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Electron induction of atomically dispersed Fe sites by adjacent Te atoms promotes CO₂ activation in electroreduction

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Chem Catalysis 2023年第6期3卷

作者： Pan, Yuan Liu, Chuhao Zhang, Nannan Li, Min Wang, Minmin Yang, Xuan Chen, Hsiao-Chien Zhang, Yanhui Hu, Wei Yan, Wensheng Chen, Hao Ming Liu, Shoujie Xiao, Hai Li, Jun Chen, Chen State Key Laboratory of Heavy Oil Processing China University of Petroleum (East China) Qingdao 266580 China Department of Chemistry Tsinghua University Beijing 100084 China College of Chemistry and Molecular Engineering Peking University Beijing 100871 China School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 China Center for Reliability Sciences and Technologies Chang Gung University Taoyuan 33302 Taiwan School of Materials Science and Engineering Key Laboratory for Anisotropy and Texture of Materials Ministry of Education Northeastern University Shenyang 110819 China National Synchrotron Radiation Laboratory University of Science and Technology of China Anhui Hefei 230029 China Department of Chemistry National Taiwan University Taipei 106 Taiwan School of Materials Science and Engineering Anhui University Hefei 230601 China

We report an electron induction regulation mechanism of single-atomic Fe sites by adjacent Te atoms to construct Fe–Te diatomic sites (DASs) for synergistic electrocatalytic CO₂ reduction reaction (CO₂RR). The Fe–Te DASs feature stable and unique N₃Fe–TeC₃ structures, with low-valence Fe^δ+ binding with one C atom and one O atom of CO₂, and the adjacent Te^δ+ acts as an electron donor, adjusting the electronic structure of Fe^δ+ sites, and stabilizes another negative O atom of CO₂ by favorable electrostatics, strengthening CO₂ adsorption and activation. Notably, the catalyst delivers a high CO selectivity above 90% over a wide potential range and good stability. The formation of Fe–Te DASs elevates the Fermi level and strengthens the interaction of the 2 π_u orbital of CO₂, which is easier to bend and forms activated CO₂ intermediate, thereby decreasing the activation barrier and promoting the CO₂RR process. © 2023 Elsevier Inc.

关键词： CO2 reduction reaction diatomic sites electrocatalysis electron induction SDG7: Affordable and clean energy single atom catalysts

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Utilizing Urban and Agricultural Waste for Sustainable Production of Mesoporous Hybrid Nanocomposites for Adsorption and Photocatalytic Degradation of Synthetic Dyes

SSRN

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SSRN 2024年

作者： Kamal, Abo-Bakr Hassane, Abdallah M.A. Abdel-Aty, Abdel-Haleem Nisar, Kottakkaran Sooppy Mohamoud, Mona An, Cuihua Deng, Qibo Hu, Ning Abolibda, Tariq Z. Altaleb, Hamud A. Gomha, Sobhi M. Shenashen, Mohamed A. Gomaa, Hassanien Department of Chemistry Faculty of Science Al-Azhar University Assiut71524 Egypt Botany and Microbiology Department Faculty of Science Al-Azhar University Assiut71524 Egypt Department of Physics College of Sciences University of Bisha Bisha61922 Saudi Arabia Department of Mathematics College of Science and Humanities in Alkharj Prince Sattam Bin Abdulaziz University Alkharj11942 Saudi Arabia Department of Physics College of Science King Khalid University P.O. Box 9004 Abha61413 Saudi Arabia School of Mechanical Engineering Hebei University of Technology Tianjin300401 China State Key Laboratory of Reliability and Intelligence Electrical Equipment Key Laboratory of Advanced Intelligent Protective Equipment Technology Ministry of Education School of Mechanical Engineering Hebei University of Technology Tianjin300401 China Department of Chemistry Faculty of Science Islamic University of Madinah Madinah42351 Saudi Arabia Nasr City11727 Egypt 1-2-1 Sengen Ibaraki-ken Tsukuba305-0047 Japan Faculty of Engineering and Quantity Surveying INTI International University Negeri Sembilan Malaysia

Discharging untreated dye waste from diverse industrial sectors into wastewater poses significant risks to both human health and the environment. This study aims to create a hybrid mesoporous silver nanoparticles@mesoporous carbon (AgNPs@MMC) nanocomposite adsorbent/photocatalyst. This nanocomposite was created by combining AgNPs from urban waste (X-ray film waste) with MMC derived from mango peel carbon. The significance of this research lies in (i) recycling urban and agricultural waste;(ii) removing methyl violet 10B (MV10B) dye;and (iii) assessing the antimicrobial activity. The optimal adsorption conditions and PCD of MV10B dye were investigated through practical experiments. Isotherm models, kinetic models, photocatalyst bandgap, scavenger tests, and density functional theory (DFT) calculations were employed to elucidate the removal mechanism. The results demonstrated that the PCD process outperformed adsorption in terms of time and quantity, removing >98% of MV10B in 25 mg of AgNPs@MMC within 30 min. Moreover, the AgNPs@MMC could be reused for five cycles without a considerable reduction in removal efficiency. Crucially, AgNPs@MMC efficiently removed MV10B from real wastewater at a neutral pH, highlighting its potential for removing cationic pollutants from aquatic environments. The AgNPs@MMC nanocomposite showed satisfactory anti-bacterial performance against Gram-negative bacterial strains such as Escherichia coli, Pseudomonas vulgaris, and Vibrio parahaemolyticus. © 2024, The Authors. All rights reserved.

关键词： Adsorption

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An Integration Method of Expert Experience and ADT Data Based on Uncertain Cross-Entropy 3

An Integration Method of Expert Experience and ADT Data Base...

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3rd International Conference on System reliability and Safety, ICSRS 2018

作者： Chen, Wen-Bin Li, Xiao-Yang Kang, Rui Beihang University School of Reliability and Systems Engineering Beijing China Science and Technology on Reliability and Environmental Engineering Laboratory Beihang University Beijing China

ISBN: (纸本)9781728102382

Accelerated degradation testing (ADT) is widely applied to evaluate product reliability and lifetime before releasing products to the market. The degradation data from ADTs are usually integrated with expert experience in the development phase for high accurate reliability assessments. However, in practical applications, expert experience may only provide subjective knowledge, and the degradation data are usually scarce due to the limited test resources in conducting ADTs. So epistemic uncertainties are embedded in both expert experience and ADTs. Therefore, the integration of these two information sources with epistemic uncertainties for high accurate reliability assessments is an urgent issue to be solved. To address such issue, a novel uncertain information integration method of expert experience and ADT data based on uncertain cross-entropy is presented. First, the uncertainty theory is introduced to obtain the lifetime characteristic distribution from expert opinions and to model the degradation process from ADT data. Then, the reliability information of these two sources is integrated for reliability assessments based on uncertain cross-entropy. A case study of the integration of expert experience and stress relaxation ADT data for electrical connector is applied to verify the effectiveness of the proposed method. © 2018 IEEE.

关键词： Uncertainty analysis

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Research on measurement methods of transferability between different domains in transfer learning 11

Research on measurement methods of transferability between d...

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11th CAA Symposium on Fault Detection, Supervision, and Safety for Technical Processes, SAFEPROCESS 2019

作者： Qin, Ruochen Lu, Chen School of Reliability and Systems Engineering Beihang University Beijing100191 China Science and Technology on Reliability Environmental Engineering Laboratory Beijing100191 China

ISBN: (纸本)9781728106816

If transfer learning can be used in fault diagnosis of rotating machinery, the transferability between different fault domains should be measured first. A certain degree of similarity between the source domain and the target domain is the prerequisite for the effectiveness of the transfer learning method. In this paper, the transferability measurement results of mahalanobis distance, Kullback-Leibler Divergence and Maximum Mean Discrepancy (MMD) between data domains are compared and analyzed. And the stability and accuracy of mobility measurement results are compared and analyzed by using statistical analysis and anomaly detection. Finally, a case study is carried out using the gearbox data set to verify the effectiveness and superiority of the transferability measurement based on MMD method. © 2019 IEEE.

关键词： Rotating machinery

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Topology Optimization of Compliant Mechanisms Considering Manufacturing Uncertainty, Fatigue and Static Failure Constraints

SSRN

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SSRN 2022年

作者： Zhao, Dongpo Wang, Haitao Fang, Lixue Liu, Wenbo Liu, Qiang School of Mechanical Engineering Nanjing University of Science and Technology NanjingJ.S. 210094 China School of Mechanical and Electrical Engineering Shenzhen Polytechnic Shenzhen518055 China School of Civil Engineering Hefei University of Technology HefeiA.H. 230009 China School of Mechanical Engineering and Automation Beihang University Beijing100191 China Key Laboratory of CNC Equipment Reliability Ministry of Education School of Mechanical and Aerospace Engineering Jilin University Changchun130022 China

This paper proposes and investigates a topology optimization method of compliant mechanisms considering manufacturing uncertainty, fatigue, and static failure constraints. The equivalent-static analysis method is employed to analyze the proportional loadings with constant amplitude, the fatigue failure of compliant mechanisms is evaluated by the modified Goodman criterion, and the static failure of compliant mechanisms is evaluated by the sum of the amplitude and the mean absolute value of the signed Von-Mises stress. Considering the complexity of multi-performance constraints, the static and fatigue failure constraints are converted into different stress constraints, and the P-norm approach is employed to transform the local constraints into global constraints. In order to meet the manufacturing process, a three-field density projection is implemented to address manufacturing uncertainty in the optimization procedure. Meanwhile, three different combinations of alternating and mean stresses are evaluated to test the fatigue and failure resistance of the optimized design: von Mises, sines theory, and signed von Mises. The optimization results show that: (1) the optimization problem of the maximum output displacement of a compliant mechanism can effectively solve the manufacturing uncertainty, fatigue, and static failure;(2) the multi-performance coupling manufacturing constraint can reduce the stress level of the compliant mechanism, and has a significant effect on suppressing the stress concentration phenomenon;and (3) compared with the traditional method, although the method satisfies the following size manufacturing constraints and strength requirements, the output displacement of the machine is reduced. © 2022, The Authors. All rights reserved.

关键词： Compliant mechanisms

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Analysis of GaN HEMT Degradation under RF Overdrive Stress

Analysis of GaN HEMT Degradation under RF Overdrive Stress

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Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)

作者： YuHan Xie RongSheng Chen Chang Liu YiQiang Chen Yan Ren The School of Electronic and Information Engineering South China University of Technology Guangzhou China The Science and Technology on Reliability Physics and Application of Electronic Component Laboratory The No.5 Electronics Research Institute of the Ministry of Industry and Information Technology Guangzhou China

ISBN: (纸本)9781665448178

This work concentrated at the degradation characteristics of GaN HEMT devices when exposed to RF overdrive stress. According to results of the experiment, the drain current of GaN HEMT decreases by 35.6% from 877 mA to 564mA after RF overstress. Moreover, after the experiment, the threshold voltage has a 0.26-V positive shift, and the maximum transconductance decreases. The gate leakage current increases by three times more than that of original ones. The gate-lag characteristics also deteriorates with the increase of experimental time. After measuring the high frequency performance, the return loss of the device degrades. Based on the measurement of leakage current, the height of Schottky barrier before and after the experiment was calculated and the captured charge density was extracted as ${1.11\,\times \,10^{14}\,cm^{2}}$ by combining with the threshold voltage drift.

关键词： Radio frequency Degradation Current measurement Schottky barriers HEMTs Threshold voltage Loss measurement

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An Empirical Study of Flight Control System Model Checking Integrated with FMEA

An Empirical Study of Flight Control System Model Checking I...

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IEEE International Conference on Software Quality, reliability and Security Companion (QRS-C)

作者： Xinyi Wang Gaolei Yi Yichen Wang School of Reliability and Systems Engineering Beihang University Beijing China School of Reliability and Systems engineering Beihang University Science and Technology on Reliability and Environmental Engineering Laboratory Beihang University Beijing China

ISBN: (数字)9781728189154

ISBN: (纸本)9781728189161

Cyber-Physical Systems (CPS) is a multidimensional complex system that integrates computing, network and physical environment. Flight control system enables the aircraft to interact with the outside world and other components, which is a typical CPS. The Verification of safety has been a research hotspot. Model checking is a formal verification method with a high degree of automation, including three steps: model construction, properties specifications and execution. In general, Properties has been generated based on the subjective experience of the verifier, and there is a lack of a strict process. We focus on the process of establishing specifications using Failure mode and effect analysis (FMEA) And then use our improved method to do the requirement level model checking about the return process and collision prevention based on PX4 flight control system. The results prove that our method makes the model checking logic clearer and has good adaptability.

关键词： Process control Software quality Model checking Software reliability Safety Security Aerospace control

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Negative gate bias stress effects on conduction and low frequency noise characteristics in p-type poly-Si thin-film transistors

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Chinese Physics B 2019年第8期28卷 397-402页

作者： Chao-Yang Han Yuan Liu Yu-Rong Liu Ya-Yi Chen Li Wang Rong-Sheng Chen School of Electronic and Information Engineering South China University of TechnologyGuangzhou 510640China School of Automation Guangdong University of TechnologyGuangzhou 510006China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory CEPREIGuangzhou 510610China

The instability of p-channel low-temperature polycrystalline silicon thin film transistors(poly-Si TFTs)is investigated under negative gate bias stress(NBS)in this ***,a series of negative bias stress experiments is performed,the significant degradation behaviors in current-voltage characteristics are *** the stress voltage decreases from-25 V to-37 V,the threshold voltage and the sub-threshold swing each show a continuous shift,which is induced by gate oxide trapped charges or interface ***,low frequency noise(LFN)values in poly-Si TFTs are measured before and after negative bias *** flat-band voltage spectral density is extracted,and the trap concentration located near the Si/SiO2 interface is also ***,the degradation mechanism is discussed based on the current-voltage and LFN results in poly-Si TFTs under NBS,finding out that Si-OH bonds may be broken and form Si*and negative charge OH-under negative bias stress,which is demonstrated by the proposed negative charge generation model.

关键词： polycrystalline silicon thin film transistor negative bias stress low frequency noise

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Sensitivity-Analysis-Based reliability Enhancement for Networked Control Systems

Sensitivity-Analysis-Based Reliability Enhancement for Netwo...

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System reliability and Safety engineering (SRSE), International Conference on

作者： Ying Gao Qiang Dong Mo Tao Wei Zheng Zhiwu Ke Yi Feng School of Reliability and Systems Engineering Beihang University Beijing China Science and Technology on Thermal Energy and Power Laboratory Wuhan China Wuhan Second Ship Design and Research Institute Wuhan China

ISBN: (纸本)9781665401616

Aiming at improving the reliability of networked control systems, this paper first investigates the three types of redundancy methods, including dynamic, static and hybrid redundancy. A sensitivity-analysis-based reliability enhancement method is proposed for networked control systems. Using this method, the key components affecting the system reliability can be found through the reliability sensitivity analysis. The reliability sensitivity analysis result illustrates which components need to be improved first, and either static redundancy, dynamic redundancy or hybrid redundancy can be used to improve the reliability of the networked control system. Finally, a double loop networked control system is used as a case to verify the effect of our method. The static redundancy method is applied on those components which are more sensitive to the system reliability, and the system reliability is effectively improved.

关键词： Networked control systems Sensitivity analysis Redundancy reliability engineering Safety reliability

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Ideal fully spin-polarized type-II nodal line state in half-metals X2YZ4 (X=K, Cs, Rb, Y=Cr, Cu, Z=Cl, F)

arXiv

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arXiv 2021年

作者： He, Tingli Zhang, Xiaoming Wang, Lirong Liu, Ying Dai, Xuefang Wang, Liying Liu, Guodong State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin300130 China School of Materials Science and Engineering Hebei University of Technology Tianjin300130 China Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology School of science Tianjin University Tianjin300354 China

Lorentz-violating type-II nodal lines exhibit attracting physical properties and have been hot discussed currently. However, their investigations have been mostly limited in nonmagnetic system because of lacking ideal spin-polarized candidates with clean type-II nodal line states. Here, for the first time, we report the family of X2YZ4 (X=K, Cs, Rb, Y=Cr, Cu, Z=Cl, F) compounds are such ideal candidate materials by using the member of K2CuF4 as an example. We show the material is a ferromagnetic half-metal with weak anisotropy, which host fully spin-polarized conducting electrons. In the conducting spin channel, the band crossing form a pair of type-II nodal lines, protected by mirror symmetry. These type-II nodal lines are different with former proposed examples because they have a 100% spin polarization. In addition, we also show the material can realize switchable topological states, which can be easily controlled by external magnetic field. It is noticed that, the material: i) is stable and can be synthesized in experiments;ii) has clear magnetic structure;and iii) manifests clean type-II nodal line state and clear drumhead surface states. Therefore, the proposed X2YZ4 compounds are expected to be an excellent platform to investigate the novel physical properties of both type-II nodal line states with complete spin polarization. Copyright © 2021, The Authors. All rights reserved.

关键词： Electronic structure

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