JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Junhui Yi,Haoxian Zeng,Hai Lin,Minghao Li,Runkun Xie,Beifang Chen,Runsi Ding,Zhenghui Liu,Dehao Li,Ning Li
Rational design of Z-scheme heterojunction is known to be a good strategy for promoting photogenerated charge efficient separation. In this paper, a direct Z-scheme Ag 2 O/Bi 2 MoO 6 heterostructured microspheres with good interfacial properties were successfully prepared by hydrothermal synthesis-coprecipitation-calcination decomposition. Various techniques such as Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and powder X-ray diffraction (PXRD) were used to reveal the structure, morphology, composition, electrochemical and optical properties of the target product. The catalytic activity of the as-prepared composite was evaluated by visible light degradation of Rhodamine B (RhB) and transient photocurrent. As expected, the results showed that 1:5 Ag 2 O/Bi 2 MoO 6 exhibited the optimal catalytic performance. And the visible degradation efficiency is up to 86% in 90 min, which was 2.69 times higher than that of Bi 2 MoO 6 (32%). And 1:5 Ag 2 O/Bi 2 MoO 6 exhibited the highest photocurrent efficiency (0.8 μA/cm 2 ). Meanwhile, the efficiency of 1:5Ag 2 O/Bi 2 MoO 6 keep 90% after four cycles. The enhanced activity can be attributed to the formation of a good interfacial contact between Ag 2 O and Bi 2 MoO 6 . In addition, hole and superoxide were identified as the main active species. Eventually a possible direct Z-scheme mechanism was proposed to explain enhanced performance. This work may provide a new perspective for the rational design of excellent Bi 2 MoO 6 -based Z-scheme heterojunctions for environmental remediation.
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Crystals
·
2022
·Vol. 12
·期 9
·1286
·
IF 2.67
Yu Yan,Qi Zhang,Zhijian Wang,Qifeng Du,Ruitao Tang,Xiaoyu Wang
The performance of monochromatic perovskite light-emitting diodes (PeLEDs) has undergone rapid development in recent years, while white PeLEDs are still in their infancy. The tandem devices prepared by connecting light-emitting units of different colors with intermediate connectors comprise one of the promising approaches for realizing white light emission. The intermediate connector plays a crucial role in determining the effectiveness of the light-emitting units. In this work, all-perovskite-based white LEDs are assembled by employing sky-blue (490 nm) and red (690 nm) perovskite emitters as active layers. With mixed p-type and n-type organic charge transport materials as the intermediate connector, the highest external quantum efficiency (EQE) of the device was 1.4%, the electroluminescence (EL) peak position of the blue light part was shifted to 512 nm, and the red light part was shifted to 673 nm. In contrast, with organic and inorganic charge transport materials as the intermediate connector, the devices exhibited better charge generation/injection capabilities and a record EQE of 8.5%. The EL peak position of the device prepared from the stored film was not shifted, implying that the organic/inorganic layer effectively suppresses halide migration. Our work paves the way for highly efficient tandem white PeLEDs.Keywords:tandem;white perovskite light-emitting diodes;organic/inorganic intermediate connector
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Polymer Chemistry
·
2023
·Vol. 14
·期 7
·888-897
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IF 4.6
Yuting Min,Ruizhen Zhang,Xuli Dong,Lifang Zhang,Dongming Qi,Zan Hua,Tao Chen
A well-defined triblock light-responsive amphiphilic copolymer with nitrospiropyran as the middle block was prepared by reversible addition–fragmentation chain transfer (RAFT) polymerization. The polymeric micelles obtained by self-assembling of the copolymer in water exhibited reversible size changes upon ultraviolet (UV) and visible (Vis)-light irradiation, owing to the transition between the closed three-dimensional spiropyran (SP) and the open planar merocyanine (MC) form, and the corresponding transformation of hydrophobicity and hydrophilicity. The hydrophobic SP form of nitrospiropyran resulted in a larger core diameter, showing higher dye adsorption ability in methyl red adsorption experiments. Upon UV irradiation, the transition of SP to hydrophilic MC caused a decrease of the core diameter, displaying a higher catalytic reaction rate in the Knoevenagel condensation reaction when base-functionalized micelles were applied. This work presented facile light-regulated reversible size changes of polymeric micelles. We expect that the light-regulated strategy developed here would be useful in the fabrication of smart nanoreactors for dye adsorption, catalysis, etc. in a controllable manner.
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Nanomaterials
·
2023
·Vol. 13
·期 1
·214
·
IF 5.3
Liyun Yan,Jiahui Tang,Qing-an Qiao,Honglan Cai,Yuqi Dong,Juan Jin,Yanbin Xu,Hongwei Gao
Bi2MoO6was one of the important bismuth-based semiconductors with a narrow bandgap, and has been widely used in selective oxidation catalysts, supercapacitors, and energy-storage devices. A series of Bi2MoO6/ZnO composite photocatalysts with different mass ratios were synthesized by the hydrothermal method. The synthesized samples were characterized by XRD, PL, UV-Vis, SEM, TEM, XPS, and BET analysis techniques. Under visible light conditions, Methylene blue (MB) was used as the target degradation product to evaluate its photocatalytic performance. The results showed that the degradation rate constant of Bi2MoO6/ZnO (0.4-BZO) was about twice that of the traditional photocatalysis of ZnO. The Bi2MoO6/ZnO composite catalyst maintained stable performance after four consecutive runs. The high photocatalytic activity of Bi2MoO6/ZnO was attributed to the efficient electron transport of the heterojunction, which accelerates the separation of electron-hole pairs and reduces the probability of carrier recombination near the Bi2MoO6/ZnO heterojunction. Bi2MoO6/ZnO nanocomposites have potential applications in the field of photodegradation.Keywords:Bi2MoO6/ZnO nanocomposites;photocatalyst;degradation
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Mengdan Guan,Jin Wang,Kaili Wang,Junjie Wang,Rajkumar Devasenathipathy,Shunhao He,Liuyingzi Yu,Linrong Zhang,Haijiao Xie,Zhuoyao Li,Gang Lu
Photocatalytic evolution of hydrogen is becoming a research hotspot because it can help to produce clean energy and reduce environmental pollution. Titanium dioxide (TiO 2 ) and its composites are photocatalysts that are widely used in hydrogen evolution because of their high abundance in nature, low price, and high photo/chemical stability. However, their catalytic performances still need to be further improved, particularly in the visible light spectrum. Herein, visible light-driven photocatalytic evolution of hydrogen on Au/TiO 2 nanocomposite is enhanced ∼ 10 folds by selectively functionalizing the nanocomposite with cysteamine molecules. It is revealed that the amine group (–NH 2 ) in cysteamine favors the transfer and separation of photo-generated hot carriers. The rate of hydrogen produced can be further tuned by varying the ionization of the functionalized molecules at different pH values. This work provides a simple, convenient, and effective method that can be used to improve the photocatalytic evolution of hydrogen. This method can also be used for many other nanocatalysts (e.g., Au-MoS 2 , Au-BiVO 4 ) and catalytic reactions (e.g., carbon dioxide reduction, nitrogen reduction).
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PubMed
高影响因子
THIN-WALLED STRUCTURES
·
2022
·
IF 5.881
Danna Tang,Kai Yang,Tianyu Gao,Tingting Liu,Haibin Tang
Mechanical-electromagnetic integrated design has great potential in the development of electromagnetic shielding equipment for military use. In this study, Al 2 O 3 /SiO 2 ceramics with triply periodic minimal surfaces (TPMSs) were fabricated using digital light processing (DLP) technology. The preparation of SiO 2 and Al 2 O 3 powders is vital for DLP because minimal aggregates or sedimentation in the ceramic paste is required. Debinding and sintering programs were developed to prevent defects in the designed microstructure. The interfacial characterization demonstrated that the surfaces of the sintered ceramics were compact and smooth. The compression strength of the TPMS ceramic with a volume fraction of 50% was 24 MPa, which is relatively good among additively manufactured cellular ceramics. The TPMS structures also exhibited significant electromagnetic interference (EMI) shielding effectiveness in the X-band (2 to 18 GHz), and the shielding performance was adequate to meet the demands of electromagnetic shielding materials . Additive manufacturing of Al 2 O 3 /SiO 2 ceramic with TPMS architectures was successfully achieved by considering the mechanical-electromagnetic integration.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Fanghao Ye,Huibo Yan,Siyang Liu,Baoxing Liu,Zhiqing Zhang,Mengyao Tian,Ting Zheng,Xi Lan,Jincheng Huang,Chunfeng Meng,Ping Xu,Guijun Li
Perovskite light-emitting diodes (PeLEDs) have become a hot research topic in recent years and can now achieve an external quantum efficiency (EQE) of over 22% for green and red devices. However, the efficiency of blue PeLEDs, which are essential for display applications, lags far behind their green and red counterparts. The interface of the PeLEDs has a critical influence on the carrier transport and exciton recombination dynamics, and interface engineering is considered to be an effective strategy to improve the device performance. Herein, quaternary ammonium-based ionic liquids serve as an interfacial modification layer to significantly improve the device efficiency and stability. The interaction of quaternary ammonium cations with Pb(Br/Cl)6 octahedra promotes nucleation sites, which significantly improves the morphology of perovskite films and reduces the formation of defects in films. In addition, ion migration is also effectively suppressed in the device. As a result, with tributylmethylammonium bromide (TMAB) used as the interface layer, the EQE of the device is successfully increased from 3.5 to 6.7%, and the operational stability with a half-lifetime (T50) is increased by over 12 times. Our work provides a new class of interface modification materials toward high-performance blue PeLEDs.
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高影响因子
Catalysts
·
2022
·Vol. 12
·期 11
·1293
·
IF 4.501
Limeng Wu,Xin Yue,Ying Chang,Kunlei Wang,Jinyue Zhang,Jiajie Sun,Zhishun Wei,Ewa Kowalska
Monoclinic scheelite bismuth vanadate (BVO) microballs were prepared by a facile hydrothermal method and subsequently modified with 2 wt% of noble metals (NM = Au, Ag, Cu, Pt and Pd) by a photodeposition route. All materials were characterized by diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR). The photocatalytic performance was investigated by degradation of tetracycline antibiotic under visible light irradiation. Moreover, photocurrent generation under UV/vis was also examined. It was found that BVO modification with all tested NMs resulted in a significant improvement in photocatalytic performance. The highest activity was obtained for Cu/BVO with mainly oxidized forms of copper. Based on scavenger tests (∙O2−and ∙OH as the main responsible species for TC degradation) and redox properties, it was proposed that the Z-scheme mechanism between copper oxides and BVO was responsible for enhanced photocatalytic activity. However, the co-participation of zero-valent forms of NMs should also be considered, either as electron scavengers, plasmonic sensitizers or conductors. Presented data reveal that porous microballs, highly attractive for practical applications due to micro-sized diameter and efficient light harvesting inside the structure, could be efficiently used for environmental and energy purposes under solar radiation.Keywords:photocatalysis;BiVO4;degradation of pollutants;noble metals;photocurrent;surface modification
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高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
·
IF 5.999
Lerong Liu,Weizheng Song,Wan Zheng,Feihu Li,Hanlin Lv,Yuhang Wang,Yanjun Chen,Yifeng Wang
Multilayer beads made from biomacromolecules are useful for encapsulating, protecting, and delivering active ingredients such as drugs, dyes, and proteins. However, their encapsulated cargos are allowed to diffuse slowly out into the surrounding solvent during storage. This study describes a “smart” multilayer bead that can achieve zero leakage for encapsulated materials during storage and controlled release after triggered by near-infrared (NIR) light. The innermost layer of the multilayer bead containing Fe 3 O 4 magnetic nanoparticles is prepared based on the thermal-responsive sol-gel transition of agar, which offers magnetic responsiveness to the bead. The middle layer of the bead embedding gold nanorods (Au NRs) is produced by the ionic crosslinking between alginate and terbium ions. Moreover, encapsulated materials (drugs, dyes, and agrochemicals) are loaded in the middle layer. The outermost layer of the bead, a paraffin-wax shell, is formed at 75 ℃ through the phase transition of paraffin wax . Because of the protection of the paraffin-wax shell, the encapsulated materials present zero leakage when the multilayer bead is placed in aqueous solutions for at least six weeks. Under the irradiation of 808 nm NIR light for 1 min, the multilayer bead is heated up to 50 ℃ by the photothermal effect of Au NRs in the middle layer, which triggers the melting of the paraffin-wax shell. Then, the controlled release of the encapsulated materials can be achieved by the rest of the bead. Furthermore, the bead can be recycled after the release due to its magnetic responsiveness. Consequently, the multilayer bead is a novel, green and economical candidate for diverse applications, especially for the encapsulation and controlled release of hydrophilic materials in bio-related applications.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhen-Dong Lian,Bo Wang,Zhi-Sheng Wu,Hao Lin,Shan-Shan Yan,Jie-Lei Li,Kang Zhang,Qing-Guang Zeng,Jin-Cheng Xu,Shi Chen,Shuang-Peng Wang,Kar Wei Ng
CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) have shown great potential in numerous applications including wide color gamut display and lighting. Despite the wonderful luminescence properties, the inherent instability of these NCs hinders their use in practical situations. Herein, we report a facile aqueous-based, ligand-free method to synthesize highly stable CsPbX3 NCs using ZIF-62, a metal–organic framework, as an encapsulation matrix which effectively isolates CsPbX3 from the surrounding. We discovered that the slightly alkaline nature of ZIF-62 facilitates the reaction between water and PbBr2 to form PbBr(OH), which not only passivates the surface defects of the CsPbBr3 NCs but also prevents the perovskite from decomposing or oxidizing at high temperature. Sintering of ZIF-62 can therefore be performed in air at ∼300 °C to completely seal the perovskite within the insulating matrix, resulting in CsPbBr3/ZIF-62 composites exhibiting high stability against polar solvents, heat, light, and ambient humidity. Notably, the composite can maintain its bright luminescence without noticeable degradation in water for more than 2 months. The narrow-band emission and stability of these composites led to the demonstration of white light-emitting diodes with excellent color stability. Without the need for organic solvents during NC synthesis and noble gas ambient during sintering, the strategy proposed here can potentially facilitate the cost-effective, large-scale synthesis of highly stable perovskites which show great promise in commercial applications.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 7
·2101-2107
·
IF 5
Jianhao Qiu,Lu Zhang,Guanglu Xia,Dingliang Dai,Yong Tang,Jianfeng Yao
Different ligand functionalized UiO-66 (UiO-66-X, X = OH, (OH)2 and NH2) were prepared and then modified by ZnIn2S4 lamellas to form ZnIn2S4/UiO-66-X heterostructures for visible-light-driven H2O2 evolution in pure water. The H2O2 yields using ZnIn2S4/UiO-66-NH2, ZnIn2S4/UiO-66-(OH)2 and ZnIn2S4/UiO-66-OH are 799, 733 and 165 μmol L−1, respectively, which are 9.5, 8.7 and 2.0 times that of ZnIn2S4/UiO-66. The high performance of ZnIn2S4/UiO-66-NH2 and ZnIn2S4/UiO-66-(OH)2 is ascribed to the benign visible-light response and Z-scheme heterostructures, and the H2O2 evolution abides by indirect O2 reduction with ˙O2− as an intermediate species. Additionally, H2O2 yields using ZnIn2S4/UiO-66-NH2 on tap water and Xuanwu Lake (Nanjing, China) water can be comparable to that on the above-deionized water. This study sheds light on the great promise of functionalized MOFs and their applications on green (photo)catalytic energy conversion.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 2
·589-595
·
IF 3.925
Jinrui Liu,Zhuojiong Xie,Jingyuan Lin,Ziming Liu,Qihang Su,Fengping Peng
Converting the naturally available mechanical energy and solar energy into chemical energy holds great promise for exploiting renewables. Here, by coupling the piezoelectric effect of ZnO and the plasmon resonance of Ag nanoparticles, we construct a binary catalytic system, which can capture hydromechanical energy from fluids and visible light energy from sun to drive the degradation of tetracycline. Our research demonstrated that the mechanical stirring induced an inner electric field across the piezoelectric ZnO, while the light irradiation triggered plasmonic hot carriers in Ag NPs. These hot carriers injected into ZnO would be utilized to drive piezoelectric catalytic reactions. Our study broadens the horizon of piezo catalysis by utilizing low-density mechanical energy and coupling it with plasmonic photocatalysis.
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