Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2022
·
IF 3.407
Lianqing Yu,Xingyu Zhao,Jiandong He,Lijie Duan,Yankun Wang,Yaping Zhang,Haifeng Zhu
It is extremely desirable to develop efficient and cheap water splitting photocatalysts. An ultrahigh performance and stable photocatalyst g-C 3 N 4 /Zn 0.5 Cd 0.5 S was prepared by simple sintering method. g-C 3 N 4 nanosheets are evenly distributed around 20–30 nm ZnCdS nanoparticles, which can accelerate carriers separation and transfer, and increase the carriers life-time from 4.1 ns to 5.5 ns. UV–vis absorption spectra demonstrate that their absorption range can reach to visible light edge of 539 nm. The photocatalyst has a high photocatalytic hydrogen evolution rate of 16.66 mmol•h −1 •g −1 under visible light illumination (λ = 400–780 nm). Furthermore, after six recycles of photocatalyst, the hydrogen evolution stability still remains 94%. The excellent photocatalytic performance is attributed to the Z-scheme energy band structure formed between g-C 3 N 4 and Zn 0.5 Cd 0.5 S by simple sintering method. This work provides significant progress toward the synthesis of cheap Z-scheme photocatalysts for practical applications.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Wenjuan Fan,Hui Chang,Wenju Pang,Yufeng Li,Chuanhai Xiao,Yan Jiang,Zhiqiang Jiang,Guangfu Yin
Designing photocatalysts with excellent morphology from MOF is a promising strategy to improve photocatalytic H 2 evolution. Herein, a three-dimensional (3D) honeycomb-like Zn 0.5 Cd 0.5 S -140 assembled by ultra-thin nanosheets with an average thickness of about 1.5 nm was constructed using a novel 3D metal–organic framework (namely PZH-139) as template. Notably, the micromorphology could be tuned and the balance between conduction band (CB) position and band gap could achieve by adjusting the Zn/Cd molar ratio of Zn x Cd 1-x S. In a series of Zn x Cd 1-x S -140 photocatalysts derived from MOF, Zn 0.5 Cd 0.5 S -140 exhibited the highest hydrogen evolution rate (26.32 mmol h −1 g −1 ) by visible-light-driven with an apparent quantum efficiency (AQE) of 29.92 %, which was 6, 11 and 23 times higher than that of I-Zn 0.5 Cd 0.5 S (irregular morphology Zn 0.5 Cd 0.5 S), S-Zn 0.5 Cd 0.5 S (spherical Zn 0.5 Cd 0.5 S) and B-Zn 0.5 Cd 0.5 S (bulk Zn 0.5 Cd 0.5 S) prepared by traditional non-MOFs derived-methods, respectively. The excellent photocatalytic performance could be attributed to the synergism of the larger specific surface area, the balance between CB position and band gap, rapid carriers transfer and the enhanced light absorption capability. More importantly, this rare strategy for constructing highly efficient ultra-thin nanosheet assembled 3D honeycomb-like Zn 0.5 Cd 0.5 S -140 derived from MOF can flourish the design ideas of photocatalysts with specific excellent morphology.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 5
·2884-2892
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IF 9.3
Lindong Xia,Wenzhen Qin,Yu Xie,Yiqiao Wang,Yun Ling
Improving the separation efficiency of photo-generated electron–hole pair is a key issue in the field of photocatalytic hydrogen production. In this work, we successfully improved the efficiency of photo-generated carrier separation using the synergistic action of sulfur (S) vacancies and a Ni2P co-catalyst. Vs-Zn0.5Cd0.5S (Vs-ZCS) with S vacancies was designed and constructed, and Vs-ZCS/Ni2P photocatalysts were prepared with non-precious metal Ni2P as a co-catalyst. Among all the produced materials, Vs-ZCS/Ni2P-5% has a photocatalytic characteristic of 40.81 mmol g−1 h−1, which is 7.88, 3.08 and 3.75 times greater than those of ZCS (5.18 mmol g−1 h−1), Vs-ZCS (13.25 mmol g−1 h−1) and ZCS/Ni2P-5% (10.88 mmol g−1 h−1), respectively. The results of transient photo-current, electrochemical impedance spectroscopy, photoluminescence and time-resolved fluorescence show that the synergistic effect of S vacancies and Ni2P significantly promotes the separation and transfer efficiency of photo-generated carriers, as well as the photocatalytic hydrogen production reaction. Superoxide radicals and electrons are the active species for photocatalytic hydrogen generation, which is confirmed by active species capture tests and EPR. This study presents an innovative approach for developing photocatalysts with low cost and good catalytic performance.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 9
·1943-1955
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IF 7.779
Yang Yang,Xiuzhen Zheng,Jiafang Liu,Zhulin Qi,Tianyue Su,Chun Cai,Xianliang Fu,Sugang Meng,Shifu Chen
To achieve high photocatalytic efficiency of H2 evolution, promoting the utilization rate of photogenerated charge carriers by photocatalytic synergistic reaction is an efficient strategy. In this work, Co3S4/Zn0.5Cd0.5S nanocomposites with Co3S4 derived from ZIF-67 were successfully prepared through a simple hydrothermal method. Under visible light irradiation, Co3S4/Zn0.5Cd0.5S exhibited high photocatalytic activities in a H2 production system coupled with selective oxidation of benzyl alcohol. Moreover, 3% Co3S4/Zn0.5Cd0.5S showed the optimal activity (7.67 mmol g−1 h−1), greatly improved compared to that of Zn0.5Cd0.5S (1.62 mmol g−1 h−1). The reasons for the improved photocatalytic performance were seriously investigated by a variety of measurements and can be attributed to the enhanced visible light absorption and more efficient electron–hole pair separation. This study provides a good strategy to construct photocatalysts with metal–organic frameworks (MOFs) and efficient charge separation for highly efficient H2 production.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yidong Sun,Xingpu Wang,Qiang Fu,Chunxu Pan
Photocatalytic decomposition of water for hydrogen production is considered a promising solution to address the issues of energy crisis and environmental pollution. Herein, a kind of novel hollow flower-like 0D/3D Zn 0.5 Cd 0.5 S/NiCoZn-LDH with an n-n heterojunction is synthesized via precipitation and cation-exchange methods. Photocatalytic experiments reveal that the composite photocatalyst exhibits excellent performance compared with pure Zn 0.5 Cd 0.5 S. In other words, the composite photocatalyst shows enhanced response to visible light, three-fold increased transient photocurrent, and the hydrogen production rate reaching to 1100 μmol/h/g, approximately 7.3 times higher relative to pure Zn 0.5 Cd 0.5 S. The reaction mechanism is also elucidated. Zn 0.5 Cd 0.5 S/NiCoZn-LDH shows a type II n-n heterojunction, which can effectively transfer and separate the photo-generated electrons and holes, and is beneficial for the photocatalytic hydrogen production reaction. The synthesized composite photocatalyst is prepared using a simple method, enabling future large-scale production and applications.
研究领域:
材料科学
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能源科学
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Yidong Sun,Xingpu Wang,Qiang Fu,Chunxu Pan
It is of great significance to construct heterojunctions using industrially produced co-catalysts. The direct Z-scheme composite photocatalyst provides an effective separation of photogenerated carriers. Herein, a kind of novel 2D/3D direct Z-scheme NiFe-LDH/Zn0.5Cd0.5S is prepared. Compared with fresh catalysts, the NiFe-layered double hydroxide (LDH)/Zn0.5Cd0.5S composite exhibits advantages including excellent visible light response ability and photoelectric performance and improved H2 evolution rate by 11.6 times. Combining with theoretical calculations, ESR, XPS, and experimental results, the direct Z-scheme mechanism of the photocatalytic reaction is proposed. There is a channel for electron transfer between Zn0.5Cd0.5S and NiFe-LDH, and the electrons of Zn0.5Cd0.5S directly combine with the valence band holes of NiFe-LDH. Finally, the electrons remaining on NiFe-LDH can reduce H+ to generate H2. This process effectively achieves separation of photogenerated carriers and increases photocatalytic H2 evolution.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Zaofen Wang,Di Yang,Yunzhu Tan,Xu Liu,Xinyu Zhang,Zhenchao Wang,Danping Chen,Bingqian Liu
A rapid photoelectrochemical (PEC) sensor was constructed for nitrite detection in food based on the one-step chemical etching strategy of BiOCl/Zn 0.5 Cd 0.5 S (BOC/ZCS) nanocomposites by nitrite. BOC/ZCS heterojunction was prepared by a simple coprecipitation method, and it was found that BOC/ZCS showed significant photoelectrochemical (PEC) activity. The results of this study confirmed that the decrease in the photocurrent of the sensor was linked to the etching of ZCS by nitrite under acidic conditions. Under optimized conditions, the BOC/ZCS-based PEC sensor showed good analytical properties for detecting nitrite, with linear ranges of 1–100 μM and 100–600 μM. The detection limit of the sensor was 0.41 μM (S/N = 3). Excellent repeatability, reproducibility, low background noise, and immunity to interference were demonstrated using the proposed system, and satisfactory results were achieved for the nitrite assay using real samples. These results demonstrate a new method for nitrite detection developed using the proposed PEC sensor.
研究领域:
分析化学
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材料科学
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食品科学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Shen-wei Bai,Hui Mei,Zhi-peng Jin,Shan-shan Xiao,Lai-fei Cheng
In this article, we for the first time synthesized a series of SiC@Zn 0.5 Cd 0.5 S core-shell Z-scheme nanostructure, with the thickness of the shell varies from 12 nm to 60 nm, and the excellent photocatalytic exists because of the Z-scheme heterojunction mechanism. The Z-scheme system of SiC@Zn 0.5 Cd 0.5 S core-shell structure was proven by the in situ irradiated X-ray photoelectron spectroscopy, the system separated the photo-generated electron-hole pairs, and the core-shell structure performed better photocatalytic properties than Zn 0.5 Cd 0.5 S on the hydrogen production under UV–vis light irradiation. With decreasing of the shell thickness, the transient photocurrent response of the SiC@Zn 0.5 Cd 0.5 S increased and the photoluminescence decreased, anticipating the creation, collection, transportation of electrons/holes increased, and the electrons/holes recombination suppressed. The hydrogen production rate enhanced to 334% comparing with pure Zn 0.5 Cd 0.5 S, showing the advantage of SiC@Zn 0.5 Cd 0.5 S core-shell Z-scheme heterojunction nanostructure.
研究领域:
材料科学
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能源科学
·
光催化
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 39
·期 6
·928-932
·
IF 2.726
Xu Zhonghang,Wu Yuanyu,Tao Ran,Jin Zhanbin,Fang Xuedong
I n recent years, many effective photocatalysts have been developed to solve the problem of environmental pollution and clean energy shortage. In this paper, non-noble metal cocatalyst Ni 3 N nanoparticles supported Zn 0.5 Cd 0.5 S(ZCS) nanorods(Ni 3 N/ZCS) composites were successfully synthesized by ultrasonic method. The hydrogen production efficiencies of the photocatalysts were tested under visible light, which was found that when the loading of Ni 3 N was 2% of the mass of ZCS, and the Ni 3 N/ZCS composite had the best hydrogen evolution performance, which could reach 70.3 mmol·h −1 ·g −1 . In addition, the quantum efficiency under 420 nm monochromatic light irradiation was 27.2%. Through different characterization analyses, such as X-ray diffraction(XRD), scanning electron microscopy(SEM), and UV-Vis diffuse reflectance spectra(DRS), a possible photocatalytic mechanism was proposed, providing some reference value for non-precious metals as cocatalysts.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Zhanbin Jin,Tingting Wei,Jiayu Huang,Fengyan Li,Yi Yang,Lin Xu
In this work, a novel direct Z-scheme g-C 3 N 5 /Zn 0.5 Cd 0.5 S (CN/ZCS) heterojunction was successfully synthesized. Furthermore, its photocatalytic activity for hydrogen production was also investigated, whose photoluminescence spectrum revealed the charge transfer procedure of g-C 3 N 5 and ZCS. Moreover, the optimized hydrogen production rate of ZCS with 15 wt% of g-C 3 N 5 (15% CN/ZCS) was about 142.8 mmol/h/g and quantum efficiency (Q.E.) was circa 33.7% under 420 nm monochromatic light. Compared with the pure ZCS and ZCS with 2 wt% of Pt, the 15% CN/ZCS composite exhibited considerable improved hydrogen production rate, which was about 20 times and 7 times, respectively. The formation of CN/ZCS composite resulted in faster separation of the photogenerated electron-hole pairs. Our work may supply valuable data for the application of g-C 3 N 5 on photocatalysis .
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Guangye Ge,Shaoteng Yuan,Qingzhi Liu,Defeng Yang,Jinsheng Shi,Xuefang Lan,Kefeng Xiao
The development of low-cost photocatalysts for highly efficient and durable photocatalytic H 2 evolution under visible light is of great challenge. In present study, a Z-scheme Cu 3 P/Zn 0.5 Cd 0.5 S is fabricated via in-situ phosphidation method for efficient visible-light-driven H 2 evolution. The wide light absorption property of Cu 3 P enhances the visible light absorption of Cu 3 P/Zn 0.5 Cd 0.5 S. The electrical conductivity of metallic Cu 3 P and the Z-scheme constructure of Cu 3 P/Zn 0.5 Cd 0.5 S accelerate electron transport rate. The Cu 3 P/Zn 0.5 Cd 0.5 S catalyst achieves highest hydrogen evolution rate of 2.7 mmol g −1 h −1 , which is 3.1 folds higher than that of pristine Zn 0.5 Cd 0.5 S. More interestingly, the Cu 3 P/Zn 0.5 Cd 0.5 S exhibited increasing H 2 production during reaction. The further reduction of PO 3 3− →P &− and the further formation of Cu 3 P is determined to be the key reason for increasing activity. Besides, Cu 3 P/Zn 0.5 Cd 0.5 S prepared by in-situ phosphidation method shows much better catalyst property and performance than that prepared by afterwards mixing method, and the possible reasons for such difference is proposed in present study.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yanyan Chen,Minghui Yu,Xiaoyu Gong,Yingjie Wang,Shenjie Li,Qi Hu,Shuang Wang,Hao Yu,Zhiqiang Li
Two kinds of Ag 2 S-Zn 0.5 Cd 0.5 S heterostructural photocatalysts were synthesized via a simple two-step hydrothermal method. The photochemical (PEC) properties of Zn 0.5 Cd 0.5 S nanoparticles modified by Ag 2 S are closely related to the reaction time of Zn 0.5 Cd 0.5 S nanoparticles. Compared with the Ag 2 S-Zn 0.5 Cd 0.5 S heterostructure prepared at low temperature, the Ag 2 S-Ag-Zn-Cd-S composite prepared at high temperature has higher charge transfer/separation efficiency and longer carrier life. The photocatalytic performance of Ag 2 S-Ag-Zn-Cd-S composites for the degradation of Rhodamine B (RhB) under visible light irradiation (λ = 420 nm) was significantly improved. The AZCS-180-4 h photocatalyst exhibited the highest degradation efficiency (83.1% within 40 min) with a rate constant of 0.0401 min −1 which exhibited prominent stability and repeatability, and can still maintain high photocatalytic activity after at least four cycles. Meanwhile, the study of photocatalytic mechanism shows that the photo-induced h + radical is the predominant active species in this photocatalytic system, followed by·OH and·O 2- play a secondary role.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）