JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Wenhao Dou,Daxin Li,Bingzhu Wang,Zhihua Yang,Dechang Jia,Ralf Riedel,Yu Zhou
The microstructural evolution of C sf /SiBCN composites and formation mechanism of the oxide layer after oxidation for 1–10 h at 1500 ℃ were studied. As the oxidation time increases to 10 h, the macrostructure of the porous C sf /MA-SiBCN composite collapses obviously, while the C sf /SiBCN composite densified via the polymer infiltration and pyrolysis (PIP) process maintains structural integrity due to the formation of the oxide layer with a tri-layer structure: the outermost loose layer mainly containing cristobalite, the dense interlayer of amorphous glass and the innermost layer of some unoxidized BN(C) and SiC grains embedded into the amorphous glass, which hinders the diffusion of oxygen.
研究领域:
材料科学
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复合材料
·
氧化行为
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Shaoxiong Li,Huiyu Duan,Tong Xu,Yueshuai Wang,Longcheng Zhang
Abstract Direct seawater electrolysis at industrially relevant current densities is constrained by chloride adsorption, competing chlorine oxidation, and accelerated anode corrosion. Here, we identify interfacial stannate formed during anodic operation as a key species responsible for suppressing Cl– adsorption and competing chlorine evolution. Operando Raman spectroscopy, inductively coupled plasma mass spectrometry, and time-of-flight secondary ion mass spectrometry reveal the partial dissolution of incorporated Sn species and the enrichment of stannate at the reconstructed catalyst–electrolyte interface, while density functional theory calculations further support its role in weakening Cl– adsorption. The resulting Sn-containing NiFe anode requires an overpotential of 377 mV to reach 1 A cm–2 and sustains operation at 1 and 2 A cm–2 for 1500 and 850 h, respectively. An anion-exchange-membrane electrolyzer further delivers 1 and 4 A cm–2 at cell voltages of 1.90 and 2.54 V at 80 °C, operates continuously for 1000 h at 1 A cm–2, and withstands 4500 start–shutdown cycles over 250 h. These results establish a direct link between working-state stannate chemistry and long-term chloride resistance under ampere-level seawater electrolysis.
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DOI
高影响因子
GREEN CHEMISTRY
·
2026
·
IF 10.6
Yujie Ren,Bin Zhu,Qiuge Wang,Shuyi Wang,Sheng Chen,Jian Zhang,Chunlin Chen
Amid the global energy transition and the drive toward carbon neutrality, converting biomass into high-value chemicals has become a key research priority. In particular, the electrocatalytic oxidation of bio-based 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) has garnered significant interest. Nickel-based catalysts show great promise for the HMF oxidation reaction (HMFOR). However, their practical application is limited by the complicated and environmentally unfriendly preparation procedures, as well as the stringent requirements for high-purity reagents and water. This study proposes a green synthesis strategy that integrates catalyst fabrication and biomass electrooxidation using natural seawater. By employing seawater as a hydrothermal corrosion medium, nickel foam (NF) is reconstructed into a highly efficient catalyst. The obtained NF-sw-120 electrode delivers outstanding performance in an alkaline seawater electrolyte, achieving a FDCA yield of 97.5% and a faradaic efficiency (FE) of 97.6%. Moreover, it exhibits exceptional stability after continuous electrolysis for 1500 hours. Mechanistic investigations reveal that seawater simultaneously suppresses the competing oxygen evolution reaction (OER) while promoting the HMFOR, leading to higher current density and improved energy efficiency. This work provides a sustainable and cost-effective route for fabricating high-performance biomass electrocatalytic materials.
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Qi You,Zhongyang Wu,Yongjun Li,Ya Zhong,Sisi Shang,Man Yuan,Yichen Ou,Huanhuan Xu,Sheng Cui
Mullite aerogel is considered a promising candidate for thermal protection. However, structural collapse and poor temperature resistance limit its application at high temperature. Herein, amorphous SiOC-coated mullite aerogels (MAs) were prepared by high-temperature calcination, using Al 2 O 3 nanorods and SiO 2 particles as precursor units. The one-dimensional submicron skeleton prevents weak pearl chain connections and high surface energy, while the nanoscale amorphous SiOC layer protects the encapsulated mullite skeleton, ensuring a strong skeleton and pores at high temperatures. MAs exhibit a low thermal conductivity of 0.0375 W/(m·K) at room temperature, a robust compressive strength of 0.369 MPa, and good thermal stability: after 30 min of annealing at 1500 ℃, the minimal linear shrinkage of MAs was 0.72 %. Interestingly, the amorphous SiOC layer grew into nanowires under a butane flame, which reconstructed the network and impeded the heat flow. Thus, the novel MAs exhibit considerable thermal insulation advantages in harsh environments.
研究领域:
材料科学
·
热防护技术
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DOI
高影响因子
Crystals
·
2024
·Vol. 14
·期 3
·279
·
IF 2.4
Yang Wu,Hao Lan,Xiaoming Sun,Zihao Hu,Yonghui Sun,Huifeng Zhang,Chuanbing Huang,Weigang Zhang
HfO2has become a promising thermal barrier coating material due to its similarity in structure and chemical properties with ZrO2and its higher phase structure transition temperature. However, the fracture toughness of HfO2is not ideal, greatly limiting its application. In this report, we find a special sandwich structure of ceramics, comprising a cubic (C) phase /monoclinic (M) phase/cubic (C) phase. The microstructural evolution and mechanical properties of these ceramics were investigated under annealing at 1500 °C. The results indicate that, with an increase in annealing duration, there was a gradual augmentation in the proportion of the monoclinic (M) phase and the fracture toughness increased from 2.18 MPa·m0.5to 2.83 MPa·m0.5after 48 h of annealing, which is higher than many potential TBC materials. The residual compressive stress present in the M phases during the progression of crack propagation served to facilitate the bridging and deflection of cracks. As such, this process led to the alleviation of stress concentration at the crack tip, ultimately enhancing the toughening effect.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
CORROSION SCIENCE
·
2021
·
IF 7.205
Lu Zhu,Xuanru Ren,Guochao Wang,Xueqin Kang,Ping Zhang,Xiaohong Wang,Peizhong Feng
Spark Plasma Sintering technique was applied to fabricate MoSi 2 and MoSi 2 -bentonite coatings on molybdenum. The phase composition, morphologies and anti-oxidation properties of the coatings at 1500 °C were investigated. Penetrated cracks generated in MoSi 2 coating after SPS while the composite coating was crack-free because of the reduction of CTE mismatch. Cracks existed in the silica layer of MoSi 2 coating after oxidation while the silica layer of bentonite-containing coating showed dense and crack-free morphologies. Compared with MoSi 2 , the composite coating possessed thinner Mo 5 Si 3 diffusion layer and silica layer, exhibiting less loss of substrate and coating with improved oxidation resistance.
研究领域:
材料科学
·
表面工程
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 110
·109253-109258
·
IF 3.289
Yujia Wan,Yanyan Feng,Decheng Wan,Ming Jin
For supported metal nanoparticles, the ligand/support is crucial to their catalytic activity, stability and recyclability. Here we show that a polyamino dendritic amphiphile is a versatile mediator for supported platinum nanoparticles (PtNPs). PEI@PS-EHA, a branched polyethylenimine (PEI) with a shell of poly(styrene-co-2-ethylhexyl acrylate) (PS-EHA), will self-assemble along the interface of a water-in-oil (W/O) emulsion, and stabilize a corresponding high internal phase emulsion (HIPE); after transformation of the HIPE into an open-cellular material termed polyHIPE, PEI@PS-EHA will act as a surface modifier to immobilize PtNPs. The supported catalyst is very fit for reduction reactions because the Pt species hardly leaches in a reductive environment (judged just from the leaching data, the catalyst can be recycled over 10 million times). No ripening of the supported PtNPs is found for over 1500 equivalent cycles, as judged from the apparent rate constant. The ready separation, high activity, extremely low metal leakage and high durability make the catalyst promising.
研究领域:
化学工程
·
催化材料
·
纳米技术
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DOI
高影响因子
CORROSION SCIENCE
·
2017
·
IF 5.245
Daxin Li,Zhihua Yang,Dechang Jia,Xiaoming Duan,Shengjin Wang,Qishuai Zhu,Yang Miao,Jiancun Rao,Yu Zhou
The high-temperature oxidation behavior of various boron addition SiBCN monoliths has been explored. Boron addition promotes the formation of new B x C phase and growth of SiC gains. At the initial stage of oxidation, surface B x C and BN(C) are prior to SiC generating B 2 O 3 . As time progresses, SiC oxidizes to SiO 2 further reacted with B 2 O 3 forming stable SiO 2 -B 2 O 3 binary melt or borosilicate. Boron-enhanced SiC oxidation occurs immediately with the rapid consumption of BN(C), B x C and loss of B 2 O 3 from borosilicate decomposition, thereby promoting oxidation rate. Substantial SiC and BN(C) in amorphous SiO 2 for transition layer is the main structure feature.
研究领域:
材料科学
·
化学
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产品关联
DOI
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.
研究领域:
材料科学
·
航空航天工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shiquan Zhang,Jian Zhang,Suohui Yang,Minxian Shi,Junguo Li,Qiang Shen
Ablation material had been widely used in aerospace attributed to its reliability and strong adaptability but was usually accompanied by low strength at higher temperatures. Here, a high flexural strength of 66.91 MPa after ablation at 1500 °C of carbon fiber/boron phenolic resin (CF/BPR) composite modified by MoSi 2 and mica was reported. With the proportion of MoSi 2 and mica was 9:1, the formed appropriate content of the liquid phase improved the reactivity of MoSi 2 powders and provided a suitable interfacial state between CF and the matrix. The result of the oxygen-acetylene test showed that the mass ablation and the linear ablation reduced to 0.034 g/s and 0.006 mm/s, respectively. Owing to the formed liquid phase wrapping the carbon fiber and ceramic layer on the surface improved the ablation resistance. These high-strength CF/BPR composites have strong potential in new aerospace materials.
研究领域:
材料科学
·
航空航天工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mengchuan Li,You Zhou,Tongsheng Zhang,Rensheng Li
The sluggish advancement in technology for the recovery of rare earth elements from secondary resources can be largely attributed to an inadequate understanding of the thermodynamic properties of cerium oxide-based slag systems. This study systematically investigates the phase equilibrium of the Ce 2 O 3 -CaO-SiO 2 -5 wt% MgO quaternary system at 1500 °C and 1600 °C. High-temperature equilibrium experiments followed by rapid quenching were conducted, and phase assemblages were characterized by XRD, SEM and EPMA. For the first time, the results accurately determined the isothermal liquidus lines for the first time and identified the stable regions of key phases such as SiO 2 , Ce 2 Si 2 O 7 , CaO·2Ce 2 O 3 ·3SiO 2 , CaO·Ce 2 O 3 ·2SiO 2 , the Ce-doped dicalcium silicate (i.e., (Ca, Ce) 2 SiO 4 ), and the monticellite (i.e., CaMgSiO 4 ), as well as their coexistence relationships. Furthermore, the isothermal sections at 1500 °C and 1600 °C were constructed based on experimental data and fundamental thermodynamic principles. This study not only fills a critical gap in the thermodynamic database for rare-earth slag systems but also provides a theoretical basis for optimizing slag design and enhancing cerium recovery from waste slags.
研究领域:
冶金物理化学
·
无机非金属材料
·
高温过程热力学
·
资源回收
·
稀土冶金
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Feng Jiang,Chenchen Li,Xiang Ling
Molybdenum (Mo) is a promising structural material for ultra-high temperature applications, but its catastrophic oxidative degradation remains a critical bottleneck. Conventional single-layer silicide coatings often fail prematurely due to either weak interfacial adhesion (spallation) or insufficient long-term structural stability (cracking). To overcome these limitations, a novel dual-layer composite coating was developed in this study. An inner Mo-Si diffusion layer (∼90 μm) was first fabricated by pack cementation process to ensure robust metallurgical bonding with the Mo substrate. Subsequently, an anti-oxidative outer layer (∼98 μm) containing MoSi 2 , boron and quartz was deposited using slurry sintering technique. Isothermal oxidation tests revealed that the composite coating exhibited excellent protective performance at 1500 °C in air, with only minimal mass loss of 0.178 mg/cm 2 after 9 h. Microstructural analysis demonstrated that bidirectional Si diffusion dynamically transformed the coating into a highly stable gradient structure of SiO 2 -Mo 5 Si 3 -MoSi 2 -Mo 5 Si 3 during high-temperature exposure. The superior oxidation resistance was attributed to a synergistic anti-oxidation mechanism: the inner layer physically anchored the coating to prevent spallation, while the outer layer continuously generated a B 2 O 3 -fluxed fluid borosilicate glass phase that effectively sealed microcracks and pores. This work provides an effective architectural design strategy for developing high-performance oxidation-resistant coatings on refractory metals in ultra-high temperature environments.
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DOI
高影响因子
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