COMPOSITES PART B-ENGINEERING
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2025
·
IF 14.2
Xiangren Bai,Xiang Zhang,Dongdong Zhao,Xudong Rong,Naiqin Zhao,Chunnian He
Strain localization at grain boundaries (GBs) is one of the key factors contributing to the trade-off between strength and ductility in engineering alloys. To address this issue, we developed a unique perpendicular interlocking structure connecting the matrix GBs by introducing trans -granular graphene nano-shells (SGSs) via a two-step targeted localized Cu–Al interdiffusion process. In the as-built structure, the original GBs served as the soft component, while the perpendicularly intersecting SGSs acted as the hard component. This configuration not only promotes sustainable dislocation accumulation in the vicinity of the GBs but also facilitates plastic strain delocalization through stress shielding effects from the SGSs. By effectively impeding the extension of shear bands and redirecting crack propagation towards the grain interiors, these hetero-structured GBs contribute to reducing the intrinsic brittleness of GBs. Consequently, the SGS/AlCu composite demonstrates a remarkable balance of tensile strength (∼574 MPa) and ductility (∼17 %). Our findings suggest that restructuring the geometry of GBs in metallic alloys presents a promising strategy for mitigating strain localization at GBs, offering potential for enhancing the properties of metallic alloys in various engineering applications.
研究领域:
材料科学
·
力学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Mingliang Zhu,Ruixia Yuan,Chijia Wang,Qinghe Gao,Huaiyuan Wang,Huijuan Qian
In this work, we designed and fabricated an anti-scaling and anti-corrosion superhydrophobic 1H,1H,2H,2H-perfluorodecyl triethoxysilane (PFDS)/ethylenediamine tetraacetic acid (EDTA)/anodized copper oxide (ACO) coating at the surface of a copper alloy. The water contact angle of PFDS/EDTA/ACO coating reaches 164.53°, showing superhydrophobicity, which will reduce the contact between scale crystals, corrosive medium and substrates, and help to inhibit scaling deposition and corrosion. Results show during the CaCO 3 deposition test, EDTA molecules, EDTA-Zn 2+ and EDTA-Cu 2+ chelates stored in the micro-structure of superhydrophobic PFDS/EDTA/ACO coating are released to the interface and help to improve scaling prevention. After soaking for 48 h, the CaCO 3 scaling mass of PFDS/EDTA/ACO coating was only 27.0 % that of ACO coating, and the corrosive protection efficiency of the superhydrophobic PFDS/EDTA/ACO coating was improved by 3.4 times that of ACO coating. Studies indicated that the anti-scaling and anti-corrosion of the superhydrophobic PFDS/EDTA/ACO coating contributes to the cooperation of superhydrophobic air film and the potential storage and dynamic release of EDTA, as well as the passivation layer formed on the substrate.
研究领域:
材料科学
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表面工程
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腐蚀与防护
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产品关联
DOI
高影响因子
ACS Materials Au
·
2022
·
IF 0
Qingsong Luo,Hai Wang,Liang Wang,Feng-Shou Xiao
Selective hydrogenation of acetylene to ethylene is an industrially important process to purify the raw ethylene stream for producing high-grade polyethylene. The supported Pd catalyst exhibits superior activity for acetylene hydrogenation but suffers from poor ethylene selectivity because of the easy overhydrogenation to produce ethane. Here, we report that the PdCu alloy nanoparticles within siliceous zeolite crystals effectively tuned Pd-catalyzed overhydrogenation into semihydrogenation. This catalyst displayed an ethylene selectivity of 92.9% with a full conversion of acetylene. Mechanism studies reveal that the zeolite fixation stabilized the alloyed structure, where the electron-enriched Pd surface benefits the rapid ethylene desorption to hinder the deep hydrogenation. This work provides an efficient strategy for a rational design of bimetallic metal catalysts for selective hydrogenations.
研究领域:
催化化学
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材料科学
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纳米技术
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DOI
ACS Nano
·
2025
·
IF 16
Ning He,Zhi Yuan,Chao Wu,Shibo Xi,Jingjing Xiong,Yucong Huang,Guanwu Lian,Zefan Du,Laihao Liu,Dawei Wu,Zhongxin Chen,Wenguang Tu,Zhigang Zou,Shuk-Yin Tong
Electrochemical nitrate reduction (NO3RR) to ammonia presents a promising alternative strategy to the traditional Haber–Bosch process. However, the competitive hydrogen evolution reaction (HER) reduces the Faradaic efficiency toward ammonia, while the oxygen evolution reaction (OER) increases the energy consumption. This study designs IrCu4 alloy nanoparticles as a bifunctional catalyst to achieve efficient NO3RR and OER while suppressing the unwanted HER. This is achieved by operating the NO3RR at positive potentials using the IrCu4 catalyst, which allows a Faradaic efficiency of 93.6% for NO3RR. When applied to OER catalysis, the IrCu4 alloy also shows excellent results, with a relatively low overpotential of 260 mV at 10 mA cm–2. Stable ammonia production can be achieved for 50 h in a 16 cm2 flow electrolyzer in simulated working conditions. Our research provides a pathway for optimizing NO3RR through bifunctional catalysts in a tandem approach.
研究领域:
电化学
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催化材料
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能源化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Jing Huang,Jiawei Dai,Jiannan Zhu,Rong Chen,Xiaoqi Fu,Hongfang Liu,Guangfang Li
Electrocatalytic reduction of CO 2 (CO 2 RR) represents a promising approach to reduce CO 2 emission and generate value-added chemicals. Herein, we developed bimetallic Au-Cu gradient alloy nanostructures (AuCu-g) comprising of ultrathin Cu-rich alloy surface and Au-rich alloy core as electrocatalyst via a facial solvothermal method. Impressively, the AuCu-g can stably generate a considerable amount of C 2 H 4 with faradaic efficiency (FE) ∼20 % at a low limiting potential of −0.4 V versus reversible hydrogen electrode (RHE) due to its unique gradient structure and multi-component tandem effect. The potential-dependent in situ Raman spectrum indicated an enhanced *CO adsorption strength and a remarkable CO intermediate generation over Au-Cu gradient alloy at low overpotentials during CO 2 reduction process. This work shines a light for developing mutilmetallics toward efficient CO 2 RR.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Chenghu Zhang,Zezhou Xing,Ying Li,Tong Xu,Yinghui Sun,Jie Bai
Utilizing metal alloying strategies to fully exploit the role of precious metals in upgrading biomass chemicals remains both a challenging task and a key sustainable strategy. To improve the hydrogen transfer efficiency of furfural molecules in the catalytic transfer hydrogenation pathway, we report a Pd–Cu alloy composite nanocatalyst supported on mesoporous-structured zirconia through electrospinning technology. The chemical states of Pd and Cu in the catalyst were studied using XRD, HRTEM and XPS characterization methods, proving the presence of the PdCu alloy. A series of synthesized monometallic and bimetallic catalysts were tested for their ability to catalyze the catalytic transfer hydrogenation of furfural. Results showed that the PdCu alloy catalyst exhibited excellent performance similar to that of the monometallic Pd catalyst. 95.6% furfural conversion and 91.5% furfuryl alcohol selectivity were achieved at 170 °C and 2 MPa N2 for 12 h, and the catalytic activity did not decrease significantly after 6 cycles. The excellent catalytic activity was mainly attributed to the alloy and solvent effects, which promoted the improvement in hydrogen transfer efficiency.
研究领域:
化学工程
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催化材料
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生物质转化
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
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2018
·
IF 4.484
Tengfei Long,Hongmei He,Jizhou Li,Mengke Yuan,Jianjia Wei,Zhongde Liu
Inspired by the knowledge that the chiroptical activity of Cu and Ag nanoclusters (NCs) is generally about several-fold larger than that of the corresponding Au NCs but poor stability and that alloy metal particles often demonstrate unique stability, in this contribution the synthesis of the chiral Au–Cu alloy NCs was attempted via reduction of varying mole fractions of metal precursors by sodium borohydride in the presence of d-/l-penicillamine (d-/l-Pen), to gain insights into the alloying effect on the chiroptical activity. As a result, the g factors of ∼0.57 × 10–3, obviously larger than that of the pure Au NCs, are found for the bimetallic Au–Cu NCs, suggesting that the incorporation of Cu heteroatoms plays a dramatic role for the creation of the strong optically active metal nanostructures. More importantly, compared with those of monometallic Cu counterparts, the optical active stability of bimetallic Au–Cu NCs is obviously improved because of the alloy formation. The location of the copper dopant, observed from the transmission electron microscopy results and deduced by the X-ray photoelectron spectroscopy measurements, can be speculated to be incorporated in both the “core” region and the “staple” region. Additionally, it was found that the different thiolated chiral molecule ligands exert influence on the chiroptical behavior of the Au–Cu NCs. Thus, the alloy formation strategy could produce novel nanostructures with the characteristic of large and stable chiroptical activity.
研究领域:
纳米材料科学
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物理化学
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材料化学
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DOI
高影响因子
ACS Catalysis
·
2018
·
IF 11.384
Shengfeng Xue,Wentao Deng,Fang Yang,Jinlong Yang,Ibrahim Saana Amiinu,Daping He,Haolin Tang,Shichun Mu
A hexapod PtRuCu nanocrystalline alloy material is successfully fabricated by a facile approach based on Stranski–Krastanov growth and galvanic replacement and used as an efficient catalyst for direct methanol fuel cells (DFMCs). Because of the synergetic effect of metallic elements in the methanol oxidation, the activity and durability of the prepared PtRuCu/C catalyst is significantly enhanced. It has a mass activity of 1.35 A mgPt–1 and a specific activity of 3.92 mA cm–2, which are 3.8 and 8.2 times higher than those of Pt/C, respectively. Its mass activity only decreases 27% after 800 CV cycles compared with Pt/C (60% decline), indicating the admirable stability of the PtRuCu catalyst.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 43
·23169-23174
·
IF 5.968
Xianguang Ding,Yu Zou,Jiang Jiang
The synthesis of hybrid nanostructures has been of great interest to many material scientists, yet simple and facile routes to prepare these structures remain a difficult task with many reaction variables to tune. Herein, we report the synthesis of Au–Cu2S heterodimers from AuCu alloy nanoparticles by simply adding 1-dodecanethiol. Detailed characterization of this structural transformation process revealed that the crucial step of this synthetic approach was the alloy oxidization and subsequent formation of intermediate copper thiolate. Roles of surfactants and sulfur source have also been investigated. These observations provide critical insight into the understanding of the pathways of structure transitions from AuCu alloy to Au–Cu2S heterodimer nanoparticles, and will open up new ways of synthesizing heterodimer nanoparticles from metallic alloys.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2018
·Vol. 71
·期 7
·504-510
·
IF 1.059
Yanna Hu,Taiyang Liu,Chaozhong Li,Qiang Yuan,Yanna Hu,Taiyang Liu,Chaozhong Li,Qiang Yuan
Sponge-like metal nanomaterials have been paid great attention due to their unique structure for wide applications in hydrogen storage, filtration, sensors, heterogeneous catalysis, and fuel cells. Here, we first use a facile, bottom-up method to successfully prepare composition-tunable PtCu alloy nanosponges constructed with sub-4.5 nm particle building blocks. Due to the porous structure, structure defects, and synergetic effect of Pt and Cu, the PtCu alloy nanosponges exhibit good electrocatalytic performances towards methanol oxidation. Compared with pure Pt nanosponges, the specific/mass activity on PtCu2 alloy nanosponges is 5.84/2.93 times that on pure Pt nanosponges. Furthermore, the stability and reactivation ability of PtCu alloy nanosponges are also superior to pure Pt nanosponges.
研究领域:
材料科学
·
燃料电池技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 16
·2190-2200
·
IF 8.683
Chengguang Liu,Xiaolei Guo,Zhen-Feng Huang,Jinheng Li,Li Gan,Lun Pan,Chengxiang Shi,Xiangwen Zhang,Guidong Yang,Ji-Jun Zou
Due to the utilization of renewable energy and proton sources, the electrochemical nitrogen reduction reaction is considered as an efficient, sustainable, and carbon-neutral route to replace the industrial Haber–Bosch process. However, restricted by the highly competitive hydrogen evolution reaction and the highly inert NN bond, electrochemical nitrogen reduction research still faces significant challenges with a low level of selectivity and activity. Herein, we demonstrate a catalyst (PdCu/TiO2−x) composed of oxygen vacancy-rich TiO2−x nanosheets and PdCu alloy nanoparticles by the co-reduction method of metal precursors. Such a catalyst exhibits excellent electrocatalytic performance at room temperature and pressure, with an NH3 yield rate of 8.51 mmol gcat−1 h−1 and the corresponding faradaic efficiency of 49.09% at −0.1 V vs. the reversible hydrogen electrode, which are much higher than most reported palladium-based catalysts and their alloy catalysts. Characterization and experimental results confirm that by properly constructing the surface defect and nanoalloy structure, the optimized electronic structure and synergistic effect can not only effectively improve the N2 adsorption and activation, but also reduce the reaction barrier, resulting in efficient electrocatalytic performance. Meanwhile, the introduction of Cu accelerates the hydrogen desorption, further effectively improving the faradaic efficiency. Overall, we explored the electrocatalytic performance and mechanism of the bimetal alloy catalyst, as well as the optimization strategies for enhancing the nitrogen mass transfer process, providing new insight into the rational design of a highly efficient e-NRR system through tuning of the catalyst and reaction environment.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2023
·
IF 6.4
He Zhang,Xiao-Chun Deng,Guo-Hua Zhang
In this study, high performance W–Mo–Cu–Ni–Fe alloy samples with additions of Mo (0–6 wt%), Ni and Fe (total content: 2.5 wt% and 5 wt%) were obtained through liquid-phase sintering at lower temperature, with the raw material of ultrafine W–Mo–Cu–Ni–Fe composite powder. Ultrafine W–Mo–Cu–Ni–Fe alloy powder with strong sintering activity and uniform composition was obtained by two-stage reduction means composed of carbothermic pre-reduction and hydrogen deep deoxidation steps. Significantly, the bonding ability of W/Cu phase interface and the wettability of two phases are greatly improved due to the presences of Ni and Fe. Moreover, the addition of appropriate Mo content was advantageous to the formation of W–Mo solid solution . All alloy samples achieved higher densification degrees to guarantee that the sintered blocks possess outstanding overall performances. Especially, by adjusting Ni/Fe ratio, the highest tension strength and elongation of were achieved by W-2wt.%Mo-1.75 wt%Ni-0.75 wt%Fe-27.5 wt%Cu sintered block, which were 567 MPa and 10.37%, respectively. Moreover, owing to the presences of W–Mo and Cu–Ni–Fe solid solutions, this alloy also had the highest microhardness and bending strength of 446 HV and 1473 MPa, respectively. As increasing Mo content from 0 wt% to 6 wt%, the compression strength of sintered blocks was improved, and failure strains of all the sintered blocks are close to 100%, respectively. However, even though the Cu matrix network structure is more evenly distributed as a result of the existences of added Ni and Fe, the electronic movement ability of the sintered blocks was reduced, leading to a significant decrease in conductivity.
研究领域:
材料科学
·
冶金工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）