FUEL
·
2020
·
IF 5.578
Chenyao Bi,Xu Wang,Qing You,Baoyu Liu,Zhuo Li,Jianbo Zhang,Qingqing Hao,Ming Sun,Huiyong Chen,Xiaoxun Ma
Five MFI-type zeolite catalysts, which were aluminosilicate ZSM-5 (Z5), gallium-substituted silicalite-1 (Ga-S1), mesoporous ZSM-5 (MZ5), gallium-substituted mesoporous silicalite-1 (Ga-MS1) and gallium-substituted mesoporous ZSM-5 (Ga-MZ5), were hydrothermally synthesized with combined using of TPAOH and TPOAC as micropore and mesopore structure-directing agents respectively, followed by the application in the catalytic upgrading of volatiles from low-rank coal fast pyrolysis. The obtained results indicated that significant improvements with the yield of high value-added products of BTEXN (benzene, toluene, ethylbenzene, xylene and naphthalene) increased from 5.4 mg.g −1 to 11.9–26.4 mg.g −1 , as well as the content of light fractions (<300 °C) in coal tars increased from 51% to 65–88% were realized by using the representative MFI-type zeolite catalysts in contrast to non-catalyst pyrolysis. Moreover, the possible mechanism for catalytic upgrading over the best-performing catalyst of gallium-substituted mesoporous ZSM-5 (Ga-MZ5) with the highest yield of aromatics and effective reduction of phenols was proposed on the basis of systematic comparison of structural features and catalytic performances of various MFI-type zeolite catalysts and fundamental study of the synergetic effects dominated by acidity, ratio of Brønsted/Lewis acid sites, intra-/extra-framework gallium species and hierarchical meso-/microporosity.
研究领域:
能源化学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2012
·
IF 4.805
Le Xin Song,Yue Teng,Jie Chen
The first part of the study is devoted to the comparison between the doping effect of urea (a small molecule) and polyethylene glycol (PEG, a long-chain polymer) on the physical property of metallic gallium (Ga). The physical properties of the Ga composited in the two materials, Ga/urea and Ga/PEG, were investigated by scanning electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, differential scanning calorimetry, superconducting quantum interference device, and surface-enhanced Raman scattering spectra and compared with our previous results for the effect of macrocyclic hosts (e.g., cyclodextrins, calixarenes) on the physical modification of metallic Ga. Our data provide new direct evidence that the modification of physical properties of Ga is highly dependent on the nature of dopants used. For example, the addition of a small amount of urea causes a fundamental change in the crystallization behavior of Ga, and the presence of PEG results in the occurrence of a weak paramagnetism of Ga at high fields, both of which are completely different from the effect of other dopants. The other part of the study is devoted to demonstrating whether there is a significant difference in the oxidation process of metallic Ga and its composites. Our result gives a strong positive answer to the question. β- and γ-gallium oxide nanocrystals were obtained by sintering the Ga/urea composite at different temperatures and exhibited distinctive photoluminescence and photocatalysis properties. These results gave a strong impression that the introduction of different dopants leads metallic Ga to generate different features in microstructure, physical property, and especially chemical reactivity. We believe that the findings of this study have important implications for the development of inorganic materials.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhi-Han Zuo,Ying-Ying Peng,Junhao Li,Xiaojun Wang,Zhao-Qing Liu,Yibo Chen
Color-tunable persistent luminescent materials that respond to external physical stimuli are fascinating but rarely reported, especially the dynamic ones. In this work, a dynamically color-tunable persistent luminescence by varying the ambient temperature is revealed in an all-inorganic singly-phase Cr 3+ , Mn 2+ co-doped zinc gallate spinel phosphor. The persistent luminescence shows dramatic color variation from green (∼503 nm) to deep red (∼709 nm) in 350 ∼ 650 K. The application potential of this phosphor for advanced anti-counterfeiting is verified by fabricating several multi-level anti-counterfeiting models, which work under both fluorescence and afterglow modes. Further, by detailed optical investigations and theoretical calculations, two factors are demonstrated to endow the persistent luminescence of the co-doped phosphor with temperature-dependent afterglow colors: the dual-traps electronic structure of the host and the different photoluminescence thermal quenching properties of the Cr 3+ /Mn 2+ emitters. This work reports the dynamic color-tunable persistent luminescence under different temperatures in Cr 3+ , Mn 2+ co-doped zinc gallate and provides a new perspective for the design of thermal-responsive dynamic optical materials for the application of advanced anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ying Zhang,Zhen Xin Hui,Hong Yu Zhou,Shi Feng Zai,Zi Wen,Jian Chen Li,Chun Cheng Yang,Qing Jiang
Design and fabrication of high-efficiency electrocatalysts for hydrogen evolution reaction (HER) in alkaline conditions are crucial to reduce energy losses in water-alkali and chlorine-alkali industry yet challenging. Herein, density functional theory simulations indicate that the Ga dopant could systematically enhance the HER activity of CoP by improving the H 2 O adsorption, weakening OH adsorption, and optimizing the H adsorption/desorption. Aided by these findings, we successfully prepared ultrathin Ga-doped CoP nanosheets (Ga-CoP NSs) self-supported electrode via electrodeposition followed by the phosphorization treatment for the first time. Ga-CoP NSs delivers superior HER electrocatalytic activities with a very low overpotential of 44 mV to drive a current density of 10 mA cm −2 , outperforming almost all non-noble metal based HER electrocatalysts in alkaline media.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 27
·17217-17227
·
IF 4.036
Yuchen Yao,Yuntao Cui,Zhongshan Deng
Phase change materials (PCMs) have attracted more and more attention in the field of energy and thermal management due to the characteristic of exchanging heat with small temperature change. In order to obtain perfect PCMs, previous researchers usually prepared various phase change composites (PCCs), but there is still a gap toward the goal. Perhaps the development of PCMs with adjustable properties in a wide range to meet different needs is a feasible option. Given that the properties of organic PCMs and metal PCMs are highly complementary, using expanded graphite (EG) as a mediator, a stable PCC of octadecane and gallium that are difficult to directly mix, was successfully prepared. Octadecane and gallium are stored in the microstructures of EG, and the microstructures of EG play the role of storing nucleation embryos, and the suppression of supercooling can reach more than 86.82%. The test results showed that the properties of the PCC are indeed a balance between octadecane and gallium, and can be adjusted in a wide range. The PCC also has good structural and chemical stability, which can effectively avoid the corrosion risk caused by gallium leakage. The PCC samples containing equal amounts of gallium and paraffin were selected for thermal management performance tests. The results indicated that the PCC has application potential in related fields, and can provide a reference for the development of other PCCs.
研究领域:
材料科学
·
能源工程
·
热管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 18
·3238
·
IF 5.719
Long Xu,Yuehan Cao,Tianwei Song,Caixia Xu
In this work, low-threshold resonant lasing emission was investigated in undoped and Mg-doped GaN thin films on interfacial designed sapphire substrates. The scattering cross-section of the periodic resonant structure was evaluated by using the finite difference time domain (FDTD) method and was found to be beneficial for reducing the threshold and enhancing the resonant lasing emission within the periodic structures. Compared with undoped and Si-doped GaN thin films, p-type Mg-doped GaN thin films demonstrated a better lasing emission performance. The lasing energy level system and defect densities played vital roles in the lasing emission. This work is beneficial to the realization of multifunctional applications in optoelectronic devices.Keywords:gallium nitride;lasing action;resonant structure;patterned sapphire substrate
研究领域:
光学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 28
·1-11
·
IF 2.8
Xia Junjia,Ma Xing-Hua,Zhang Zhenlu,Nahm Sahn,Zhang Shuling,Ma Xingyi,Guo Feng
In this work, ZnGa 2– x O 4–1.5 x (0.0 ≤ x ≤ 0.15) ceramics were synthesized by a solid-state reaction method. ZnGa 2 O 4 ceramic that is sintered at 1300 °C/3 h exhibits good microwave dielectric properties with ε r of 11.06, Q × f of 74,730 GHz, and τ f of − 69.7 ppm/°C. However, it cannot be fully densified at temperatures lower than 960 °C, even when a large amount of B 2 O 3 is added, which seriously inhibits its application in the LTCC (low temperature cofired ceramic) field. Therefore, adding B 2 O 3 to Ga 2 O 3 -deficient ZnGa 2 O 4 ceramics is proposed to decrease the sintering temperature to below 960 °C. Owing to the dual effect of the B 2 O 3 -rich and ZnO-B 2 O 3 related liquid phases, ceramics with added B 2 O 3 (≥ 20 mol%) were found to sinter well at 950 °C, and good microwave dielectric properties were also achieved. In particular, 25 mol% B 2 O 3 added to ZnGa 1.95 O 3.925 ceramic sintered at 950 °C showed promising microwave dielectric properties for 5 G/6 G technologies without reaction with a silver electrode: ε r = 9.19, Q × f = 37,337 GHz, and τ f = − 58.3 ppm/°C.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zuowei Liu,Qinghua Tian,Xueyi Guo,Yasong Huang,Zhipeng Xu
Traditional gallium electrowinning suffers from low current efficiency and high specific energy consumption due to the inevitable hydrogen evolution reaction. In order to inhibit hydrogen evolution reaction and alleviate the concentration polarization, the pulse cyclone electrowinning process was proposed and developed to enhance diffusion and convection. During the pulse current off time, the ion concentration in the cathode diffusion layer can be effectively restored, while forced convection accelerates this process. Electrochemical experiments using a rotating disk electrode have preliminarily confirmed that pulsed electrodeposition can accelerate nucleation and improve current efficiency. Pilot experiments were conducted using an industrial gallium electrolyte to further validate the feasibility of the pulse cyclone electrowinning process. Under the following conditions: current density of 2000 A/m 2 , duty ratio of 50%, frequency of 10 Hz, and circulation flow of 400 L/h, the current efficiency and specific energy consumption were determined to be 69.21% and 7836 kWh/t, respectively. Compared to the traditional electrowinning process at the same average current density, pulse cyclone electrowinning exhibited a significant increase in current efficiency and a reduction in specific energy consumption by 52.28% and 31.57%, respectively. Overall, this study confirmed the feasibility of pulse cyclone electrowinning coupling pulse current and forced convection, which can also be applied to other electrodeposition processes to achieve higher current efficiency and lower energy consumption.
研究领域:
冶金工程
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 20
·期 2
·2305283
·
IF 13.3
Rong Li,Yujia Zeng,Lei Song,Junlin Lv,Chao Wang,Changan Zhou,Shangchen Cai,Ting Chen,Shuwen Yue,Kui Ma,Hairong Yue
Increasing the sulfur cathode load is an important method for promoting the commercialization of lithium–sulfur batteries. However, there is a common problem of overcharging in high-loading experiments, which is rarely reported. In this work, it is believed that an insulating layer of S 8 forms on the current collector surface, hindering electron exchange with polysulfides. Continuous external current input during layer formation can cause irreversible electrode changes and overcharging. The general solution is to provide nucleation centers with adsorption sites to promote the 3D growth of the insulated S 8 , thus avoiding overcharging. In this work, a solution is proposed by providing nucleation centers by gallium nitrate, by regulating the 3D growth of S 8 away from the surface of the current collector to avoid overcharging and by improving battery performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Ruizhe Xing,Guoxuan Xu,Ning Qu,Rui Zhou,Jiayi Yang,Jie Kong
This work reports a gallium indium alloy (EGaIn)-doped SiBOC ceramic that possesses a unique liquid-metal-in-ceramic feature. The low-viscosity liquid nature of gallium-based liquid metals (Ga-LMs) and the reactive core-shell structure provide possibilities for phase engineering inside polymer-derived ceramics. As a demonstration, EGaIn nanoparticles (NPs) are directly mixed with a UV-curable ceramic precursor (UV-PBS) to obtain a resin suitable for digital light processing 3D-printing. After pyrolysis at 800–1200 °C, SiBOC ceramics with uniformly distributed EGaIn NP domains (Si(GaIn)BOC) are obtained. EGaIn plays a key role in promoting carbonization and preventing crack formation during the polymer-to-ceramic process, resulting in an increase in both ceramic yield and mechanical strength. EGaIn NPs are also found to have a core-shell structure (EGaIn@(GaxIn1- x )2O3@SiBOC) inside the SiBOC matrix, which significantly enhances the dielectric properties and improves the interfacial polarization. As a result, an excellent electromagnetic wave absorption performance is achieved across the C, X, and Ku bands, respectively. Through rational design, a novel metastructure design based on the Schwarz P minimal surface is proposed, which exhibits an ultrawide effective absorption band extending up to 11.36 GHz (within C-Ku bands).
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Qi Zou,Qichi Le,Xingrui Chen,Yonghui Jia,Chunyan Ban,Tong Wang,Henan Wang,Ruizhen Guo,Liang Ren,Andrej Atrens
This paper investigates the microstructure, corrosion, electrochemical behavior, and the discharge performance of Gallium (Ga) alloyed Mg-Al-Zn alloys using the gravimetric method, electrochemical measurements, and battery test. The average grain size of AZ80–2.5Ga (Mg-8Al-0.5Zn-2.5Ga alloy) is 36% smaller than that of AZ80 (Mg-8Al-0.5 Zn alloy). The number and size of the Mg 17 Al 12 phase particles are smaller and more homogeneously distributed. Ga reduces the self-corrosion rate, increases the electrochemical activity and the discharge performance. The grain refinement generates many grain boundaries on the surface and promotes discharge performance. The decrease of the self-corrosion rate is attributed to the suppression of the protective film that inhibits the anode consumption. The AZ80–2.5Ga anode has the optimal discharge capacity of 1437 mAh g − 1 and anode efficiency of 61% at 50 mA cm −2 , which are 25% and 29% higher than for the AZ80 anode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
BIOMACROMOLECULES
·
2017
·
IF 5.246
Haijiao Zheng,Tenggao Zhu,Xiqian Li,Guan Wang,Qiong Jia
Biological-material-functionalized porous monoliths were prepared with lactoferrin and β-cyclodextrin via a click reaction. With the monolith as an extraction medium, a method combined with ICP-MS was developed for the determination of total gallium originating from metabolic residues of orally bioavailable gallium complexes with tris(8-quinolinolato)gallium (GaQ3) as a representative. The method exhibited favorable adsorption behaviors for gallium with high selectivity, low detection limit (2 ng L–1), and an enrichment factor of 29-fold with the sample throughput of 30 min–1. The developed approach was validated by the analysis of gallium from GaQ3 metabolic residues in a human cell line. Additionally, the practical applicability of this method was evaluated by the determination of gallium in human blood and urine samples from cancer patients. Results illustrated that the prepared monolith had potential in Ga-based anticancer drug analysis in complex biological samples.
研究领域:
分析化学
·
生物医学工程
·
药理学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）