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Hydrogen Spillover Induced PtCo/CoOx Interfaces with Enhanced Catalytic Activity for CO Oxidation at Low Temperatures in Humid Conditions

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Small 2024年第22期20卷 2309181-2309181页

作者： Lin, Jiajin Zhao, Shuaiqi Yang, Jin Huang, Wei-Hsiang Chen, Chi-Liang Chen, Tingyu Zhao, Yun Chen, Guangxu Qiu, Yongcai Gu, Lin School of Environment and Energy State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control South China University of Technology Guangzhou510000 China School of Chemistry and Chemical Engineering Wuhan Textile University Wuhan430200 China National Synchrotron Radiation Research Center Hsinchu30076 Taiwan Hsinchu30076 Taiwan Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and Devices Laboratory of Advanced Materials and Electron Microscopy Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China

The development of catalysts with abundant active interfaces for superior low-temperature catalytic CO oxidation is critical to meet increasingly rigorous emission requirements, yet still challenging. Herein, this work reports a PtCo/CoOx/Al2O3 catalyst with PtCo clusters and enriched Pt─O─Co interfaces induced by hydrogen spillover from the Pt sites and self-oxidation process in air, exhibiting excellent performance for CO oxidation at low temperatures and humid conditions. The combination of structural characterizations and in situ Fourier transform infrared spectroscopy reveals that the PtCo cluster effectively prevents CO saturation/poisoning on the Pt surface. Additionally, the presence of Pt─O─Co interfaces in the PtCo/CoOx/Al2O3 catalyst provides a significant number of active sites for oxygen activation and ─OH formation. This facilitates efficient generation of CO2 at ambient temperature by coupling with nearby adsorbed CO molecules, resulting in superior low-temperature activity and long-term stability for CO oxidation under humid conditions. This work provides a facile route toward rationalizing the design of catalysts with more active interfaces for superior low-temperature CO oxidation under humid conditions for practical applications. © 2023 Wiley-VCH GmbH.

关键词： Binary alloys

Controlling Aluminum Oxidation in Cuinal Precursor Films: Significance for Achieving High-Performance Cu(Inal)Se2 Solar Cells

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SSRN 2023年

作者： Han, Junsu Zhao, Ming Zhuang, Daming Wang, Hanpeng Tong, Hao Tao, Shengye Dong, Liangzheng Jia, Mengyao Wang, Yafei School of Materials Science and Engineering Tsinghua University Beijing100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Laboratory for New Ceramics and Fine Processing Tsinghua University Beijing100084 China College of Mechanical and Vehicle Engineering Taiyuan University of Technology Taiyuan030024 China

In this work, we demonstrate the effects of aluminum and aluminum oxide within CuInAl precursor films on the formation process of Cu(InAl)Se2 (CIASe) thin films. We carried out a large number of experiments to optimize the conditions for obtaining CIASe thin films with excellent adhesion and electrical properties. Our findings suggest that the fabrication conditions of the precursor films, such as the vacuum level of sputtering chamber and the structure of the precursor films, significantly affect to the growth of the CIASe layer during selenization annealing. Through a series of experiments, we successfully obtained a 2.4 μm-thick CIAS thin film with strong adhesion to the Mo-coated substrate and fabricated a CIASe solar cell with an efficiency of 7.7%. Our study demonstrates the great potential of the two-step fabrication approach for CIASe thin film production, and further improvements are expected by optimizing the fabrication conditions. © 2023, The Authors. All rights reserved.

关键词： Thin films

Broadband achromatic metalens design based on artificial neural network

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Broadband achromatic metalens design based on artificial neu...

CLEO: QELS_Fundamental Science, QELS 2022

作者： Wang, Feilou Geng, Guangzhou Wang, Xueqian Li, Junjie Bai, Yang Li, Jianqiang Wen, Yongzheng Li, Bo Sun, Jingbo Zhou, Ji State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China CAS Key Laboratory of Green Process and Engineering National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Tsinghua Shenzhen International Graduate School Shenzhen518055 China

We used the backpropagation neural network to design a high performance achromatic metalens at visible range. Experimental demonstration showed that the fabricated achromatic metalens can operate from 420 to 640 nm wi... 详细信息

ISBN: (纸本)9781557528209

关键词： Neural networks

Construction of a Sustainably No-Releasing Rgdc Grafted Chitosan Oriented Peripheral Nerve Scaffold

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SSRN 2025年

作者： Zhao, Wenxuan Chen, Yuzhe Wu, Xiaopei Dong, Xianzheng Dai, Honglian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City Zhongshan528400 China State Key Laboratory of New Textile Materials and Advanced Processing Wuhan Textile University Wuhan430200 China

Peripheral nerve regeneration is impeded by an imbalanced microenvironment involving inflammation, oxidative stress, and inadequate vascularization. Traditional drug therapies are limited by poor blood-nerve barrier penetration and lack of multifunctional efficacy. Nitric oxide (NO), a critical gasotransmitter, promotes nerve repair by enhancing axonal growth, synaptic plasticity, and cell survival, while exerting anti-inflammatory, antioxidant, and pro-angiogenic effects. However, uncontrolled NO release risks cytotoxicity. To address this, we engineered a multifunctional hydrogel by grafting RGDC peptides onto chitosan to create an oriented microstructure, incorporating glutathione as a precursor for S-nitrosoglutathione (GSNO), a sustained NO donor. This design combines structural guidance with controlled NO delivery and antioxidant activity. The hydrogel demonstrated excellent biocompatibility and sustained NO release, avoiding cytotoxic levels. The RGDC peptide enhanced cell adhesion and migration, while GSNO effectively reduced intracellular reactive oxygen species (ROS) and promoted human umbilical vein endothelial cell (HUVEC) angiogenesis. The integrated system synergistically modulates the regenerative microenvironment by mitigating oxidative stress, supporting vascularization, and guiding cellular behavior. This strategy overcomes limitations of conventional treatments by combining structural alignment, controlled gasotransmitter release, and multifunctional bioactivity, offering a promising translational solution for peripheral nerve repair. © 2025, The Authors. All rights reserved.

关键词： Scaffolds

Voltage Prediction and Extrapolation in Complex Pem Fuel Cell Conditions Via Transfer Learning from Localized Data

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SSRN 2024年

作者： Zhu, Wenchao He, Tingwei Wu, Hangyu Yang, Yang Wei, Peng Xie, Changjun Xiong, Rui State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Automation Wuhan University of Technology Wuhan430070 China Wuhan Industrial Technology Institute of Artificial Intelligence and New Energy Vehicles Wuhan430119 China Joint Laboratory for Advanced Energy Storage and Application School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China

Transfer learning effectively leverages knowledge from source tasks to mitigate the reliance on large datasets in data-driven fuel cell health state prediction methods. However, in practical applications, the significant variation in degradation data distribution across different fuel cell types and operating conditions hinders knowledge transfer between source and target domains. Moreover, the complex and variable operating conditions of PEMFCs pose additional challenges to accurate prediction and diagnosis. Accurately characterizing future fuel cell stacks degradation characteristics under complex conditions using limited data from specific operating conditions is crucial for effective fuel cell health monitoring. A TCN-GRU-based transfer learning architecture is proposed to enable the transfer of knowledge from quasi-dynamic data to dynamic conditions. This approach reduces time costs by 41.56% and increases accuracy by 48.29%. Its generalization capability is thoroughly demonstrated across nine current levels in the activation and ohmic regions. Additionally, a voltage extrapolation method using Deep MMD is proposed. Based on limited data from specific operating conditions in the activation and ohmic regions, the proposed transfer learning method reconstructs voltage for future potential operating conditions, enabling precise characterization of fuel cell voltage degradation trends under unknown conditions, providing comprehensive insights for fuel cell operation. © 2024, The Authors. All rights reserved.

关键词： Extrapolation

Study on Cold-Sprayed Fe-Based Metallic Glass Reinforced Cu Composite Coating Applied To 6061 T6 Al Alloy Base Material

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SSRN 2025年

作者： Xue, Na Zhao, Huaqi Li, Guojing Li, Weiwei Chen, Yingwei Zhang, Jitang Zhiqiu, Huang Zhu, Liu Shao, Ling Jiamusi University Jiamusi154007 China Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou University Taizhou318000 China Zhejiang Key Laboratory for Island Green Energy and New Materials Taizhou University Taizhou318000 China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal Lanzhou University of Technology Lanzhou730050 China Zhejiang University China

This study investigated the effectiveness of Fe-based metallic glass particles as a reinforcing agent in Cu-based composite coating fabricated by cold spray technology. The cold spray process was conducted under parameters of 600 °C and 5 MPa. The influence of Fe-based metallic glass content on coating thickness, microstructure, porosity, hardness and shear strength was systematically studied. The coating thickness, microstructure and porosity were analyzed by scanning electron microscopy. The coating microhardness was measured by microhardness tester, and shear strength of the coating was assessed using the ear shear test. The results reveal that the addition of Fe-based metallic glass particles significantly affected the performance of the coating. As the mass fraction of Fe-based metallic glass particles rose, the coating thickness and porosity decreased, while microhardness and shear strength increased. Specifically, at a 35% Fe-based metallic glass content, the coating thickness decreased sharply from 355.1 ± 12.2 μm (pure Cu) to 152.8 ± 10.7 μm, while porosity reduced from 0.58 ± 0.02% to 0.14 ± 0.01%. The microhardness increased from 157.1 ± 1.7 HV (pure Cu) to 177.4 ± 1.1 HV, and the shear strength improved dramatically from 37.1 ± 1.6 MPa to 114.8 ± 4.3 MPa. These findings highlight the significant role of Fe-based metallic glass particles as a reinforcing phase, enhancing the density and mechanical characteristics of the Cu-based composite coatings. © 2025, The Authors. All rights reserved.

关键词： Shear strength

First-Principles Insights into Micro-Alloying Roles of Zr in Cu-Cr-Zr Alloys

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SSRN 2023年

作者： Zhang, Chaomin Jiang, Yong Zhou, Yanjun Guo, Xiuhua Song, Kexing School of Materials Science and Engineering Henan Key Laboratory of Non-ferrous Materials Science & Processing Technology Henan University of Science and Technology Luoyang471023 China Provincial and Ministerial Co-construction of Collaborative Innovation Center for Nonferrous Metal New Materials and Advanced Processing Technology Henan University of Science and Technology Luoyang471023 China State Key Laboratory of Powder Metallurgy China Henan Academy of Sciences Zhengzhou450000 China

Interface segregation has been often neglected in exploring micro-alloying mechanisms in polycrystalline Cu-Cr-Zr alloys. In this study, interface structure modeling and first-principles calculations were carried out to explore the segregation behaviors of micro-alloying element Zr at nano-Cr particle interfaces and a series of low-Σ (Σ≤11) Cu grain boundaries (GBs) in Cu-Cr-Zr alloys. The effects on interface structures and bond strength were intensively calculated and compared. Our results suggested that Zr can substitute the top-most Cu atoms at most nano-Cr particle interfaces (with the dominant Nishiyama–Wassermann orientation relation), but up to the 1/3 ML coverage only. The segregation to other nano-Cr interfaces (with the Kurdjumov–Sachs orientation relation) is energetically forbidden. At all the low-Σ GBs (except the Σ3(111)), Zr segregation can be consistently favored up to a full coverage (1 ML), improving the GB binding strength by ∼30%. The GB segregation can not only help improve the plasticity and toughness of the alloys, but also add benefits into the grain-refinement effect of Zr. Based on these results, the multi-fold benefits of micro-alloying Zr were concluded. © 2023, The Authors. All rights reserved.

关键词： Grain boundaries

In(Otf)3 Simultaneously Catalyzes the In-Situ Polymerization of 1,3-Dioxolane and Construct an Alloyed Protective Layer on Lithium Anode

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SSRN 2024年

作者： Deng, Haoyu Yang, Xueting Chen, Hanghang Ye, Dezhan Jiang, Xiancai Chen, Yazhou Wang, Chenyi State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University No.1 Yangguang Avenue Jiangxia District Hubei Wuhan430200 China School of Materials Science and Engineering Wuhan Textile University No.1 Yangguang Avenue Jiangxia District Hubei Wuhan430200 China Jiangsu Province Engineering Research Center of Intelligent Manufacturing Technology for the New Energy Vehicle Power Battery Changzhou University Jiangsu Changzhou213164 China School of Chemical Engineering Fuzhou University Fuzhou350108 China

The emerging approach of in-situ polymerization of solid polymer electrolytes based on 1,3-dioxolane (DOL) has the advantage of low interfacial impedance and relatively high Coulombic efficiency with lithium anode. However, the DOL monomer conversion (C%) under Lewis acid catalysts need to be further improved, besides their alloying ability with lithium metal to generate protective interfacial layer has been ignored. Here, a Lewis acid catalyst In(OTf)3, which can not only achieve high C% (95.7%) at room temperature, but also react with lithium metal to form a stable LiF/LixIn-based composite SEI layer. The electrochemical test results show that the lithium ionic conductivity is as high as 7.1´10-4 S cm-1 at room temperature, the oxidation potential is over 4.5V, and the Li+ transfer number is up to 0.42. In addition, the Li/Li symmetrical cell assembled with this electrolyte can be stably cycled for more than 500 h at 3mA cm-2, with an over-potential of 178mv;X-ray diffraction results confirm the presence of In and In-Li alloy peaks that is formed by the reduction of In(OTf)3 with lithium metal. The assembled Li/LiFePO4 battery delivers specific discharge capacity and capacity retention rates of 115.5mAh g-1 and 85%, respectively after 300 cycles at 1C. Through the simple design, the dual-function electrolyte is prepared, which further broadens the design idea of solid polymer electrolyte © 2024, The Authors. All rights reserved.

关键词： Lithium compounds

Evolution of Carbon Fiber in Multiple Thermal-Mechanical Coupling Environment

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SSRN 2023年

作者： Zhang, Wenlu He, Jiahao Li, Jiugang Liu, Zhijiang Li, Qingyang Zhang, He He, Chong Li, Wenbin State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Hubei Wuhan430200 China School of Textile Science and Engineering Wuhan Textile University Hubei Wuhan430200 China School of Textile and Material Engineering Dalian Polytechnic University Liaoning116034 China General Space Engineering Department China Aerospace Science and Industry Corporation Beijing100854 China

The rapid development of aerospace industry has put forward high demands on the performance of carbon fiber. According to the current demand for the application of carbon fiber to flexible foldable aerospace structure braids. It is crucial to explore the mechanical properties and microstructure evolution of single carbon fiber under thermal-mechanical coupling environment. A synchronous test platform was constructed to investigate the changes in carbon fiber under the conditions of heat, force, oxygen, and airflow erosion. It was proved that behavior of carbon fiber can be affected by the heat, force, oxygen, and airflow erosion, which would further lead to a decrease in the mechanical properties of carbon fiber. On the other hand, carbon fiber treated only by high temperature does not exhibit hairiness on its surface. In the heat, force, oxygen, and airflow erosion couple environment, strength of carbon fiber declines fast is between 400 to 600 °C, resulting in a loss of fiber strength from 0.3 N/tex to 0.02 N/tex and a strength loss of about 60%. The multi-factor coupling environment makes carbon fiber prone to crystallization, which would lead to the increase of internal defects in the fiber. Below 1000 °C, there was no other peak except weak silica phase. As the temperature increases, the plastic deformation of weak silica phase in carbon fiber becomes more apparent, with the strain of carbon fiber reduced from 2.5 mm to 1.3 mm. This work aims to provide a foundation for the application of carbon fiber in the aviation environment. © 2023, The Authors. All rights reserved.

关键词： Carbon fibers