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轮胎研究与开发 1995年第2期21卷 36-37页

作者： bogu.,ed 邓海燕

Utlra-fast hydrolysis performance of MgH2 catalyzed by Ti-Zr-Fe-Mn-Cr-V high-entropy alloys

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Journal of Energy Chemistry 2024年第11期 77-86页

作者： Jinting Chen Tingting Xu Zeyu Zhang Jinghan Zhang Haixiang Huang bogu.Liu Yawei Li Jianguang Yuan Bao Zhang Ying Wu School of Energy Power and Mechanical Engineering North China Electric Power University Institute of Energy Power Innovation North China Electric Power University

Hydrogen energy is one of the ideal energy alternatives and the upstream of the hydrogen industry chain is hydrogen production,which can be achieved via the reaction of inorganic materials with water,known as *** inorganic materials,the high hydrogen capacity for hydrolysis of MgH2（15.2 wt%）makes it a promising material for hydrogen production via ***,the dense Mg（OH）2passivation layer will block the reaction between MgH2and the solution,resulting in low hydrogen yield and sluggish hydrolysis *** this work,the hydrogenyield and hydrogen generation rate of MgH2are considerably enhanced by adding Ti-Zr-Fe-Mn-Cr-V high-entropy alloys（HEAs） for the first *** *** MgH2-3 wt% TiZrFe1.5MnCrV0.5(labelled as MgH2-3 wt% Fe1.5) composite releases 1526.70 mL/g H2within 5 min at 40℃,and the final hydrolysis conversion rate reaches 95.62% within 10 *** mean hydrogen generation rate of the MgH2-3 wt% Fe1.5composite is 289.16 mL/g/min,which is 2.38 times faster than that of pure ***,the activation energy of the MgH2-3 wt% Fe1.5composite is calculated to be 12.53 kJ/mol. The density functional theory（DFT） calculation reveals that the addition of HEAs weakens the Mg-H bonds and accelerates the electron transfer between MgH2and HEAs,Combined with the cocktail effect of HEAs as well as the formation of more interfaces and micro protocells,the hydrolysis performance of MgH2is considerably *** work provides an appealing prospect for real-time hydrogen supply and offers a new effective strategy for improving the hydrolysis performance of MgH2.

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Catalytic mechanism of in-situ Ni/C co-incorporation for hydrogen absorption of Mg

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Journal of Magnesium and Alloys 2023年第5期11卷 1815-1824页

作者： bogu.Liu Bao Zhang Haixiang Huang Xiaohong Chen Yujie Lv Zhongyu Li Jianguang Yuan Ying Wu Central Iron&Steel Research Institute Advanced Technology&Materials Co.LtdNo.76 XueyuannanluHaidian DistrictBeijing 100081China Advanced Materials Research Institute North China Electric Power UniversityNo.2 Beinonglu Changping DistrictBeijing 102206China

Ni and carbon materials exhibit remarkable catalysis for the hydriding reaction of *** the underlying mechanism of Ni/C hybrid catalysis is still *** this work,density functional theory(DFT)calculation is applied to investigate the effect of Ni/C co-incorporation on the hydriding reaction of Mg *** morphology and crystal structure of the Ni/C co-incorporated Mg sample show that the coincorporated structure is *** transition state searching calculation suggests that both the incorporations of Ni and C are beneficial for the H_(2) *** Ni atom has a dramatic improvement for H_(2) dissociation and makes the H diffusion become limiting step of the hyriding *** Ni dz_(2)orbit and H s orbit accept the electrons and combine together compactly,while the Ni d_(xy) orbit is *** catalytic effect of Ni on H_(2) dissociation can be ascribed to the bridging effect of Ni d_(xy) *** incorporation of C can weaken the over-strong interaction between Ni and H which hindered the H diffusion on Mg(0001).The Ni/C co-incorporated Mg(0001)shows the best performance during hyriding reaction compared with the clean and single incorporated Mg(0001).

关键词： Magnesium Ni/C co-incorporation Density functional theory Catalytic effect Hydriding reaction

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激光修复中的若干关键问题及常用检测技术

力学与实践 2024年第2期46卷 250-263页

作者：石文雄王新峰郭峰莫斯睿肖博古谢惠民何巍中航西安飞机工业集团股份有限公司西安710089 湖南大学机械与运载工程学院长沙410082 清华大学航天航空学院北京100084

作为金属增材制造的重要分支,激光修复技术是装备再制造等战略性新兴产业的核心技术之一,已在航空航天、国防装备等关键领域获得推广应用。研究结果表明应力、应变场的演化与成型后修复体的缺陷分布、几何形貌等紧密相关,是决定修复质... 详细信息

作为金属增材制造的重要分支,激光修复技术是装备再制造等战略性新兴产业的核心技术之一,已在航空航天、国防装备等关键领域获得推广应用。研究结果表明应力、应变场的演化与成型后修复体的缺陷分布、几何形貌等紧密相关,是决定修复质量的关键因素之一。相关参量的在线测量与表征是工业界和学术界广泛关注的重要问题,然而激光修复过程复杂、测量环境恶劣,传统检测方法和技术难以直接应用,迫切需要发展适用于激光修复工程的检测新技术。目前,与激光修复过程相匹配的原位监测手段仍然较为匮乏,对此本文调研分析了激光修复中的关键问题、常用检测技术的优点和所面临的挑战,并进行了展望,可为激光修复工艺研究提供有益借鉴。

关键词：激光修复残余应力无损检测

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A highly efficient hydrolysis of MgH_(2)catalyzed by NiCo@C bimetallic synergistic effect

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Journal of Materials Science & Technology 2023年第6期137卷 176-183页

作者： Yang Zhao Tong Li Haixiang Huang Tingting Xu bogu.Liu Bao Zhang Jianguang Yuan Ying Wu School of Energy Power and Mechanical Engineering North China Electric Power University.No.2 Beinonglu Changping DistrictBeijing 102206China Institute of Energy Power Innovation North China Electric Power UniversityNo.2 Beinonglu Changping DistrictBeijing 102206China

MgH_(2)has a high theoretical hydrogen production capacity and mild conditions for hydrogen production by hydrolysis,so it is suitable as an ideal hydrogen source for fuel ***,with the progress of the hydrolysis reaction,MgH_(2)is impeded from reacting further by the continuous deposition of magnesium hydroxide on its surface,resulting in low hydrogen yield and slow reaction *** the present work,a highly efficient NiCo bimetallic synergistic catalysis is developed to improve the hydrolysis performance of MgH_(2).The MgH_(2)-8 wt%NiCo@C composite ball-milled for 5 h achieves nearly 100%hydrogen desorp-tion efficiency within 15 min in 0.05 mol L^(-1)MgCl_(2)*** the interaction between Ni and Co on the surface of MgH_(2)can form a channel for rapid hydrogen evolution,which hinders the continuous formation of the Mg(OH)_(2)passivation layer and promotes the hydrolysis reaction of MgH_(2).This is very important for the implementation of MgH_(2)hydrolysis to produce hydrogen in the future.

关键词： MgH_(2) Hydrogen generation Hydrolysis NiCo bimetallic catalysts Reaction kinetics

Influence of heat exchanger structure on hydrogen absorption-desorption performance of hydrogen storage vessel

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Progress in Natural Science:Materials International 2022年第5期32卷 617-624页

作者： Jianguang Yuan Ming Yao Baozhou Zhao Yujie Lv Haixiang Huang Jinting Chen bogu.Liu Bao Zhang Ying Wu Institute of Energy Power Innovation North China Electric Power University Jiangsu JITRI Advanced Energy & Materials Research Institute Co. Ltd. School of Energy Power and Machinery Engineering North China Electric Power University Institute of Biomedical Engineering and Health Sciences School of Pharmacy & School of Medicine Changzhou University

The influence of heat exchanger structure on hydrogen absorption-desorption performance of hydrogen storage vessel was studied, in which the AB5(La0.25Ce0.75Ni4.4Al0.1Mn0.1Co0.4) hydrogen storage alloy was used as a typical representative. In order to obtain the data on reaction enthalpy, the PCT curve of the alloy was measured with three different temperatures, and the linear fitting was carried out according to the Van’t Hoff relation *** SMCR(Spiral-mini-channel Reactor) reactor structure was adopted. The heat transfer method and its simplified model were studied by finite element method to explore the effect of size of heat transfer structure,particularly for heat pipe diameter, on the hydrogen absorption-desorption performance of hydrogen storage alloy in the vessel.

关键词： Hydrogen storage materials AB5 alloy Heat exchanger Hydrogen absorption-desorption performance Hydrogen storage vessel

Niobium fluoride-modified hydrogen evolution reaction of magnesium borohydride diammoniate

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Journal of Materials Science & Technology 2023年第25期156卷 197-205页

作者： Yujie Lv Bao Zhang Haixiang Huang bogu.Liu Wei Lv Jianguang Yuan Guanglin Xia Xuebin Yu Dalin Sun Ying Wu School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing102206China Institute of Energy Power Innovation North China Electric Power UniversityBeijing102206China Jiangsu JITRI Advanced Energy & Materials Research Institute Co. Ltd.Changzhou213000China Department of Materials Science Fudan UniversityShanghai200433China

Metal borohydride ammoniates have become one of the most promising hydrogen storage materials due to their ultrahigh ***,their application is still restricted by the high temperature of hydrogen desorption and the release of ***,to promote the dehydrogenation evolution and suppress the ammonia release,different amounts of NbF 5 were introduced into Mg(BH4)2·*** to the pure Mg(BH_(4))_(2)·2NH_(3),the Mg(BH_(4))_(2)·2NH_(3)-NbF_(5) composites exhibit lower onset dehydriding temperatures(53–57℃)and higher dehydriding capacities(5.6 wt.%–8.2 wt.%)at below 200℃,with the complete suppression of *** addition,7.4 wt.%H_(2) could be released from Mg(BH_(4))_(2)·2NH_(3)–5 mol%NbF5 composite at 200℃ within 20 min and the apparent activation energy is calculated to be 60.28 kJ mol^(-1),which is much lower than that of pure Mg(BH_(4))_(2)·2NH_(3)(92.04 kJ mol^(-1)).Mg(BH_(4))_(2)·2NH_(3) should mechanochemically react with NbF5,forming dual-metal(Mg,Nb)borohydride ammoniate and spherical *** introduction of electronegative Nb cation results in-situ formation of(Mg,Nb)borohydride ammoniate towards a lower dehydrogenation temperature and a higher hydrogen release *** increased phase boundaries among the Mg(BH_(4))_(2)·2NH_(3),dual-metal(Mg,Nb)borohydride ammoniate,and MgF2 phases further facilitate the hydrogen diffusion during the dehydrogenation of the composites.

关键词： Hydrogen storage Magnesium borohydride Ammoniates NbF5 Catalysis

Graphene-Supported Sc_(2)O_(3)/TiO_(2) for Superior Catalysis on Hydrogen Sorption Kinetics of MgH_(2)

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Energy Material Advances 2023年第1期4卷 456-466页

作者： Haixiang Huang Jinting Chen Tingting Xu Yujie Lv bogu.Liu Bao Zhang Jianguang Yuan Ying Wu School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China Institute of Energy Power Innovation North China Electric Power UniversityBeijing 102206China

Complex metal oxide catalysts greatly accelerate the hydrogen sorption rates in the magnesium hydride *** this study,the graphene-supported Sc_(2)O_(3)/TiO_(2) catalyst is synthesized by means of a simple method,and a surprisingly synergetic effect of the Sc_(2)O_(3)-TiO_(2) cocatalyst on the hydrogen storage performance of MgH_(2) is *** MgH_(2)-Sc_(2)O_(3)/TiO_(2)@Gn composite starts to release hydrogen at 140°C and reaches the peak dehydrogenation temperature at 239.9°*** absorbs 6.55 wt%of H_(2) in 1 min and desorbs 5.71 wt%of H_(2) in 10 min at 300°C,showing excellent hydrogen absorption and desorption ***,with the decrease of the grain size and changes in the structure,the activity of the catalyst is greatly *** low-valent titanium and scandium and oxygen vacancies formed in the process of dehydrogenation facilitate hydrogen diffusion and electron transfer,and further improve the kinetic performance of the Mg/MgH_(2)-Sc_(2)O_(3)/TiO_(2)@Gn *** study aims to provide insights into studying complex metal oxides as catalysts to improve hydrogen storage performance,and shed light on other catalysis-related research.

关键词： catalyst Kinetics magnesium

Enhanced hydrogen storage properties of NaBH4–Mg(BH4)2 composites by NdF3 addition

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Progress in Natural Science:Materials International 2021年第4期31卷 521-526页

作者： Jianguang Yuan Jinting Chen Haixiang Huang Yujie Lv bogu.Liu Zhongyu Li Bao Zhang Wei Lv Ying Wu Central Iron & Steel Research Institute Advanced Technology & Materials Co. Ltd Jiangsu JITRI Advanced Energy & Materials Research Institute Co. Ltd Advanced Materials Research Institute North China Electric Power University Jiangsu Provincial Key Laboratory of Special Robot Technology Hohai University

As two important members of complex hydrides,Mg(BH4)2and Na BH4have a high gravimetric capacity (14.9 and10.8 wt%,respectively).In this study,the Mg(BH4)2was synthesized by the ion exchange ***,the Mg(BH4)2and Na BH4composites with different amounts (30,40 and 50 wt%) of NdF3were prepared by mechanical *** of the Nd F3on the microstructural evolution and hydrogen storage properties were *** results show that Nd F3catalyst can significantly improve the dehydrogenation kinetics of the eutectic composites of Na BH4–Mg(BH4)*** onset hydrogen desorption temperature of the composites is about88.6C,which is about 110C lower than that of Mg(BH4)2and Na ***(BH4)2–Na BH4-0.5NdF3composites can released 5.2 wt%H2at 250C within 30 min,and the dehydrogenation capacity is significantly higher than that of Mg(BH4)2–Na *** analysis of the dehydrogenation mechanism reveals that NdF3takes participate in the reaction to generate Na MgF3to promote the dehydrogenation reaction process of the composites.

关键词： Hydrogen storage materials Mg(BH4)2 NaBH4 NdF3 Ball-milling Hydrogen desorption performance

A SDUDY OF NEUROPHYSIOLOGICALLY COMPUTATIONAL MODEL FOR SPEECH PRODUCTION

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A SDUDY OF NEUROPHYSIOLOGICALLY COMPUTATIONAL MODEL FOR SPEE...