Journal of Materials Chemistry A
·
2024
·
IF 10.7
Yi-Zhao Chen,Ting-Ting Mao,Song-Yi Liao,Selina X. Yao,Yong-Gang Min
As novel two-dimensional materials, MBenes derived from bulk ternary metal borides (MAB phase) have attracted increasing attention but are limited by their preparation strategy. In this work, MoxBy (MBene) derivatives with an accordion-like structure were successfully prepared by completely etching an Al layer from MoAlB via a molten-salt method. The thermal behaviors, crystal structure, and surface chemical state were analyzed using DSC/TG, XRD and XPS analyses, respectively. The micro-morphology of the obtained MBene was then characterized using scanning electron microscopy and transmission electron microscopy accompanied by EDS mappings. The results reveal that the MBene synthesized at 620 °C (abbreviated as MBene-620) demonstrates its characteristic (020) peak and layered structure. When used as an advanced anode for Li-ion batteries (LIBs), the MBene delivers excellent electrochemical performances with a reversible specific capacity of 638.2 mA h g−1 after 100 cycles at a current density of 0.1 A g−1. As a promising green strategy, this molten-salt method provides a new opportunity to explore the wide-ranging applications of MBene series, particularly in new energy fields of LIBs.
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
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IF 5.816
Xiaodi Zhang,Guojie Zhang,Xiaowei Qin,Jun Liu,Guoqiang Li,Ying Xu,Yongkang Lv
A series of nitrogen doped biomass carbon catalysts were prepared through two different nitrogen doped methods by using soybean meal as the raw material, melamine as nitrogen source and KOH as the activators. The catalysts were characterized by BET, SEM , CO 2 -TPD, EA , FTIR , XPS and Raman. The catalytic performances of CH 4 –CO 2 reforming over different samples were also studied. The results show that the preparation method of the catalyst significantly affects the structural characteristics, N content and N species type of the catalyst. The characterization results also show the proportion of pyrrolic-N in the catalyst prepared by in-situ nitrogen doped method (Y-NC) is higher than that in prepared by the post-treatment method (H-NC). Pyrrole-N is more conducive to the adsorption and activation of CO 2 . So, the catalyst prepared by in-situ nitrogen doped method has good catalytic activity and stability. The conversion of CH 4 and CO 2 were respectively 40% and 65% at 900 °C after 50 h of CH 4 –CO 2 reforming reaction .
研究领域:
催化
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材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Food Packaging and Shelf Life
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2020
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IF 4.244
Shan Lu,Xia Gao,Chang-Ying Hu,Yining Xia
Low-density polyethylene (LDPE) films containing three types of nanometals (ZnO, Cu, or Ag) were prepared and characterized. A release experiment was carried out on the nanocomposite films subjected to three treatments: no irradiation, gamma irradiation with solvent contact (10 kGy), and gamma irradiation without solvent contact. The release of heavy metals from the nanocomposite films into three types of solvents (water, 95 % ethanol, and 3 % acetic acid) was recorded at room temperature. In general, gamma irradiation was likely to promote the release of heavy metals. The release amount of heavy metals depended on the type of nanometal and solvent. An increase in release amount of Zn and Cu was observed in 95 % ethanol and Ag in all types of solvents at the end of the experiment after the film samples were treated with gamma irradiation (with solvent contact during irradiation). The increase in heavy metal release was attributed to the accelerated surface oxidation of nanometals after irradiation, as confirmed by XPS analysis on the irradiated Ag powders.
研究领域:
材料科学
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纳米技术
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食品安全
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辐射化学
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
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IF 2.781
Yun Yang,Tianjun Zhang,Dan Zhou,Xinchao Liu,Shuijin Yang,Xinhuan Lu,Qinghua Xia
Recently, a Ti-containing hollownest-structured zeolite (Ti-HSZ) material with the shell constructed by randomly intergrown MWW (framework type code) flaky crystals has been synthesized through one-step rotating hydrothermal method within 3.5 days, which shows predominant catalytic property for the epoxidation of alkenes . Herein, it is firstly reported that the crystallization efficiency of Ti-HSZ material can be notably increased by applying seeds-assisted synthesis method. Thus-crystallized materials have been characterized by XRD , UV–vis, XPS , SEM , TEM, FT-IR, and N 2 adsorption-desorption. Moreover, the key controlling factors are revealed to include the addition percentage of seed crystals, rotating rate and filling degree of autoclave. When 2 wt% or 3 wt% seed crystals are added into the reaction gel, the crystallization time of Ti-HSZ can be sharply reduced to 2.5 days or even 2.0 days, respectively. Particularly, thus-synthesized Ti-HSZ-SM material still maintains hollownest morphology characteristic and excellent catalytic activity and catalytic stability. About 95% allyl chloride can be converted into corresponding epoxide when using H 2 O 2 as oxidant, and about 85% cyclopentene and 87% cyclooctene can be converted into corresponding epoxides when using TBHP as oxidant, with the selectivity for epoxides of nearly 100%.
研究领域:
催化
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
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2022
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IF 8.321
Xiaowei Hu,Maowei Luo,Mooeez ur Rehman,Junhao Sun,Hamzah A.S.M. Yaseen,Faisal Irshad,Yujun Zhao,Shengping Wang,Xinbin Ma
The electron-donating effect of supports on active metals has been reported to be beneficial to improve catalytic activity of heterogenized molecule catalysts for CO 2 hydrogenation to formic acid . However, this effect has not been discussed in depth from the perspective of reaction mechanism, especially for CO 2 activation with the combination of theoretical calculations. Herein, we report a catalyst prepared via anchoring RuCl 3 on a post-synthetic modified (PSM) zeolitic imidazolate framework-8 (ZIF-8) in which linkers 3-methyl-1,2,4-triazole (Mtz) with a surplus of uncoordinated N sites have been incorporated. X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations reveal that uncoordinated N sites in linkers donate additional electron-density to Ru, resulting in the decrease of energy barrier of CO 2 activation. And the RuCl 3 @ZIF-8-Mtz(0.29) catalyst containing the most Mtz ligands displayed the highest catalytic performance for the CO 2 hydrogenation to formic acid as compared to RuCl 3 @ZIF-8-Mtz(0.15) and RuCl 3 @ZIF-8.
研究领域:
催化
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材料科学
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化学工程
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理论化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Jian Liu,Yingbi Chen,Yuting Hu,Yiting Zhang,Gengwei Zhang,Shixing Wang,Libo Zhang
A metal-organic framework (ZnO@ZIF-8) with great adsorption potential was developed using ZnO nanoparticles as a surface-active center and applied to lead removal from wastewater. The adsorption experiments were carried out and the related adsorption behaviors were investigated. The adsorbent shows excellent adsorption performance between pH 3–5. The maximum adsorption capacity of ZnO@ZIF-8 for Pb (II) was 689.36 mg/g at 303 K. The adsorptive process of Pb (II) onto ZnO@ZIF-8 conforms to the Langmuir isotherm and pseudo-second-order kinetic models. Thermodynamics illustrate that the adsorption process is chemical adsorption on a uniform surface. Selectivity experiments showed that ZnO@ZIF-8 had the strongest affinity with Pb (II). The adsorption-desorption cycle confirmed that ZnO@ZIF-8 was a reliable and recyclable adsorbent. XPS, Zeta potential and FT-IR analysis illustrate that the adsorption of Pb (II) by ZnO@ZIF-8 was concentrated in electrostatic adsorption and chelation. DFT calculation indicated that there are different types of Pb (II) combination mode (Pb-N and Pb-O) and the adsorption mainly depended on the chelation. This study presented herein played important roles in the governance of heavy metal waste-water pollution as a result of ZnO@ZIF-8 can effective selectivity cleanup of Pb (II).
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2022
·
IF 2.719
Syed Adil Shah,Kuo-Juei Hu,Muhammad Naveed,Cao Lu,Shengyong Hu
Herein, gold-nanoclusters Au 6 (SR) 6 are synthesized in the argon atmosphere, using 2-phenylethanethiol and tetraoctylammonium bromide, as ligands and surfactants, respectively. Au 6 (SR) 6 possesses ca. 1.95 eV HOMO-LUMO gap, which is comparatively high and is also a dominant factor for quantum confinement effect. Moreover, the X-ray Photoelectron Spectroscopy (XPS) study shows the peak of Au 4f 7/2 appears at 86.89 eV, which describes the consistency regarding the size of clusters with XPS peak shift for Au 4f 7/2 value. In addition, the full width half maximum (FWHM) increases accordingly by decreasing the size of clusters.
研究领域:
纳米技术
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材料科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Cunku Wang,Jie Ding,Zhixiong Huang,Yingluo Zhuang,Yan Li,Minxian Shi,Yan Qin
In this work, two ceramizable phenolic adhesives were prepared using ZrSi 2 particles or ZrSi 2 /B 4 C mix particles as the inorganic fillers. The thermal stability, bonding strength , microstructure and phase composition of the adhesives were investigated by TGA , shear strength of Al 2 O 3 joints, SEM, EDS , XRD and XPS . The results show that these two adhesives have different bonding performances and ceramicization evolutions above 600 °C in air due to the addition of the second phase particles B 4 C. The bonding strength of ZrSi 2 /B 4 C modified phenolic adhesive after treatment at 1200 ℃ can be as high as 36.6 MPa, while the bonding strength of ZrSi 2 modified phenolic adhesive under the same conditions is only 17.5 MPa. B 4 C undergoes oxidation reaction before ZrSi 2 , and the oxidation product B 2 O 3 liquid phase not only reacts with ZrSi 2 to form oxidation-resistant ZrB 2 , but also can dissolve the high temperatures defects of the adhesive and chemically bond with the Al 2 O 3 substrates at the interface.
研究领域:
材料科学
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胶粘技术
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热工程
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表面科学
✓ 已验证
产品关联
DOI
高影响因子
WASTE MANAGEMENT
·
2023
·
IF 8.1
Yu Zhang,Meng Yu,Jiangmin Guo,Shaojun Liu,Hao Song,Weihong Wu,Chenghang Zheng,Xiang Gao
The pretreatment of cathode material before leaching is crucial in the spent lithium-ion battery hydro-metallurgical recycling. Here research demonstrates that in-situ reduction pretreatment could dramatically improve the leaching efficiencies for valuable metals from cathodes. Specifically, calcination under 600 °C without oxygen using alkali treated cathode can induce in-situ reduction and collapse of oxygen framework, which is ascribed to the carbon inherently contained in the sample and promote the following efficient leaching without external reductants. The leaching efficiencies of Li, Mn, Co and Ni can remarkably reach 100%, 98.13%, 97.27% and 97.37% respectively. Characterization methods, such as XRD, XPS and SEM-EDS, were employed and revealed that during in-situ reduction, high valence metals such as Ni 3+ , Co 3+ , Mn 4+ can be effectively reduced to lower valence states, conducive to subsequent leaching reactions. Moreover, leaching processes of Ni, Co and Mn fit well with the film diffusion control model, and the reaction barrier is in accordance with the order of Ni, Co and Mn. In comparison, it is observed that Li was leached with higher efficiency regardless of the various pretreatments. Lastly, an integral recovery process has been proposed and economic assessment demonstrates that in-situ reduction pretreatment increases the benefit with a negligible cost increase.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Hailu Fan,Kuo Cao,Jinxiao Ba,Hui Cheng,Xianghai Yu,Aiying Song,Chengqun Xu,Yihua Wang,Donghua Fan
In this work, we reported a facile approach to fabricate molybdenum sulfide (MoS 2 ) electrocatalyst with the introduction of vanadium(V) for improved catalytic performance. The morphology of prepared samples can be characterizated by SEM observation. The XRD and XPS spectra further reveal that the proper amount of vanadium introduction can effectively prompt the increase of crystallinity and formation of edge-terminated structure in MoS 2 nanostructure . The experimental results display that the morphology of MoS 2 can be modulated by various amounts of V incorporation. The conductivity of prepared samples is increased by incorporating a certain amount of graphene. MoS 2 nanostructure with 20% V incorporation shows excellent catalytic performance, and the corresponding mechanism is also discussed. The electrochemical performance of 20%V-MoS 2 can be further improved by the introduction of appropriate graphene. Compared with pure MoS 2 samples, 20%V-MoS 2 /Graphene 7.5 shows a small resistance and excellent cycling stability in the acidic electrolyte, as well as the overpotential at 10 mA decreases from 213 mV to 168 mV.
研究领域:
材料科学
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电化学
·
纳米技术
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 6
·2557-2573
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IF 3.134
Liu Yueyu,Yin Zhili,Wang Ziqing,Mou Ronglin,Wei Zhong
High surface area ZrO 2 –KOH sample was prepared and used the catalyst for the synthesis of glycerol carbonate (GC) from dimethyl carbonate (DMC) and glycerol. The structure properties of ZrO 2 –KOH were characterized by XRD, BET, CO 2 -TPD, XPS, and ICP-OES. It was found that the strong basicity of ZrO 2 –KOH might be attributed to the oxygen vacancies as well as the big surface area. Experiments were developed to evaluate the effects of catalysis loading, proportion of reactants, temperature and reaction time on the conversion of glycerol to GC. The consequences showed that ZrO 2 –KOH was a highly efficient basic catalyst for synthesis of GC from glycerol. The catalytic performance of ZrO 2 –KOH is much better than that of ZrO 2 –KOH–CP, ZrO 2 –NH 4 OH, and some reported heterogeneous catalysts. And the higher performance of ZrO 2 –KOH was ascribed to the strong basicity. 99.43% conversion was obtained in a particular situation of catalyst/glycerol weight ratio of 3 wt%, DMC/glycerol molar ratio of 3:1, reaction temperature of 80 °C, and reaction time of 2 h. The plausible reaction mechanism for the transesterification on the strong basic active sites was discussed.
研究领域:
催化
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化学工程
·
材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qu Ai,Shi-Kuan Sun,Peng-Wei Hao,Yuan-Bin Chen,Yi Zhao,Sheng-Heng Tan,Wei-Chao Bao,Wei-Ming Guo,Hua-Tay Lin,Lewis R. Blackburn
Zirconolite wasteforms were designed for the co-immobilisation of CeO 2 (as a PuO 2 surrogate) and metallic iron, chromium, and aluminum , simulating contaminated FeCrAl alloy cladding. Zirconolite ceramics with the target composition Ca (1-3.87x) Ce 3.87x ZrTi (2-7.73x) Fe 5.73x Cr x Al x O 7 (x = 0–0.11), were synthesised via solid state reaction sintering at 1400 °C. Phase and microstructural evolution were investigated to ensure the oxidation of the metals, formation of zirconolite phase and densification of the final ceramics. It was found that both oxidation and solid-state reaction could be accomplished by processing at 900 °C and 1400 °C under ambient atmosphere, accompanied by the overall yield of zirconolite in the range 92.4–94.0 wt % between x = 0.01–0.07 f.u., with a dense microstructure observed. Polytype transitions from zirconolite-2M to -3T were evidenced, where the solubility limit was reached at substitution level of x = 0.11 and precipitation of CeO 2 was apparent. XPS analysis confirmed that an elevation in dopant concentration resulted in the partial reduction of Ce 4+ to Ce 3+ , whereas Fe, Cr and Al metals were oxidised to the trivalent state. This study demonstrated the feasibility for designing advanced ceramic wasteforms for the co-immobilisation of actinides and metallic cladding residues.
研究领域:
核废物管理
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材料科学
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陶瓷
·
放射性废物固化
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DOI
高影响因子
危险品化学品经营许可证（带存储）