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IEEE Annual Southern Power Electronics Conference (SPEC)

作者： Jiarui Xue Wenchao Zhu Changjun Xie School of Automation Wuhan University of Technology Wuhan China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan China

ISBN: (数字)9798350351156

ISBN: (纸本)9798350351163

Predicting degradation behavior is both challenging and essential for the prognosis and health management of proton exchange membrane fuel cells (PEMFCs). This paper considers the voltage recovery phenomenon that occurs during the frequent start-stop cycles of PEMFCs and proposes a voltage recovery (VR) model to calculate and predict the value of voltage recovery. FC1 is used as a reference sample with fully known degradation, while FC2 is considered a cell in the degradation process. A Gate Recurrent Unit (GRU) neural network is employed to learn the mapping relationship between FC1 and FC2 and predict the state of health (SOH) of FC2. Finally, the prediction results from the VR model and the GRU neural network are combined to obtain the final prediction outcome. The proposed hybrid method effectively improves prediction performance by combining the local dynamic characteristics predicted by the VR model with the overall degradation trend predicted by the data-driven method, offering both improved accuracy and practical significance.

关键词： Degradation Protons Accuracy Neural networks Fuel cells Predictive models Market research Data models Power electronics Prognostics and health management

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Hetero-phase MoC-Mo_(2)C nanoparticles for enhanced photocatalytic H_(2)-production activity of TiO_(2)

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Nano Research 2021年第4期14卷 1095-1102页

作者： Jinfeng Liu Ping Wang Jiajie Fan Huogen Yu Jiaguo Yu School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Hexagonal molybdenum carbide(Mo_(2)C)as an effective non-noble cocatalyst is intensively researched in the photocatalytic H_(2)-evolution field owing to its Pt-like H^(+)-adsorption ability and good ***,hexagonal Mo_(2)C-modified photocatalysts possess a limited H_(2)-evolution rate because of the weak H-desorption *** improve the activity,cubic MoC was introduced into Mo_(2)C toform the carbon-modified MoC-Mo_(2)C nanoparticles(MoC-Mo_(2)C@C)by a calcination *** resultant MoC-Mo_(2)C@C(ca.5 nm)was eventually coupled with Ti0_(2)to acquire high-efficiency Ti0_(2)/MoC-Mo_(2)C@C by electrostatic *** highest H_(2)-generation rate of Ti0_(2)/MoC-Mo_(2)C@C reached of 918μmol·h^(-1)·g^(-1)which was 91.8,2.7,and 1.5 times than that of the Ti0_(2),TiO_(2)/MoC@C,and Ti0_(2)/Mo_(2)C@C,*** enhanced rate of Ti0_(2)attributes to the carbon layer as cocatalyst to transmit electrons and the hetero-phase MoC-Mo_(2)C as H_(2)-generation active sites to boost H_(2)-evolution *** research offers a novel insight to design photocatalytic materials for energy applications.

关键词： TiO_(2) MoC-MO_(2)C@C cocatalyst H_(2)evolution photocatalysis

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Fabrication and Property of SiC Ceramic with Large Thickness/Diameter Ratios

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Journal of Wuhan University of technology(materials Science) 2020年第3期35卷 506-513页

作者： TAN Lin HE Qianglong HU Lanxin TIAN Tian WANG Weimin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Silicon carbide ceramics with different thicknesses/diameter ratios were prepared by using ultra-fine silicon carbide powder with the sintering additives of 1.0 wt% boron and 1.5 wt% carbon. The influence of thickness/diameter ratio on the microstructure and density of SiC ceramics was investigated in detail. The experimental results show that the addition of boron and carbon sintering aids can promote the densification process of SiC ceramic, leading to the low sintering temperature and improve mechanical properties. At 1950 ℃, SiC ceramic with a density of 99% exhibits Young's modulus, hardness, and flexural strength of 476 MPa, 28.3 GPa, and 334 MPa, respectively. It is found that long holding time has a positive effect on the uniformity of the microstructure and density distribution of SiC ceramics with large thickness/diameter ratios. Additionally, the sintering additive of boron can solid-solve into SiC, and then facilitate the phase transformation of SiC to form 6H-SiC and 4H-SiC composite ceramics.

关键词： SiC large thickness/diameter ratios mechanical properties uniformity

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Spallation Damage Mechanisms and Microstructural Evolution in Selective Laser Melted Ti-6al-4v Under Quasi-Isentropic Loading

SSRN

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SSRN 2024年

作者： Zhang, Kaichang Li, Peibo Zhang, Yang Sun, Yi Luo, Guoqiang Shen, Qiang Hubei Longzhong Laboratory Hubei Xiangyang441000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

The microstructure of additively manufactured Ti-6Al-4V significantly differs from that of traditional casting processes, and this microstructural variation directly impacts the material's mechanical properties. To ensure the safety and stability of additively manufactured Ti-6Al-4V in practical applications, this study achieves controlled dynamic loading by optimizing the cross-sectional surface density of the structural gradient flyer(SGFs). It further explores material response characteristics under varying stress and strain rates by adjusting the loading rate in spallation experiments. The initial microstructure of Ti-6Al-4V produced via selective laser melting (SLM) was investigated and analyzed. Quasi-isentropic loading experiments were conducted on 6 mm thick samples at strain rates ranging from 5.07 to 12.38 × 104 s-1. The results demonstrate that, in comparison to as-cast alloys, the SLM-processed Ti-6Al-4V alloys exhibit reduced plasticity, primarily attributed to the higher cooling rates of SLM. The alloys predominantly display brittle fracture characteristics, with distinct transgranular fracture patterns. As the loading strain rate increases, the pulse width of the loading waveform progressively narrows, spall strength markedly rises, and cracks not only propagate but also enlarge. Grain refinement was evident in both the crack extension region and along the edges, accompanied by localized stress concentration, yet no signs of recrystallization were detected. The spall strength of the material exhibited heightened sensitivity to impact stresses relative to plate impact conditions. These findings offer critical theoretical insights into the potential applications of additively manufactured titanium alloys, particularly in aerospace and defense sectors. © 2024, The Authors. All rights reserved.

关键词： Grain refinement

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High-pressure Sintering of Boron Carbide-Titanium Diboride Composites and Its Densification Mechanism

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Journal of Wuhan University of technology(materials Science) 2020年第2期35卷 356-362页

作者： GAO Jiancheng WANG Dangqiang LEI Liwen ZHANG Fan ZHANG Jinyong FU Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

A high-pressure hot-pressing process was applied to densify a commercial boron carbide-titanium diboride (B4C-TiB2) powder *** fully dense (98.6%) materials were obtained at 1700℃ under a pressure of *** to the sintering temperature required to achieve similar results when a pressure of only 30MPa was applied,the sintering temperature was found to decrease by about 200℃ under pressure of 100 *** of the thermodynamics and microstructure showed that the plastic deformation of the B4C grains induced by high pressure dominated the densification mechanism when high pressure was ***,higher pressure resulted in remarkably improved mechanical properties of the composites,which could be traced back to the generation of stacking faults in the B4C grains and aggregation of TiB2.

关键词： hot-pressing high-pressure sintering densification TiB2-B4C

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Spall Strength and the Study of Damage Mechanism of Pure-Al in Different Wave Systems

SSRN

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SSRN 2025年

作者： Zhang, Yang Sun, Yi Li, Peibo Zhang, Kaichang Zhao, GuiNan Luo, Guoqiang Shen, Qiang Hubei Longzhong Laboratory Hubei Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Qingdao University of Science and Technology China

To study the structural damage behavior of pure-Al under various shock wave profiles, this paper investigates the target using a light gas gun-driven density gradient material and a homogeneous material. It also conducts structural characterization and failure analysis of the postmortem target. The results indicate that spall strength increases with peak stress. At a strain rate of 103 s−1, the spall strength of the gradient material (approximately 0.502 GPa) is significantly higher than that of the homogeneous material (about 0.157 GPa). This difference is attributed to the temperature softening effect in the homogeneous material. The peak stress of the gradient material impacting pure Al is higher, leading to an increase in small-angle grain boundaries and a phenomenon of grain refinement. Here, the structural damage is primarily influenced by stress effects, resulting in higher spall strength. In contrast, the homogeneous material impacting pure Al exhibits a notable temperature rise, which significantly affects structural damage, making it more susceptible to the formation of pores and cracks, thus resulting in lower spall strength. Furthermore, there are differences in pore morphology under various wave regimes: the pores in the gradient material are elliptical, with the long axis perpendicular to the impact direction, while the pores in the homogeneous material are irregularly shaped. Additionally, the gradient material exhibits multiple spallation surfaces, whereas the homogeneous material shows only one spallation surface. By explaining the damage mechanisms of pure Al under different wave systems, this study aims to provide insights and guidance on the spallation behavior of aluminum matrix composites under complex conditions. © 2025, The Authors. All rights reserved.

关键词： Grain refinement

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引入共价型氮化钒来提高氮掺杂碳的亲电性以促进氧还原反应

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Science China materials 2023年第1期66卷 160-168页

作者：李士栋庄泽超夏力学朱杰鑫刘子昂贺汝涵罗雯黄文忠石长玮赵焱周亮 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Chemistry Tsinghua UniversityBeijing 100084China State Key Laboratory of Silicate Materials for Architectures International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China

氮掺杂碳(NC)是一种有潜力的氧还原反应(ORR)电催化剂.氮掺杂碳可直接作为ORR活性位点中心,优化氮原子的电子结构对催化活性具有很大影响.本文通过简单的物理混合和煅烧处理,构建了一种由氮化钒(VN)纳米颗粒为核、“铠甲状”NC作为壳的... 详细信息

氮掺杂碳(NC)是一种有潜力的氧还原反应(ORR)电催化剂.氮掺杂碳可直接作为ORR活性位点中心,优化氮原子的电子结构对催化活性具有很大影响.本文通过简单的物理混合和煅烧处理,构建了一种由氮化钒(VN)纳米颗粒为核、“铠甲状”NC作为壳的新型VN@NC纳米复合材料.得益于纳米线独特的核@壳结构和优化的电子结构,与纯NC和体相VN相比,所制备的VN@NC展现出更优异的ORR活性(起始电位:0.93 V).VN的引入诱导了电荷从NC上的氮原子转移到VN上的钒原子,增加了NC上氮原子的亲电性,从而优化了对含氧中间体的吸附过程.VN@NC也展现出了良好的循环稳定性(四万秒测试后,电流密度保持率为89%).本研究揭示了调节NC中氮原子电子结构的重要性,并为构建NC基复合型电催化剂提供了有效方法.

关键词：亲电性氧还原反应电催化剂氮化钒物理混合氮掺杂碳壳结构循环稳定性

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Static Yield Stress of Cement-based Grouting material under Different Rheological Modes

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Journal of Wuhan University of technology(materials Science) 2022年第5期37卷 948-952页

作者： NAN Xueli CHEN Hao LI Rongyang JI Jianrui WANG Yi TANG Weibin School of Material Science and Engineering Lanzhou University of TechnologyLanzhou730050China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou730050China Gansu Province Transportat Planning Survey and Design Institute Co.LtdLanzhou730000China

To quantitatively estimate the workability of cement-based grouting material,from the perspective of rheology,the result of the static yield stress evaluated using the rate-controlled and stress-controlled modes,respectively,was compared using the Rheowin ***,the correlation of workability and solid concentration of slurry with static yield stress was *** show that the static yield stress of cement-based grouting slurry relates to the established slurry structure,and is the shear stress corresponding to the transformation of elastics to plastics;In rate-controlled mode,the static yield stress of the slurry is related to the shear *** higher the shear rate,the greater the yield stress of the *** the stress-controlled mode,the result is more accurate and suitable for testing static yield stress under different water-cement *** the water-cement ratio has a good correspondence with the static yield stress and the static yield stress has a good correspondence with the slump flow of the slurry,the static yield stress is the minimum stress to be overcome when the slurry begins to flow and it reflects the yield behavior and structural stability of the cement.

关键词： shear mode stress-controlled mode static yield stress solid concentration

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Design Engineering,synthesis Protocols,and Energy Applications of MOF-Derived Electrocatalysts

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Nano-Micro Letters 2021年第9期13卷 16-47页

作者： Amr Radwan Huihui Jin Daping He Shichun Mu School of Science Wuhan University of TechnologyWuhan 430070People’s Republic of China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China

The core reactions for fuel cells,rechargeable metal-air batteries,and hydrogen fuel production are the oxygen reduction reaction(ORR),oxygen evolution reaction(OER),and hydrogen evolution reaction(HER),which are heavily dependent on the efficiency of *** attempts have previously been devoted in non-noble electrocatalysts born out of metal-organic frameworks(MOFs)for ORR,OER,and HER applications,due to the following advantageous reasons:(i)The significant porosity eases the electrolyte diffusion;(ii)the supreme catalyst-electrolyte contact area enhances the diffusion efficiency;and(iii)the electronic conductivity can be extensively increased owing to the unique construction block subunits for MOFs-derived ***,the recent progress of MOFs-derived electrocatalysts including synthesis protocols,design engineering,DFT calculations roles,and energy applications is discussed and *** can be concluded that the elevated ORR,OER,and HER performances are attributed to an advantageously well-designed high-porosity structure,significant surface area,and plentiful active ***,the perspectives of MOF-derived electrocatalysts for the ORR,OER,and HER are presented.

关键词： MOF-derived electrocatalysis Oxygen reduction reaction Oxygen evolution reaction Hydrogen evolution reaction

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Taming the Anchor and Conversion of Polyselenides with a Self-Reinforcing Host in Lithium–Selenium Batteries

SSRN

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SSRN 2024年

作者： Li, Hongyan Dong, Wen-Da Cao, Yueqiang Barakat, Tarek Laboureur, Marvin Ran, Mao-Jin Hu, Zhi-Yi Zhang, Hongxian Jin, Cheng-Bin Li, Yu Su, Bao-Lian College of Materials and Chemistry China Jiliang University Hangzhou310018 China University of Namur NamurB-5000 Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430074 China State Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai200237 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing China

Energy-dense lithium–selenium (Li–Se) batteries have attracted increasing attention, while their practical application is still hindered, highly relating to the volume expansion and low conductivity of Se and shuttle of Li polyselenides (LiPSes). Herein, a concurrent anchoring/converting strategy is proposed to restrain the dissolution and realize the rapid conversion of LiPSes. A prototypical regulator comprises of polar catalysts embedded in the interconnected porous muti-walled carbon network (i.e., CoSnO3 nanocubes/CNTs), which promises fast electron/ion transportation and inhibits volumetric effect. Moreover, CoSnO3 as redox accelerator promotes the bidirectional conversion of polyselenides by chemical adsorption and decreasing the reaction energy barrier. Consequently, the self-reinforcing optimized cathode exhibits superior initial capacity of 730 mAh g−1, greatly enlarged capacity after 200 cycles (increase by ~32%), and superior rate capacity (153 mAh g−1 at 2 C). This work uncovers the roles of electronic/ionic conductivity and adsorption/catalysis in Li–Se batteries, providing a guidance for taming the utilization and kinetics of cathode from material perspectives. © 2024, The Authors. All rights reserved.

关键词： Adsorption

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