JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 20
·8721-8735
·
IF 3.5
Wang Yifan,Wang Lele,Li Qi,Wu Jianning,Meng Guihua,Yang Shengchao,Liu Zhiyong,Tai Yanlong,Liu Jichang
Photocatalytic overall water splitting (POWS) is a promising route for converting solar energy into green and sustainable energy. Herein, we report a facile hydrothermal approach to fabricate polyhedron BiVO 4 by Mo and Yco-doping (MYB) photocatalysts with suitable band gap for POWS. The MYB exhibited enhanced visible light-driven POWS activities in comparison with that of as-prepared BiVO 4 , Y-BiVO 4 and M-BiVO 4 , with the maximum H 2 and O 2 evolution rate of 34.7 and 17.4 μmol·h −1 ·g −1 , respectively. The optimum activity of the catalyst was controlled by adjusting Mo content of MYB. The photodeposition of Pt shows that there are special separation reduction and oxidation centers on the surface of MYB. Electrochemical experiments further confirmed the enhanced charge separation of MYB. MYB photocatalyst has small particle size, unique polyhedral structure, large specific surface area and high (103) and (200) surface exposure, thus improving POWS performance, high electron transfer efficiency and effective separation of photogenerated electron–hole pairs. Because of the doping of Mo and Y elements, the electronic structure of the catalyst is altered, enhancing light absorption and reducing the recombination of photogenerated electron–hole pair. The current study revealed that the MYB products could serve as cost-effective and stable photocatalysts for POWS. Graphical Abstract
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Jinyang Liu,Qiqi Liao,Chengcai Li,Xueliang Jiang,Jiuming Li,Wangyong Jin,Guojin Liu,Yuhai Guo,Bin Yu,Hailin Zhu
Being a low-energy, reusable, and environmentally friendly degradation technology, photocatalysis has excellent application prospects in textile dye wastewater degradation. In this study, we combine the advantages of photocatalysis and membrane technology to prepare photocatalytic membranes that immobilize the photocatalyst and alleviate membrane pollution. Dual-precursor graphitic carbon nitride (U6M1) was composited with Bi 12 TiO 20 (BTO) using the annealing method to prepare a novel Δ(Z + II)-type BTO/U6M1 photocatalyst with visible-light response capacity. Subsequently, BTO/U6M1/PES composite photocatalytic membranes were fabricated using the nonsolvent-induced phase separation (NIPS) method, and the photodegradation activity of the composite membranes was executed against rhodamine B (RhB) dye. The results indicated that the composite membrane exhibiting the best photocatalytic performance achieved nearly 100 % degradation of RhB within 120 min. Furthermore, the membrane with optimal photocatalytic performance retained photocatalytic activity for five consecutive dye degradation tests, demonstrating its reusability.
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JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 54
·期 1
·598-608
·
IF 2.2
Deng Wenqiang,Liao Runhua,Liang Boyu,Du Jie,Zhang Wenbin,Fu Xin,Li Shuyao,Hong Yan,Fu Lichun
In this research, a BiOI/C 3 N 5 heterostructure was synthesized using a solvothermal technique to prevent the recombination of photoexcited electrons and holes. The morphology, structure, and mechanism of the material were investigated using x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), x-ray photoelectron spectroscopy (XPS), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), energy-dispersive x-ray spectroscopy (EDS), electron paramagnetic resonance (EPR), and photoluminescence (PL) spectroscopy, among other tests. The photocatalytic performance of the heterostructure was evaluated through the degradation of tetracycline hydrochloride (TCH). Results showed that compared to C 3 N 5 and BiOI alone, the formation of the heterostructure significantly enhanced the photocatalytic efficiency, achieving 1.5 times the degradation efficiency of pure C 3 N 5 and twice that of BiOI. Under optimal conditions, the composite material degraded nearly 90% of TCH within 180 min, and after five cycles, it still exhibited degradation efficiency of 76.19%, demonstrating its good recyclability and stability. The main active species involved in the photocatalytic degradation of TCH were found to be superoxide radicals (•O 2 − ) and holes (h + ). This work not only provides a new approach to the design of photocatalytic degradation materials but also offers a novel method for effectively degrading organic pollutants.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Lianke Zhang,Ruidan Zhang,Shuaishuai Zhang,Peng Sun
A composite photocatalyst KCN/LFO was synthesized using K-modified g-C 3 N 4 (KCN) and LaFeO 3 (LFO). The photocatalytic activity of the KCN/LFO was evaluated by degrading indole (heterocyclic organic compound). The KCN/LFO-10 (mass fraction of LaFeO 3 with 10%) displayed the highest removal rate of indole. Indole was degraded to 97.366% after 60 min. The photocurrent and electrochemical impedance spectroscopy (EIS) results suggested that the close correlation between KCN and LaFeO 3 can increasing the efficiency of photogenerated carrier separation. The capture experiment results demonstrated that ·O 2 − and ·OH is primary active substance, respectively. Moreover, the degradation efficiency of KCN/LFO-10 to indole remains stable at 87% after four successive experiments of indole photocatalytic degradation. This work presents an effective method for addressing the pollution caused by heterocyclic organic compound .
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ChemistrySelect
·
2024
·Vol. 9
·期 33
·e202402724
·
IF 1.9
M. Z. Jin,J. Li,D. Song,F. F. Jing,W. W. Lu,X. Y. He,T. Wang,R. T. Yu
Graphical A dendritic nano-polymer was synthesized and used as a photocatalyst for H 2 O 2 production and Tetracycline/ Rhodamine B degradation under a 36 W incandescent bulb. The yield of H 2 O 2 is 8.4 mg g −1 h −1 , and the photocatalytic degradation rates of Rh B and TC can reach 93.9 % and 72.92 %, respectively. A process for photocatalytically synthesizing hydrogen peroxide while simultaneously degrading organic pollutants is of interest. In this study, a dendritic nanopolymer was synthesized and utilized as a photocatalyst for the production of hydrogen peroxide, which was then used in tandem with the degradation of Tetracycline (TC) and Rhodamine B (Rh B) organic pollutants under a 36 W incandescent bulb. The yield of H 2 O 2 was measured at 8.4 mg g −1 h −1 , with photocatalytic degradation rates of 93.90 % for Rh B and 72.92 % for TC. The degradation kinetics of TC and Rh B by the dendritic polymer were found to follow pseudo-first-order kinetics, and a higher affinity for degradation was observed for Rh B. The photocatalytic degradation mechanism of TC in a Fenton-like system was attributed to an oxidation system involving hydrogen peroxide and ferrous ions.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jiahui Chen,Yue Meng,Zhiling Huang,Bo Xie,Zheming Ni,Shengjie Xia
Defect engineering advantages include regulating the band structure of photocatalytic materials, inhibiting the recombination of photoelectron-hole pairs, and promoting the conversion of photogenerated electrons into active radicals. In this paper, bismuth molybdate (Bi 2 MoO 6 ) photocatalysts with double vacancies (V Bi-O -BMO) were prepared by solvothermal and ionic eutectic solvent methods. EPR, TEM, and XPS results confirmed the successful construction of oxygen and bismuth vacancies on Bi 2 MoO 6 . The photocatalytic performance of the prepared catalysts was investigated by photodegradation of levofloxacin hydrochloride (LVF) under visible light. The double vacancies markedly enhanced the photocatalytic properties of Bi 2 MoO 6 , with the photodegradation rate of V Bi-O -BMO reaching 88.36 % for 40 mg/L LVF within 60 min. Kinetic studies have demonstrated that the reaction rate constant of V Bi-O -BMO can reach 0.0351 min −1 , which is 3.2 times higher than that of bulk-BMO. This can be attributed to the favorable synergistic effect of oxygen and bismuth double vacancies. V O not only captures oxygen and electrons, facilitating the generation of superoxide radicals ( O 2 − ), but also elevates the conduction band position and boosts the reduction capability of Bi 2 MoO 6 . V Bi not only captures photogenerated holes (h + ) to directly impact LVF degradation, but also promotes interfacial charge transfer and inhibits the recombination of electron-hole pairs. Furthermore, the intermediates and degradation pathways of LVF photodegradation were surmised based on the LC-MS analysis. The reaction mechanism of LVF photodegradation by V Bi-O -BMO was elucidated through the application of the free radical pathway. This study demonstrates a methodology for the creation of double vacancies in catalysts and the significant potential of V Bi-O -BMO for the remediation of antibiotic residues in water under visible light.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Zhouyuanye Wan,Hongjie Zhang,Meihong Niu,Yanzhu Guo,Haiming Li
The digital light processing (DLP) 3D printing technology enables the construction of hydrogels with high precision and complex structures. In this work, a hydrogel precursor solution with excellent printing performance was developed through a chemical and physical dual cross-linking strategy. The printed poly(acrylamide–acrylic acid)/N,N′-bis(vanillinidene)ethylenediamine1–carbomer1 (P(AM–AA)/N,N′-BVE1–CBM1) hydrogel exhibited excellent tensile strain (685%), tensile strength (0.37 MPa), Young’s modulus (157 kPa), and toughness (1075 kJ/m3), as well as good adhesion properties and self-healing ability. Notably, its shape memory properties enable it to recover quickly after deformation and show excellent strain response characteristics, enabling reliable and stable conversion of human motion into electrical signals, and it is very suitable as a flexible sensor for monitoring human body motion. With remarkable precision and customization ability to fabricate unique structures and excellent response behavior, the P(AM–AA)/N,N′-BVE1–CBM1 hydrogel based on DLP 3D printing is promising in the field of personalized wearable flexible sensors.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yun Wang,Jian Chen,Huilin Zhou,Chenxi Liu,Yanfeng Chen,Junmin Xia,Qingqing Yang,Lihui Liu,Shufen Chen
Although metal halide perovskites (MHPs) have demonstrated remarkable external quantum efficiencies (EQEs) in red and green light-emitting diodes (LEDs), the blue ones confront efficiency and stability problems due to the high defect density in the perovskite films. Large amounts of defect passivation strategies are successfully developed to improve the device performance. Nevertheless, the influence of the molecular configuration of the passivators on the perovskite crystallization process has not been comprehensively investigated so far. Here, we investigate the effect of the phenyl ring on the perovskite crystallization dynamics and the passivation effect. The additive with a phenyl ring performs the π–π stacking ability with phenethylammonium (PEA+) molecules, resulting in a deteriorated crystallinity and a weakened passivation ability. Conversely, the additive without the phenyl ring is helpful to promote the participation of PEA+ molecules in the crystalline process, leading to a higher crystallinity and a stronger passivation effect. As a result, the EQE of the blue perovskite LED has increased from 4.72 to 11.06% by using the phenyl ring-free additive. Therefore, it is advisible to develop the conjugated nonplanar additives in the PEA+-assisted quasi-two-dimensional perovskites. This finding may enlighten the rational design of defect passivators for highly efficient perovskite LEDs.
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Light-Science & Applications
·
2025
·Vol. 14
·期 1
·1-8
·
IF 23.4
Liu Yiting,Sun Yingying,Yan Xiaohan,Li Bo,Wang Lei,Li Jianshun,Sun Jiahui,Guo Yaqi,Liu Weipeng,Hu Binbin,Lin Qingli,Fan Fengjia,Shen Huaibin
Solution-processed quantum dot light-emitting diodes (QLEDs) hold great potential as competitive candidates for display and lighting applications. However, the serious energy disorder between the quantum dots (QDs) and hole transport layer (HTL) makes it challenging to achieve high-performance devices at lower voltage ranges. Here, we introduce “giant” fully alloy CdZnSe/ZnSeS core/shell QDs (size ~ 19 nm) as the emitting layer to build high-efficient and stable QLEDs. The synthesized CdZnSe-based QDs reveal a decreased ground-state band splitting, shallow valence band maximum, and improved quasi-Fermi level splitting, which effectively flatten the energy landscape between the QD layer and hole transport layer. The higher electron concentration and accelerated hole injection significantly promote the carrier radiative recombination dynamics. Consequently, CdZnSe-based device exhibits a high power conversion efficiency (PCE) of 27.3% and an ultra-low efficiency roll-off, with a high external quantum efficiency (EQE) exceeding 25% over a wide range of low driving voltages (1.8-3.0 V) and low heat generation. The record-high luminance levels of 1,400 and 8,600 cd m -2 are achieved at bandgap voltages of 100% and 120%, respectively. Meanwhile, These LEDs show an unprecedented operation lifetime T 95 (time for the luminance to decrease to 95%) of 72,968 h at 1,000 cd m -2 . Our work points to a novel path to flatten energy landscape at the QD-related interface for solution-processed photoelectronic devices.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jianxing Liu,Zhe Li,Lin Nie,Xiangxin Xue,Mao Liu
Photocatalytic nitrogen fixation is a promising long-term strategy for NH 3 synthesis, with the development of effective and durable photocatalysts being crucial for achieving high-efficiency N 2 to NH 3 conversion. In this study, we employed vacancy and interface engineering to create bismuth (Bi) nanoparticles on hierarchical oxygen-deficient BiOBr microspheres using a one-step solvothermal approach. These Bi-decorated BiOBr microspheres, featuring oxygen vacancies, achieved a high photocatalytic ammonia synthesis rate of 222.3 μmol·g −1 ·h −1 in pure water under visible light irradiation, which is 3.25 times higher than that of the original BiOBr. Atomic-scale images of the interface between the defective regions of BiOBr and the Bi cocatalyst and several other material characterizations confirmed that the enhanced photoreduction activity of Bi/BiOBr is due to the synergistic effects of the metal Bi and the oxygen vacancies. These results present a straightforward and practical method for designing efficient photocatalysts for nitrogen fixation.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yongjian Chen,Xiankan Zeng,Cheng Yan,Shiyu Yang,Lunyao Pan,Chenglong Li,Maolin Mu,Wen Li,Guanqi Tang,Weiqing Yang
Charge carriers will recombine outside the emitting layer (EML) in non-ideal perovskite light-emitting diodes (PeLEDs), which can lead to parasitic loss and be detrimental to the performance of PeLEDs. Here, we have subtly utilized the property of perovskite nanocrystals (NCs) to design and optimize the homogeneity and optical property of EML, thereby suppressing the undesired carrier loss behavior in system. Photoluminescence (PL) spectra with transmission electron microscopy (TEM) images show that smaller and more homogeneous NCs in size are obtained by temperature-controlled (TC) method. Atomic force microscopy (AFM) images and temperature-dependent PL spectra show that EML with better optical property and uniformity is fabricated. The multiscale capacitance characterization shows that the device with modified EML exhibits significantly reduced leakage current, while the increased specific surface area between electron transport layer (ETL) and EML substantially reduces charge accumulation. Additionally, multiscale reactance, impedance and phase angle responses, reveal that the carrier oscillation behavior in the optimized device is suppressed compared to control group, leading to less energy loss. Consequently, the optimized devices exhibit lower leakage current and superior electroluminescent properties. The luminance is increased from 31650 cd/m 2 to 72941 cd/m 2 , current efficiency (CE) is improved from 59.9 cd/A to 94.3 cd/A, and the external quantum efficiency (EQE) rises from 12.6 % to 19.7 %, corresponding to improvement of 230 %, 157 %, and 156 %, respectively. This research provides valuable insight into the impact of functional layer morphology on carrier dynamic behavior in PeLEDs.
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OPTICS EXPRESS
·
2025
·Vol. 33
·期 16
·34913-34923
·
IF 3.3
Haoyuan Song,Lingfeng Du,Shaochi Lin,Wei Huang,Kun Wang,Kun Wang,Xiongtu Zhou,Xiongtu Zhou,Yongai Zhang,Yongai Zhang,Yongai Zhang,Chaoxing Wu,Chaoxing Wu,Chaoxing Wu
Quantum dots (QDs)-based light-emitting metal-insulator-semiconductor junction (LE-MISJ) devices currently face challenges of low brightness and short lifetime. The degradation mechanisms of the device remain poorly understood. In this work, to explore carrier dynamics and QDs degradation mechanism in the QDs layer, we construct a LE-MISJ device consisting of electrode/insulator/monolayer QDs/electrode to investigate its photoelectric properties. It is found that continuous carrier injection and carrier transport between QDs lead to electric field-induced dielectric breakdown between QDs, accelerating the formation of defects on the surface of QDs and leading to QD degradation. Experimental and theoretical analyses demonstrate that filling the QDs gap with poly(methyl methacrylate) (PMMA) effectively protects and supports surface ligands and reduces carrier-induced damage. The device with 2% PMMA shows 180% enhanced peak electroluminescence intensity and spectral narrowing (full width at half maximum from 38.8 nm to 31.2 nm) compared to PMMA-free controls. Moreover, the device with 2% PMMA decays to 80% of the original intensity in 4.5 times the time of the device without PMMA. This study can provide some research value to understand the working principle and optimization of LE-MISJ.
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