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engineering a Local Free Water Enriched Microenvironment for Surpassing Platinum Hydrogen Evolution Activity

Angewandte Chemie 2022年第35期134卷

作者： Qunlei Wen Junyuan Duan Wenbin Wang Dr. Danji Huang Dr. Youwen Liu Dr. Yongliang Shi Prof. JiaKun Fang Prof. Anmin Nie Prof. Huiqiao Li Prof. Tianyou Zhai State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 P. R. China Contribution: Conceptualization (equal) Investigation (lead) Writing - original draft (lead) Contribution: Formal analysis (equal) Investigation (equal) Contribution: Investigation (supporting) Writing - original draft (supporting) State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 P. R. China Contribution: Formal analysis (supporting) Investigation (supporting) Contribution: Conceptualization (lead) Formal analysis (lead) Writing - review & editing (lead) Center for Spintronics and Quantum Systems State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an Shanxi 710049 P. R. China Contribution: Investigation (lead) Writing - review & editing (equal) Contribution: Conceptualization (supporting) Formal analysis (equal) Investigation (equal) Writing - review & editing (equal) Center for High Pressure Science State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao Hebei 066004 P. R. China Contribution: Formal analysis (equal) Contribution: Writing - review & editing (equal) Contribution: Conceptualization (supporting) Project administration (lead) Supervision (equal) Writing - review & editing (equal)

Manipulating the catalyst–electrolyte interface to push reactants into the inner Helmholtz plane (IHP) is highly desirable for efficient electrocatalysts, however, it has rarely been implemented due to the elusive electrochemical IHP and inherent inert catalyst surface. Here, we propose the introduction of local force fields by the surface hydroxyl group to engineer the electrochemical microenvironment and enhance alkaline hydrogen evolution activity. Taking a hydroxyl group immobilized Ni/Ni 3 C heterostructure as a prototype, we reveal that the local hydrogen bond induced by the surface hydroxyl group drags 4-coordinated hydrogen-bonded H 2 O molecules across the IHP to become free H 2 O and thus continuously supply reactants forcatalytic sites catalytic sites. In addition, the hydroxyl group coupled with the Ni/Ni 3 C heterostructure further lowers the water dissociation energy by polarization effects. As a direct outcome, hydroxyl-rich catalysts surpass Pt/C activity at high current density (500 mA cm −2 @ ≈276 mV) in alkaline medium.

关键词： Electrochemical Double Layer High Current Densities Hydrogen Evolution Local Hydrogen Bond Surface Hydroxyl

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A fully superconducting homopolar DC machine

A fully superconducting homopolar DC machine

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作者： Lin, Feng Qu, Ronghai Li, Dawei Xie, Kangfu State Key Laboratory of Advanced Electromagnetic Engineering and Technology College of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

With the development of superconductors and carbon brush technique, the fully superconducting homopolar dc machine (FSHDM) is promising to realize. In this paper, the principle and performances of FSHDM are discussed, and a 35-kW FSHDM has been designed and analyzed. Through theoretical analysis and finite elements analysis, the FSHDM is found to be with competitive high power density when it is compared with the conventional homopolar dc machine. © 2002-2011 IEEE.

关键词： Finite element method

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Cover Feature: Dual Play of Chitin‐Derived N‐Doped Carbon Nanosheets Enabling High‐Performance Na‐SeS2 Half/Full Cells (Batteries & Supercaps 2/2020)

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Batteries & Supercaps 2020年第2期3卷 128-128页

作者： Jingqi Ma Lingfeng Gao Shuping Li Ziqi Zeng Prof. Lina Zhang 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 430072 P. R. China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430072 P. R. China These authors contributed equally to this work. College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 P. R. China

The Cover Feature shows a battery floating on seawater, which is based on chitin. Under the sea, chitin derived from seafood wastes (like crabs) is beneficial to construct 2D porous carbon nanosheets (CCN), which can be used to storage Na+. Furthermore, SeS2 can be impregnated into CCN to fabricate CCN/SeS2 electrodes. The obtained full cell enables the development of recyclable and scalable battery *** information can be found in the Article by J. Ma et al.

关键词： chitin carbon nanosheets sodium-sulfur battery selenium sulfide room temperature

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Press-Pack and Soldered Packaging IGBT Modules for Pulsed Power Applications

Press-Pack and Soldered Packaging IGBT Modules for Pulsed Po...

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China International Electrical and Energy Conference (CIEEC)

作者： Lubin Han Lin Liang Rui Wang Cai Chen Zihao Zhao Guoqiang Tan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781538653937

Aiming at researching into the low-inductance and good heat dissipation capability of rigid Press-Pack IGBT (PPI), the commercial soldered IGBT module is compared with it in terms of the di/dt and T j in pulse power applications in this paper. The results of the extracted parasitic inductance by the FEM tool show that the parasitic inductance of the Press-Pack IGBT is only 7% of the soldered IGBT module with the same voltage and current rate. The simulated and experimental results show that the discharge current of Press-Pack IGBT module has greater di/dt and a narrower pulse width than the soldered one. The thermoelectric coupling simulations of Press-Pack and soldered IGBT modules show that at repetitive frequency mode, the junction temperature rise of the Press-Pack IGBT is about 50% lower than that of the soldered IGBT. In the thermal steady state experiment, the steady-state junction temperature of the Press-Pack IGBT, even with a higher power, is lower than that of the soldered IGBT module. Therefore, the Press-Pack IGBT module shows better heat dissipation capability and is more suitable for repetitive pulsed power applications.

关键词： Insulated gate bipolar transistors Inductance Temperature measurement Junctions Thermal resistance Heating systems

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Ablation characteristics of hybrid target materials for laser triggered vacuum switches

Ablation characteristics of hybrid target materials for lase...

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International Conference on Mechanical, Electric and Industrial engineering, MEIE 2018

作者： Hui, Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei430074 China Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy Hubei University of Technology Wuhan430068 China Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China

The key difference of laser triggered vacuum switch (LTVS) and electrical triggered vacuum switch (ETVS) is the different triggered way, because the initial plasmas were generated by laser irradiation target material of LTVS, which generates different impact on the triggered characteristics of LTVS with different target materials. There are three laser wavelength (1064nm, 532nm and 266nm) which are tested the triggered characteristics of target materials, with decreased conduction time delay under the condition of increasing laser energy. © Published under licence by IOP Publishing Ltd.

关键词： Hybrid materials

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Multiband filter: Estimator of different frequency components of grid voltage

Multiband filter: Estimator of different frequency component...

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6th International Conference on Renewable Power Generation

作者： Huang, Chenhui Yuan, Xiaoming Li, Sheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

With the rapid development of renewable energy, an increasing number of power electronic devices is integrated into the power system. Multi-time-scale controllers of these devices bring about diverse oscillations and harmonics which have threatened the stable operation of the power system. The accurate estimation of oscillations becomes the primary task to tackle this problem. This study proposes a novel cross-coupled filter to accurately detect fundamental component and other frequency components. In addition, the transfer function in the frequency domain is given to describe the actual input–output relationship. Furthermore, the harmonic components which are filtered out do not have amplitude changes and phase shifts between the input and the output. Finally, the accuracy of the transfer function is verified by simulation. © 2017 Institution of engineering and technology. All Rights Reserved.

关键词： Transfer functions

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Modal analysis of a grid-connected DFIG-based WT considering multi-timescale control interactions

Modal analysis of a grid-connected DFIG-based WT considering...

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6th International Conference on Renewable Power Generation

作者： Wan, Minhui Hu, Jiabing State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

In a grid-connected doubly fed induction generator (DFIG)-based wind turbine system, the multi-timescale control loops of DFIGs work together to keep the output active/reactive power tracking their references. In weak AC grid condition where the grid impedance cannot be neglected, interactions among those control loops are very strong. This study presents a modal analysis of the system containing a DFIG. The DFIG model for analysis considers multi-timescale control and its interactions. The effect of bandwidths of rotor speed control, phaselocked loop, DC-link voltage control and rotor current control on system stability is presented. Interactions among those control loops are explored. The analysis results indicate that the interactions among multi-timescale control are strong and will have an effect on the stability and the dynamics of the DFIG system under weak AC grid condition. © 2017 Institution of engineering and technology. All rights reserved.

关键词： System stability

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Dynamic characteristic and interaction analysis of synchronous generator based on amplitude–phase motion equation

Dynamic characteristic and interaction analysis of synchrono...

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6th International Conference on Renewable Power Generation

作者： Huang, Luhan Yuan, Xiaoming State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

With the increasing penetration of power electronic devices, the dynamic characteristics of devices and power system change. Thus, new models and analytical methods applied to stability analysis of power electronics dominated power system need to be put forward. This study takes synchronous generator as an example. The method of device modelling based on amplitude–phase motion equation is introduced, and the idea of interaction analysis based on concepts of self-stabilising and en-stabilising is proposed. © 2017 Institution of engineering and technology. All Rights Reserved.

关键词： Synchronous generators

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Wind farm aggregation method based on motion equation concept: A case study

Wind farm aggregation method based on motion equation concep...

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6th International Conference on Renewable Power Generation

作者： Cui, Zhichao Yuan, Xiaoming Zhang, Meiqing State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

With large number of wind farms integrating into grid, the dynamic behaviour of power system has been impacted significantly. To study the impacts of wind farm on power system, the dynamic modelling of wind farm is important. Compared with modelling all the wind turbines of wind farm in detail, aggregating the wind farm to reduce the complexity of model is a better choice. Several studies have put forward some aggregation methods, such as single-machine representation and multi-machine representation. However, applicability of these methods is limited and they cannot aggregate different types of wind turbines. This study proposes a wind farm aggregation method based on motion equation concept. By defining bus voltage as internal voltage of the aggregation model, the relationship between internal voltage and unbalanced power of wind farm is established. An aggregated model of wind farm in DC-link voltage control timescale is built and time-domain simulation results are presented to verify the feasibility of this model. The aggregation method can aggregate wind turbines regardless of their types and working status. In addition, this aggregation method can be applied to modelling other systems in other timescales based on motion equation concept. © 2017 Institution of engineering and technology. All Rights Reserved.

关键词： Equations of motion

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Evaluation of photovoltaic power station operation under the influence of natural environment

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IOP Conference Series: Earth and Environmental Science 2019年第1期354卷

作者： J H Zhang S H Miao Y W Li D Zhang S Y Guo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key Laboratory School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

This paper presents a method for evaluating the operation statute of photovoltaic power plants. It considers the impact of various kinds of natural environment. Firstly, by analysis the impact of different natural factors on photovoltaic power generation, we can find the most influential factors that affect the output of photovoltaic power station. Secondly, use these factors as a standard to separate the natural environments into different kinds. Thirdly, use the AHP method to establish an indicator evaluation system and multiple indicator weight determination methods for different environments. Then, setting proper formula to evaluation the operation statue of photovoltaic power station. Finally, in part 7 a case is proposed to illustrate the present method.

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