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Inter-Site Distance Effect in Electrocatalysis

Angewandte Chemie 2025年

作者： Jiongcan Xiang Pengfei Wang Panpan Li Min Zhou Guihua Yu Zhaoyu Jin Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 611731 China College of Materials Science and Engineering Sichuan University Chengdu 610065 China State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China Materials Science and Engineering Program and Walker Department of Mechanical Engineering the University of Texas at Austin Austin TX 78712 USA

The inter-site distance effect (ISDE) has gained significant attention in heterogeneous catalysis, challenging classical models that treat adjacent nonbonded sites as isolated. Recent studies demonstrate that these sites can exhibit long-range cooperative interactions, enhancing reaction efficiencies. Fully leveraging the ISDE to overcome limitations in site reactivity requires a multidisciplinary approach and advanced techniques. This review provides a comprehensive overview of ISDE in electrocatalysis, starting with strategies for synthesizing materials with tunable inter-site distances. It examines ISDE across various catalyst models, including monometallic and heteronuclear atomic sites, active sites within clusters, and the lattice of nanocatalysts, focusing on their electronic structures, spatial geometries, and synergistic interactions. Advanced characterization and computational methods are highlighted as essential for identifying inter-site structures and distances, providing a systematic framework for understanding ISDE's role in electrocatalysis. The review also proposes best practices for studying ISDE, addressing current challenges and offering future perspectives. These insights aim to inform the design of highly efficient catalysts, enhance the understanding of catalytic mechanisms, and contribute to the development of more efficient energy conversion technologies, providing a foundation for further research into optimizing electrocatalysts.

关键词： Electrocatalysis Inter-site distance Single-atom catalysts Site density

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Learning Stable Models for Prediction and Control

arXiv

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arXiv 2020年

作者： Mamakoukas, Giorgos Abraham, Ian Murphey, Todd D. Department of Mechanical Engineering Northwestern University Evanston IL60208 United States The Robotics Institute Carnegie Mellon University PittsburghPA15213 United States

This paper demonstrates the benefits of imposing stability on data-driven Koopman operators. The data-driven identification of stable Koopman operators (DISKO) is implemented using an algorithm [1] that computes the nearest stable matrix solution to a least-squares reconstruction error. As a first result, we derive a formula that describes the prediction error of Koopman representations for an arbitrary number of time steps, and which shows that stability constraints can improve the predictive accuracy over long horizons. As a second result, we determine formal conditions on basis functions of Koopman operators needed to satisfy the stability properties of an underlying nonlinear system. As a third result, we derive formal conditions for constructing Lyapunov functions for nonlinear systems out of stable data-driven Koopman operators, which we use to verify stabilizing control from data. Lastly, we demonstrate the benefits of DISKO in prediction and control with simulations using a pendulum and a quadrotor and experiments with a pusher-slider system. The paper is complemented with a video: https://***/view/learning-stable-koopman. Copyright © 2020, The Authors. All rights reserved.

关键词： Nonlinear systems

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MOF-derived spinel NiMn2O4/CoMn2O4 heterojunction and its application in a high-performance photocatalyst and supercapacitor

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Journal of Environmental Chemical engineering 2023年第5期11卷

作者： Lee, Kuen-Chan Hsiao, Yu-Sheng Sung, Ming-Yen Chen, Yi-Lun Wu, Nian-Jheng Huang, Jen-Hsien Cho, Er-Chieh Weng, Huei Chu Hsu, Shih-Chieh Department of Science Education National Taipei University of Education No. 134 Section 2 Heping E. Road Da-an District Taipei City106 Taiwan Ph.D. Program in Medical Neuroscience College of Medical Science and Technology Taipei Medical University 250 Wuxing Street Taipei City110 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology No. 43 Section 4 Keelung Road Da-an District Taipei10607 Taiwan Department of Clinical Pharmacy School of Pharmacy College of Pharmacy Taipei Medical University 250 Wuxing Street Taipei City110 Taiwan Université Paris-Saclay CNRS Institut des Sciences Moléculaires d′Orsay Orsay91405 France Department of Green Material Technology Green Technology Research Institute CPC Corporation No. 2 Zuonan Rd. Nanzi District Kaohsiung City81126 Taiwan Department of Mechanical Engineering Chung Yuan Christian University No. 200 Chungpei Rd Chungli District Taoyuan City32023 Taiwan Department of Chemical and Materials Engineering Tamkang University No. 151 Yingzhuan Road Tamsui District New Taipei City25137 Taiwan

Metal oxide heterojunctions have attracted considerable attention in photocatalyst and supercapacitor applications. In this study, NiMn2O4/CoMn2O4 (NMO/CMO) heterojunctions were synthesized using ternary metal-organic frameworks (MOFs) as precursors. After calcination at 500 °C, the as-prepared NMO/CMO composite maintains the porous sheet-like morphology of the ternary MOF, exhibiting a highly porous structure. The heterostructured NMO/CMO composite demonstrates enhanced photocatalytic performance compared with pure NMO and CMO. This enhancement may be attributed to the well-aligned energy levels at the NMO/CMO interface, which effectively reduces charge recombination and facilitates the efficient transport of photogenerated carriers. In addition, the NMO/CMO heterojunction exhibits enhanced supercapacitor performance owing to the increased number of active redox sites and reduced charge transfer resistance. When tested at 3 A/g, the NMO/CMO composite displays a higher capacitance (756.4 F/g) than pure NMO (579.6 F/g) and CMO (519.6 F/g) and remarkable rate capability, maintaining a capacitance of 639 F/g even at 10 A/g. Notably, asymmetric supercapacitors fabricated using NMO/CMO and activated carbon can achieve an energy density of 32.18 W h/kg at 750 W/kg and superior cycling life, retaining 92.1% of its initial capacitance after 3000 cycles. © 2023 Elsevier Ltd

关键词： Heterojunctions

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Chemically Binding Scaffolded Anodes with 3D Graphene Architectures Realizing Fast and Stable Lithium Storage

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Research 2019年第1期2019卷 662-670页

作者： Ping Wu Zhiwei Fang Anping Zhang Xiao Zhang Yawen Tang Yiming Zhou Guihua Yu Materials Science and Engineering Program and Department of Mechanical Engineering Te University of Texas at AustinAustinTexas 78712USA Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China

Tree-dimensional(3D)graphene has emerged as an ideal platform to hybridize with electrochemically active materials for improved ***,for lithium storage,current anodic guests ofen exist in the form of nanoparticles,physically attached to graphene hosts,and therefore tend to detach from graphene matrices and aggregate into large congeries,causing considerable capacity fading upon repeated ***,we develop a facile double-network hydrogel-enabled methodology for chemically binding anodic scafolds with 3D graphene *** tin-based alloy anodes as an example,the doublenetwork hydrogel,containing interpenetrated cyano-bridged coordination polymer hydrogel and graphene oxide hydrogel,is directly converted to a physical-intertwined and chemical-bonded Sn−Ni alloy scafold and graphene architecture(Sn−Ni/G)dual *** unique dual framework structure,with remarkable structural stability and charge-transport capability,enables the Sn−Ni/G anode to exhibit long-term cyclic life(701 mA h g^(−1) afer 200 cycles at 0.1 A g^(−1))and high rate performance(497 and 390 mA h g^(−1) at 1 and 2 A g^(−1),respectively).Tis work provides a new perspective towards chemically binding scafolded low-cost electrode and electrocatalyst materials with 3D graphene architectures for boosting energy storage and conversion.

关键词： anodic attached boosting

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Repeatability measurement and kinematic identification of LBR iiwa 7 R800 using monocular camera

Repeatability measurement and kinematic identification of LB...

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2019 Conference on Advances in robotics, AIR 2019

作者： Jain, Aditya Singh, Hardeep Boby, Riby Abraham Saha, Subir Kumar Kumar, Swagat Roy, Sumantra Dutta Department of Mechanical Engineering Indian Institute of Technology Delhi New Delhi India TCS Innovation Lab Robotics and Embedded System Group Bangalore India Department of Electrical Engineering Indian Institute of Technology Delhi New Delhi India

ISBN: (纸本)9781450366502

In this paper, we have performed the kinematic identification and repeatability analysis of LBR iiwa 7 R800 (7 axis serial link robot) using monocular camera mounted at the end-effector of the robot. We started the process with the camera calibration process to identify intrinsic and extrinsic parameters of the camera used. In order to determine the pose of the end-effector using camera for repeatability analysis, we have used a 9x6 checkerboard for the repeatability experiment and for kinematic identification we have used ArUco markers. For repeatability analysis, we have used poses from ISO 9283 standards. Also we have used dispersion as a statistical means for quantifying the repeatability analysis. Subsequently, we have compared the results of kinematic identification with those from laser sensors and the theoretical CAD data sheet provided for the robot. Also in this paper, the algorithm has been introduced for measuring repeatability under force control mode and consequently, a single point repeatabilty has been evaluated. © 2019 Copyright held by the owner/author(s). Publication rights licensed to ACM.

关键词： Cameras

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Adaptive single action control policies for linearly parameterized systems ∗

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ASME 2019 Dynamic Systems and Control Conference, DSCC 2019

作者： Ennasr, Osama Mamakoukas, Giorgos Castaño, Maria Coleman, Demetris Murphey, Todd Tan, Xiaobo Smart Microsystems Lab Department of Electrical and Computer Engineering Michigan State University East LansingMI48823 United States Neuroscience and Robotics Lab Department of Mechanical Engineering Northwestern University EvanstonIL60208 United States

ISBN: (纸本)9780791859148

This paper presents an adaptive, needle variation-based feedback scheme for controlling affine nonlinear systems with unknown parameters that appear linearly in the dynamics. The proposed approach combines an online parameter identifier with a second-order sequential action controller that has shown great promise for nonlinear, underactuated, and high-dimensional constrained systems. Simulation results on the dynamics of an underwater glider and robotic fish show the advantages of introducing online parameter estimation to the controller when the model parameters deviate from their true values or are completely unknown. Copyright © 2019 ASME.

关键词： Controllers

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A Spatial-temporal Multiplexing Method for Dense 3D Surface Reconstruction of Moving Objects

A Spatial-temporal Multiplexing Method for Dense 3D Surface ...

引用

IEEE International Conference on robotics and Automation (ICRA)

作者： Congying Sui Kejing He Zerui Wang Congyi Lyu Huiwen Guo Yun-Hui Liu T Stone Robotics Institute and Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Shatin Hong Kong China The Smarteye Tech Shenzhen China

ISBN: (数字)9781728173955

ISBN: (纸本)9781728173962

Three-dimensional reconstruction of dynamic objects is important for robotic applications, for example, the robotic recognition and manipulation. In this paper, we present a novel 3D surface reconstruction method for moving objects. The proposed method combines the spatial-multiplexing and time-multiplexing structured-light techniques that have advantages of less image acquisition time and accurate 3D reconstruction, respectively. A set of spatial-temporal encoded patterns are designed, where a spatial-encoded texture map is embedded into the temporal-encoded three-step phase-shifting fringes. The specifically designed spatial-coded texture assigns high-uniqueness codeword to any window on the image which helps to eliminate the phase ambiguity. In addition, the texture is robust to noise and image blur. Combining this texture with high-frequency phase-shifting fringes, high reconstruction accuracy would be ensured. This method only requires 3 patterns to uniquely encode a surface, which facilitates the fast image acquisition for each reconstruction step. A filtering stereo matching algorithm is proposed for the spatial-temporal multiplexing method to improve the matching reliability. Moreover, the reconstruction precision is further enhanced by a correspondence refinement algorithm. Experiments validate the performance of the proposed method including the high accuracy, the robustness to noise and the ability to reconstruct moving objects.

关键词： Image reconstruction Multiplexing Three-dimensional displays Surface reconstruction Robots Encoding Reliability

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Correction to: Nucleation of voids at Li‑metal–ceramic–electrolyte interfaces

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MRS Communications 2021年第5期11卷 699-699页

作者： Raj, Rishi Materials Science and Engineering Program Department of Mechanical Engineering University of Colorado Boulder Boulder USA

This article was updated to correct the fourth paragraph in the introduction. Due to errors introduced during the production process Ω appeared as W throughout the paragraph.

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An Innovative Elastomer Serpentine Heat Exchanger

SSRN

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SSRN 2023年

作者： de Souza, Reinaldo Rodrigues Sá Barbosa, Filipe M. Nobrega, Glauco Cardoso, Elaine Maria Teixeira, J.C.F. Moita, Ana Sofia Lima, R. Metrics Mechanical Engineering Department University of Minho Campus de Azurém Guimarães4800-058 Portugal IN+ Center for Innovation Technology and Policy Research Instituto Superior Técnico Universidade de Lisboa Av. Rovisco Pais Lisboa1049-001 Portugal UNESP - São Paulo State University School of Engineering Post-Graduation Program in Mechanical Engineering Av. Brasil 56 SP Ilha Solteira15385-000 Brazil UNESP - São Paulo State University Câmpus of São João da Boa Vista São João da Boa Vista Brazil CINAMIL—Centro de Investigação Desenvolvimento e Inovação da Academia Militar Academia Militar Instituto Universitário Militar Rua Gomes Freire Lisboa1169-203 Portugal R. Dr. Roberto Frias Porto4200-465 Portugal

This work aims to present the development stages of a serpentine heat exchanger, composed uniquely of a thin layer of a silicon-based organic elastomeric polymer, polydimethylsiloxane (PDMS). The novelty of this heat exchanger is that it allows the flowing liquid to wet the surface to be cooled directly, an innovation in relation to traditional exchangers, generally made up of tubes coupled to the heating surfaces. In order to evaluate its thermal performance, experimental flow tests compared two PDMS serpentines with a hydraulic diameter of around 5.0 mm with a traditional tubular copper serpentine. The heat exchanger made of PDMS was coupled to a steel plate that simulated the rear side of a photovoltaic thermal solar panel (PVT). In addition, different geometries were tested. Although PDMS is considered a material of low thermal conductivity, the experimental results showed a greater cooling capacity when compared to the traditional heat exchanger. Though the experimental results presented here were obtained for a specific case, the innovation can be used for thermal control of central process units (CPUs), smartphones, tablets, video games, and other mechanical and electronic devices with high cooling requirements © 2023, The Authors. All rights reserved.

关键词： Thermal conductivity

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Kinematic modelling and analysis of single leg in hybrid wheel-legged mobile robot

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IOP Conference Series: Materials Science and engineering 2021年第1期1132卷

作者： P Arunkumar A P Sudheer M L Joy Mechatronics/Robotics Lab Department of Mechanical Engineering National Institute of Technology Calicut India-673601

Mobile manipulators are extensively used in various applications. Most of the mobile manipulators are built on a wheeled mobile platform. A wheeled mobile platform performs well on flat terrains but is not suitable for navigation in rough terrains. The legged robots are commonly used for rough terrain applications. However, the navigation speed of legged robots is lesser than wheeled mobile robots. This paper focuses on the development of hybrid wheellegged robots to overcome the above difficulties. The proposed model is quadruped with five degrees of freedom in each leg. The development of the kinematic model, its dimensional synthesis, and motion study for a single leg is presented in detail. DH-conventions are used for kinematic modelling, manipulability index is used for dimension synthesis, and motion study is carried out in ADAMS.

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