Journal of Environmental Chemical Engineering
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2025
·
IF 7.2
Haonan Guo,Bingzhu Wang,Pengcheng Hu,Haiwang Wang
The photocatalytic material CdS has the advantages of a narrow energy gap and a suitable conduction band potential, but the rapid compounding of photogenerated carriers limits its large-scale application. To overcome these drawbacks, MWCNTs-CdS composites were prepared in this work and the thermodynamic and kinetic behaviour during the hydrothermal growth of MWCNTs-CdS was investigated. On this basis, the microscopic morphology of MWCNTs-CdS was regulated by designing the ratio of oleic acid and oleylamine, which in turn improved the photocatalytic hydrogen production efficiency of MWCNTs-CdS. The results showed that MWCNTs effectively improved the photogenerated carrier utilisation efficiency of CdS, and with the prolongation of hydrothermal time and the increase of temperature, the crystallinity of CdS increased and the photogenerated electron-hole complexation rate decreased. In addition, the introduction of oleic acid and oleylamine led to a decrease in the particle size and an increase in the specific surface area of MWCNTs-CdS, which in turn enhanced the photocatalytic performance. Under the light condition, the hydrogen production rate of MWCNTs-CdS(OAc:OAm=0.5:1.5) reached 189.10 μmol/g/h, which was 13.30 times higher than that of pure CdS.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 17
·5535
·
IF 4.927
Jixiang Hou,Xu Zhang,Kaiwen Wang,Peijie Ma,Hanwen Hu,Xiyuan Zhou,Kun Zheng
As a promising metal-free photocatalyst, graphitic carbon nitride (g-C3N4) is still limited by insufficient visible light absorption and rapid recombination of photogenerated carriers, resulting in low photocatalytic activity. Here, we adjusted the microstructure of the pristine bulk-g-C3N4(PCN) and further loaded silver (Ag) nanoparticles. Abundant Ag nanoparticles were grown on the thin-layer g-C3N4nanosheets (CNNS), and the Ag nanoparticles decorated g-C3N4nanosheets (Ag@CNNS) were successfully synthesized. The thin-layer nanosheet-like structure was not only beneficial for the loading of Ag nanoparticles but also for the adsorption and activation of reactants via exposing more active sites. Moreover, the surface plasmon resonance (SPR) effect induced by Ag nanoparticles enhanced the absorption of visible light by narrowing the band gap of the substrate. Meanwhile, the composite band structure effectively promoted the separation and transfer of carriers. Benefiting from these merits, the Ag@CNNS reached a superior hydrogen peroxide (H2O2) yield of 120.53 μmol/g/h under visible light irradiation in pure water (about 8.0 times higher than that of PCN), significantly surpassing most previous reports. The design method of manipulating the microstructure of the catalyst combined with the modification of metal nanoparticles provides a new idea for the rational development and application of efficient photocatalysts.Keywords:carbon nitride;hydrogen peroxide;microstructure manipulation;metal nanoparticle modification;photocatalyst
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 30
·64796-64804
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IF 5.6
Zhenghuang Quan,Zhoufu Wang,Hao Liu,Yan Ma,Shen Zhou,Pingtao Fang,Chao Shu
Yttrium oxide is widely recognized as a critical refractory material for superalloy purification smelting, owing to its high melting point, excellent vacuum chemical stability, and low alloy wettability. However, its inherent brittleness and high thermal expansion coefficient lead to poor thermal shock resistance, which severely restricts its practical industrial applications. To address this limitation, this study utilized La 3+ /Nb 5+ co-doping to fabricate Y 2 O 3 -based composites and systematically investigated their phase structure, microstructure, and overall properties. XRD Rietveld refinement and density functional theory (DFT)-based first-principles simulations confirmed that La 3+ preferentially substitutes Y 3+ at the Y1 lattice site, while Nb 5+ occupies the Y2 site, inducing significant lattice distortion and generating cation vacancies for charge balance. Microstructural observations revealed that co-doping triggers bimodal grain growth-characterized by small, loosely bonded grains with low Nb 5+ content and large grains containing intergranular pores attributed to high Nb 5+ substitution-resulting in increased apparent porosity but enhanced material toughness. Mechanical and thermal shock tests showed that while room-temperature flexural strength decreases, thermal shock resistance is drastically improved. When the La 3+ /Nb 5+ co-doping molar ratio was Y 2 O 3 : La 2 O 3 : Nb 2 O 5 = 1:0.050:0.050 (corresponding to the YLN10 sample), the composite exhibited the optimal overall performance: its room-temperature flexural strength reached 45.57 MPa, residual strength retention after thermal shock was 58.43 %, and elastic modulus retention was 87.91 %, effectively balancing mechanical properties and thermal shock stability. These improvements are primarily attributed to pore-mediated thermal stress dissipation and crack deflection effects. This work demonstrates that La 3+ /Nb 5+ co-doping is an effective strategy to balance the mechanical rigidity and thermal shock stability of Y 2 O 3 , providing a valuable reference for optimizing refractory materials for high-temperature superalloy smelting.
研究领域:
材料科学
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无机非金属材料
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高温功能陶瓷
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固态化学
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计算材料学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Qingsong Liu,Jinlong Gao,Chuntian Cao,Geping Yin,Zaixing Jiang,Mingyuan Ge,Xianghui Xiao,Wah-Keat Lee,Jiajun Wang
Sodium ion batteries (SIBs) are considered a potential energy storage technology due to their low cost and the abundance of sodium resources. Numerous strategies have been made to address the remaining challenges such as low electronic conductivity, huge volume change, and sluggish sodium ions kinetics. In spite of impressive advances, a comprehensive understanding of the microstructure-stability correlation remains elusive. Here, the three-dimensional (3D) Fe 3 S 4 flower-like hierarchical materials constructed from two-dimensional (2D) nanosheet building units were synthesized via a facile and cost-effective method. Instead of materials synthesis and performance evaluation, more attentions have been paid on the underlying coupling mechanism between microstructure design, surface chemistry and 3D electronic/ionic transport pathways. It found that the thin and stable SEI layer generated by ether-based electrolytes contributes to the stable surface chemistry and fast interfacial Na + ion transport, while 3D hierarchical structure enables short diffusion distance, volume change accomodation as well as stabilizing SEI layer. Taking advantage of the inherent high electronic conductivity in Fe 3 S 4 , we have demonstrated the paramount importance of the synergistic strategy to improve the stability of SIBs through X-ray nanotomography. This work explicitly illuminate the electrochemical stability mechanisms of 3D hierarchitectures and resolves new strategies to rational design SIBs anodes.
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
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固体物理
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界面化学
✓ 已验证
DOI
高影响因子
CARBON
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2020
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IF 8.821
Yan Cheng,Huanqin Zhao,Yue Zhao,Jieming Cao,Jing Zheng,Guangbin Ji
Mesoporous carbon hollow sphere (MCHS) is one of the most significant functional materials in various fields. Unfortunately, systematically regulating microstructure of MHCS has been rarely investigated so far. In this work, using one unique simultaneous-hydrolyzation-polymerization process, we are able to precisely control the morphology configurations of MCHS, including its shell thickness and integrate size, hollow void and mesopore in the shell. The shell thickness and integrate size are associated with the synergistic effect of hydrolyzation and polymerization reactions. The hollow void and mesopore are determined by the SiO 2 template morphology. Thus, a series of MCHSs with controlled microstructure were achieved through elaborately tuning the precursor. More importantly, different types of MCHSs demonstrate significantly different dielectric and microwave absorbing properties due to the discrepancy of volume ratio between pores and carbon compositions. The typical sample could achieve a broad effective absorption bandwidth of 5.9 GHz and 6.5 GHz with a thickness of 2.35 mm and 2.65 mm, respectively, at a filling ratio of only 20 wt%. These encouraging results significantly promote a deeper understanding of the fundamental chemistry mechanism for constructing MCHS as well as using the material as potential candidate for solving microwave interference issue.
研究领域:
材料科学
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纳米技术
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电磁材料
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Yanwei Sun,Chunshan Song,Xinwen Guo,Sungwon Hong,Jungkyu Choi,Yi Liu
Metal-organic framework (MOF) membranes have received increasing attention due to their unprecedented potential for energy-efficient gas separation. Compared with other MOF materials (like ZIF), fabrication and microstructural manipulation of high-performance Ti-MOF-based membranes, although being very attractive due to their excellent chemical and thermal stability, remained relatively less investigated due to the limitations of available titanium sources and heating modes. In this study, different Ti sources (TPOT, TiS 2 , and MXene) and heating modes (conventional heating, multi-mode microwave heating, and single-mode microwave heating) were examined for the preparation of NH 2 -MIL-125 membranes showing diverse microstructures and gas separation performances. The present work revealed that for the first time, MXene , the new two-dimensional Ti carbide , could be used as Ti source for synthesizing MOF membranes. The best performing NH 2 -MIL-125 membranes, which were obtained with TiS 2 as the metal source under single-mode microwave heating, exhibited the highest H 2 /CO 2 selectivity (ca. 17.2) as well as considerable H 2 permeance (1.7 × 10 −7 mol m −2 s −1 Pa −1 ), owing to an enhanced non-thermal effect of single-mode microwave heating and balanced dissolution rate of TiS 2 .
研究领域:
材料科学
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膜分离技术
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化学工程
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纳米材料
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气体分离
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可持续能源
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
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2025
·Vol. 51
·期 27
·54471-54479
·
IF 5.6
He Chen,Lina Lv,Xiaoyu Li,Tingting Deng,Hao peng,Weicheng Xiang,Fangting Chi
Radioisotope thermoelectric generators (RTGs) produce electrical energy exclusively through the natural decay of radioactive materials, rendering them an ideal power source for space missions and other extreme environments. 241 Am is viewed as a promising substitute for 238 Pu as the heat-generating nuclide in these applications. However, there is currently no consensus on the sintering of 241 Am (Ⅲ) pellets. In this research, Nd (Ⅲ) oxide was used as a surrogate for americium (Ⅲ) oxide, and conventional cold-press-and-sinter methods were employed. Through a systematic investigation of the heating rate, holding time, and maximum temperature during the sintering of Nd (Ⅲ) oxide pellets made from commercial materials, an optimized sintering thermal cycle was developed. This curve enhances sintering efficiency and results in pellets with an open pore network, which is crucial for helium gas release. This work is significant in advancing the research and development of 241 Am nuclear batteries.
研究领域:
核化学
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材料科学
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能源工程
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空间电源技术
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固态离子学
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放射化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2025
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IF 9.5
Jinping Yu,Guangzeng Cheng,Ziwei Lu,Yonghui Wang,Fanlu Meng,Jingyi Wu
Composite polymer electrolytes (CPE) combining polymer matrix and functional fillers have gained significant attention due to their potential to overcome the limitations of single-component electrolytes. However, the disordered ion transport networks in conventional CPE limit their ionic conductivity and interfacial stability. Here, we propose a shear-induced alignment strategy to construct anisotropic architectures through precisely orienting lithiated cellulose nanocrystals (CNCs-Li) within poly(ethylene oxide) matrices. This ordered microstructure establishes planar Li⁺ transport highways with optimized coordination environments, achieving a room temperature (RT) ionic conductivity of 0.107 mS cm-1, representing a 1.7-fold enhancement over randomly structured counterparts. Facilitated ion migration enables homogeneous lithium deposition, demonstrating long-term cycling of 3200 h at 0.1 mA cm-2 under 60 °C in Li symmetric cells. The assembled LiFePO4/Li ASSLBs can maintain steady operation 500 cycles with an 85% capacity retention at 1 C and 60 °C and deliver RT capacities of 140 mAh g-1 at 0.5 C. This work provides a scalable strategy for designing high-performance CPE through structural anisotropy control.
研究领域:
材料科学
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电化学
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高分子科学
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纳米技术
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储能
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
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2022
·Vol. 29
·期 11
·2012-2019
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IF 3.85
Hu Weiqiang,Gong Fengming,Liu Shaocun,Tan Jing,Chen Songhua,Wang Hui,Ma Zongqing
The oxide dispersion strengthened Mo alloys (ODS-Mo) prepared by traditional ball milling and subsequent sintering technique generally possess comparatively coarse Mo grains and large oxide particles at Mo grain boundaries (GBs), which obviously suppress the corresponding strengthening effect of oxide addition. In this work, the Y 2 O 3 and TiC particles were simultaneously doped into Mo alloys using ball-milling and subsequent low temperature sintering. Accompanied by TiC addition, the Mo−Y 2 O 3 grains are sharply refined from 3.12 to 1.36 µm. In particular, Y 2 O 3 and TiC can form smaller Y−Ti−O−C quaternary phase particles (∼230 nm) at Mo GBs compared to single Y 2 O 3 particles (∼120 nm), so as to these new formed Y−Ti−O−C particles can more effectively pin and hinder GBs movement. In addition to Y−Ti−O−C particles at GBs, Y 2 O 3 , TiO x , and TiC x nanoparticles (<100 nm) also exist within Mo grains, which is significantly different from traditional ODS-Mo. The appearance of TiO x phase indicates that some active Ti within TiC can adsorb oxygen impurities of Mo matrix to form a new strengthening phase, thus strengthening and purifying Mo matrix. Furthermore, the pure Mo, Mo−Y 2 O 3 , and Mo−Y 2 O 3 −TiC alloys have similar relative densities (97.4%–98.0%). More importantly, the Mo−Y 2 O 3 −TiC alloys exhibit higher hardness (HV 0.2 (425 ± 25)) compared to Mo−Y 2 O 3 alloys (HV 0.2 (370 ± 25)). This work could provide a relevant strategy for the preparation of ultrafine Mo alloys by facile ball-milling.
研究领域:
材料科学
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金属合金制备
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微观结构调控
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yi-Ning He,Ren-Zhong Zhang,Jia-Min Wu,Ze-Yu Deng,Ze-Yuan Li,Jia-Xin Zheng,Lin Guo,Zhi-Xiang Cai,Yu-sheng Shi
SiO 2 -based ceramics are an ideal material for manufacturing radomes due to their thermal stability, high dielectric properties, and simple processing techniques. However, traditional manufacturing methods heavily rely on molds, making it difficult to form complex SiO 2 -based ceramic structures. Digital Light Processing (DLP) technology was applied to fabricate SiO 2 -based ceramics doped with Al 2 O 3 -MgO in this work. The influence of the Al 2 O 3 -MgO content on the SiO 2 -based ceramics was systematically investigated. Increasing Al 2 O 3 -MgO content causes a shrinkage to first decrease then increase, contrasting with the flexural strength's initial increase and subsequent decrease. The main reason is magnesium-aluminum spinel (MgAl 2 O 4 ) generated during the sintering process and thus retards crack propagation, promoting a transition in fracture mode. During the fracture stage, the fracture mode of samples with 10.0 wt% Al 2 O 3 -MgO is mainly transgranular fracture, instead of intergranular. This transition in fracture mode enhanced the flexural strength. Meanwhile, as the Al 2 O 3 -MgO content continues to increase, excessive spinel causes agglomeration within the ceramic microstructure. When the Al 2 O 3 -MgO content reached 10.0 wt%, the shrinkage decreases to a minimum of 3.32 %, and the flexural strength increases to a maximum of 15.94 MPa, making it suitable for manufacturing ceramic radomes. The research results provide a new solution for manufacturing SiO 2 -based ceramic radomes by DLP.
研究领域:
陶瓷材料
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增材制造
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材料科学
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材料电学性能
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微观结构调控
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shuang Yin,Jiajun Liu,Chengyun Sun,Yao Zhang,Liqiang Liu,Ruzhong Zuo
In this study, high-performance fused silica ceramics were fabricated from bimodal distribution powders via gelcasting and pressureless sintering. The solid loading of slurries (60–85 vol%) and sintering conditions (1280 °C for 1–6 h) significantly influenced the composition, microstructure, sintering, and mechanical behavior of fused ceramics. Increasing solid loading promoted densification, enhanced bulk density, and inhibited cristobalite precipitation. In contrast, extending holding time enhanced viscous flow and densification, but increased cristobalite precipitation. Therefore, both solid loading and holding time must be optimized to enhance material densification and suppress cristobalite precipitation. Fused silica ceramics prepared under 80 vol% solid loading and 3 h holding time showed optimal overall performance. They achieved a bulk density of 2.00 g/cm 3 , a flexural strength of 71.21 MPa, and a linear thermal expansion coefficient (approximately 10 −6 /°C) within the range from room temperature to 1000 °C. Following 20 thermal shock cycles between room temperature and 1000 °C, the material retained a residual flexural strength of 23.64 MPa, with a corresponding strength retention rate of 33.20 %. This study provides valuable guidance for fabricating high-strength fused silica ceramics via gelcasting and pressureless sintering.
研究领域:
陶瓷工程
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材料科学
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微观结构调控
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力学性能
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热震性能
✓ 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）