JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yaowei Wei,Ke Zhou,Xianghuan Meng,Xiangyu Sun,Zhao Ma,Zhenzhen Li,Daming Zhuang
Due to the low toxicity and abundance of nature, Cu 2 ZnSn(S,Se) 4 (CZTSSe) has been considered as a promising solar cell material. The absorber is the most critical structure in a solar cell, which determines the performance of the cell. Selenium-rich CZTSSe can be formed by replacing S atoms of CZTS with Se. However, the method of adding Se element through H 2 Se is constrained due to the toxicity of H 2 Se. The work adopted a method to prepare excellent CZTSSe absorbers without H 2 Se. The stack structure CZTS precursor films were prepared by solution-based deposition, and CZTSSe absorbers were obtained after selenization annealing at 550 °C with 0.1, 0.2 and 0.3 g of selenium powders in argon, respectively. The obtained CZTSSe absorbers had pure CZTSSe phase, high absorption coefficients and appropriate bandgaps. After annealing with 0.2 g of selenium powder, the holes in the CZTSSe film diminished, and the grain size of absorbers increased from 0.31 µm in the CZTS absorber to 1.17 µm. The peaks of Se 3d for CZTSSe absorber were observed, the lattice spacing of plane (112) increased from 3.10 Å to 3.22 Å, and the work function decreased from 5.31 eV to 5.19 eV. The improved performance of absorber will be of great significance for the efficiency of CZTSSe device.
研究领域:
材料科学
·
太阳能电池研究
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产品关联
DOI
高影响因子
TETRAHEDRON
·
2018
·
IF 2.377
Jie Zhu,Wenhui Zhu,Ping Xie,Charles U. Pittman,Aihua Zhou
A novel and efficient Ni-catalyzed aryl- and alkyl-selenation of imidazo[1,2-α]pyridines employing selenium powder has been developed for the first time. The significant advantages of this protocol are that it is an inexpensive nickel catalyst and exhibits broad functional-group compatibility and good reaction yields.
研究领域:
有机化学
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催化化学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Ruixin Sun,Jinxing Zhao,Ouyang Lin,Yu Li,Xiulin Xie,Wentao Niu,Zhe Yin,Aiwei Tang
I–III–VI-group semiconductor nanocrystals (NCs) have received extensive attention for use in quantum-dot light-emitting diodes (QLEDs) due to their nontoxic nature, large-scale tunable emission wavelength and straightforward synthesis. At present, research on ternary CuGaSe2 (CGSe) NCs is gradually being carried out. CGSe-based semiconductor NCs with a wide and tunable bandgap exhibit significant promise for efficient QLEDs preparation. In order to improve their functionality, stability and dispersion, Zn2+ was introduced into CGSe cores, which were coated with wide-band-gap ZnS to form Cu–Ga–Zn–Se/ZnS NCs to improve their luminescence performance. In this work, a series of Cu–Ga–Zn–Se/ZnS NCs with tunable emission from 603 to 524 nm and a photoluminescence quantum yield (PLQY) of 96% could be acquired by precisely controlling the non-stoichiometric Cu : Ga molar ratios in the synthesis of the CGZSe cores. Furthermore, green luminescent CGZSe/ZnS NCs were obtained by adjusting the amount of crucial Zn precursors during nucleation and shell formation. The green QLEDs based on these NCs show a high external quantum efficiency of 5.8% and a high brightness of 7016 cd m−2. This work reveals new possibilities for the design of novel and efficient Cd-free green QLEDs.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Guang-Lan Li,Tian-Ge Ma,Yu-Hui Shi,Fei Deng,Ri-Yang Huang,Yang Yan,Qing Mao,Yushan Li,Yonghou Xiao
Direct ammonia oxidation reaction (AOR) is a promising route for efficiently removing ammonia-nitrogen from wastewater. However, the sluggish kinetics and poor N 2 selectivity present significant challenges for AOR catalysts. Herein, a novel cost-effective hierarchical catalyst was constructed by selenizing NiCuO x nanorods on nickel foam support (NiSe 2 /Se-NiCuO x /NF) via the hydrothermal-calcination selenization method. The selenizing procedure radically manipulates the surface structure of NiSe 2 /Se-NiCuO x /NF, enriching it with oxygen vacancy defects and heterostructures to achieve high efficiency towards AOR. Consequently, the optimal NiSe 2 /Se-NiCuO x /NF only requires 1.50 V to achieve a current density of 65 mA cm - 2 . Furthermore, the N 2 selectivity was up to 98.18% after 5 h of electrolysis. Density functional theory (DFT) calculation elucidates that the defects and heterostructures effectively facilitates electron transfer between NiSe 2 and Cu 2 O, significantly reduces the energy barrier of the rate-determining step (RDS) of O-S mechanism. This work demonstrates the feasibility of metallic selenides as efficient electrocatalysts for AOR.
研究领域:
材料科学
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环境科学
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电催化
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产品关联
DOI
高影响因子
Applied Materials Today
·
2024
·
IF 7.2
Jingyue Wang,Yilei Ding,Jianan Liu,Yian Chen,Yuanfeng Wang,Ansha Zhao
While revascularization is acknowledged as a critical process in wound healing, the scenario becomes more complex when considering diabetic wounds. In such cases, oxidative stress introduces two primary challenges that impede the healing process: ensuring the directional movement of functional cells to the wound site and combating the heightened risk of infection. These challenges underscore the need for innovative therapeutic strategies that can effectively address these restrictions in the context of diabetic wound healing. Hydrogen sulfide (H 2 S) acts as a signaling gas and shows significant therapeutic potential in biomedical research. In this study, we encapsulate Allicin, a natural H 2 S donor, in selenium micelles that specifically respond to oxidative stress. To create the GMA (Allicin@Micelle-GelMA) Composite hydrogel system, we utilize Methacrylic anhydride gelatin (GelMA) hydrogel as a matrix and form it through in-situ light curing. This composite system effectively addresses the problem of healing deep, narrow, and lengthy wounds that pose a challenge, as well as preventing nonspecific sudden release of H 2 S. Additionally, the composite hydrogel system promotes angiogenesis, anti-inflammatory, antibacterial, and antioxidant properties. It also facilitates the directional movement of stem cells and macrophages, as demonstrated through the chicken embryo chorioallantoic membrane vascular test and the establishment of a diabetes wound model that is difficult to heal. Consequently, we conclude that the GMA composite hydrogel has the potential to serve as a versatile skin wound dressing that can effectively respond to oxidative stress.
研究领域:
生物医学工程
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伤口愈合
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材料科学
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药学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
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IF 9.7
Hongxiu Yin,Ying Gao,Xue Zhou,Xiangjun Chen,Zhichao Hu,Lingyu Zhang,Lu Li,Chungang Wang
The oral administration of drugs for cancer therapy can maintain optimal blood concentrations, is biologically safe and simple, and is preferred by many patients. However, the complex lumen environment, mucus layer, and intestinal epithelial cells are biological barriers that hinder the absorption of orally administered drugs. In this study, sea urchin-like manganese-doped copper selenide nanoparticles (Mn-Cu 2−x Se NPs) were designed using an anion exchange method and coated with calcium alginate and chitosan (AC) to form Mn-Cu 2−x Se@AC capsules. The pH-responsive swelling behavior of the AC protective layer aided doxorubicin (DOX)-loaded Mn-Cu 2−x Se NPs in overcoming multiple biological barriers, maintained their stability in gastric acid, and facilitated the release of the NPs in the small intestine. The intestinal epithelial cell permeability of DOX/Mn-Cu 2−x Se NPs was confirmed using a monolayer absorption model involving Caco-2 human epithelial cells. The released DOX/Mn-Cu 2−x Se NPs smoothly passed through the mucus layer, and were absorbed by intestinal epithelial cells. In mice, the NPs circulated in the blood and passively targeted the tumors through blood circulation by enhancing the permeability and retention effect to achieve significant tumor suppression and reduce damage to normal tissues. In addition, the unique sea urchin-like morphology of Mn-Cu 2−x Se NPs enhanced the absorption in the near-infrared-II (NIR-II) window for photothermal therapy, realized the near-infrared-stimulated response release of DOX for increased chemotherapy, and promoted the Fenton-like effect because of the doping of manganese ions for chemodynamic therapy. These effects could permit the development of various synergistic cancer treatments. The use of DOX/Mn-Cu 2−x Se@AC capsules as a multistage oral drug delivery system may overcome the sequential absorption barriers that currently hinder chemotherapy, chemodynamic, and photothermal therapies.
研究领域:
肿瘤学
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药剂学
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纳米医学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 7
·1509
·
IF 3.1
Fan Xie,Zhiyao Ma,Jian Zhou
In addressing the global need for sustainable energy conversion, this study presents a breakthrough in thermoelectric materials research by optimizing the Bi2O2Se1–xTexsystem in the Bi2O2Se/Bi2O2Te pseudobinary series. Leveraging the principles of innovative transport mechanisms and defect engineering, we introduce tellurium (Te) doping into Bi2O2Se to enhance its thermoelectric properties synergistically. With the help of various advanced characterization tools such as XRD, SEM, TEM, XPS, FTIR, TGA, LFA, and DSC, combined with relevant resistance and density measurement techniques, we conducted an in-depth exploration of the complex interactions between various factors within thermoelectric materials. We recognize that the balance and synergy of these factors in the thermoelectric conversion process are crucial to achieving efficient energy conversion. Through systematic research, we are committed to revealing the mechanisms of these interactions and providing a solid scientific foundation for the optimal design and performance enhancement of thermoelectric materials. Finally, the advantage coefficient (ZT) of the thermoelectric material has been significantly improved. The crystallographic analysis confirms the formation of a continuous series of mixed crystals with varying Te concentrations, adhering to Vegard’s law and exhibiting significant improvements in electrical and thermal conductivities. The Bi2O2Se1–xTexcrystals, particularly the Bi2O2Se0.6Te0.4composition, demonstrate a peak ZT of 0.86 at 373 K. This achievement aligns with recent advancements in defect-enabled mechanisms and band convergence and sets a new standard for high-performance thermoelectrics. The study’s findings contribute significantly to the ongoing quest for efficient thermal-to-electrical energy conversion, offering a promising avenue for future sustainable energy technologies.
研究领域:
材料科学
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能源转换技术
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yong Zhang,Rong Liu,Yi Ma,Ning Jian,Huan Ge,Huiyan Pan,Yu Zhang,Chaoqi Zhang,Yongliang Liu,Jie Deng,Luming Li,Jun Zhao,Jing Yu,Andreu Cabot,Junshan Li
In the quest to replace fossil fuels and reduce carbon dioxide emissions, developing energy technologies based on clean catalytic processes is fundamental. However, the cost-effectiveness of these technologies strongly relies on the availability of efficient catalysts made of abundant elements. Herein, this study presents a one-step hydrothermal method to obtain a series of Ni3Se4 nanoparticles with a layer of amorphous selenium on their surface. When employed as electrocatalysts for the methanol oxidation reaction (MOR), the optimized proper surface Se-coated Ni3Se4 nanoparticles exhibit a high current density of 160 mA cm–2 at 1.6 V, achieving a high methanol-to-formate Faradaic efficiency above 97.8% and excellent stability with less than 20% current decay after an 18 h chronoamperometry test. This excellent performance is rationalized using density functional theory calculations, which unveil that the electrochemical recombination of SeOx results in a reduction of the energy barrier for the dehydrogenation of methanol during the MOR process.
研究领域:
材料科学
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能源技术
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催化化学
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产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Zhongyuan Guan,Yang Huang,Zhaojin Wang,Jiayun Sun,Chengwei Shan,Yiguo Xu,Dan Wu,Aiwei Tang,Xiao Wei Sun,Kai Wang
The development of cadmium-free blue quantum dots (QDs) is of paramount importance to the display industry. In this study, high-quality ZnSeTe/ZnSe/ZnS blue QDs, followed by surface treatment with ZnI 2 are initially synthesized. The introduction of ZnI 2 passivated the surface defects, resulting in an increase in the fluorescence quantum yield. The time-resolved photoluminescence (TRPL) demonstrates a significant inhibition of non-radiative recombination associated with the surface defect state. The density functional theory (DFT) calculation reveals that the binding energy between iodine ions and zinc ions is higher than that between oleate ions and zinc ions, providing a theoretical basis for the effective passivation of the suspended bonds of zinc ions on QDs' surface by iodine ions. Moreover, quantum dot light-emitting diodes (QLEDs) are fabricated and UV photoelectron spectra (UPS) indicate the hole injection barrier between the hole transport layer and QDs decreases 0.12 eV after QDs being treated by ZnI 2 , facilitating hole injection. Finally, The ZnI 2 -treated QLED demonstrates a 1.57-fold and 1.82-fold improvement in L max and EQE max , respectively, reaching 6370 cd m −2 and 9.1%, compared to the pristine QLED. The work serves as a valuable reference for enhancing the performance of cadmium-free blue QLED.
研究领域:
材料科学
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纳米技术
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光电子学
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半导体物理
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Deng Long,Hongyu Chen,Weijia Chen,Jingqin Cui,Miao Lu,Xinyi Chen
The adsorption and activation of CO 2 are two essential steps during the photocatalytic reduction of CO 2 . However, CO 2 molecules, being non-polar and linear, are thermodynamically too stable to be activated. In this work, we graft aromatic amine molecules to the surface of two-dimensional MoS x Se y to improve its photocatalytic efficiency. Thus, the photongenerated electrons would swiftly transfer from MoS x Se y to the grafted molecules under the excitation of the visible light, which conducts strong interaction with CO 2 to promote its adsorption. In addition, MoS x Se y with grafted aromatic amine molecules exhibited strong reduction ability to trigger the activation of adsorbed CO 2 , and to facilitate the consequent deoxidization and hydrogenation, significantly improving the final production. The proposed grafting of aromatic amine molecules could be a promising strategy for effectively activating CO 2 photoreduction.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 35
·2401330
·
IF 13
Yingfen Li,Yue Jian,Fang Huang,Nian Zhou,Wanqiu Chai,Juguang Hu,Jun Zhao,Zhenghua Su,Shuo Chen,Guangxing Liang
Cu 2 ZnSn (S,Se) 4 (CZTSSe), a promising absorption material for thin-film solar cells, still falls short of reaching the balance limit efficiency due to the presence of various defects and high defect concentration in the thin film. During the high-temperature selenization process of CZTSSe, the diffusion of various elements and chemical reactions significantly influence defect formation. In this study, a NaOH-Se intermediate layer introduced at the back interface can optimize Cu 2 ZnSnS 4 (CZTS)precursor films and subsequently adjust the Se and alkali metal content to favor grain growth during selenization. Through this back interface engineering, issues such as non-uniform grain arrangement on the surface, voids in bulk regions, and poor contact at the back interface of absorber layers are effectively addressed. This method not only optimizes morphology but also suppresses deep-level defect formation, thereby promoting carrier transport at both interfaces and bulk regions of the absorber layer. Consequently, CZTSSe devices with a NaOH-Se intermediate layer improved fill factor, open-circuit voltage, and efficiency by 13.3%. This work initiates from precursor thin films via back interface engineering to fabricate high-quality absorber layers while advancing the understanding regarding the role played by intermediate layers at the back interface of kesterite solar cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fulin Yang,Wei Qiao,Lice Yu,Shuli Wang,Ligang Feng
Hydrogen generation from methanol via methanol-assisted water splitting is a promising electrochemical energy conversion technology but still meets challenges in addressing the low intrinsic activity and easy poisoning problems of the conventional Pt catalysts. Herein, the support engineering modulated Pt by hierarchical MoSe 2 @mesoporous hollow carbon support was proposed to integrate some structural and catalytic advantages for hydrogen evolution reaction (HER) and methanol oxidation reaction (MOR). Supporting engineering by layered MoSe 2 nanosheets confined in mesoporous hollow carbon spheres (MHCSs) is adopted to uniformly anchor Pt nanoparticles (Pt/MoSe 2 @MHCS), which effectively enhances the conductivity and prevents the layer-by-layer stacking of MoSe 2 ; Strong interaction and coupling ability between Pt and MoSe 2 and the resultant electronic structure regulation of the active centers could weaken the binding strength of CO* and H* intermediates during catalysis and strengthen the oxophilicity leading to improved MOR and HER kinetics. Specifically, Pt/MoSe 2 @MHCS shows a significantly improved MOR current density of 81.1 mA cm −2 , about 3.0 times that of the benchmark Pt/C catalyst. Meanwhile, it also exhibits the HER performance of 28 mV to achieve a kinetic current density of 10 mA cm −2 in methanol-contained electrolytes. When employed for overall methanol electrolysis, a lowered input voltage of 1.11 V can be obtained to drive the current density (10 mA cm −2 ) compared to that for water electrolysis (0.62 V vs. 1.73 V). The electrochemical properties of high activity, rapid catalytic kinetics, and good stability were also demonstrated due to the enhanced oxophilicity and high poisoning tolerance ability resulting from the MoSe 2 /carbon substrate-induced electron redistribution of Pt sites. This work reports a novel platform to address the catalysis challenges in hydrogen production via the methanol electrolysis technique.
研究领域:
材料科学
·
电化学
·
能源转换技术
✓ 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）