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Platinum clusters stabilized by zincosilicate zeolite for efficient propane dehydrogenation

Chinese Journal of Catalysis 2025年第4期71卷 208-219页

作者： Hao Liu Ying Zhang Liyang Liu Tianxiang Chen Xingcong Zhang Peng Hu Chao Xiong Jie Zhou Hao Zhang Lihui Dong Tsz Woon Benedict Lo Bing Nan Xiaohui He Hongbing Ji Key Laboratory of Bioinorganicand Synthetic Chemistry of Ministry of Education Fine Chemical Industry Research InstituteSchool of ChemistryIGCMESun Yat-sen UniversityGuangzhou 510275GuangdongChina Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical EngineeringGuangxi UniversityNanning 530004GuangxiChina Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteShanghai 200120China State Key Laboratory of Chemical Biology and Drug Discovery Department of Applied Biology and Chemical TechnologyThe Hong Kong Polytechnic UniversityHunghomHong KongChina State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology Institute of Green Petroleum Processing and Light Hydrocarbon ConversionCollege of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014ZhejiangChina Guangdong Technology Research Center for Synthesis and Separation of Thermosensitive Chemicals Guangzhou 510006GuangdongChina

Dispersing metals from nanoparticles to clusters is often achieved using ligand protection methods,which exhibit unique properties such as suppressing structure-sensitive side ***,this method is limited by the use of different metal precursor salts corresponding to different *** alternative approach,the ion exchange(IE)method,can overcome this limitation to some ***,there is still an urgent need to address the stabilization of metals(especially precious metals)by using IE ***,we reported a Pt cluster catalyst prepared mainly by anchoring Pt atoms via O located near the framework Zn in zincosilicate zeolites and riveted by zeolite surface rings after reduction(reduced Pt/Zn-3-IE).The catalyst can achieve an initial propane conversion of 26%in a pure propane atmosphere at 550℃and shows little deactivation even after 7.5 d of ***,the alteration of catalyst by the introduction of framework Zn was also highlighted and interpreted.

关键词： Zincosilicate zeolite Acid-site identification Rivet effect Pt clusters Propane dehydrogenation

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Effect of Cu and Mo Alloying on Microstructure and Molten Salt Corrosion Resistance of 347H Stainless Steel

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Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal materials and Engineering 2025年第4期54卷 862-870页

作者： Yu, Zhiqi Zhao, Yanchun Liu, Tianzeng Feng, Li Ma, Huwen Li, Jucang Pan, Jixiang State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China Gansu Jiu Steel Group Hongxing Iron & Steel Co. Ltd Jiayuguan735100 China

A static corrosion experiment of 347H stainless steel alloyed with elements Cu and Mo was carried out in a nitrate molten salt (60% NaNO3+40% KNO3) at 565 °C for 720 h. The effects of elements Cu and Mo on the corrosion resistance of 347H stainless steel in molten salt were investigated by analyzing the phase composition, microstructure and chemical composition of the corrosion products. The results show that the grain refinement induced by element Mo imparts the stainless steel with optimal corrosion resistance at a medium grain size. Furthermore, the formation of MoC significantly enhances the intergranular corrosion resistance of the stainless steel. The stainless steel exhibits uniform corrosion in the nitrate solution. The corrosion layer displays a dual-layer structure, and the corrosion products protecting matrix are present in both the inner and outer layers. The outer layer consists of a mixture of Fe oxides (Fe2O3, Fe3O4), NaFeO2, and a minor amount of MgFe2O4. Conversely, the inner layer is primarily composed of a spinel layer (FeCr2O4, MgCr2O4) and a thin Cu2O layer. The oxidation of Cu in the inner layer leads to the formation of a dense Cu2O layer, effectively impeding O2- plasma infiltration into the matrix. Copyright © 2025, Northwest Institute for Nonferrous Metal Research. Published by Science Press. All rights reserved.

关键词： Grain refinement

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Tunable broadband near-infrared luminescence of chromium with self-induced valence variation in Sr3In2Ge3O12

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Ceramics International 2025年

作者： Yang, Xiongfeng Fan, Xing He, Fangqian Zhang, Jianjie Tang, Chunhai Su, Liumei State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials School of Resources Environment and Materials Guangxi University Nanning530004 China School of Materials and Environment Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization Guangxi Colleges and Universities Key Laboratory of Eco-friendly Materials and Ecological Restoration Guangxi Minzu University Nanning530105 China

The demand for high-performance near-infrared (NIR) light-emitting materials has grown in recent years due to their great potential in numbers of technological fields, including non-destructive testing, optical telecommunications, and biological imaging. Herein, we present a novel Cr-activated NIR light-emitting garnet (Sr3In2Ge3O12) material with broadband dual-emission at NIR-I (860 nm, FWHM = 120 nm) and NIR-II (1480 nm, FWHM = 280 nm) regions under blue light excitation. Cr-doping results in the generation of multiple impurity levels within the band structure of Sr3In2Ge3O12, inducing a change in the host from an indirect to a direct band gap n-type semiconductor. Thanks to the multiple-sites occupancy of Cr ions in Sr3In2Ge3O12, the NIR dual-emission is verified to derive from the self-induced valence variation of Cr3+ and the intervalence energy transfer associated with Cr3+-Cr4+ aggregation. The large thermal activation energy and the weak electron-phonon coupling effect contribute to excellent thermal stability of the phosphor, with the emission intensities of Cr3+ and Cr4+ at 423 K maintaining 81.9 % and 86.3 % of that at room temperature. Moreover, the incorporation of Ca2+ into the Sr2+ lattice site enables the realization of tunable NIR emission in Sr3In2Ge3O12:Cr. The Sr3In2Ge3O12:Cr phosphor can be effectively utilized for the non-invasive detection of functional groups in a liquid medium. This work provides new insights into the design of broadband dual-emission light-emitting materials, which can be achieved by selecting an appropriate host to induce a valence variation in transition metal activators. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Phosphors

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Synergistic p-doping and interface passivation of P3HT by oxidized organic small molecules toward efficient and stable perovskite solar modules

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Journal of Energy Chemistry 2025年 108卷 477-484页

作者： Pin Lv Yuxi Zhang Wen Liang Tan Junye Pan Yanqing Zhu Jiahui Chen Bingxin Duan Peiran Hou Min Hu Christopher R. McNeill Jianfeng Lu Yi-Bing Cheng State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan 430070 Hubei China Department of Materials Science and Engineering Monash University Clayton Victoria 3800 Australia Australian Synchrotron Australian Nuclear Science and Technology Organization (ANSTO) Clayton Victoria 3168 Australia School of Electronic and Electrical Engineering Hubei Province Engineering Research Center for Intelligent Micro-Nano Medical Equipment and Key Technologies Wuhan Textile University Wuhan 430200 Hubei China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China

Poly(3-hexylthiophene) (P3HT) is one of the most promising hole-transporting materials in the pursuit of efficient and stable perovskite solar cells due to its outstanding stability and low cost. However, the intrinsic low carrier density of P3HT and poor contact between the P3HT/perovskite interface always lead to a low performance of the solar cell, while conventional chemical doping always makes the films unstable and limits the scalability. In this work, for the first time, we simultaneously enhanced the hole transporting properties of P3HT film and the interface of perovskite by doping it with a judiciously designed oxidized small molecule organic semiconductor. The organic salt not only can promote the lamellar crystallinity of P3HT to obtain better charge transport properties, but also reduce the defects of perovskite. As a result, we achieved champion efficiencies of 23.0% for small-area solar cells and 18.8% for larger-area modules (48.0 cm 2 ). This efficiency is the highest value for P3HT-based perovskite modules. Moreover, the solar cells show excellent operational stability, retaining over 95% of their initial efficiencies after 1200 h of continuous operation.

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Evolution in wear, corrosion, and tribocorrosion behavior of Ni-based alloys induced by Mn addition

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Wear 2025年

作者： Chen, Jia Lu, Wenlan Dai, Pinqiang Wen, Xiaochun Wang, Zhenjun Fan, Hengzhong Chen, Hongxiang Zhang, Yongsheng School of Materials Science and Engineering Fujian University of Technology Fuzhou350118 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Fujian Provincial Key Laboratory of Advanced Materials Processing and Application Fuzhou350118 China

Ni-based alloys have attracted much attention due to their exceptional mechanical and corrosion properties. The combination of these excellent properties has increased researchers’ interest in studying passivation mechanism during corrosion and tribocorrosion. In the present study, the effects of Mn addition (Mn = 0, 5, 10, and 20 at.%) on wear, corrosion, and tribocorrosion behavior of Ni-based alloys were investigated under room temperature. The microstructures of as-fabricated and post-test Ni alloys were characterized by X-ray diffraction and scanning electron microscopy. The elemental distribution and chemical states in worn and unworn areas were identified by using energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. The addition of Mn in the alloy was found to increase wear and tribocorrosion resistance. Pitting potential of Mn-free alloys was higher than that of Mn-containing alloys, reducing from 0.56 V to −0.05 V. Higher Mn concentration in the alloy offered a wear-induced corrosion during tribocorrosion process. In addition, substituting Cr with Mn content can promote the passivation of Ni, which was confirmed by X-ray photoelectron spectroscopy. Although Ni-Mn alloys does not passivate thermodynamically, passive layers can be found by transmission electron microscopy analysis due to the formation of metastable oxide phases. © 2025 Elsevier B.V.

关键词： X ray photoelectron spectroscopy

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Fast-charging dual-electrode-less battery enabled by a solution-to-solid conversion chemistry in molten salts

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Nano Energy 2025年 141卷

作者： Zhang, Meng Han, Kang Wang, Yu Zhang, Hao Tong, Xin Huang, Junling Wu, Xiaolin Guo, Changyuan Wang, Xuanpeng Meng, Jiashen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Department of Physical Science & Technology School of Physics and Mechanics Wuhan University of Technology Wuhan430070 China Hubei Xiangyang441000 China Co. Ltd High Technology Industrial Development Zone No. 60 Xuelan Road Henan Zhengzhou450001 China

Rechargeable aluminum batteries (RABs) have gained significant interest because of the low cost, abundant availability, and high capacity of aluminum metal (Al). To overcome excessive aluminum usage and slow solid-to-solid reaction rates in conversion-type cathodes, we present a fast-charging dual-electrode-less battery that utilizes solution-to-solid conversion chemistry at both electrodes within molten salt electrolytes. The activated carbon cloth (ACC) scaffolds, characterized by a high surface area, ample voids, and a strong structural framework, serve as current collectors on both the cathode and anode sides to facilitate their solution-deposition reactions. In symmetric cells, the ACC-based aluminum composite anode demonstrates lower overpotential, minimal dendrite formation, improved rate capability, and a longer cycling lifespan compared to a pure aluminum anode. Experimental results indicate a highly reversible solution-to-solid conversion reaction between soluble InCl and solid InCl3 on the cathode side, ensuring rapid solution-to-solid conversion kinetics and a self-healing structural property. The designed dual-electrode-less battery shows a low overpotential of 170 mV and a high discharge capacity of around 2 mAh cm−2 at 1 mA cm−2, fast-charging capability and good cycling stability with a capacity retention rate of 80 % after 350 cycles at a high charging rate of 10 mA cm−2. © 2025 Elsevier Ltd

关键词： Salts

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Defect recognition of circumferential welds of pipelines in TOFD images based on YOLOv5

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Hanjie Xuebao/Transactions of the China Welding Institution 2025年第4期46卷 22-31页

作者： Xu, Cheng Dong, Shihao Ou, Zhengyu Han, Zandong State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Department of Mechanical Engineering Tsinghua University Beijing100084 China Training Base of Army Engineering University Xuzhou221004 China

In order to enhance defect recognition in time-of-flight diffraction (TOFD) scan images for circumferential welds of pipelines under conditions such as background signal interference and uneven sample distribution, an improved YOLOv5s network model was proposed. In view of the defects with irregular shapes in TOFD images for circumferential welds of pipelines, deformable convolutions were introduced, enabling the network to adapt to the shape characteristics of defects and improving the feature extraction capability for irregular defects in TOFD images. To study the influence of interference waveforms such as direct wave and bottom wave on defect recognition in TOFD images, self-attention mechanisms were incorporated at different depths of the network, guiding the network to focus on subtle defect features while effectively suppressing the impact of interface waves on defect recognition. Furthermore, to tackle the issue of class imbalance in real-world defect samples, the SlideLoss loss function was employed to replace the original loss function, thereby enhancing the recognition accuracy for crack-type defects with limited sample sizes. Comparative experiments demonstrate that the improved network effectively suppresses complex background interference in TOFD images and improves defect recognition efficiency under imbalanced sample conditions. Compared to those of the original network, the overall mean average precision (mAP) and the average precision (AP) for crack-type defects have increased by 8.2% and 7.3%, respectively. © 2025 Harbin Research Institute of Welding. All rights reserved.

关键词： Image enhancement

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Effect of Y2O3-Al2O3 sintering additive content on the properties of porous Si3N4 ceramics prepared by digital light processing using Polymethyl methacrylate as pore-forming agent

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Ceramics International 2025年

作者： Wu, Ya-Ru Huang, Hai-Lu Tian, Chong Wu, Jia-Min Liu, Chun-Lei Guo, Lin Cai, Wei-Hao Yang, Ling-Hao Liu, Zhi-Wei Zhang, Yang-Ze Luo, Zhi-Cong Su, Sen Shi, Yu-Sheng State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of Education Wuhan430074 China Wenzhou Key Laboratory of Microwave Communication Materials and Devices Wenzhou Advanced Manufacturing Institute of HUST Wenzhou325035 China

Porous Si3N4 ceramics have been widely used in aerospace and military industry due to their excellent mechanical properties. Digital light processing (DLP) technology offers an effective route to prepare porous Si3N4 ceramics. In this paper, porous Si3N4 ceramics were successfully fabricated by DLP technology using Polymethyl methacrylate (PMMA) as pore-forming agent, and the effects of the sintering additive (Y2O3-Al2O3) content on the properties of Si3N4 ceramic slurry, green bodies and sintered parts were systematically studied. With the increase of sintering additive content from 2 wt% to 14 wt%, the viscosity of the Si3N4 slurry decreased and the cure depth of that increased. It was found that Y2O3 in sintering additives could induce the growth of β-Si3N4 grain and the fracture mode of Si3N4 ceramics changed from transgranular fracture to intergranular fracture gradually. Additionally, the porosity of porous Si3N4 ceramics first decreased and then increased, while the bulk density, flexural strength of the sintered samples first increased and then decreased with the increase of the sintering additive content. When the content of Y2O3-Al2O3 sintering additives was 10 wt%, the flexural strength of the Si3N4 ceramics reached the maximum value of 459.38 MPa. This research is of great significance for the mechanical property improvement of porous Si3N4 ceramics prepared by DLP. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Machinability

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Interaction of the Initial β-Mg17Al12 Phase with α-Matrix Grains in the AZ91 Magnesium Alloy During Hot Extrusion

SSRN

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SSRN 2025年

作者： Zhao, Dijia Shao, Yuman Lü, Shulin Yan, Zhaoxiang Guo, Wenbo Li, Shilong Li, Jianyu Xu, Shiwei Wu, Shusen Nie, Jianfeng State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Department of Materials Science and Engineering Monash University VIC3800 Australia

Secondary phase particles in magnesium alloys can facilitate particle-stimulated nucleation and pinning the grain boundary migration during the dynamic recrystallization (DRX) process. But a conflict exists between these two effects. By optimizing the hot extrusion process and preserving the irregular island-shaped β-Mg17Al12 phase (β-phase) derived from the eutectic reaction in the AZ91 magnesium alloy billet, we revealed the interaction of the initial β-phase with the α-matrix during extrusion. In the early stages of extrusion, the irregular, island-shaped, coarse β-phase causes significant dislocation accumulation in the adjacent α-matrix due to the hardness difference. As dislocations accumulate, the β-phase fragments and transforms into spindly fibrous bands, effectively illustrating a pinning effect. The morphological change of the β-phase not only promotes the DRX process but also inhibits the growth of DRXed grains, thereby refining the grain size. This research helps to expand the design strategies for extruded magnesium alloys. © 2025, The Authors. All rights reserved.

关键词： Magnesium alloys

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Long lifespan Li-Se battery: Advances, challenges and prospects

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Journal of Energy Chemistry 2025年 102卷 712-733页

作者： Hongyan Li Thomas L. Madanu Tarek Barakat Wen-Da Dong Alexandru Vlad Xikun Zhang Cheng-Bin Jin Yu Li Bao-Lian Su College of Materials and Chemistry China Jiliang University Hangzhou 310018 Zhejiang China Laboratory of Inorganic Materials Chemistry (CMI) Namur Institute of Structured Matter (NISM) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430074 Hubei China Institute of Condensed Matter and Nanosciences Molecular Chemistry Materials and Catalysis Université catholique de Louvain Louvain-la-Neuve Belgium

Lithium-selenium (Li-Se) batteries have attracted increasing attention as one of the next-generation battery systems due to much higher electronic conductivity and comparable volumetric capacity of Se compared to the popular sulfur cathode. However, its practical application still faces great challenges, especially the rapid capacity decay triggered by the loss of active Se species. A comprehensive review to uncover the in-depth failure mechanism and provide targeted solutions to promote the stable operation of Li-Se batteries is urgently needed. This review systematically summarizes the strategies in the new perspective, focusing on the optimization of Se utilization in Li-Se batteries by keeping a high Se maintenance in the cathode and accelerating the electrochemical kinetics of lithium polyselenides (LiPSe) conversion. On the basis of structural design and Li 2 Se active material introduction to accommodate volume expansion, blocking shuttle transport of LiPSe by physical/chemical adsorption, bonding Se with polymers or cathode electrolyte interphase (CEI) construction, and catalytic design to accelerate the conversion of LiPSe, different strategies for improving the utilization of Se have been evaluated and discussed. To address the inevitable loss of Se, prospects on inactive Se reactivation and Li protection are detailedly proposed and analyzed referring to the chemistry and corrosion science. Additionally, the perspectives on the future design and comprehensive parameter evaluations for the optimization of Li-Se batteries are recommended. This review comprehensively explains the causes and solutions of capacity fading and provides potential efforts for lifespan expansion of batteries, shedding light on the future development of Li-Se batteries.

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