu,Yang Liu,Keke Wang,Hezhang Chen,Yong Pei
The primary challenge in enhancing the efficiency of solar energy conversion lies in improving the charge separation efficiency for photocatalytic (PC)/photoelectrochemical (PEC) processes, and the construction of heterojunctions represents one of the most effective strategies for promoting charge separation in the bulk phase. However, further investigation is necessary to elucidate the impact of the heterojunction interface structure on charge separation. In this paper, CdS/CdO and CdO/CdS films were prepared using an in-situ phase transformation approach to achieve a well-defined heterojunction interface structure for comparison. The research findings reveal significant disparities in the initiation potential and charge separation efficiency between CdS/CdO and CdO/CdS, with CdS/CdO exhibiting superior PEC properties. Notably, the photocurrent density of CdS/CdO reaches 6.5 mA cm −2 at 1.23 V RHE . This can be attributed to the fact that the favorable alignment of the built-in electric field (BEF) in CdS/CdO with the applied bias direction facilitates efficient charge separation and transmission at the heterojunction interface, as supported by the experimental results, density functional theory (DFT) calculations and finite element analysis (FEA). This finding offers a novel insight for the design and fabrication of high-performance heterojunction photocatalysts and photoelectrocatalysts.
研究领域:
材料科学
·
光电化学
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2015
·Vol. 17
·期 3
·1-15
·
IF 2.184
Liu Yingbo,Li Zhen,Yu Libo,Sun Shuqing
In this work, the influences of cationic precursors on the quality of photoelectrode, consequently on the performance of the quantum dot-sensitized solar cells (QDSCs) have been studied. CdS QDSCs have been prepared using successive ionic layer absorption and reaction (SILAR) method. Three cadmium precursors including nitrate (Cd(NO 3 ) 2 ), chloride (CdCl 2 ), and acetate (Cd(Ac) 2 ) were employed for the synthesis and absorption of CdS nanoparticles on nanostructure TiO 2 film. The loading amount and nanoparticle size of the CdS on mesoporous TiO 2 film showed a significant difference while using various cadmium precursors in the same SILAR cycles. Both the light-harvesting ability and the obtained incident photon-to-current conversion efficiency values show the trend of deposition rate caused by cadmium precursors. Further, it was proposed that an effective cationic precursor could provide a good connection between QD sensitizer and TiO 2 interface by electrochemical impedance spectroscopy analysis. Under AM 1.5 G full one sun illumination, the final power conversion efficiency of CdS QDSC based on Cd(Ac) 2 was 2.10 %, and PCE values of 1.57 and 1.20 % were obtained for solar cells sensitized by CdS QDs prepared by CdCl 2 and Cd(NO 3 ) 2 , respectively. The cationic precursor effect was further applied in PbS/CdS co-sensitized solar cells. The PbS/CdS QDSCs based on acetate cationic precursors provide a photocurrent of 19.24 mA/cm 2 and PCE of 3.23 % in comparison with 11.26 mA and 2.13 % obtained with nitrate acetate salts. Noticeably, the CdS and PbS/CdS QDSCs based on various cationic precursors prepared by SILAR exhibited good photocurrent stability under several light on–off cycles.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 32
·11201-11208
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IF 7.059
Yang Mi,Yaoyao Wu,Jinchun Shi,Sheng-Nian Luo
Single-mode micro/nanolasers have been of considerable interest for their potential applications in optical communication and high-resolution spectroscopy. However, constrained by large radiation loss and insufficient gain in microcavities, realizing high-performance single-mode micro/nanolasers is still challenging. In this work, single-mode whispering-gallery-mode lasing is demonstrated from single-crystal CdS microflakes with a sharp linewidth (∼0.12 nm) and a high quality factor (Q ∼ 4200) at room temperature. Such lasers are superior to previous CdS lasers in these lasing parameters. Through time-resolved photoluminescence measurements, electron–hole plasma recombination is established to be the lasing mechanism. The radiative recombination rate of CdS microflakes is enhanced by a factor of ∼4.7 due to the Purcell effect. These CdS microflake single-mode lasers can be potentially useful in optoelectronic devices.
研究领域:
光子学
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纳米光子学
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光电子器件
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激光物理
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 49
·2006166
·
IF 16.836
Bao Jin,Nian Zuo,Zhi-Yi Hu,Wenjun Cui,Renyan Wang,Gustaaf Van Tendeloo,Xing Zhou,Tianyou Zhai
P–n photovoltaic junctions are essential building blocks for optoelectronic devices for energy conversion. However, this photovoltaic efficiency has almost reached its theoretical limit. Here, a brand-new excitonic photovoltaic effect in 2D CsPbBr 3 /CdS heterostructures is revealed. These heterostructures, synthesized by epitaxial growth, display a clean interface and a strong interlayer coupling. The excitonic photovoltaic effect is a function of both the built-in equilibrium electrical potential energy and the chemical potential energy, which is generated by the significant concentration gradient of electrons and holes at the heterojunction interface. Excitingly, this novel photovoltaic effect results in a large open-circuit voltage of 0.76 V and a high power conversion efficiency of 17.5%. In addition, high photodetection performance, including a high photoswitch ratio ( I light / I dark ) of 10 5 and a fast response rate of 23 µs are obtained. These findings provide a new platform for photovoltaic applications.
研究领域:
材料科学
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光电子学
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 9
·1515
·
IF 5.3
Mengyu Fu,Dongzi Xu,Xiaoxia Liu,Yuji Gao,Shenghong Yang,Huaifeng Li,Mingming Luan,Pingping Su,Nianxing Wang
Semiconductive photocatalytic materials have received increasing attention recently due to their ability to transform solar energy into chemical fuels and photodegrade a wide range of pollutants. Among them, cadmium sulfide (CdS) nanoparticles have been extensively studied as semiconductive photocatalysts in previous studies on hydrogen generation and environmental purification due to their suitable bandgap and sensitive light response. However, the practical applications of CdS are limited by its low charge separation, which is caused by its weak ability to separate photo-generated electron-hole pairs. In order to enhance the photoelectrochemical activity of CdS, a polymer based on viologen (PHV) was utilized to create a series of PHV/CdS hybrid films so that the viologen unit could work as the electron acceptor to increase the charge separation. In this work, various electrochemical, spectroscopic, and microscopic methods were utilized to analyze the hybrid films, and the results indicated that introducing PHV can significantly improve the performance of CdS. The photoelectrochemical activities of the hybrid films were also evaluated at various ratios, and it was discovered that a PHV-to-CdS ratio of 2:1 was the ideal ratio for the hybrid films. In comparison with CdS nanoparticles, the PHV/CdS hybrid film has a relatively lower band gap, and it can inhibit the recombination of electrons and holes, enhancing its photoelectrochemical activities. All of these merits make the PHV/CdS hybrid film as a strong candidate for photocatalysis applications in the future.Keywords:CdS nanoparticles;viologen;photoelectrochemical redox materials;hybrid films
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jinhua Xiong,Xinyu Bi,Song He,Changsheng Cao
Herein, CdS nanorods (CdS-NR) was synthesized through a simple and facile solvothermal method. XRD pattern and TEM/HRTEM images indicated that hexagonal CdS nanorods with a diameter of 10 nm were successfully prepared. When used as electrocatalyst for CO 2 reduction reaction (CO 2 RR), CdS-NR afforded an excellent electrocatalytic performance in aqueous electrolyte. In comparison with commercial CdS nanoparticles (CdS-NP), CdS-NR could trigger the electroreduction of CO 2 to CO with a higher faradic efficiency and current densities. The enhanced electrochemical performance of CdS-NR than that of CdS-NP were ascribed to its enhanced adsorption of CO 2 , charge transfer ability and more exposed active sites. More importantly, it was noticed that H 2 generated along with CO, and the generated gas products with controllable ratios exhibited impressive potentials to directly using as syngas.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 48
·73282-73291
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IF 5.19
Sun Yubing,Xiao Jingting,Huang Xinshui,Mei Peng,Wang Huihui
CdS-based composites as the highly efficient photocatalyst have been extensively investigated in recent years due to the suitable band gap and high photocatalytic efficiency. In this study, the effect of various factors (pH, U(VI) concentration, contents, and types of photocatalyst) on photocatalytic reduction of U(VI) by MoS 2 /CdS composite was investigated. The optimized experimental conditions (e.g., pH 7.0, 20 mg/g U(VI), and 1.0 g/L photocatalyst) was obtained by batch techniques. Approximately 97.5% of U(VI) was photo-catalytically reduced into U(IV) by 2.5 wt% MoS 2 /CdS composite within 15 min. After 5 cycles, 2.5 wt% MoS 2 /CdS composite still exhibited the high removal efficiency of U(VI) under 50-min irradiation, indicating the good stability. The photo-reduction mechanism of U(VI) on MoS 2 /CdS composite was attributed to the O − 2 radicals by quenching experiments, ESR, and XPS analysis. The findings indicate that CdS-based catalyst has a great potential for the photocatalytic reduction of uranyl in actual environmental remediation.
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高影响因子
ANALYST
·
2012
·Vol. 137
·期 16
·3697-3703
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IF 4.23
Xiaomei Zhao,Shiwei Zhou,Qingming Shen,Li-Ping Jiang,Jun-Jie Zhu
A novel glutathione (GSH) photoelectrochemical biosensor was fabricated using the newly synthesized graphene–CdS (GR–CdS) nanocomposites. The GR–CdS nanocomposites were prepared by a fast, one-step, aqueous reaction. The as-prepared GR–CdS structure inherited the excellent electron transport of GR and facilitated the spatial separation of photo-generated charge carrier, therefore resulting in the enhanced photocurrent, and making it a promising candidate for developing photoelectrochemical biosensors. The proposed GSH sensor displays satisfactory analytical performance with an acceptable linear range from 0.01 to 1.5 mmol L−1 with a detection limit of 0.003 mmol L−1 at a signal-to-noise ratio of 3, and also shows an excellent specificity against anticancer drugs and can be successfully applied for GSH detection in real samples. The as-synthesized GR–CdS nanocomposites exhibited obviously enhanced photovoltaic properties, which could be extended to the detection of other enzymes and biomolecules, thus providing a promising platform for the development of photoelectrochemical biosensors.
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高影响因子
CRYSTENGCOMM
·
2015
·Vol. 18
·期 7
·1090-1095
·
IF 4.034
Xueyu Zhang,Xin Ge,Shihan Sun,Yuanduo Qu,Wenzhong Chi,Chuandong Chen,Wei Lü
As a newly developed material system, graphene-based three-dimensional (3D) architectures have been receiving considerable attention due to their multifunctional properties. Herein, we explore the synergistic effect of combined CdS and graphene hybrids in 3D architectures and investigate their application in electrochemical energy storage. A facile hydrothermal procedure is used to prepare 3D reduced graphene oxide/CdS (RGO/CdS) hydrogels, and three different morphologies of CdS (ball-like, rod-like, needle-like) in the hydrogels are obtained by controlling the synthesis conditions. The results showed that the morphology of CdS significantly affects the electrochemical properties of RGO/CdS. The electrode prepared with needle-like CdS nanoparticles exhibited the highest specific capacitor value of 300 F g−1 at a scan rate of 5 mV s−1, which shows outstanding cycling stability with 94% capacitance retention after 1000 cycles of charge/discharge. These findings demonstrate the possible application of 3D RGO/CdS architectures in energy storage.
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高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Zhi-Kai Shen,Yong-Jun Yuan,Pei Wang,Wangfeng Bai,Lang Pei,Shiting Wu,Zhen-Tao Yu,Zhigang Zou
Exploiting an appropriate strategy to prepare fine crystal quality black phosphorus nanosheet (BPNS) catalyst is a major challenge for its practical application in catalysis. Herein, we address this challenge by developing a rapid electrochemical expansion strategy for scale preparation of fine crystal quality BPNSs from bulk black phosphorus, which was demonstrated to be an active cocatalyst for photocatalytic nitrogen fixation in the presence of CdS as a photocatalyst. The transient photocurrent and charge density studies show that the BPNSs can efficiently accelerate charge separation of CdS, leading to the enhanced photocatalytic activities of BPNS/CdS nanocomposites for nitrogen fixation. The 1.5% BPNS/CdS photocatalyst exhibits the highest photocatalytic activity for nitrogen fixation with an NH3 evolution rate of 57.64 μmol·L–1·h–1. This study not only affords a rapid and simple strategy for scale synthesis of fine crystal quality BPNSs but also provides new insights into the design and development of black phosphorus-based materials as low-cost metal-free cocatalysts for photocatalytic nitrogen fixation.
研究领域:
材料科学
·
催化化学
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PubMed
高影响因子
Research
·
2021
·
IF 0
Yao Chen,Dong Yang,Yuchen Gao,Runlai Li,Ke An,Wenjing Wang,Zhanfeng Zhao,Xin Xin,Hanjie Ren,Zhongyi Jiang
The rational design of an outer shell is of great significance to promote the photocatalytic efficiency of core-shell structured photocatalysts. Herein, a covalent organic framework (COF) nanoshell was designed and deposited on the cadmium sulfide (CdS) core surface. A typical COF material, TPPA, featuring exceptional stability, was synthesized through interfacial polymerization using 1, 3, 5-triformylphloroglucinol (TP) and p-phenylenediamine (PA) as monomers. The nanoshell endows the CdS@TPPA nanosphere with ordered channels for unimpeded light-harvesting and fast diffusion of reactants/products and well-defined modular building blocks for spatially charge separation. Moreover, the heterojunction formed between CdS and TPPA can further facilitate the effective charge separation at the interface via lower exciton binding energy compared with that of pristine TPPA. By modulating the thickness of TPPA nanoshell, the CdS@TPPA nanosphere photocatalyst with the nanoshell thickness of about 8±1 nm exhibits the highest photocatalytic H2 evolution of 194.1 μmol h-1 (24.3 mmol g-1 h-1, 8 mg), which is superior to most of the reported COF-based photocatalysts. The framework nanoshell in this work may stimulate the thinking about how to design advanced shell architecture in the core-shell structured photocatalysts to achieve coordinated charge and molecule transport.
研究领域:
材料科学
·
能源化学
·
光催化技术
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DOI
POLYMER
·
2023
·
IF 4.6
Ming Gao,Chun-jiang He,Xue Geng,Lin Ye,Ai-ying Zhang,Zeng-guo Feng
When γ-CDs were self-assembled with a distal 2-chloropropionyl terminated poly (ethylene glycol) (PEG-2Cl) in aqueous solution, two distinct polypseudorotaxanes (PPRs), a single stranded one and a double stranded one were identified from the upper clear solution and the lower precipitates, respectively. Moreover, if the chlorine groups in PEG-2Cl were converted into the azido groups to give a bifunctional azido terminated PEG (PEG-2N 3 ) and then subjected to the inclusion complexation with γ-CDs, two similar double stranded PPRs were lyophilized from the upper and lower layer products. To probe whether the parallel or bent double stranded PPRs were created from the self-assembly of γ-CDs with PEG-2N 3 , the in situ copper-catalyzed azide/alkyne cycloaddition (CuAAC) was conducted to transform the resulting PPRs into the PRs using propargylamine monosubstituted β-CDs (PA-β-CDs) as bulky stoppers. After thorough purification, both the upper and lower layer products lyophilized therefrom were revealed the same parallel double stranded PRs by spectral and thermal analyses.
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高影响因子
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