VACUUM
·
2015
·
IF 1.858
Zhaobing Cai,Guo Jin,Xiufang Cui,Yang Li,Yang Fan,Jiahui Song
In this work, a NiCrCoTiV HEA was fabricated by vacuum hot-pressing sintering after planetary ball milling. The microstructure and phase composition were studied by experiment and thermodynamic simulation. The results show that some discrepancies are found between the calculated and experimental results, and the main difference is the existence of TiO phase. Experimental results indicate that, the alloy consists of a BCC phase, an FCC phase, an eta (η) phase, a TiO phase and Ni 2 V 3 intermetallic compounds , and BCC phase is enriched with Cr and V elements, FCC phase is enriched with Co, Ti and Ni and heavily depleted by V and Cr, and eta phase is enriched with Ni, Ti, and Co elements. The thermodynamic simulation results suggest that the solidification simulation predicts the composition of BCC phase, FCC phase and eta (η) phase very well, but can't predict the presence of Ni 2 V 3 intermetallic compounds. Without regard to the composition of each phase, the results of the simulated equilibrium phase diagram seem to be much closer to the experimental results.
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2015
·
IF 12.113
Haiyan Jin,Jing Wang,Diefeng Su,Zhongzhe Wei,Zhenfeng Pang,Yong Wang
Remarkable hydrogen evolution reaction (HER) or superior oxygen evolution reaction (OER) catalyst has been applied in water splitting, however, utilizing a bifunctional catalyst for simultaneously generating H2 and O2 is still a challenging issue, which is crucial for improving the overall efficiency of water electrolysis. Herein, inspired by the superiority of carbon conductivity, the propitious H atom binding energy of metallic cobalt, and better OER activity of cobalt oxide, we synthesized cobalt–cobalt oxide/N-doped carbon hybrids (CoOx@CN) composed of Co0, CoO, Co3O4 applied to HER and OER by simple one-pot thermal treatment method. CoOx@CN exhibited a small onset potential of 85 mV, low charge-transfer resistance (41 Ω), and considerable stability for HER. Electrocatalytic experiments further indicated the better performance of CoOx@CN for HER can be attributed to the high conductivity of carbon, the synergistic effect of metallic cobalt and cobalt oxide, the stability of carbon-encapsulated Co nanoparticles, and the introduction of electron-rich nitrogen. In addition, when used as catalysts of OER, the CoOx@CN hybrids required 0.26 V overpotential for a current density of 10 mA cm–2, which is comparable even superior to many other non-noble metal catalysts. More importantly, an alkaline electrolyzer that approached ∼20 mA cm–2 at a voltage of 1.55 V was fabricated by applying CoOx@CN as cathode and anode electrocatalyst, which opened new possibilities for exploring overall water splitting catalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2014
·
IF 3.679
Jian Yu,Wan-Feng Lin,Le-Hui Leng,Shao-Kui Bao,Jian-Ping Zou,Xu-Biao Luo,De-Zhi Chen,Sheng-Lian Luo,Chak-Tong Au
Novel heterostructured TiO 2 /Co 4 S 4.23 Se 3.77 composites were synthesized by a combination of solid-state and sol–gel methods, and were characterized by single-crystal X-ray diffraction, powder X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectroscopy, and photocurrent measurements. The results of photocatalytic degradation of methylene blue over the as-prepared materials indicate that photocatalytic efficiency is closely related to the composition of the materials, and the 30%TiO 2 /Co 4 S 4.23 Se 3.77 catalyst exhibits the best adsorption and photodegradation efficiency under sunlight or visible-light irradiation. The adsorption capacity of 30%TiO 2 /Co 4 S 4.23 Se 3.77 for methylene blue is 18.59 mg/g calculated based on the Langmuir adsorption model. Adsorption kinetics studies show that the process fits well with a pseudo-second-order rate mechanism. Recycle experiments confirm that the 30%TiO 2 /Co 4 S 4.23 Se 3.77 catalyst is stable. The present work illustrates a new way for the design and syntheses of stable and high-efficiency catalysts applicable for the degradation of organic pollutants.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Yiru Jia,Yi Pan,Haiying Wang,Rong Chen,Hua Wang,Xinjian Cheng
A fluorescent monomer of boron dipyrromethene (BODIPY) derivative ( 9AnPD) is designed and synthesized at first, and then it is introduced into polyurethane to obtain polymeric chemosensor with dangling fluorescent side groups. The monomer chemosensor 9AnPD exhibits highly selective properties to Hg 2+ ion in a wide pH range. The color of the monomer changed rapidly upon the addition of Hg 2+ ion. The fluorescence peak shifted and is enhanced about 4-flod. In addition, the monomer chemosensor reaches the detection limit of Hg 2+ is as low as 5 × 10 −6 m. When the fluorescent monomer is introduced to polymers, the sensing properties of the monomer chemosensor 9AnPD still remained. The polymer chemosensors not only exhibit fluorescence shift and color change for identifying Hg 2+ ion as its monomer chemosensor, but also improve the efficiency of detection. The detection limit of polymer chemosensor could reach 5 × 10 −7 m , and the fluorescence enhanced about 6-flod. The glass transition temperature (T g ) of the fluorescent PU is increased with the introduction of 9AnPD . However, it is about 60 °C, and will not lead to any adverse effect for the process. The molecular weights of PUs are lower than which without 9AnPD , but still of the macromolecular level.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Huirong Chen,Jiamin Li,Zixin Huang,Yi Zhang,Yuee Ruan,Xiaonan Luo,Fengfeng Chen,Ruliang Liu
The increasing demand for sustainable and efficient catalytic processes has driven the development of advanced nanoreactors. In this study, we present a sophisticated Metal–organic framework (MOF)-template-mediated approach to synthesize yolk–shell Co-CN@SiO2 nanoreactors, where Co nanoparticles were supported on carbon nitride (C–N) nanosheets as the core encapsulated within a nanoporous SiO2 shell. This yolk–shell structure with confined cavities can provide a high surface area and overcome challenges such as Co nanoparticle sintering and mass transport limitations, resulting in superior catalytic performance. Remarkably, these nanoreactors achieved a 99% yield of benzyl alcohol from benzaldehyde hydrogenation under base-free conditions. Moreover, the influence of calcination temperatures on the structural evolution of the Co-based silica nanoreactors was explored, revealing the critical role of synergistic interaction between C–N and Co nanoparticles in boosting catalytic activity. Density functional theory calculations were conducted to investigate the adsorption energies of reacting species on the catalyst, providing mechanistic insights into the enhanced hydrogenation activity of the Co-CN@SiO2. This work offers valuable insights into the rational design of advanced nanoreactors for various catalytic applications, particularly in the field of green chemistry and sustainable synthesis.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Jiawen Hu,Linwen Jiang,Jiawei Jin,Hang Liu,Anhua Wu,Xiaofeng Zhang
High-entropy alloys (HEAs) are important candidates for efficient electromagnetic-wave absorbing (EMA) materials, but the further design of HEA absorbers with harmonized impedance matching and excellent environmental stability remains a major challenge. In this study, a novel carbonitriding process based on a mechanochemical method is employed to prepare carbonitrided FeCoNiMn HEAs by utilizing a cyano-compound (C3H2N2) as a source of C and N. The introduction of C and N effectively optimizes the permittivity of FeCoNiMn HEAs, achieving the equilibrium of electromagnetic matching and thus improving the EMA performances (especially the bandwidth). The carbonitrided FeCoNiMn HEAs exhibit significant reflection loss (RL) and absorption capability. FeCoNiMnM0.04 achieves a minimum RL of −65.8 dB at 3.44 GHz. FeCoNiMnM0.08 achieves an ultra-broad effective absorption bandwidth (EAB) of up to 7.76 GHz at 1.62 mm, covering the entire Ku-band. In addition, the carbonitrided FeCoNiMn HEAs exhibit excellent corrosion resistance and good mechanical properties, ensuring their suitability for harsh environments. This study highlights the potential of carbonitrided HEAs prepared using a cyano-compound as highly efficient EMA materials, and provides a reference for optimizing the electromagnetic matching of HEAs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Xin Fan,Xiaoqin Tian,Jianxin Chi,Jiao Zhao,Youjin Zheng,Fangbiao Wang,Lei Zhang,Qi Chen,Hongan Ma
In this paper, the electropositive-electronegative double-filled skutterudite, which is challenging or impossible to synthesize via conventional methods, was successfully prepared using a high-pressure and high-temperature (HPHT) method. The successful filling of Ba-S into the voids of the CoSb 3 crystal structure was confirmed through X-ray diffraction, enthalpy of formation calculations, and EDS spectral analysis. The experimental results indicate that the skutterudite material with porous structure has a lower thermal conductivity of 1.07 W m −1 K −1 at 773 K. The Callaway model fitting analysis revealed that the introduction of Ba, S, and Te enhances both point defect scattering and resonance scattering, thereby effectively reducing the lattice thermal conductivity Consequently, the sample achieves a maximum zT value of 1.44 at 773 K. This work provides novel insights into the study of thermoelectric properties in skutterudite materials.
✓ 已验证
产品关联
DOI
高影响因子
Thermal Science and Engineering Progress
·
2025
·
IF 5.4
Dongyang Qiu,Paul Amyotte,Hao Zeng,Zuyang Du,Qi Zhao,Xianfeng Chen,Chuyuan Huang,Lijuan Liu,Yi Li,Xuxu Sun
Natural gas holds enormous potential in the low-carbon transition of the global energy system, but the risk of explosions from gas leaks poses severe threats to life and property. In this study, sodium phytate and carbamide were introduced as active components, and through hydrogen bonding and ionic interactions between sodium alginate and k-carrageenan, a bio-based modified gel dry water powder (PC-GDW) was prepared and applied for the suppression of 9.5 % methane (CH 4 )-air mixture explosions. The results demonstrate that the physical performance and explosion suppression effect of dry water (DW) could be improved by optimizing the core solutions and gels. CO 2 -driven with 12 g of PC-GDW effectively weakened the energy generated by the CH 4 explosion and dissipated the reflected pressure wave, thus preventing the explosion flame from propagating to the rear of the suppression zone. Compared with the CH 4 explosion without any suppression, the peak temperature ( T p ) decreased by 94.8 %, while the maximum explosion pressure ( P max ) and maximum rise rate of pressure ((d p /d t ) max ) were reduced by 62.5 % and 71.8 %, respectively. Moreover, the synergistic suppression mechanism of the multiphase system was revealed. This work confirms that PC-GDW is a green and renewable explosion suppression material with potential applications in gas transportation and utilization.
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2025
·Vol. 15
·期 1
·1-18
·
IF 3.9
Cui Haotian,Yang Rongqian,Cui Gongjun,Li Xun,Li Junxia,Kou Ziming
This research aims to design a high-temperature wear resistance cobalt-based coating of hot-end parts as protective coating. The cobalt-based matrix coatings were reinforced by NiCrAlY and different contents of TiC (6.0, 8.0 and 10.0 wt%) using laser cladding technology. Some efforts were made to explore the influence of TiC on the microstructure, hardness and wear behavior of prepared coatings. The wear behavior of coatings was done via a ball-on-disk wear machine under room temperature -800 °C. The results showed that NiCrAlY decomposed and formed γ-Co(fcc) and β-NiAl phases. The hardness of coatings with TiC was reinforced due to the fine-grain strengthening and dispersion strengthening. The friction coefficients of reinforced coatings were destroyed due to the TiC particle and in-situ synthetized ceramic particles, whereas the wear resistance of coatings with TiC was enhanced. There existed an optimal content of TiC for the wear resistance of Co-NiCrAlY-TiC coatings. The coating with 8.0 wt% TiC had a satisfactory tribologcial performance at test temperatures. It was ascribed to the moderate hardness and in-situ synthetized solid lubricants, as well as the tribo-layer.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Jing Tang,Wenjian Wan,Siyuan Liu,Weijun Li,Jielei Tu,Chao Huang
Non-noble transition metals at the nanoscale offer a cost-effective and efficient solution for water splitting due to their abundance active sites and highly catalytic activity. However, nanoparticle aggregation during fabrication and electrochemical processes often leads to reduced stability and poor activity, particularly in the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In this study, we directly prepared ultrafine cobalt nanograins embedded in a three-dimensional (3D) flower-like N-doped carbon matrix (Co/N-C). These ultrafine Co nanoparticles provide abundant active sites, while the N-C matrix ensures high electrical conductivity. The Co/N-C composite demonstrates outstanding catalytic performance, with low overpotentials of 361 mV for OER and 80 mV for HER at 10 mA cm -2 . The Tafel slopes are also favorable, at 49.28 mV dec -1 for OER and 63.09 mV dec -1 for HER. Moreover, the Co/N-C catalyst outperforms commercial IrO 2 , exhibiting a lower overpotential of 398 mV at 50 mA cm -2 for OER compared to 464 mV for IrO 2 . A cell constructed using the Co/N-C||Co/N-C couple achieves a voltage of 1.676 V at 10 mA cm -2 and maintains a stable current for an impressive 35 h. This novel synthesis approach and material provide a valuable reference for integrating N-doped carbon with other ultrafine metal nanoparticles for various energy-related applications.
✓ 已验证
产品关联
DOI
高影响因子
Matter
·
2025
·
IF 17.5
Shining Wu,Yuting Zhang,Guanwu Li,Yifeng Hou,Mengyang Cao,Chengyu Wei,Pengkun Yang,Lu Huang,Yingpeng Wu
High-entropy alloys (HEAs) have a wide range of applications due to their excellent physical and chemical properties. However, traditional synthesis routes always require high temperatures over 923 K or have high equipment requirements. Here, we developed a liquid metal gallium (Ga)-mediated strategy using only a commercial vortex mixer and metal powders to synthesize HEAs near room temperature (303 K) with low power (7 W). A variety of HEAs were successfully prepared, and the yield can be expanded to over 10 g each time. The mechanistic investigation proved that Ga continued to flow under the mechanical force and exposed fresh surfaces to contact the metal, thereby promoting the process of metal dissolution in Ga and forming HEAs. These as-prepared HEAs can be used for catalysis in electrochemical oxygen evolution reactions with low overpotential and high durability. This strategy provides an innovative method for low-energy synthesis of HEAs at room temperature.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Zhaohui Fei,Chi Jiang,Qunwei Tang,Yingfei Hou
To solve the scarcity of fresh water, reverse osmosis (RO) technology for seawater desalination and wastewater reuse has been developed rapidly. However, the performance of RO is limited by poor selectivity towards certain harmful small molecule constituents (e.g., boron in seawater and N-nitrosodimethylamine in wastewater) and the permeability-selectivity trade-off. Herein, a metal polyphenol network interlayer including both hydrophobic zone and monomer adsorption zone is proposed to optimize interfacial polymerization (IP) process for fabrication of RO membrane . This heterogeneous characteristic is endowed by well-chosen phenol (i.e. TTSBI) and metal (Ni). The physicochemical properties of the substrate are also optimized. An ultra-selective RO membrane with thinner separation layer, higher crosslinking degree and larger surface area is obtained. The RO membranes exhibit separation performance beyond the upper selectivity limit for NaCl and hazardous small molecules. The membrane water permeance is 3.50 L m −2 h −1 bar −1 while the NaCl rejection is 99.5 %. Meanwhile, the mechanism of the interlayer influencing IP process is investigated by combining molecular simulation and experimental methods. Our work provides a novel design direction of substrate used for fabricating RO membrane with outstanding performance.
✓ 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）