VACUUM
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2024
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IF 3.8
Zonghan Hu,Qi Wang,Zihang Wang,Lanlan Zhang,Chengwei Hu,Yuanhu Lei,Yupei Qiao,Bing Lv
Currently, the two predominant heterojunction types, namely type II and S-scheme heterojunctions, are extensively employed in photoelectrochemical (PEC) water splitting for hydrogen production. However, type II heterojunctions suffer from the drawback of diminished oxidation-reduction capability. In this work, S-scheme CdIn 2 S 4 /CuS (CIS/CuS) heterojunction nanoblocks (NBs) photoanode is constructed for the first time by a hydrothermal and the successive ionic layer adsorption and reaction (SILAR) methods. The heterojunction achieves a photocurrent density of up to 4.0 mA/cm 2 at 0 V vs. Ag/AgCl, 2.37 times that of the pure CIS NBs photoanode. X-ray photoelectron spectroscopy (XPS), Tauc plots, Mott-Schottky (M − S) tests and density functional theory (DFT) calculations reveal the formation of S-scheme band structure between the interface of CIS and CuS. As a result, the significantly enhanced PEC water splitting performance of CIS/CuS NBs photoanode is attributed to the superior light absorption ability of CuS and the effective charge separation achieved by S-scheme band structure between the interface of CIS and CuS. This work also provides new ideas and strategies for designing efficient S-scheme heterostructures for efficient PEC water splitting.
研究领域:
材料科学
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能源科学
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物理化学
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2019
·Vol. 95
·期 3
·665-674
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IF 2.659
Yating Liu,Ming Li,Qingyan Zhang,Picai Qin,Xiandong Wang,Guannan He,Ling Li
BACKGROUND The photocatalytic activity of a pristine semiconductor is unsatisfactory due to the rapid recombination of photogenerated electrons and holes. Constructing composite photocatalysts has proven to be an effective method to suppress electron–hole recombination. The composites composed of two materials usually are synthesized through a two-step process. However, in this work, a simple one-step solvothermal method employing an homogeneous reaction system was adopted to synthesize a tungsten trioxide (WO 3 )-copper sulfide (CuS) nanosheet heterojunction with enhanced photocatalytic properties. RESULTS The formation of the WO 3 -CuS heterojunction was confirmed by X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray and X-ray photoelectron spectroscopy analysis. The composites showed improved visible light harvesting ability, and enhanced photoelectric and photocatalytic properties compared with pure WO 3 . The optimized composite displayed a photocurrent almost five-fold greater than the sum of the photocurrents of WO 3 and CuS, and had superior performance for methylene blue (MB) degradation and hexavalent chromium [Cr(VI)] reduction. The MB degradation and Cr(VI) reduction efficiencies were both improved when they co-existed in the photocatalytic system. Interferential ions Cl − and NO 3 − were much less effective in the degradation of MB than in the reduction of Cr(VI). CONCLUSIONS Improved photocatalytic activity was achieved after coupling CuS with WO 3 , due to the enhanced visible light absorption and efficient electron–hole separation. Photogenerated holes were found to be the dominant reactive species in the MB photodegradation process. A synergistic effect existed between MB degradation and Cr(VI) reduction. Interferential ions Cl − and NO 3 − had much greater effect on Cr(VI) reduction than MB degradation. © 2019 Society of Chemical Industry
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
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2017
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IF 2.625
Zhilan Cai,Yuming Zhou,Shuaishuai Ma,Shiwei Li,Haiyong Yang,Shuo Zhao,Xi Zhong,Wenting Wu
A novel g-C 3 N 4 /CuS p - n heterostructured photocatalyst has been fabricated through an in situ synthesis technique. The samples were characterized through X-ray diffraction, energy dispersive spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and UV–vis spectroscopy. And the results indicated that CuS nanoparticles were closely anchored on the surface of g-C 3 N 4 with good dispersion. The g-C 3 N 4 /CuS heterojunctions exhibited enhanced photocatalytic performance in degradation of RhB and MB than that of pure g-C 3 N 4 and CuS, and the selected sample of g-C 3 N 4 /CuS-2 displayed the best photocatalytic activity. The degradation rates of RhB and MB with g-C 3 N 4 /CuS-2 photocatalyst were 8.914 and 13.543 times higher than that of pure g-C 3 N 4 , and 3.023 and 6.373 times higher than that of pure CuS, respectively. The enhancement of photocatalytic activity may be ascribed to the matched overlapping band structure and the interaction between CuS and g-C 3 N 4 . The interaction between g-C 3 N 4 and CuS would not only improve the optical absorption property of g-C 3 N 4 , but also create more interface for the efficiently transfer of photo-generated electron-hole pairs to restrict the recombination, which was proved by the photoluminescent spectra. Moreover, a possible photocatalytic mechanism has been tentatively proposed according to the experimental results.
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
RSC Advances
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2022
·Vol. 12
·期 52
·34107-34116
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IF 4.036
Chuanfeng Zang,Hao Chen,Xiangye Han,Wei Zhang,Junfang Wu,Fanghua Liang,Jiamu Dai,Hongchao Liu,Guangyu Zhang,Ke-Qin Zhang,Mingzheng Ge
PVDF/ZnO/CuS photocatalysts with ZnO/CuS heterojunctions were synthesized via electrospinning, hydrothermal, and ion-exchange techniques. As matrix materials, electrospun PVDF nanofibers are easy to be recycled and reused. ZnO nanorods anchored on PVDF nanofiber with high specific surface area provide abundant active reaction sites for photocatalysis. While the loaded CuS nanoparticles as a photosensitizer compensate the low quantum efficiency of ZnO and improve the visible-light photocatalytic efficiency. As a result, the PVDF/ZnO/CuS composited photocatalyst exhibits outstanding photocatalytic performance in exposure to UV and visible light owing to the suppressed recombination of electron–hole pairs and widened visible light absorption range. The kinetic constants of PVDF/ZnO/CuS nanocomposites under UV irradiation (9.01 × 10−3 min−1) and visible light (6.53 × 10−3 min−1) irradiation were 3.66 and 2.53 times higher than that of PVDF/ZnO (2.46 × 10−3 min−1 & 2.58 × 10−3 min−1), respectively. Furthermore, PVDF/ZnO/CuS nanocomposites demonstrate excellent robustness in terms of recycling and reuse, which is advantageous in practical applications.
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
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
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IF 7.3
Chenyang Guo,Haoran Chen,Jiaofeng Ye,Jingmin Ran,Libang Feng,Yanhua Liu,Jianbin Zhang,Dianming Li
The simultaneous integration of high strength, toughness, and self-healing capacity in a single material has presented significant challenges. Additionally, most self-healing systems require external stimuli like artificial light or heat to activate the repair process. This study addressed these issues by incorporating TiO 2 /CuS heterojunction nanocrystals into a dynamic oxime-urethane-based polyurethane with metal-coordination interactions. The heterojunction broadened the material's light absorption to entire-spectrum sunlight, enabling the synthesized polyurethane to achieve efficient solar-driven self-healing. The resulting polyurethane exhibited a high healing efficiency of 98.6 % under sunlight, along with outstanding mechanical properties including a tensile strength of 28.43 MPa, elongation at break of 1755 %, toughness of 261.7 MJ/m 3 , and fracture energy of 246.64 kJ/m 2 . Meanwhile, the TiO 2 /CuS heterojunction also endowed the material with strong antibacterial properties, demonstrating a 99 % antibacterial rate. This work resolved the inherent conflict between mechanical performance and self-healing efficiency through the synergistic design of heterojunction nanocrystals and dynamic bonds. It provided a new strategy for developing high-strength, tough materials with effective sunlight-responsive self-healing capabilities. The resulting material holds great potential for applications in smart coatings, flexible electronics, wearable devices.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Yifang Wu,Jianwang Wu,Mei Lin,Zuliang Chen
Zero-valent metal catalysts are capable of generating hydrogen peroxide (H 2 O 2 ) through oxygen activation. However, their sensitivity to pH and tendency toward surface passivation considerably restrict practical applications. In this study, a ZVC/CuS heterojunction catalyst with sulfur vacancies was successfully fabricated via the hydrothermal method. The catalyst leveraged the synergistic effect between sulfur vacancies and lattice sulfur to first mediate oxygen adsorption on its surface, enabling efficient on-site H 2 O 2 generation and activation. Density functional theory (DFT) calculations confirmed that *OOH served as the key intermediate in the H 2 O 2 formation pathway. Under neutral conditions, the ZVC/CuS self-Fenton system enabled complete (100 %) removal of 17β-estradiol (E2). Electrochemical analyses revealed that the current density of ZVC/CuS was 2.1 times higher than that of ZVC, indicating a substantial enhancement in redox activity. DFT, Liquid chromatography-mass spectrometry (LC-MS) analysis combined with toxicity assessments were collectively employed to deduce the degradation pathways of E2, confirmed that the toxicity of the degradation products was significantly reduced compared to the original pollutants. Importantly, comprehensive experiments under various conditions consistently demonstrated high efficiency in removing pollutants, highlighting the practical potential of ZVC/CuS. This study not only provides a novel strategy to overcome the instability of ZVC but also establishes a highly efficient self-Fenton-like catalytic system that does not require exogenous oxidants.
研究领域:
环境催化
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高级氧化工艺
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材料科学
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水处理
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理论化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）