JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Lei Li,Zhi-Feng Jiao,Ji-Xiao Zhao,Dan Yao,Xiang Li,Xiang-Yun Guo
The selective hydrogenation of cinnamaldehyde (CAL) is very important, but still remains challenging due to the coexistence of easily hydrogenated C C and C O bonds in CAL molecule. In this work, we report that employing partially oxidized SiC (SiC–O) as the support of Pt can evidently enhance the catalytic selectivity for the selective hydrogenation of C O in CAL. Further investigations show that the partially oxidized SiC surface can change the adsorption mode of CAL and facilitate the selective adsorption of C O in CAL. During the catalytic process, H 2 was dissociated on Pt particles while CAL was mainly adsorbed and activated on the surface of support. The active H species generated on the Pt surface then spilled over to the support surface and reacted with the C O bond activated by the support surface to selectively form cinnamylalcohol. The present work revealed an important cooperative catalysis of metal and SiC, which would be helpful to design and application of more SiC-based catalysts.
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DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Linyi Wu,Yipei Li,Binghua Zhou,Jian Liu,Deliang Cheng,Shien Guo,Keng Xu,Cailei Yuan,Mingxi Wang,Gan Jet Hong Melvin,Josue Ortiz-Medina,Sajjad Ali,Teng Yang,Yoong Ahm Kim,Zhipeng Wang
Coupling graphene-based materials with SiC nanostructures is one of the most feasible strategies to improve the photocatalytic CO 2 reduction performance. Here, we synthesized the vertical graphene (VG) sheets on the SiC nanowires achieved from rice husks to form the VG@SiC/C composite, in which the VG sheets possess high surface area, excellent electrical conductivity , and chemical stability, and the SiC nanowires have a suitable bandgap for sunlight absorption. The resulting VG@SiC/C composite provides an enhanced photocatalytic reduction of CO 2 to CO and CH 4 , yielding CO and CH 4 evolution yields of 25.5 and 2.3 μmol g −1 h −1 , respectively. The achieved CO yield is maximal so far among the SiC-based photocatalysts . The defective VG sheets promote the absorption of sunlight, enhance the CO 2 adsorption and activation, increase the separation of photogenerated electron-hole pairs, improve the activity of photocatalyst, and thereby prompt the photocatalytic reduction of CO 2 to CO with high yield and selectivity.
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高影响因子
International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 3
·1636-1645
·
IF 2.328
Yehong Cheng,Fan Zhang,Denghao Ma,Yixin Zhang,Yaxiong Liu,Yumin An,Anzhe Wang,Ning Hu,Libin Zhao,Wenbo Han
Although C f /ZrB 2 –SiC composites prepared via direct ink writing combined with low-temperature hot-pressing were shown to exhibit high relative density, high preparation efficiency, and excellent flexural strength and fracture toughness in our previous work, their oxidation and ablation resistance at high and ultrahigh temperatures had not been investigated. In this work, the oxidation and ablation resistance of C f /ZrB 2 –SiC composites were evaluated via static oxidation at high temperature (1500°C) and oxyacetylene ablation at ultrahigh temperatures (2080 and 2270°C), respectively. The thickness of the oxide layer of the C f /ZrB 2 –SiC composites is <40 μm after oxidizing at 1500°C for 1 h. The C f /ZrB 2 –SiC composites exhibit non-ablative properties after oxyacetylene ablation at 2080 and 2270°C for >600 s, with mass ablation rates of 3.77 × 10 −3 and 5.53 × 10 −3 mg/(cm 2 s), and linear ablation rates of −4.5 × 10 −4 and −5.8 × 10 −4 mm/s, respectively. Upon an increase in the ablation temperature from 2080 to 2270°C, the thickness of the total oxide layer increases from 360 to 570 μm, and the carbon fibers remain intact in the unaffected region. Moreover, the oxidation and ablation process of C f /ZrB 2 –SiC at various temperatures was analyzed and discussed.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yuehua Lin,Jinghang Liu,Shaolei Song,Jingbo Liu,Sajid Bashir,Yun Guo,Qiang Zhen
The microstructure evolution of rod-shaped ZrB 2 in situ synthesis of ZrB 2 -SiC composite powder was studied under different heat treatment. TG-DSC, XRD , SEM, EDS, TEM, and HRTEM were used to describe the preparation, phase composition and morphology of rod-shaped ZrB 2 . As a result, tiny ZrB 2 rod grew out of the liquid phase and adopts a layered growth process. As the rod grew in the longitudinal and transverse directions, the surrounding liquid phase was consumed, and the adjacent rods began to grow in parallel or cross grow to form multiple structures.
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2019
·Vol. 21
·期 9
·1900458
·
IF 2.906
Qingliang Shan,Qinglei Wang,Yudong Xue,Jianbao Hu,Jinshan Yang,Haijun Zhou,Guangxiang Zhu,Shaoming Dong
Aluminum oxide is introduced into SiC f /(SiC + B 4 C) composites to improve the surface cracking resistance after oxidizing at 1100 °C in O 2 /H 2 O (40/60) atmosphere. Research on morphology observation of oxidized composites reveals that Al 2 O 3 can lead to the formation of a dense and smooth oxidation layer, resulting in a relatively shallow oxygen penetration depth. In-depth studies on acoustic emission reveal that composites with Al 2 O 3 can improve the surface cracking resistance after oxidizing at 1100 °C in O 2 /H 2 O (40/60) atmosphere since the retention rates of σ min (first acoustic emission [AE] stress) and σ onset (AE onset stress) are significantly increased compared with virgin composites. Moreover, a small number of cumulative events and steep slope of strength–time curves at the initial stage further confirm the improvement of surface cracking resistance after oxidation.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Shi-Pan Yin,Zhao-Hui Zhang,Xing-Wang Cheng,Tie-Jian Su,Zheng-Yang Hu,Qi Song,Hao Wang
Almost fully dense B 4 C-TiB 2 -SiC composite ceramics with high flexure strength and good fracture toughness were fabricated through in-situ reaction between B 4 C, Ti 3 SiC 2 and Si using spark plasma sintering method at a relatively low temperature of 1650 °C. The intergranular and intragranular structure containing nanoparticles with different phase were introduced into the composite ceramic. The nano and micro particles in the microstructure formed a multi-scale particles reinforced structure. The refined matrix grains and the multi-scale reinforcing particles had a synergetic effect on improving the mechanical properties of the composite ceramics. As a result, B 4 C-TiB 2 -SiC composite ceramic with 30 wt% (TiB 2 + SiC) exhibits low density and optimum mechanical properties with high flexural strength of 531.2 MPa, good fracture toughness of 5.77 MPa m 1/2 and moderate micro-hardness of 28.6 GPa.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2016
·
IF 2.933
Wenyi Shi,Borui Liu,Xiangyun Deng,Jianbao Li,Yixiao Yang
Cordierite-bonded porous SiC membrane supports with diatomite as silicon source were prepared in air at 1150–1400 °C via reaction bonding technique. The phase composition, microstructure, flexural strength , open porosity, pore size distribution as well as dielectric properties of membrane supports were investigated as a function of the mass ratio of different starting materials, sintering temperature , graphite content and holding time. It was found that the diatomite addition strongly promoted the phase transformation towards cordierite, meanwhile, due to the enhancement of necks at the contacting pionts growth by the additions of diatomite (5.17 wt%), a high three-point flexural strength of 49.19 MPa was achieved at an open porosity of 37.72% sintered at 1250 °C for 3 h. Meanwhile, the cordierite structure can incorporate of diatomite (like Fe 2 O 3 ) by solid solution formation, which can highly enhance on the electrical properties of cordierite-bonded SiC porous ceramics .
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Jianjun Su,Biao Gao,Zhendong Chen,Jijiang Fu,Weili An,Xiang Peng,Xuming Zhang,Lei Wang,Kaifu Huo,Paul K Chu
Silicon carbide (SiC) nanomaterials have many applications in semiconductor, refractories, functional ceramics, and composite reinforcement due to their unique chemical and physical properties. However, large-scale and cost-effective synthesis of SiC nanomaterials at a low temperature is still challenging. Herein, a low-temperature and scalable process to produce β-phase SiC nanoparticles from rice husks (RHs) by magnesiothermic reduction (MR) at a relative low temperature of 600 °C is described. The SiC nanoparticles could inherit the morphology of biogenetic nano-SiO2 in RHs with a size of about 20–30 nm. The MR reaction mechanism and role of intermediate species are investigated. The result shows that SiO2 is first reduced to Mg2Si in the rapid exothermic process and the intermediate product, Mg2Si, further reacts with residual SiO2 and C to produce SiC. Moreover, the SiC shows considerable electromagnetic wave absorption with a minimum reflection loss of −5.88 dB and reflection loss bandwidth < −5 dB of 1.78 GHz. This paper provides a large-scale, cost-effective, environmental friendly, and sustainable process to produce high-quality β-phase SiC nanoparticles from biomass at a low temperature, which is applicable to functional ceramics and optoelectronics.
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高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2017
·
IF 3.094
Shuang Yi,Shubin Wang,Huiyu Yang
To improve the strong interface between fibers and ceramic matrix in silicon carbide (SiC) fibers reinforced in ceramic matrix composites (CMCs), tremendous efforts have been devoted to the fabrication of fiber coating. However, the design and preparation of these fiber coatings still remain a considerable challenge. In this study, we report a novel strategy to synthesize foldcore sandwich structure formed by boron nitride (BN)-coated graphene nanosheets (GNS) grafted to SiC fibers and analyze how the presence of GNS/BN composite coatings influences the mechanical performance of the fibers. In the fracture process, GNS-grafted SiC fibers coated with BN provide a specific wrinkled and malleable surface, which can be flattened and then broken in the early fracture stage. As a result, the fracture process is changed, resulting in enhanced mechanical performance. Our strategy could be further extended to the fabrication of other composite coatings on fibers with enhanced mechanical properties .
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Huijuan Qiu,Hongkang Wei,Shifeng Ren,Lingjun Sun,Jia Li,Zihan Wang,Haozhan Li,Lin Zhao,Jun Luo,Chang-an Wang
In this work, in situ formed TiB 2 -reinforced SiC ceramic composites were prepared by reactive hot pressing using SiC, TiC, B 4 C, and Si as raw materials. Phase composition, microstructure, and mechanical as well as electrical properties were investigated. The formation of the TiB 2 phase could be realized from the reaction among TiC, B 4 C, and Si. In the sintered SiC–TiB 2 ceramic composites, the content of α-SiC decreased while that of the in situ formed TiB 2 increased. In addition, residual Si only existed in the SiC–TiB 2 ceramic composites with in situ TiB 2 below 20 mol%. Notably, the comprehensive performance of the SiC–TiB 2 ceramic composites was enhanced with the increase of TiB 2 content due to the reduction of pores and residual Si. Finally, nearly fully dense SiC–TiB 2 ceramic composites were obtained when in situ formed TiB 2 was above 20 mol%. The SiC–TiB 2 ceramic composites, with in situ TiB 2 of 30 mol%, exhibited hardness of 26.9 ± 2.3 GPa, fracture toughness of 6.83 ± 0.6 MPa m 1/2 , and electrical resistivity of 0.3 mΩ cm, respectively.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qingyuan Cao,Hanqi Qian,Tao Liu,Nan Li,Yudong Huang,Dawei Jiang,Bo Jiang
Polymer-derived ceramics (PDCs) endowed with outstanding mechanical properties, chemical and thermal resistance are highly demanded for applications in extreme environments, whereas their practical applications have constantly been constrained by structural collapse and the brittle nature of ceramics at high temperatures. A novel methodology was proposed to boost the growth efficiency of SiC nanowires by one-step pyrolysis prepared heterostructure promoter in situ during the process of PDCs. The quantity and dispersibility of heterogeneous promoter have been markedly enhanced through one-step pyrolysis. Furthermore, the heterostructure promoter prepared via ligand exchange between ferrocene and Zr atoms exhibited nano-flower structure and greater specific surface area, thereby possessing higher adsorption capacity for reaction intermediates by providing more reaction sites. This was accountable for the enhancement of growth efficiency of nanowires and gave rise to the formation of a crack-free ceramics phase with higher strength, lower brittleness and multifunctionality. The yield of ceramics attained 87.84% under the impact of the heterogeneous promoter. In contrast to other promoter, heterogeneous promoter was capable of promoting a greater number of SiC nanowires with higher aspect ratios and more homogeneous distribution. Furthermore, SiC nanowires featuring core-shell structure were grown in hybrid resin by heterostructure promoter during the process of PDCs. The successful fabrication of this heterogeneous promoter offered a promising perspective for the emerging responsive ceramifiable technology.
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Small
·
2024
·
IF 13
Bocong Zou,Yang Yang,Hulin Wang,Weijun Li,Lin Wang,Fengmei Gao,Dongdong Zhang,Marko Gloginjić,Marko Erić,Srdjan Petrović,Weiyou Yang,Huan He,Shanliang Chen
In the realm of photodetector (PD) technology, photoelectrochemical (PEC) PDs have garnered attention owing to their inherent advantages. Advances in this field depend on functional nanostructured materials, which are pivotal in improving the separation and transport of photogenerated electron–hole pairs to improve device efficiency. Herein, a highly photosensitive PEC UV PD is built using integrated self-supporting SiC/ZnS heterojunction nanowire array photoelectrodes through anodization and chemical deposition. Compared with the original SiC nanoarrays, the optimized SiC/ZnS-25 nanoarrays exhibit high photocurrent density ( D ph , 809.2 µA cm −2 ), rapid rise/decay times ( τ r / τ d , 4/21 ms), high responsivity ( R λ , 1.226 A W −1 ), remarkable detectivity ( D * , 2.517 × 10 11 Jones), and large external quantum efficiency ( EQE , 40.57%) under 375 nm UV light with a bias voltage of 0.6 V. Furthermore, SiC/ZnS-25 delivers excellent self-powered performance, with R λ , D * , and EQE reaching 0.91 A W −1 , 1.69 × 10 11 Jones, and 30.24%, respectively. In addition, the device exhibits excellent long-term operation and aging stability under a bias voltage of 0.6 V and under self-powered conditions. The excellent photodetection behaviors of the SiC/ZnS PEC PD are mainly ascribed to the synergistic effect of the novel well-aligned nanowire geometry, heterojunction with ZnS nanofilms of optimal thickness, and integrated self-supporting configuration of the photoelectrode.
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PubMed
高影响因子
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