JOURNAL OF NON-CRYSTALLINE SOLIDS
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2024
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IF 3.2
Taiyu Duan,Yao Ji,Weichao Wang,Qinyuan Zhang
The 1.0 μm ultra-short pulse laser is distinguished by its high energy, short pulse width, and intense peak power density, serving various applications in materials processing and biomedicine. Yb ions play a crucial role in this wavelength range, yet achieving high doping levels in commercial Yb-doped silica fibers is challenging due to their dense network structure. Here, we present the design and fabrication of a fluorophosphate (FP) glass with high thermal shock stability (figure of merit is 0.95), achieved through thermodynamic prediction methods, ion field strength analysis, and glass structure theory. By modifying the composition of high-field-strength cations, we not only alter the fundamental properties of the glass but also enhance its thermomechanical performance. Specifically, Yb 3+ -doped Zn(PO 3 ) 2 -Ba(PO 3 ) 2 -AlF 3 -KF FP glass (Yb 10 -ZBAFP10) exhibits a high emission cross-section (0.74×10 −20 cm 2 at ∼1008 nm), a low level of minimum population inversion ( β min =0.09), and minimum pump intensity ( I min =1.75 kW/cm 2 ). Furthermore, it demonstrates a stable fluorescence lifetime within the temperature range of 298 ∼ 473 K. These findings highlight the potential of Yb 3+ -doped FP glass for applications demanding high thermal shock stability, particularly in high repetition rate ultra-short pulse laser systems.
研究领域:
光子学
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材料科学
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激光技术
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玻璃物理
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光学材料
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2026
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IF 9.6
Hao Zheng,Cong Guo,Lin Lin,Hongwei Wang,Jiayue Zhang,Zeyi Jiang,Zhuojian Liang,Zhenghao Chen,Nien-Chu Lai
Efficient and durable bifunctional oxygen electrocatalysts represent a cornerstone for high-energy-density rechargeable metal-air batteries. Herein, we report a facile one-step pyrolysis synthesis of nitrogen-doped graphite carbon-encapsulated Fe/Fe 3 C heterojunction nanoparticles (Fe/Fe 3 C@NC) with a well-defined core-shell architecture. The Fe/Fe 3 C heterojunction exhibits prominent interfacial electron transfer from Fe to Fe 3 C. This electron-rich Fe 3 C phase enables superior adsorption modulation toward oxygen intermediates, thereby endowing the catalyst with exceptional bifunctional oxygen electrocatalytic activity. In alkaline media, Fe/Fe 3 C@NC outperforms platinum-group metal (PGM) benchmarks in both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), achieving a smaller OER/ORR overpotential difference than Pt/C + RuO 2 . When integrated into aqueous and flexible zinc-air batteries, Fe/Fe 3 C@NC maintains an impressive 92.6% of its initial round-trip efficiency (RTE) over 1900 h (5700+ cycles), far exceeding the PGM-based control (23.3% RTE decay within 50 h, 150 cycles). Structural characterizations confirm that Fe/Fe 3 C@NC retains its morphology and crystallinity after prolonged cycling, highlighting the critical role of the core-shell architecture in preserving structural/compositional integrity. This work not only elucidates the pivotal role of the Fe/Fe 3 C heterojunctions in enhancing bifunctional oxygen electrocatalysis but also provides a scalable carbon-encapsulation strategy for designing low-cost, high-performance, and long-lifespan non-noble metal bifunctional catalysts for next-generation metal-air batteries.
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高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 10
·3001-3008
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IF 5
Fanglei Yao,Jiabao Bi,Lei Yu,Liming Dai,Wenkang Xue,Jingyao Deng,Zhihui Yao,Yunyan Wu,Jingwen Sun,Junwu Zhu
Non-noble metal nitrides have emerged as highly efficient and robust substitutes for platinum-based catalysts toward the oxygen reduction reaction. Herein, we demonstrate a supramolecular confinement strategy to synthesize ultrafine iron nitride (Fe3N, less than 1.5 nm) nanocrystals embedded in a nitrogen-doped carbon matrix, in which the pre-formed Fe–N coordination bonds can anchor the Fe3N nanocrystals and prevent their agglomeration during the pyrolysis process. Reducing the size of Fe3N nanocrystals is conducive to exposing more accessible Fe–N–C ORR active sites and consequently facilitating electrocatalytic ORR activity. The optimized Fe3N/NC-800 exhibits a positive half-wave potential of 0.83 V versus RHE, along with favorable stability and superior tolerance toward methanol. The power density and specific capacity of the optimized Zn–air batteries associated with Fe3N/NC-800 are as high as 90.91 mW cm−2 and 691.59 mA h g−1, respectively. Briefly, a feasible supramolecular confinement strategy is proposed for the construction of ultrafine nanocrystals.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Mengting Zhang,Xuejia Huang,Jiejun Li,Yuhong Li,Pengcheng Zhao,Junjie Fei,Yixi Xie
Baicalin (Bn) is the main component of the Chinese patent medicine Baicalin Tablet which is used for the auxiliary treatment of acute, chronic hepatitis and persistent hepatitis. Herein, an ultrasensitive electrochemical sensor was manufactured based on the nitrogen and zinc double doped carbon nanospheres(ZnN-CNS) derived from γ-cyclodextrin self-assembled supermolecules with ZnCl 2 . The sensing nanomaterials were characterized and investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), raman spectroscopy (RS), and scanning electron microscopy (SEM), etc. Under the optimized optimal environment, the linear detection range of the prepared sensor for Bn was ranged from 1 × 10 −8 to 7.5 × 10 −7 M, where the LOD was 7.17 × 10 −8 M with a sensitivity of 220 A/M. Good accuracy and desirable recovery results for the detection of Bn in real samples (Bear bile scutellaria eye drops and Shuanghuanglian oral liquid) were also observed. This work provides a new idea about the detection of Bn as well as the application of novel binary doped carbon materials .
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TETRAHEDRON
·
2023
·
IF 2.1
Yi Liu,Weilu Ding,Yongzhen Li,Ming Li,Ying Liu,Yunong Li,Qian Su,Zifeng Yang
In this work, we designed a novel thermally stable Zn bromide-based deep eutectic ionic liquid (DEIL), synthesized from tetralkylphosphonium bromide (Bu 4 PBr) and ZnBr 2 by a facile heating method. The structural changes and the physical properties of the catalyst were in-depth investigated. Among all the DEILs, ZnBr 2 ·2Bu 4 PBr showed high activity, achieved 98.2% propylene carbonate (PC) yield at a low catalyst usage (0.15 mol%), and remained good stabilities for 8 cycles. Furthermore, based on experimental results and DFT calculations, we found that Bu 4 P + cation of DEIL served as a frame charge-balanced species interacting with three possible anions of ZnBr 4 2− , ZnBr 3 − and Br − . The interaction is accompanied by a reversible pre-equilibrium in which [Bu 4 P] 2 [ZnBr 4 ] could dissociate and produce the true catalytically active species, [Bu 4 P][ZnBr 3 ] and Bu 4 PBr. Meanwhile, a possible ring-opening mechanism was proposed, in which the synergetic effect of cations and anions in the catalytic system can promote ring-opening. The significance of this study is that it provides guidance for developing metal bromide-based DEILs for carbonate synthesis.
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Journal of Cleaner Production
·
2022
·
IF 11.072
Xiaoman Li,Xiaolan Guo,Jiliang Niu,Jialiang Lin,Jianhua Cheng,Yongyou Hu,Yuancai Chen,Weiqiu Wen
The accumulation of antibiotics in the environment has caused worldwide concern and photocatalytic processes have shown attractive prospects for the elimination of antibiotics due to its sustainability, cleanliness and efficiency. In this study, a series of self-assembled hollow tubular Zn–In–S photocatalysts (Zn-doped In 2 S 3 , ZnIn 2 S 4 , and ZnS/ZnIn 2 S 4 ) were first designed by one-step sulfidation of Zn/In-MOFs. The as-synthesized microtubular structured Zn–In–S exhibited high surface area(107.61–127.26 m 2 /g), high porosity(0.25–0.52 cm 3 g −1 ) and high degradation rate(≥86%) towards tetracycline within 120 min. Moreover, the photoelectric properties and photocatalytic performance were dependent on the existence of Zn species. Particularly, the optimized hollow microtubular ZnS/ZnIn 2 S 4 composites exhibited ultrahigh photocatalytic degradation rate (>90%) within 1 h solar light irradiation. The kinetic constant reached 0.0379 min −1 , which was 2.96, 2.02, and 5.65 times higher than In 2 S 3 , ZnIn 2 S 4 , and ZnS respectively. The ultrahigh photocatalytic degradation efficiency originated from the formation of direct Z scheme heterojunction between ZnIn 2 S 4 and ZnS. The unique heterojunction enabled the effective separation of electron-hole pairs and the production of highly reactive oxidants (•OH, •O 2 − , h + ). Density functional theory(DFT) demonstrated a higher charge density near the Fermi level and higher affinity towards O 2 molecules, which contributed to the efficient interfacial charge mobility and O 2 activation. The work provides guidance for the modulation of ternary catalysts to maximize the virtues of photocatalytic activity .
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ACS Applied Nano Materials
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2022
·
IF 6.14
Bao Shi,Lu Chen,Tien-Chien Jen,Xinying Liu,La Li,Aibing Chen,Guozhen Shen
Freestanding and flexible MXene electrodes have exhibited great potential in wearable energy device design through over 10 years of rapid development but are yet limited by the restacking of nanosheets and the complex and lengthy ion transport paths that reduce their performance at high charge–discharge rates. Herein, we provide a molten salt method assisted by a selective etching process for the directional vertical growth of Ti2CTx MXene nanosheets on carbon fiber (CF) substrates, showing several advantages: (1) bifunctional CF, which acts as both a self-supported freestanding flexible substrate and carbon source during the synthesis of the Ti2AlC MAX phase, (2) eliminating the need for collecting the powder Ti2CTx MXene from the acid mixture after the selective etching process and filtration steps to obtain freestanding and flexible MXene films, and (3) the directional vertical arrangement of Ti2CTx shortens the ion diffusion path and the integrated structure of nanosheets and carbon fibers speeds up ion transport. As a result, the fabricated Ti2CTx MXene@CF//Zn@Cu@CF hybrid Zn-ion supercapacitor delivers a high areal capacitance of 380 mF/cm2, an energy density of 52.77 μWh/cm2 at 5 mV/s, excellent stability with 90.06% capacity retention after 10 000 cycles, and 89.76% capacity retention after storing in air for 30 days. The directional vertical Ti2CTx MXene nanosheets can be extended to other application areas, such as sensors, catalysts, detectors, electromagnetic shielding, etc.
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Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-16
·
IF 26.6
Li Xiangyang,Chen Fangshuai,Zhao Bo,Zhang Shaohua,Zheng Xiaoyu,Wang Ying,Jin Xuting,Dai Chunlong,Wang Jiaqi,Xie Jing,Zhang Zhipan,Zhao Yang
An efficient and general strategy for ultrafast synthesis of seven transition metal layered hydroxides on conductive substrates is proposed, which avoids the use of additional reagents, multiple steps and long production time in the traditional bottom-up method.
The whole synthesis process only takes as fast as approximately 13 s, and its synthesis rate reaches ~ 0.46 cm 2 s −1 .
The NiCo LDH@CC as a demonstration example is selected as cathode material for aqueous alkaline Zn (micro-) battery, which exhibits an outstanding performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Tong Qi,Miao Jia,Qiong Yuan,Xu Zhang,Mengqiu Jia
Metal selenides have excellent theoretical capacity when used to store sodium . Compared with single metal selenides, bimetallic selenides stand out with excellent theoretical capacity, sufficient electrochemical reaction sites and good conductivity. In this work, Zn 3 [Fe(CN) 6 ] 2 prussian blue analogue nanospheres are prepared by a static method with PVP as dispersant, and then heterostructure ZnSe/FeSe nanospheres (ZnSe/FeSe NS) composite are prepared by gas-phase selenation. PVP is conducive to the formation of loose and porous structures and alleviate the volume expansion during sodium storage. In this structure, heterostructures can create abundant active sites and increase the electrochemical capacity. Therefore, the ZnSe/FeSe NS show high sodium storage capacity with a reversible capacity of 549.0 mAh g −1 at 100 mA g −1 and 436.8 mAh g −1 even after 100 cycles at 1 A g −1 . It also shows excellent rate performance with high stable capacities of 524.6, 486.1, 447.3, 431.1, 417.9 mAh g −1 in a series of current densities of 100, 200, 500, 1000, 2000 mA g −1 separately. The excellent capacity of the ZnSe/FeSe NS composite comes from the active sites provided by the heterostructure and the high conductivity provided by the built-in electric field.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 11
·4731-4743
·
IF 4.4
Kang Furu,Deng Jun,Pang Qingtao,Yuan Chao,Liu Bo,Yi Xin,Li Hang
Silicone foams (SiFs) are high-performance materials but can combust and release choking smoke in a fire. In this paper, the modified microencapsulated Mg/Zn/Al-layered double hydroxide (MLDHs) was prepared by the sol–gel method. Then, the structure and performance of modified MLDHs were characterized by field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetry (TG), and differential scanning calorimetry (DSC). Besides, the mechanical properties, flame retardancy, smoke suppression, thermal degradation behavior, morphology and composition of carbon slag of SiFs with modified MLDHs were tested using the universal tensile testing machine, limiting oxygen index (LOI), UL-94 test, cone calorimeter, thermogravimetry, SEM–EDS and XPS. The results indicated that the modified MLDHs could effectively improve the ductility of SiFs. When the addition of modified MLDHs exceeded 20 mass%, SiFs could be improved to UL-94-V0 rating. The PHRR, THR, and TSP of SiFs with 30 mass% modified MLDHs were 56.04%, 46.86%, and 80.49% lower than that of pure SiFs. Furthermore, the decomposition products of modified MLDHs/SiFs composite such as SiO 2 and zinc magnesium aluminum oxide could improve the char formation significantly. The continuous, complete, and dense structure of carbon slag of modified MLDHs/SiFs could effectively block the exchange of heat and gas on the surface of SiFs and reduce the combustion performance of SiFs.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
·
IF 6.364
Zexuan Sui,Yan Sun,Yue Jing,Ci Wang,Yao Zhu,Sen Qian,Jing Ren,Jianzhong Zhang
We report the first study on in-situ co-growth of biphasic CsPbBr 3 and Zn-Cd-S quantum dots (QDs) in borosilicate glass , and provide explicitly evidence of their morphology and nanoscale distribution. Such biphasic QDs co-doped nano-glass composites show unique green and red dual-band emissions. By changing the thermal heating scheme, the fluorescence intensity ratio (FIR) and thus the apparent color can be widely adjusted. The FIR can be also fine-tuned simply by varying the excitation wavelength. Based on the FIR, a self-calibrated X-rays dosimeter is constructed, which also possesses a good thermal stability. Although the X-rays induced scintillation weakening occurs, it can be readily recovered by post-thermal-annealing.
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Catalysis Science & Technology
·
2022
·Vol. 13
·期 2
·468-478
·
IF 6.177
Xinyu Lu,Xiaoli Gu
The chemical demand for alkyl phenols (mainly extracted from fossil-derived resources) has been increasingly growing, which has accelerated global energy shortages. Due to the inherent aromaticity of lignin, its effective conversion into alkyl phenols is central to its adoption as a sustainable precursor to produce biochemicals. In this study, catalytic transfer hydrogenation (CTH) of alkali lignin was carried out in a mixed medium (isopropanol/formic acid) at 240 °C for 8 h over a series of bimetallic Ni based catalysts. The acidity and reducibility of the as-prepared catalysts are enhanced via WO3 introduction (to form a WO3–Al2O3 mixed support) and a bimetallic synergistic effect, respectively, leading to improved catalytic activity and selectivity towards alkyl phenols. Different kinds of phenolic compounds (e.g., those with substitutions of methoxyl, alkyl, alkenyl, carbonyl, carboxyl, or hydroxyl groups) were generated over these bimetallic Ni based catalysts with various combinations of Ni + Fe/Zn/Co/Mo/Cu, which was due to their own catalytic promotion of certain reactions (e.g., hydrogenation, deoxygenation, and/or hydrogenolysis). Reaction mechanisms of lignin depolymerization were proposed according to the distribution of phenolic compounds. This work provides a comprehensive investigation on yielding alkyl phenols from lignin CTH over a series of inexpensive bimetallic Ni based catalysts (Ni/(Fe/Zn/Co/Mo/Cu)–WO3/Al2O3), and undertook a catalytic evaluation of the bimetallic synergistic effects on improving the chemical selectivity towards alky phenols, which is beneficial for lignin valorization.
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