APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Ying Wang,Lina Zhang,Xiaoyan Zhang,Zizhong Zhang,Yuecong Tong,Fuying Li,Jeffrey C.-S. Wu,Xuxu Wang
A novel hollow spherical 3D structure of β-SiC with an open mouth was successfully fabricated by an environmentally friendly approach starting from ethylsilicate interaction with the P123 and glucose. The proposed growth mechanism of SiC hollow spheres was revealed step by step with SEM and XRD. When the as-prepared SiC was applied for the photocatalytic reduction of CO 2 with pure water, it was found to be highly active for the conversion CO 2 into mainly CH 4 hydrocarbon products due to its unique electronic structure, hollow morphology and high BET surface area. Moreover, the photocatalytic activity of the hollow spherical SiC can be greatly improved by loading Pt cocatalyst. The optimal 2.0 wt% Pt loading led to a stable CH 4 evolution as high as 16.8 μmol/g/h (or 376.4 μl/g/h) with the simulated solar light irradiation, which is higher than that of many reported metal oxides (Pt/TiO 2 , CdS/WO 3 , Zn 2 GeO 4 , CeO 2 and g-C 3 N 4 /NaNbO 3 et al.) under similar experimental conditions. This work provides a new strategy for the architecture of thermally and chemically stable non-metallic carbide with unique hollow spherical structure to be a potential nonmetallic photocatalyst for CO 2 reduction into CH 4 .
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高影响因子
ECS Journal of Solid State Science and Technology
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2025
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IF 2.2
zehao Yue,Chong Luo,Chenwei Wang,Jianwei Zhou,Wenbo Liu
As a third-generation semiconductor, silicon carbide (SiC) is extensively utilized in photovoltaic power generation, 5G communication, and new energy vehicles. However, the current method for the chemical mechanical polishing of SiC exhibits low material removal rates (MRRs) and suboptimal surface quality postpolishing. To address these challenges, we developed in this study a slurry that reduced the surface roughness of SiC–Si facets from 3.55 to 0.048 nm, achieving a MRR of 169 nm/h. The core removal mechanism involves a V2O3-catalyzed Fenton-like reaction to convert H2O2 into ·OH radicals for the rapid oxidation of the SiC–Si facets, which produces a softer oxide layer that is subsequently removed by the mechanical action of abrasives. Consequently, ultrasmooth SiC–Si facets with no visible scratches were obtained. On the basis of ultraviolet–visible spectral photoluminescence and X-ray photoelectron spectroscopy analyses, we propose a catalytic oxidation mechanism leading to high-quality surfaces on the SiC–Si facets. In addition, the identification of the active sites of the reaction by means of simulations further validates the polishing mechanism.
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ACS Catalysis
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2025
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IF 13.1
Xiaochao Wang,Xuteng Zhao,Guangzhao Zhou,Ting Chen,Qi Chen,Nicolas Alonso-Vante,Zhen Huang,Yiran Zhang,He Lin
Hydrogen (H2) production from the ammonia (NH3) decomposition reaction (ADR) is promising to build a carbon-free H2 world. However, the temperature usually needs to be above 400 °C to achieve more than 80% NH3 conversion in conventional thermal ADR (TADR), which results in high energy consumption. In this work, an electrically driven, energy-saving gaseous ammonia decomposition reaction (EADR) strategy without external heating on a SiC-mediated Ru/Al2O3 composite catalyst is presented to achieve highly efficient ADR under much milder conditions than TADR. An 85% NH3 conversion was achieved at ca. 230 °C at weight hourly space velocities (WHSVs) of 12,000 mL gcat–1 h–1, close to the equilibrium conversion at the corresponding temperature, and a more than 4-fold reduction in energy consumption was achieved. The efficient EADR can be attributed to the enhanced N–N recombination and hydrogen migration at low temperatures due to the effective current carrier activation effect in the electric field. The energy-saving electrification strategy allows for solving the common dilemma of improving the NH3–H2 conversion efficiency at low temperatures without a complex catalyst design.
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WEAR
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2025
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IF 6.1
Zhijun CHEN,Qiusheng YAN,Jisheng PAN,Hanhao LIU,Kaiyuan LUO,Jingyuan ZHENG
In photocatalytic-assisted magnetorheological polishing(PMRP), both the opacity of the magnetorheological fluid and the non-magnetic properties of the photocatalyst limit the processing efficiency and quality of SiC wafers. In this paper, the magnetorheological fluid is prepared by using photocatalysts with different physical phases(liquid/solid) and properties(magnetic/non-magnetic), and then the friction chemical mechanism is carried out on SiC. The results show that the transmittance of the magnetorheological fluid and the distribution state of the photocatalyst synergistically cooperate to control the chemical oxidation rate of single-crystal SiC. When using magnetic particles with photocatalytic coatings for processing, the photocatalytic reaction spots can be effectively constrained and the SiC oxidation efficiency can be improved.
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CERAMICS INTERNATIONAL
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2024
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IF 5.1
Junzhe Xin,Weidong Wu,Kun Cao,Chenhui Li,Yuefang Peng,Chun Du,Bin Shan
Silicon carbide (SiC) ceramic lattice structures (CLSs) hold significant potential for use in structural components and optical mirrors in space exploration due to their light weight, high strength, and excellent dimensional stability. However, they face challenges such as poor curing performance and weak mechanical strength during the digital light processing (DLP) additive manufacturing process. In this study, SiC@Al 2 O 3 powder was prepared, resulting in a 21 % reduction in absorptivity compared to bare SiC powder. The ceramic paste derived from this powder achieved a curing thickness of up to 80 μm, exhibited a reduced over-curing width, and demonstrated a 75 % improvement in stability compared to bare SiC paste. Consequently, high-quality triply periodic minimal surfaces (TMPS) structured SiC@Al 2 O 3 CLSs green bodies were successfully fabricated. By integrating precursor impregnation pyrolysis with the reaction melting infiltration (PIP-RMI) post-treatment densification method, SiC@Al 2 O 3 /Si CLSs were produced, exhibiting superior mechanical properties with low dimensional shrinkage. At 30 % volume fraction, the specific compressive strength of the primitive-TPMS SiC@Al 2 O 3 /Si CLSs reached 24.79 MPa. This study presents an effective method for fabricating SiC-based CLSs and establishes a foundation for the optimization of SiC ceramic fabrication processes.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Xing Liu,Jing Wang,Yuting Zhang,Gang Guo,Jiakuan Yang,Shushan Yuan,Bart Van der Bruggen
Catalytic ceramic membranes (CCM) have attracted increasing attention in membrane material research due to their catalytic and separation functions. However, it is difficult to obtain stable CCM with excellent catalytic performance via common methods. Herein, SiC ceramic membrane loaded with Co, Cu bimetal were prepared by vacuum filtration method and heat treated at H 2 atmosphere (CoCu@SiC-H CCM). Results confirmed that heat-treated at H 2 atmosphere can enhance the catalytic performance of membrane. The first-order rate constant of the CoCu@SiC-H CCM/ peroxymonosulfate(PMS) system reached 0.01473 ms −1 , which is 10 3 -10 5 times greater than previously researches (0.0409–0.7588 min −1 ). Optimal CoCu@SiC-H CCM/PMS system achieved 98.02 % degradation of sulfamethoxazole in 1 min. The CoCu@SiC-H CCM presents outstanding catalytic performance due to the generation of Co 0 and the increase of oxygen vacancy concentration. OH and SO 4 − play important roles in the CoCu@SiC-H CCM/PMS degradation system. This work provides a new design method for preparing catalytic ceramic membranes with excellent catalytic performance, which can efficiently treat refractory wastewater in harsh environments.
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ADVANCED POWDER TECHNOLOGY
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2024
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IF 4.2
Yang Chen,Zhi Wu,Xiaoming Lou,Jun Ding,Chengji Deng,Chao Yu,Hongxi Zhu,Tao Zhang
In view of the current situation that morphology of SiC whiskers synthesized from rice husk is too single, in this work, the chain-bead SiC whiskers were successfully synthesized via a simple molten-salt method. The effects of heating temperature on the phase composition and morphology of the product were compared under the salt-free and molten-salt conditions. The results indicated that the liquid environment formed by molten salt could retain SiO 2 in the product and promote the formation of cristobalite, inhibiting the formation of SiC. Compared with the SiC synthesized under salt-free condition (linear morphology), the SiC whiskers synthesized by the molten-salt method at 1400 °C showed a chain-bead morphology, which was composed of β-SiC stalks and round beads of amorphous SiO 2 on the stalks. Finally, the formation mechanism of chain-bead SiC whiskers in the molten-salt environment was clarified.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Jinxia Li,Jianjun Chen,Jiyu Tao,Hao Chen
The cotton fiber batt is one of the most commonly used thermal insulator in our lives at room temperature because of its flexible and porous structure . The SiC nanofibers have excellent mechanical, physical, and chemical properties such as high mechanical strength and modulus, low density, high-temperature resistance, which is a promising material for high temperature structural materials or thermal insulator. In this work, a flexible SiC nanofiber batt was fabricated from the cotton fiber batt by sol-gel carbothermal reduction reaction. The fluffy carbonized porous cotton batt was used as a template for the fabrication of sponge-liked SiC nanofiber batt composed of single crystalline β-SiC fibers. It exhibits good compressive flexibility, ultra-high porosity (a specific surface area was 30.90 m²/g), excellent high-temperature stability (ranging from −196 °C in liquid nitrogen to 1300 °C under the flame of butane blowtorch) and low thermal conductivity (0.02 W/(m·K) at room temperature). The SiC nanofiber batt, which has low density, excellent high-temperature resistance and oxidation resistance , is a promising material for high-temperature structural materials or thermal insulators under extreme conditions. The facile fabrication method of SiC nanofiber batt from common cotton batt provides a novel technique for economic industrial production of high temperature thermal insulation material .
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CERAMICS INTERNATIONAL
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2024
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IF 5.1
Tong Che,Xiang-Yu Meng,Tao Yu,Rui-Fen Guo,Ping Shen
This study presents a novel approach for fabricating SiC-reinforced magnesium matrix composites by combining digital light processing (DLP) with pressureless infiltration. Pre-oxidation of SiC powder enhanced its wettability with the magnesium alloy, enabling the near-net-shape fabrication of honeycomb Mg-based composites with precisely controlled SiC and Al 2 O 3 powder ratios. The influence of varying ceramic content on the microstructure and compressive properties of the composites was investigated, revealing significant mechanical anisotropy. A combined approach utilizing fracture morphology analysis and finite element simulations elucidated the compressive behavior and failure mechanisms of the composites under different loading directions. This work not only offers a promising route for on-demand design and fabrication of Mg-based composites but also provides valuable insights into understanding the mechanical behavior of architected composites.
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CERAMICS INTERNATIONAL
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2025
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IF 5.6
Canglong Wang,Zhaocang Meng,Jianke Tian,Yiwen Liu,Yafeng Shu,Haibo Wu,Lei Yang
Given the wide prospects for SiC ceramic with high thermal conductivity, high-throughput screening of SiC containing BeO-Y 2 O 3 -Al 2 O 3 -MgO additives has been implemented by the experimental and multiscale simulation investigation. About 16 groups of SiC prepared by SPS are composed of 4H-SiC, 6H-SiC, 3C-SiC, BeO and yttrium aluminum garnet phases, and exhibit equiaxed and columnar microstructures. It was verified by the density functional theory simulation that these dopants (Be, O, Mg, Al and Y) can migrate spontaneously towards the Σ13 (150) [001] GB. The ceramics with thermal conductivity higher than 120 W/(m·K) were screened out. Especially, the annealed SiC with 5%BeO-10 % additive exhibits the maximum thermal conductivity of 206.5 W/(m·K). The Vickers hardness about 16.89 GPa can be predicted by the macro finite element model simulation, which is accorded with the experimental result. This work provides an economically feasible project for the large-scale production of SiC ceramics with high thermal conductivity.
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CERAMICS INTERNATIONAL
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2024
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IF 5.1
Lei Yu,Kuibao Zhang,Daimeng Chen,Baozhu Luo
TiB 2 -B 4 C composites modified by SiC W with excellent mechanical properties were prepared using hot-press sintering. The effects of SiC W content on the microstructure, densification behavior and mechanical properties were investigated. The dynamic failure behavior was analyzed through the Hopkinson Bar (SHPB) testing. The results demonstrate that the addition of SiC W can effectively refine the microstructure and simultaneously improve the mechanical properties. The TiB 2 -B 4 C composite renforced with 6 wt% SiC W exhibits a nearly full-dense microstructure and excellent mechanical properties. The relative density, flexural strength , Vickers hardness and fracture toughness can reach to 99.95 %, 724 ± 61 MPa, 19.8 ± 0.7 GPa and 6.7 ± 0.3 MPa m 1/2 , respectively. The dynamic failure behavior exhibits that the damage degree increases with elevated loading speed. Moreover, the single-peak and double-peak of the waveform correspond to the two damage degrees of "broken" and "crushed".
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CARBON
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2025
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IF 11.6
Junjie Wang,Cheng Wang,Haitao Yang,Hui Zhang,Dunyan Jiang,Shikuo Li
Design novel interfacial structure material to achieve highly efficient electromagnetic interference (EMI) shielding is one of the biggest challenges. Herein, the asymmetric C/SiC nanofiber film with conductive-dielectric gradient was precisely in situ prepared through the carbon thermal reduction reaction during the Flash Joule Heating (FJH) process. For the Fick diffusion of SiO 2 vapor, the SiC nanoparticles were gradually anchored on the carbon fibers with a gradient distribution from bottom to top. The electrical conductivity of the asymmetric C/SiC nanofiber film was thus continuously increasing from about 7.97 S cm −1 (bottom) to 0.59 S cm −1 (top). As a result, the asymmetric C/SiC nanofiber film achieved a maximum EMI shielding effectiveness (62.0 dB) in the X-band with a thickness of 1.5 mm, and superior stability in various extreme conditions. Moreover, the EMI shielding effectiveness of the asymmetric C/SiC nanofiber film can be adjusted by altering the incident direction or the film thickness. The effects of gradient structure on the potential distribution and electromagnetic wave loss for the asymmetric film were investigated by the Kelvin probe force microscope and finite element simulation analysis. This work provides a novel insight into designing reasonable interfacial structure to modulate EMI shielding performance.
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