FUEL
·
2024
·
IF 6.7
Zhige Zhang,Guican Bi,Shenglong Zhang,Tao Tan,Jun Xie
The use of biogas as renewable raw material to produce syngas（H 2 /CO ≈ 2）suitable for direct synthesis of methanol has attracted wide attention, but designing promising catalysts with high activity and stability remains a challenge. The catalytic systems used for this process usually have the characteristics of poor stability and easy carbon deposition. Here, Based on the Ce redox cycle and the strong metal-support interaction (SMSI), we designed and synthesized a series of Ni catalysts (denoted as Ni/CeMgO x /BN) with BN interfacial constraints. The abundant oxygen vacancy of reaction-induced Ce redox cycle endows Ni/CeMgO x /BN with excellent carbon resistance, because the ability to activate CO 2 /H 2 O is significantly enhanced. The CO 2 /H 2 O activation and carbon elimination mechanism were comprehensively characterized by in situ H 2 -TPR/CO 2 /H 2 O-TPSR, in situ CH 4 -TPSR/CO 2 /H 2 O-TPO, and FTIR, etc. Ascribed to the appropriate basicity of CeMgO x , homogeneous Ni dispersion, and strong interaction between Ni ultra-small nano particles (NPs) and CeMgO x /BN, Ni/CeMgO x /BN exhibit higher CO 2 /H 2 O adsorption/activation, higher CH 4 activation/dissociation, compared with another samples, which facilitate the formation of active oxygen species and intermediate coke removal, thus enhance the resistance to coke deposition and sintering. At 750 °C, Ni/CeMgO x /BN exhibit satisfying catalytic activity (CH 4 /CO 2 conversation 92 %/52 %) and superior stability (100 h) with negligible deactivation rates.
研究领域:
化学工程
·
催化科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jian Meng Jiao,Kai Tang,Jafar Safarian,Bettina Grorud,Kathrine Sellevoll,Merete Tangstad
Si 3 N 4 is a candidate crucible material for Si–B alloys in high temperature thermal energy storage system. In this regard, the phase formation in the Si–B alloys and the interaction between the alloys and Si 3 N 4 were investigated in an induction furnace at 1750 °C with the B addition of 2, 5, 8, and 11 mass %, respectively. Moreover, the wettability property of the Si-3.25B alloy (mass %) on Si 3 N 4 substrate was examined at temperatures up to 1400 °C. The cross-sectional images and micro-analyses showed that BN precipitates were produced in the Si–B alloys and a BN layer was formed at the interface between the Si–B alloys and Si 3 N 4 . However, the amount of BN precipitates was negligible. Next, the equilibrium contact angle of liquid Si-3.25B alloy on Si 3 N 4 substrate was determined to be 134 ± 1°, which indicates non-wetting behavior. The above results support that Si 3 N 4 is a desirable refractory material for the high temperature thermal energy storage system.
研究领域:
材料科学
·
能源工程
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产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Muhammad Waqas,Shamshad Ali,Dongjiang Chen,Bismark Boateng,Yupei Han,Mei Zhang,Jiecai Han,John B. Goodenough,Weidong He
Poly(vinylidene fluoride-hexafluoropropylene)-lanthanum oxide // poly(vinylidene fluoride-hexafluoropropylene)-hexagonal boron nitride (PVH–LaO // PVH-BN) bi-layer separators are developed through a two-step blading approach. La 2 O 3 in the PVH matrix enhances the Li + conduction by providing extra Li + conducting pathways owing to the Lewis acid-base interaction of La atoms with the PVH chains, leading to a high lithium-ion transference number of 0.72 and ionic conductivity of 7.5 × 10 −4 S cm −1 at room temperature. Moreover, the strong interfacial interaction between h -BN and PVH in the bi-layer separator enhances the thermal and mechanical stabilities of the separator. Batteries based on lithium iron phosphate and the bi-layer separator deliver a discharge capacity of 158 mAh g −1 at 0.5 C after 100 cycles and a rate capacity of 81 mAh g −1 at 10 C after 1500 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jilin Wang,Shaofei Li,Wenbiao Li,Yuchun Ji,Dongping Lu,Rifeng Xiao,Fei Long
A simple method was developed for the controllable synthesis of novel BN-coated aluminum borate (Al 18 B 4 O 33 ) heterogeneous core-shell nanowires using Al 4 B 2 O 9 nanowhiskers as rigid templates. This method allows the fabrication of Al 18 B 4 O 33 nanowires with BN coatings of different thicknesses. The phases, microstructures, and chemical compositions of the samples were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and other characterization techniques. The heterogeneous core-shell nanowires of BN/Al 18 B 4 O 33 had diameters and tube lengths of 35–60 nm and 400–600 nm, respectively, and the thickness of the BN cladding shell was between 2 and 7 nm. The concentration of B* volatilized on the whisker surface could be controlled by varying the ammonia flow rate, which in turn regulated the thickness of the BN cladding layer . The thickness of the BN cladding changed more significantly when the ammonia flow rate was varied at the Al 4 B 2 O 9 nanowhisker's decomposition temperature. The experimental results show that the BN on the BN/Al 18 B 4 O 33 heterogeneous core-shell structured nanowires conforms to the vapor–solid (VS) growth mechanism.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yuehan Cao,Ruiyang Zhang,Tianli Zhou,Shengming Jin,Jindi Huang,Liqun Ye,Zeai Huang,Fang Wang,Ying Zhou
Limited by the chemical inertness of CO2 and the high dissociation energy of the C═O bond, photocatalytic CO2 conversion is highly challenging. Herein, we prepare ultrathin oxygen-modified h-BN (O/BN) nanosheets containing B–O bonds. On the O/BN surface, CO2 can be chemically captured and is bonded with the B–O bond, leading to the formation of an O–B–O bond. This new chemical bond acting as an electron-delivery channel strengthens the interaction between CO2 and the surface. Thus, the reactants can continuously obtain electrons from the surface through this channel. Therefore, the majority of gaseous CO2 directly converts into carbon active species that are detected by in situ DRIFTS over O/BN. Moreover, the activated energies of CO2 conversion are significantly reduced with the introduction of the B–O bond evidenced by DFT calculations. As a result, O/BN nanosheets present an enhanced photocatalytic CO2 conversion performance with the H2 and CO generation rates of 3.3 and 12.5 μmol g–1 h–1, respectively. This work could help in realizing the effects of nonmetal chemical bonds in the CO2 photoreduction reaction for designing efficient photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Ruyao Chen,Haiyue Zhang,Yuming Dong,Haifeng Shi
In the metal-based peroxymonosulfate (PMS) activation process, the sluggish surface redox cycle of metal ions generally hampered the efficiency of PMS activation for pollutant removal. Herein, Co-doped CuWO 4 /BN quantum dots (CW/Co/BNQDs) photocatalysts were developed to realize Cu 2+ /Cu + and Co 2+ /Co 3+ dual ions redox cycles for PMS activation, which would facilitate the tetracycline (TC) removal. CW/4Co/2BNQDs could degrade 94.8% TC within 30 min in PMS/Vis system, and the apparent rate constant of CW/4Co/2BNQDs was 2.7 times and 1.2 times higher than those of CW and CW/4Co, respectively. The improved TC degradation performance could be attributed to the synergetic effect between BNQDs and dual redox cycles. X-ray photoelectron spectroscopy (XPS) spectra of samples before and after the reaction demonstrated that BNQDs were beneficial for accelerating the Cu 2+ /Cu + and Co 2+ /Co 3+ redox cycles in CW/4Co/2BNQDs, further boosting the activation of PMS in TC degradation. Experiments of different radical scavengers revealed that the SO 4 ·− /·OH/h + / 1 O 2 reactive species participated in the PMS activation for the TC degradation process. The possible TC degradation pathway and intermediate toxicity were detailed investigated. In addition, CW/4Co/2BNQDs exhibited outstanding photocatalytic activity over five consecutive cycles, which illustrated that it was supposed to be a reliable PMS activator over antibiotic elimination for practical application. And this work shed new light on constructing dual redox cycles for efficient PMS activation.
研究领域:
环境科学
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材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Abdelazeem S. Eltaweil,Ahmed E. Awad,Eman M. Abd El-Monaem,Azza M. Shaker,Gehan M. El-Subruiti
The growing issue of Pb 2+ ions contamination in marine environments necessitates the development of effective adsorbents to significantly mitigate this ecological challenge. In response, a novel composite material comprising layered double hydroxide (LDH), boron nitride (BN), and tin ferrite (SnFe 2 O 4 ) was synthesized for the removal of Pb 2+ ions. The synthesized SnFe 2 O 4 /BN/NiAl-LDH composite was characterized using FTIR, XRD, ZP, SEM, and XPS techniques. Pb 2+ ions removal reached equilibrium within 30 minutes, with a removal efficiency of 95.42%. Pb 2+ removal efficiency increased progressively in the following order based on the data: SnFe 2 O 4 /BN/NiAl-LDH (1:1) > SnFe 2 O 4 /BN/NiAl-LDH (3:1) > SnFe 2 O 4 /BN/NiAl-LDH (1:3). Furthermore, the experimental data were consistent with the Langmuir and Freundlich isotherms, as well as the pseudo-second-order kinetic model, with a maximum adsorption capacity of 434.8 mg/g. Notably, the composite retained over 70% removal efficiency after five cycles, demonstrating its efficient recyclability. In summary, SnFe 2 O 4 /BN/NiAl-LDH exhibits rapid and efficient adsorption, easy separation, and excellent recyclability.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2019
·Vol. 26
·期 12
·1-9
·
IF 1.53
Chen Jiewei,Shang Jingqi,Xue Feng,Wei Qiushi,Xu Ning,Ding Enyong
This article reports on the high-efficiency preparation of few layers h-BN nanosheets (BNNSs) by a high-pressure homogenizer. Then, the BNNSs/chitosan microspheres (BN-CS-M) are finally prepared by mixing BNNSs with chitosan under alkaline conditions. The BNNSs dispersion is investigated by UV-vis spectrophotometer and Transmission Electron Microscopy. In addition, we use Scanning Electron Microscopy and Laser particle size analyzer to characterize the microscopic and macroscopic morphology of BN-CS-M composites. Raman spectroscopy and Specific surface area testing are also used to explore the intrinsic properties of BN-CS-M. Thermal gravimetric analysis shows that composites with high content of BNNSs possess higher thermal stability. The results show that BNNSs is dispersed in the network of chitosan microspheres, and the higher the rate of centrifugation, the fewer BNNSs dispersed in the microspheres. The chitosan microspheres composite with pore diameters in the range of 1.7–2.9 nm belongs to the type IV adsorption curve.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 7
·118118
·
IF 6.2
Yifei Yan,Chuanzhen Huang,Zhenyu Shi,Zhen Wang,Longhua Xu,Shuiquan Huang,Meina Qu,Zhengkai Xu,Dijia Zhang,Baosu Guo,Tianye Jin,Xiaodan Wang,Hanlian Liu,Dun Liu,Peng Yao
The fabrication of porous Si 3 N 4 /BN ceramics for high-temperature radomes via vat photopolymerization is hindered by excessive slurry viscosity, which restricts the recoating process, and by limited curing depth. To overcome these challenges, we developed a high-performance slurry using a synergistic strategy combining BN surface functionalization with optical modulation via SiO 2 . Ultrasonic-assisted hydrolysis and silane coupling significantly enhanced interfacial compatibility with the resin, reducing viscosity from 20.83 to 4.51 Pa·s at a shear rate of 30 s −1 . Simultaneously, the incorporation of refractive-index-matched SiO 2 effectively suppressed light scattering, thereby increasing curing depth and structural integrity. Furthermore, SiO 2 regulated liquid-phase behavior during sintering to optimize the microstructure. The resulting ceramics exhibited an exceptional property balance: 42.14 % porosity, 68.2 MPa flexural strength, a dielectric constant of 2.56, and a loss tangent of 6.85 × 10 −3 . These metrics satisfy the stringent requirements for wave-transparent applications, offering a robust pathway for manufacturing complex-shaped components.
研究领域:
材料科学
·
无机非金属材料
·
陶瓷工程
·
复合材料
·
光电功能材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Yuanjie Xu,Jikang Yao,Hongqiao Lin,Qian Lv,Bo Liu,Lizhi Wu,Li Tan,Yihu Dai,Xupeng Zong,Yu Tang
Enhancing catalyst durability is a critical concern in the partial oxidation of methane (POM) to syngas since the reaction is operated at high temperatures (>600 °C). Alongside sintering and coke deposition, the deactivation of the supported Ni catalyst is often due to the in situ oxidation of active metallic nanoparticles into inactive cations during the POM reaction. Herein, a Ni/BN catalyst was developed by introducing functional CeOx as a promoter to stabilize the Ni sites. The optimized 4Ni/7.5Ce/BN catalyst, comprising 4 wt % Ni and 7.5 wt % Ce on BN, exhibits enhanced stability during continuous testing at 600 °C for 125 h without any deactivation, which is comparable to that of noble metal catalysts. Comprehensive investigations reveal that maintaining the metallic state of Ni under reaction atmosphere is crucial for the stability of the catalyst. The construction of CeOx on BN effectively inhibits migration and oxidation of the catalytically active Ni0 species.
研究领域:
化学工程
·
催化材料科学
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产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2022
·
IF 7.832
Tangyou Sun,Jie Tu,Zhiping Zhou,Rong Sun,Xiaowen Zhang,Haiou Li,Zhimou Xu,Ying Peng,Xingpeng Liu,Peihua Wangyang,Zhongchang Wang
Two-dimensional materials resistive random-access memories (RRAMs) are known to exhibit excellent nonvolatile resistive switching (NVRS) performance. However, most two-dimensional materials are produced as monocrystal films with little attention paid to their stacked, discontinuous, and loose polycrystal states, which may allow for more facile atomic diffusion. Here, we propose a liquid-phase self-assembly (LPSA) method to fabricate stacked hexagonal boron nitride (h-BN) polycrystal film (SHPF) and demonstrate its NVRS behavior. Three device architectures with different electrodes are studied, all of which exhibit resistive switching behaviors. The Al/h-BN/Pt device shows 120 current-voltage (I-V) sweeps without degradation, and the Al/h-BN/ITO device exhibits an on/off ratio of ∼10 4 . The proposed LPSA method can serve as a facile and low-cost way to fabricate memory materials on arbitrary substrates. Moreover, stacked, discontinuous, and loose polycrystal film can facilitate the study of NVRS, which opens up an additional avenue for many potential functional applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Wenjie Xu,Cong Yang,Wenming Su,Nongjun Zhong,Xinnian Xia
Adding functional inorganic two-dimensional nanomaterials is an effective means to improve the long-term anti-corrosion ability of polymer coatings . Here, due to the mussels’ adhesive ability to various substrates, polydopamine (PDA) was used to modify hexagonal boron nitride (h-BN) and a novel PDA-BN@CeO 2 nanohybrid was synthesized through an in situ hydrothermal approach. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS) were employed to characterize the as-prepared nanomaterials. The results of salt spray test and electrochemical measurement showed that the composite coatings exhibited a notable superiority in enhancing the anti-corrosion performance, in which the |Z| 0.01 Hz was nearly three orders of magnitude higher than that of the neat epoxy coatings when soaked for 35 days. The enhancement mechanism can be attributed to the synergistic effect of BN nanosheets extending the corrosion medium diffusion pathway and CeO 2 acting as a corrosion inhibitor to block the contact of corrosion ions with the metal substrate. This study provides a new way for the development of h-BN-based anti-corrosion materials.
研究领域:
材料科学
·
腐蚀与防护
·
纳米技术
✓ 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）