ACTA PHYSICO-CHIMICA SINICA
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2024
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IF 10.8
Asif Hassan Raza,Shumail Farhan,Zhixian Yu,Yan Wu
This work illustrates the novelty of double S-scheme ZnS/ZnO/CdS ternary heterojunction photocatalyst with efficient photocatalytic activity. The sample with optimal CdS content, ZnS/ZnO/CdS-14% (ZZC14%), displayed the maximum H 2 evolution rate of 4.1 mmol·g ‒1 ·h ‒1 . The maximum photocatalytic performance was approximately 2 and 13 times higher than their corresponding counterparts, ZnS/CdS and ZnO/ZnS, respectively. A high AQE of 19.8% under 420 nm was obtained. Additionally, the slight changes in H 2 evolution activities and retentions of crystal structures after six successive cycles indicate the stability of the photocatalyst. In accordance with the theoretical calculations and experimental results, the remarkable enhancement in photocatalytic activity is attributed to fast electron transfer and separation as well as the intimate contact due to mutual interaction between S-scheme. This work highlights an innovative approach to constructing a dual S-scheme photocatalytic system with high separation and fast migration capabilities of photogenerated charge carriers for splitting water to produce hydrogen. Download: Download high-res image (131KB) Download: Download full-size image
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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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Bing Zhang,Hongyun Meng,Xue Wang,Honghong Chang,Wenlong Wei
Mercuric ion (Hg 2+ ) as one kind of environmental pollutants has attracted more and more attentions due to its persistence, mobility and biological enrichment. In this study, a novel photoelectrochemical biosensor for Hg 2+ detection was constructed based on dye sensitization effect induced by Y-shaped DNA transformation as signal amplification strategy. Firstly, graphene oxide-ZnO-CdS nanohybrid (GO-ZnO-CdS) as photoelectric material was synthesized by simple hydrothermal method, and was employed to modify ITO electrode. Secondly, Y-shape DNA was labeled by Au NPs in the solution, and which crosslinked on the surface of GO-ZnO-CdS modified ITO electrode by carbodiimide coupling method, which resulted in the excitation energy transfer (EET) effect between Au NPs and CdS. Finally, in the presence of Hg 2+ , the structure of DNA on the modified electrode changed from Y-shape into hairpin accompanying the proximity of dye molecule based on T-Hg 2+ -T, which eliminated EET effect and triggered dye sensitization effect for enhancing photocurrent response. Under optimal conditions, the photocurrent linearly increased with the increasing of Hg 2+ levels in the range of 5 pM − 500 pM with the detection limit of 1:5 pM(LOD = 3σ blank / s ). More importantly, the developed biosensor showed the advantages of acceptable selectivity, repeatability and stability.
研究领域:
环境科学
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生物传感
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材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Rong-Rong Su,Yu-Xiang Yu,Yong-Hao Xiao,XianFeng Yang,Wei-De Zhang
CuSbS 2 is regarded as a promising photo-absorber for solar energy conversion due to its proper bandgap, high absorptivity and earth abundance. Herein, novel low-cost ZnO/CdS/CuSbS 2 core-shell nanowire arrays were constructed as photoanode for hydrogen evolution through non-aqueous electrodeposition and cation exchange. The nanowire demonstrates even and compact multilayer structure. The optimal ZnO/CdS/CuSbS 2 photoanode achieves a photocurrent of 6.48 mA/cm 2 at 0 V versus Ag/AgCl and the remarkable IPCE value with approximately 52% at 480 nm in an electrolyte solution containing 0.35 mol/L Na 2 SO 3 and 0.25 mol/L Na 2 S. It also exhibited a good stability, maintained 87.9% of the initial current after 1 h measurement. The high performance benefits from well-crystalline and compact multilayer structure, high absorptivity of CuSbS 2 and CdS, p-n junction formed between CdS and CuSbS 2 which promotes the electron-hole separation and ZnO nanowire array as three dimensional scaffolds for electron percolation pathway. This work suggests the potential applications of low-cost p-n junction core-shell nanowire arrays as a highly efficient photoanode for hydrogen evolution in oil-field waste water with reductive sulfide.
研究领域:
材料科学
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能源转换
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光电化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2015
·Vol. 27
·期 2
·1479-1484
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IF 1.569
Li Jing,Cao Jun,Zhang Xiufang,Wang Song,Zheng Yingying,Pan Jiaqi,Li Chaorong
The ZnO/CdS nanocomposites have been successfully synthesized on the electrospun cotton cellulose nanofibers (CCNFs). ZnO nanorods (70–80 nm in diameter and 1 μm in length) are uniformly grown on the CCNFs by a simple hydrothermal method firstly and then different amount of CdS nanoparticles (20–30 nm in diameter) are loaded on the ZnO nanorods by the chemical bath deposition method. The visible light photocatalytic activity of ZnO/CdS nanocomposites is investigated by degradation of Rhodamine B under visible light irradiation, and it demonstrates that the photocatalytic performance of this composites is significantly enhanced compared with that of pure ZnO. Furthermore, the relatively narrow band gap and novel nanostructure of the composites are considered as the main reasons of this enhancement.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Shuang Liang,Guozhe Sui,Jinlong Li,Dongxuan Guo,Ze Luo,Rongping Xu,Hong Yao,Chao Wang,Shijie Chen
This study presents a novel approach for synthesizing C–ZnO/CdS graded nanorods derived from metal–organic frameworks (MOFs) that can be applied as a catalyst for photocatalytic hydrogen evolution from pure water. Porous C-doped ZnO was prepared by a self-template method using imidazole-like metal–organic backbone (ZIF-L) as a precursor through a two-step calcination method. CdS nanoparticles were deposited on ZIF-L surface by chemical deposition . The two-step calcination method introduced elemental C, and the unique architecture of ZIF-L played an essential role in forming the hierarchical structure of the porous ZnO nanorods. Compared with other ZnO/CdS catalysts, the C-doped ZnO/CdS graded nanorods exhibited remarkable photocatalytic activity for hydrogen production . The highest hydrogen production rate of 20.25 mmol g −1 h −1 with an apparent quantum yield (AQY) of 24.7% at 365 nm obtained over C–ZnO/CdS with Pt as co-catalyst, which was 24.4 and 65.3 times higher than that over CdS (0.83 mmol g −1 h −1 ) and ZnO (0.31 mmol g −1 h −1 ), respectively. This outcome was attributed to (i) the formation of Z-scheme heterojunction that significantly promoted the separation and migration of photogenerated electron–hole pairs; (ii) C doping that reduced the bandgap of ZnO and broadened its spectral response range; and (iii) the ordered arrangement of porous nanorods that effectively reduced the recombination rate of the electron–hole pairs.
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
ECS Journal of Solid State Science and Technology
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2023
·Vol. 12
·期 7
·076009
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IF 2.2
Chengsha Huang,Jin Li
The low-temperature hydrothermal and water bath methods are used to manufacture CuS@ZnO/CdS catalyst. The Rhodamine B degradation rate constant of CuS@ZnO/CdS is around 1.53 × 10−2 min−1, which is 3.9 times greater than that of ZnO. The coupling of CdS and loading of CuS onto ZnO surfaces were evaluated using XRD, SEM, TEM, and XPS. SEM demonstrated that 5 mg of CdS was the most effective in controlling the shape of ZnO nanoflakes. Ultraviolet-visible absorption (UV–vis) and Photoluminescence (PL) spectra reveal that CdS and CuS decreased the bandgap of ZnO and boosted its ability to absorb visible light. Transient photocurrent response (TPR) and electrochemical impedance spectra (EIS) display that CdS and CuS facilitate the quick separation of photoexcited carriers in ZnO. Notably, the optimal weight ratio of CuS was determined to be 15%, since excessive amounts of CuS would operate as recombination centers and cover active sites. Additionally, the dual Z-scheme carriers movement mechanism was proposed using sacrificed agent experiments, and TOC analyzed the mineralization rate of RhB after degradation. In this study, CuS@ZnO/CdS photocatalyst degraded RhB nearly 99% in 80 min, which is superior to the earlier photocatalysts. Therefore, this article holds great significance in the practical application of metal chalcogenide-modified ZnO-based photocatalysts with superior visible light-induced degradation performance in environmental purification.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
OPTICAL MATERIALS
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2023
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IF 3.9
Chengsha Huang,Jin Li
ZnO nanosheets , 2D/1D ZnO/CdS hybrid and ternary ZnO/CdS/GO S-scheme heterojunction photocatalyst were fabricated by a low-temperature hydrothermal technique. As expected, by investigating the degradation efficiency of rhodamine B under simulated sunlight, with the assistance of CdS and GO, the ternary heterostructure showed superior photocatalytic activity . The test results display that the dye degradation rate constant of ZnO/CdS/GO is about 1.75 × 10 −2 min −1 , which is 3.6 times higher than that of bare ZnO. SEM results prove the finding that the content of CdS can regulate the size and distribution of ZnO NSs, increasing the specific surface area of the sample. Besides, the results of ultraviolet–visible (UV–vis) absorbance spectra revealed that the addition of CdS and GO significantly synergistically increased the visible light absorption of ZnO, and also shortened the band gap of ZnO. Photoluminescence (PL) spectra, electrochemical impedance spectroscopy (EIS) and transient photocurrent response (TPR) results show that the presence of CdS and GO synergistically promotes the rapid separation of photoexcited carriers in ZnO. Notably, the GO also further speeds up the transmission rate of electrons and improves the photoelectric stability of the ZnO/CdS heterogeneous photocatalyst. The above changes can effectively promote the photocatalytic performance of photocatalysts. Moreover, a reasonable S-scheme carriers migration mechanism was proposed with the assistance of Mott-Schottky (MS) test, VB-XPS and sacrificial agent experiments. Through comprehensive analysis and discussion, it can be concluded that ZnO/CdS S-scheme heterojunction and GO synergistically promote the photocatalytic performance of ZnO. Therefore, this thesis may provide a deeper insight into developing the practical application of ZnO-based heterojunction photocatalysts in pollutant degradation.
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
RSC Advances
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2017
·Vol. 7
·期 50
·31365-31371
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IF 3.108
Rong-Mei Kong,Yan Zhao,Yiqun Zheng,Fengli Qu
Zeolitic imidazolate frameworks (ZIF) are attracting considerable attention for their applications in adsorbents/separation as well as catalysis. In this article, we proposed a simple strategy to fabricate semiconductor–ZIF core–shell nanocomposites, which exhibited remarkable coherent function for adsorption and photocatalytic degradation of organic pollutants. The current nanocomposites were composed of ZnO/CdS and ZIF-8, where spindle-like ZnO nanoparticles not only acted as the seeding material but also worked as the Zn2+ source for the formation of ZIF-8. The as-prepared ZnO/CdS@ZIF-8 core–shell nanocomposites displayed distinct photocatalytic activity for methylene blue (MB) and rhodamine B (RhB) owing to the unique pore structure and thus absorption effect of the ZIF-8 shell. To this end, the ZnO/CdS@ZIF-8 core–shell nanocomposites could find important applications in photocatalytic degradation of pollutants.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MATERIALS TECHNOLOGY
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2020
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IF 1.738
Yusong Pan,Minyuan Yin,Hongjun Fang,Linfeng Xu,Haixian Yan,Chengling Pan
A novel ternary ZnO/CdS/GO heterostructure with boosting photocatalytic performance and stability was prepared by a simple hydrothermal method. The morphology, crystal structure, chemical composition and optical properties of the composite were thoroughly investigated. Results show that the obtained ZnO/2CdS/10GO composite exhibits the optimal activity towards RhB removal under sunlight irradiation, which is higher than that of pristine ZnO and CdS. The enhanced photocatalytic performance of the composite is attributed to the close heterostructure and excellent conductivity of GO. Besides, the radical trapping experiments revealed that superoxide radical (•O2−) and holes (h+) were the vital active species in the photocatalytic process. Meanwhile, the corresponding photocatalytic mechanism was also investigated. In all, this work supplies a facile route to design highly efficient and stable photocatalysts for water purification.
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
JOURNAL OF CATALYSIS
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2022
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IF 8.047
Songbo Wang,Pengjie Liu,Chengzhen Meng,Yidan Wang,Lei Zhang,Lun Pan,Zhen Yin,Na Tang,Ji-Jun Zou
Photoelectrochemical (PEC) water splitting is a promising approach to solve the current energy and environmental crises. Herein, we developed a “one stone, two birds” strategy to construct Au@Pt decorated ZnO/CdS heterojunctions (ZCAP) with Au-S bond and surface plasmon resonance (SPR) effect for promoted PEC water splitting. The optimized ZCAP structure exhibited the highest photocurrent density of 4.23 mA/cm 2 at 1.23 V vs. RHE and hydrogen evolution rate of 72.3 μmol·cm −2 ·h −1 , which is magnitude higher than pure ZnO. In-depth investigations indicate that SPR effect can afford hot electrons, whereas Au-S bonds over interface act as transmission bridge for facilitated electron transfer, the synergy of them achieves efficient charge separation and light utilization. Meanwhile, surface Pt nanoparticles serve as active sites for rapid charge transfer and promoted surface reaction. This article illustrates that the synergy of SPR and electron transfer bridge is an efficient strategy for promoted PEC performance.
研究领域:
材料科学
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能源科学
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化学工程
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Jun-Tao Cao,Xiao-Jing Liao,Yu-Ling Wang,Yan-Ming Liu
A novel photoelectrochemical (PEC) aptasensor for lead ion (Pb 2+ ) detection was proposed on the basis of the CdSe quantum dots (QDs) co-sensitized ZnO-CdS nanostructure and the specificity of aptamer. The CdSe QDs-capped cDNA, as a signal enhancement element, could hybridize with the aptamer on the sensing platform to generate a CdSe/CdS/ZnO dual co-sensitized structure, realizing a great enhancement in photocurrent response. In the presence of Pb 2+ , the aptamer on the sensing interface specifically bound with the Pb 2+ to form G-quadruplex structures, which greatly inhibit the hybridization between aptamer and CdSe QDs-cDNA, leading to a decrement of the photocurrent signal. As the concentration of Pb 2+ increased, the photocurrent response showed a diminishing tendency. Under the optimized conditions, the fabricated PEC aptasensor exhibited a linear response between photocurrent variation and the logarithm of Pb 2+ concentration in the scope of 1.0 × 10 −9 M to 1.0 × 10 −5 M with a detection limit of 3.4 × 10 −10 M. Moreover, the aptasensor has been applied in the determination of Pb 2+ in environmental water samples with the good selectivity .
研究领域:
分析化学
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环境科学
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纳米技术
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生物传感器
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Xi Zhu,Zhikun Li,Bolong Liang,Shijie Xing,Hongbin He,Xiliang Li,Shu-Xuan Liang
The continuous contamination of ciprofloxacin (CIP) pharmaceutical residues poses a potential risk to the ecological environment and human health. Using semiconductor materials with optimized heterojunctions for photodegradation is an effective way for the CIP removal. In this study, Fe-ZnO/CdS Z-type heterojunction was synthesized, and used for the photodegradation of organic pollutants. The Fe-doping brought abundant surface oxygen vacancies to ZnO, which could effectively promote interfacial electron transfer. In addition, the valence transition of Fe (II)/Fe (III) could effectively participate in the redox cycle and improve the carrier transfer efficiency. The construction of Z-type heterojunction facilitated the separation of photogenerated carriers, and the photogenerated electrons in the conduction band of CdS reduced oxygen to produce superoxide radicals as the main active radicals. A series of photoelectric characterizations had proved that the introduction of CdS could effectively improve the visible light utilization rate and photogenerated carrier separation efficiency. The Fe-ZnO/CdS system achieved 90.0% degradation efficiency of CIP within 120 min under visible light. Impressively, Fe-ZnO/CdS heterojunction showed practical degradation capability in complex aqueous environments and excellent reusability. This study provided an effective strategy for the design of metal oxide-based photocatalysts and offered a new idea for the removal of drug residual contaminants.
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高影响因子
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