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Synergistic effects of acid-base and electronic properties upon second metals-modified Ga 2 O 3 /Silicalite-1 catalysts for efficient CO 2 -assisted propane dehydrogenation

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Surfaces and Interfaces 2025年 70卷

作者： Fang Wang Jiulong Wang Yongchang Sun Jie Jian Zelin Ma Yazhou Shuang Weihao Zhao Shiyuan Wang Pengfei Guo Zhenhong He Hongqiang Wang Center for Nano Energy Materials State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Xi’an Shaanxi 710072 PR China College of Chemistry and Chemical Engineering Shaanxi University of Science & Technology Xi’an 710021 China

Ga-based catalysts exhibit significant potential in activating C H bonds and enhancing the catalytic efficiency during CO 2 -assisted propane dehydrogenation (CO 2 -ODP). However, achieving high C 3 H 6 selectivity remains challenging due to severe side reactions caused by their strong acid strength. In this work, second metal promoters (Cu, Co, Zn, Sn and Fe) are incorporated into Ga 2 O 3 /Silicalite-1 catalysts, respectively, effectively enhancing the interaction between Ga species and S-1 support by facilitating the electron transport, thereby improving the dispersity of Ga 2 O 3 sites. Notably, the introduction of Cu into Ga 2 O 3 /S-1 catalyst (7Ga 2 O 3 -0.5Cu/S-1) not only modulates the acid-base balance to promote C 3 H 6 desorption, but also enhances CO 2 activation by generating more strongly basic sites. As a result, the 7Ga 2 O 3 -0.5Cu/S-1 catalyst achieves initial C 3 H 6 yield and CO 2 conversion of 52.7 % and 29.7 %, respectively, maintaining at 37.7 % and 19.7 % after 8 h of catalysis. These results surpass most reported Ga-based catalysts and even non-precious-metal-based catalysts over the past five years. The second metal modification strategy provides valuable insights into the synergistic modulation of acid-base balance and electronic interactions.

关键词： Acid-base balance CO2-assisted propane dehydrogenation Electronic interactions Ga2O3 Silicalite-1

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Nickel carrier transfer bridge for improved photocatalytic water splitting of Zn 2 GeO 4

Transactions of Materials Research

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Transactions of materials Research 2025年第1期1卷

作者： Ruiqing Zou Sibi Liu Jie Su Weiheng Ding Yijin Wang Fei Yan Peng Guo Junchao Zhou Youzi Zhang Xuanhua Li State Key Laboratory of Solidification Processing Center for Nano Energy Materials School of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 China Research and Development Institute of Northwestern Polytechnical University Shenzhen 518057 China State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Shaanxi Joint Key Laboratory of Graphene School of Microelectronics Xidian University Xi'an 710071 China

Photocatalytic water splitting can convert solar energy into hydrogen, which has important implications for reducing dependence on fossil fuels. Constructing heterojunctions is a universal method for facilitating charge transfer, but the poor interface matching limits its charge separation and photocatalytic activity. Here, a metal-nickel bridging (nickel interlayer) NiO-Ni-Zn 2 GeO 4 photocatalyst with well interface matching is designed through a partial oxidation strategy. Structure and in situ Raman characterization demonstrate that the nickel interlayer substantially optimizes interface matching and causes the first-order phonon mode transfer from the first-order longitudinal wave to the first-order transverse wave, which implies that NiO acts as the site for hydrogen production and violent surface reaction. Therefore, the nickel interlayer provides a charge transfer channel for carrier separation. Meanwhile, density functional theory calculations prove an optimal hydrogen-oxygen bond-breaking process with 36 % barriers decrease obtained via the effect of nickel interlayer. As a result, NiO-Ni-Zn 2 GeO 4 shows the photocatalytic hydrogen production rate of 206.6 μmol g −1 h −1 , which is over 8 times greater than that of Zn 2 GeO 4 . This study offers a new approach for designing heterojunctions with well-matched interface and efficient charge separation.

关键词： Photocatalytic hydrogen evolution Zn 2 GeO 4 Metal-nickel bridging Charge separation Interface matching

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Plastic deformation mechanism of high manganese steel via laser laminated object manufacturing

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Journal of materials processing technology 2025年

作者： Haifeng Yang Jiafu Pei Mingtian Shi Huafeng Guo Haiyu Liu Enlan Zhao Jingbin Hao Hao Liu Hao Yi School of Mechanical and Electrical Engineering China University of Mining and Technology Xuzhou Jiangsu 221116 China Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment China University of Mining and Technology Xuzhou Jiangsu 221116 China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University Xi'an Shaanxi 710072 China School of Mechanical and Electrical Engineering Xuzhou University of Technology Xuzhou Jiangsu 221018 China State Key Laboratory of Mechanical Transmission for Advanced Equipment Chongqing University Chongqing 400044 China

To solve the trade-off between product quality and cost, a novel metal additive manufacturing (AM) process is proposed, namely, laser-laminated object manufacturing (LLOM), which combines laminated object manufacturing with laser AM. The unique molten-pool shape, material-supply method, and heat-conduction pathway endows LLOM with the capability to produce flatter surfaces in each layer and finer microstructures, which improve the product quality and reduce manufacturing costs. High manganese steel prepared via LLOM (LLOM-HMS) demonstrates excellent and stable work hardening performance and synergistically improved strength and plasticity. Deep analysis of the tensile process of LLOM-HMS reveals that the texture, dominant deformation factor, and flow-stress strengthening contributions of the sample change many times because of the grain rotation and twinning with the increase in strain, and evolution models for these are established. The novel LLOM proposed in this work can balance the cost and quality in metal AM. The mechanical mechanisms are found to be directly related to the microstructure, which provides a new perspective for studying the properties of AM metal products.

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Revealing the Crucial Roles of Pore Interconnectivity between Zeolitic and Nonzeolitic Components in Enhancing Diffusion and Catalytic Efficiency of Industrial Zeolite-Based Catalysts

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Journal of the American Chemical Society 2025年第22期147卷 2025 May 26页

作者： Yipu Xu Peng Peng Hanlixin Wang Hao Xiong Zhaochao Xu Xiao Chen Yanpeng Li Anmin Zheng Yingxu Wei Zifeng Yan Shutao Xu Zhongmin Liu State Key Laboratory of Heavy Oil Processing School of Chemistry and Chemical Engineering China University of Petroleum (East China) Qingdao 266580 P. R. China. National Engineering Research Center of Lower-Carbon Catalysis Technology Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China. Interdisciplinary Institute of NMR and Molecular Sciences Hubei Province for Coal Conversion and New Carbon Materials School of Chemistry and Chemical Engineering Wuhan University of Science and Technology Wuhan 430081 P. R. China. CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China. University of Chinese Academy of Sciences Beijing 100049 P. R. China. Engineering and Technology Department of Chemical Engineering Tsinghua University Beijing 100084 P. R. China. State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China.

One of the utmost targets for catalysis research is to meet social needs in a profitable manner. Zeolitic and "nonzeolitic components" (such as silica, alumina, amorphous aluminosilicate, clay, etc.), as indispensable constituents of an industrial catalyst, both actively participate in industrial processes like polyolefin catalytic cracking and residue fluid catalytic cracking. Yet, the main research activities focus mainly on the diffusion behaviors of a single zeolitic or nonzeolitic component. In this work, the pore interconnectivity between zeolitic and nonzeolitic components to better ensure the diffusion and migration of reaction intermediate products in between was systematically studied by adopting a series of ZSM-5@meso-SiO core-shell mesostructures as models to mimic industrially applied multicomponent zeolite-based catalysts with varying pore interconnectivities between the zeolitic (ZSM-5) and nonzeolitic components (meso-SiO). Their distinctive differences in the multiscale diffusion behaviors and structure-performance relationships represent the following three summarized scenarios: (1) micro/mesopore orientation, (2) spatial distribution of components, and (3) micro/mesoporous relative pore sizes thereof. These reveal that a well-connected micro/mesopore network can effectively accelerate interfacial diffusion and fully enhance the catalytic efficiency of the zeolitic component, highlighting the foundational functions of pore interconnectivity between zeolitic and nonzeolitic components in terms of the significance of the free migration of reactant species in between.

关键词： Reaction intermediates

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Passivating Lithiated Graphite via Targeted Repair of SEI to Inhibit Exothermic Reactions in Early-Stage of Thermal Runaway for Safer Lithium-Ion Batteries

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Angewandte Chemie 2023年第10期135卷

作者： Yuanke Wu Ziqi Zeng Sheng Lei Mengchuang Liu Wei Zhong Mingsheng Qin Prof. Shijie Cheng Prof. Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 China

The self-exothermic in early stage of thermal runaway (TR) is blasting-fuse for Li-ion battery safety issues. The exothermic reaction between lithiated graphite (LiC x ) and electrolyte accounts for onset of this behavior. However, preventing the deleterious reaction still encounters hurdles. Here, we manage to inhibit this reaction by passivating LiC x in real time via targeted repair of SEI. It is shown that 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane (D 3 F) can be triggered by LiC x to undergo ring-opening polymerization at elevated temperature, so as to targeted repair of fractured SEI. Due to the high thermal stability of polymerized D 3 F, exothermic reaction between LiC x and electrolyte is inhibited. As a result, the self-exothermic and TR trigger temperatures of pouch cell are increased from 159.6 and 194.2 °C to 300.5 and 329.7 °C. This work opens up a new avenue for designing functional additives to block initial exothermal reaction and inhibit TR in early stage.

关键词： Flame-Retardant Lithium-Ion Batteries Ring-Opening Polymerization Targeted Repairing Thermal Runaway

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Interfacial component coupling effects induce electron redistribution for enhanced hydrazine-assisted hydrogen production at ampere-level current densities

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Nano Energy 2025年 142卷

作者： Xinru Zhao Hongshun Zheng Huachuan Sun Mingpeng Chen Boxue Wang Qingjie Lu Bin Xiao Tong Zhou Dequan Li Guoyang Qiu Jin Zhang Yumin Zhang Feng Liu Tianwei He Hui Pan Chundong Wang Qingju Liu Yunnan Key Laboratory for Micro/Nano Materials & Technology National Center for International Research on Photoelectric and Energy Materials School of Materials and Energy Yunnan University Kunming 650091 PR China Yunnan Precious Metals Laboratory Co. Ltd. Kunming 650106 PR China Institute of Applied Physics and Materials Engineering (IAPME) University of Macau Taipa 999078 Macao School of Integrated Circuits State Key Laboratory of New Textile Materials and Advanced Processing Huazhong University of Science and Technology Wuhan 430074 PR China

Hydrazine-assisted hydrogen production promises to boost water electrolysis with low energy consumption. Herein, a silver willow flower-like heterostructure is constructed by coupling Pt nanoparticles with NiMoO 4 nanowires that are annealed under nitrogen (N 2 ) conduction (Pt@NMO-N 2 ). Comprehensive electronic structure characterization and theoretical calculations reveal that the built-in electric field (BEF) significantly promotes the transfer of electrons from the oxygen vacancy-rich carrier (NMO-N 2 ) to the Pt sites, thereby accelerating the adsorption and desorption of H-intermediates during the hydrogen evolution reaction (HER) process. Meanwhile, the interfacial component coupling effects and oxygen vacancies result in the d-band center (ε d ) shift down to promote the dehydrogenation process from *NH 4 to *NH 3 in the hydrazine oxidation reaction (HzOR). Additionally, the Pt@NMO-N 2 exhibits super-hydrophilicity and superaerophobic properties, which synergistically enhance mass transfer. Impressively, the Pt@NMO-N 2 exhibits low overpotentials of 149 and 180 mV at 1000 mA cm –2 for the HER in alkaline freshwater and seawater, respectively, and it only requires a work potential of 121 mV to achieve 1000 mA cm –2 for the HzOR. Notably, the Pt@NMO-N 2 (+) || Pt@NMO-N 2 (−) electrolyzer operates at a low voltage of 0.32 V to reach 500 mA cm –2 for the hydrazine-assisted water splitting. Furthermore, the self-supported Pt@NMO-N 2 catalyst, employed as the cathode in an anion exchange membrane (AEM) electrolyzer, requires only 1.77 V to achieve 500 mA cm⁻² at T  = 60 ℃. This work opens avenues for future research on advanced heterostructures in sustainable energy applications.

关键词： Diffusion in liquids

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Coherent and compact zinc electrodeposition enabled by compressing the electric double layer of the deposits

Research Square

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Research Square 2021年

作者： Zhao, Ruirui Wang, Haifeng Du, Haoran Yang, Ying Gao, Zhonghui Qie, Long Huang, Yunhui Institute of New Energy for Vehicles School of Materials Science and Engineering Tongji University Shanghai201804 China State Key Laboratory of Material Processing and Die & Mold Technology School of Materials Science and Engineering Huazhong University of Science and Technology Hubei Province Wuhan430074 China

The porous hexagonal-platelet Zinc (Zn) deposits exacerbate the chemical corrosion and deteriorate the reversibility of the Zn electrodes in aqueous electrolytes. Based on the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, to turn the messy Zn deposits into agglomerate ones, the challenge is to weaken the electric double layer repulsive force, which is the main reason preventing the dense Zn deposits, between the electrodeposited Zn particles. Here, we proposed a strategy to compress the electric double layer and regulate the forces between the electrodeposited Zn particles by introducing inert charges to the surface of the Zn deposits. The results of the electron microscopies revealed dense and coherent electrodeposition of Zn, indicating that the van der Waals attraction between the deposits becomes governing during electrodeposition. Such results could be attributed to the adsorbed inert charges on Zn deposits decrease the net charges and weaken the electric double layer repulsive force. This design enables the Zn||Zn cells a long-term plating/stripping stability for > 1200 h, a high average Coulombic Efficiency of 99.9% for > 2100 h, and steady charge/discharge responses even under a draconian deep-discharge condition of 80% depth of discharge of Zn (DODZn). In addition, the Zn||VS2 full cells demonstrate significantly improved electrochemical reversibility and capacity retention. © 2021, CC BY.

关键词： Deposits

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Buckling behavior of AA6061 circular tube under axial compression by considering contact condition of tube end

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International Journal of Lightweight materials and Manufacture 2021年第3期4卷 383-392页

作者： Zhi-chao Sun Jing Cao Long Huang Zhi-kun Yin Li-shuang Zheng State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University P.O. Box 542 Xi'an Shaanxi 710072 PR China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment School of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 PR China School of Mechanical Engineering Henan Institute of Technology Xinxiang Henan 453003 PR China

When a circular tube is under axial compression, it can be developed into specific forming technologies (e.g., tube inversion). However buckling failure is prone to occurring and seriously restricts the successful realization of the forming process or service performance. In this paper the conical convex or concave dies with different semi-cone angles were adopted to change tube end contact conditions and the buckling process, critical buckling force and the buckling waves of AA6061 tube under axial compression were investigated by using finite element simulation combined with experiments. The results show that the buckling deformation, the position where initial buckling wave appears, and the distribution of axial stress in tube blank are quite different when axially compressed on a flat die or a conical convex die (semi-cone angle β = 60°). For the conical convex dies as semi-cone angle increases from 75° to 87.5°, or for concave dies as semi-cone angle decreases from 110° to 92.5°, the axial compressive stress, critical buckling force and critical reduction increase, while the peak of the buckled wave decreases, i.e., occurrence of buckling delays and the buckling becomes more difficult to occur. When β is 90° (flat die), the critical buckling force and reduction reach the peak values.

关键词： AA6061 tube Conical die Axial compression Buckling failure Contact condition

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Temperature- and Stress-Dependent Electromechanical Properties of Phase Boundary Engineered (K,Na)Nbo3-Based Lead-Free Piezoceramics

SSRN

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SSRN 2022年

作者： Gadelmawla, Ahmed Eckstein, Udo Riess, Kevin Liu, Yi-Xuan Wang, Ke Li, Jing-Feng Kakimoto, Ken-Ichi Khansur, Neamul H. Webber, Kyle G. Department of Materials Science and Engineering Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen Germany State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Department of Life Science and Applied Chemistry Graduate School of Engineering Nagoya Institute of Technology Nagoya466–8555 Japan Frontier Research Institute for Materials Science Nagoya Institute of Technology Nagoya466–8555 Japan

The influence of stress on the small-signal dielectric permittivity and piezoelectric coefficient of polycrystalline lead-free perovskite 0.92(Na1/2K1/2)NbO3-(0.08−x)Bi1/2Li1/2TiO3-xBaZrO3 (x = 0, 0.02, 0.04, 0.06, and 0.07) was characterized under different constant uniaxial stress up to −200 MPa within a temperature range of −150 °C to 450 °C, revealing stress-induced suppression of the electromechanical response as well as shifts in the phase boundaries. For all compositions, the interferroelectric and ferroelectric-paraelectric phase transitions were shifted to higher temperatures under the uniaxial compressive stress. Interestingly, the sensitivity to the applied stress was found to increase with increasing BZ/BLT ratio in the system. The origin of different extent of stress-sensitivity with BZ/BLT ratio is suggested to be related to the change in the crystal structure. Additionally, at temperatures below −50 °C, the relative permittivity showed a significant increase under applied compressive stress. © 2022, The Authors. All rights reserved.

关键词： Compressive stress

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Smart photonic wristband for pulse wave monitoring

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Opto-Electronic Science 2024年第12期3卷 12-27页

作者： Renfei Kuang Zhuo Wang Lin Ma Heng Wang Qingming Chen Arnaldo Leal Junior Santosh Kumar Xiaoli Li Carlos Marques Rui Min Center for Cognition and Neuroergonomics State Key Laboratory of Cognitive Neuroscience and LearningBeijing Normal UniversityZhuhai 519087China College of Science Shenyang Aerospace UniversityShenyang 110136China School of Microelectronics Science and Technology Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and SystemsSun Yat-Sen UniversityZhuhai 519082China Graduate Program in Electrical Engineering Federal University of Espírito SantoFernando Ferrari AvenueVitoria 29075-910Brazil Department of Electronics and Communication Engineering Koneru Lakshmaiah Education FoundationVaddeswaramAndhra Pradesh 522302India CICECO-Aveiro Institute of Materials Physics DepartmentUniversity of AveiroAveiro 3810-193Portugal

Real-time acquisition of human pulse signals in daily life is clinically important for cardiovascular disease monitoring and ***,we propose a smart photonic wristband for pulse signal monitoring based on speckle pattern analysis with a polymer optical fiber(POF)integrated into a sports *** different speckle pattern processing algorithms and POFs with different core diameters were *** results indicated that the smart photonic wristband had a high signal-to-noise ratio and low latency,with the measurement error controlled at approximately 3.7%.This optimized pulse signal could be used for further medical diagnosis and was capable of objectively monitoring subtle pulse signal changes,such as the pulse waveform at different positions of Cunkou and pulse waveforms before and after *** the assistance of artificial intelligence(AI),functions such as gesture recognition have been realized through the established prediction model by processing pulse signals,in which the recognition accuracy reaches 95%.Our AI-assisted smart photonic wristband has potential applications for clinical treatment of cardiovascular diseases and home monitoring,paving the way for medical Internet of Things-enabled smart systems.

关键词： smart healthcare specklegram pulse monitoring gesture recognition artificial intelligence wearable sensor

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