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Microstructural evolution and performance of hydrogen storage and electrochemistry of Co-added La0.75Mg0.25Ni3.5-xCox（x=0,0.2,0.5 at%） alloys

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Progress in Natural Science:Materials International 2017年第4期27卷 424-429页

作者： Wei Lv Yufan Shi Wanpeng Deng jianguang yuan Youhua Yan Ying Wu China Iron & Steel Research Institute Group Advanced Technology & Materials Co. Ltd

Microstructure, hydrogen storage and electrochemical performances of Co-added La0.75Mg0.25Ni3.5xCox（x = 0,0.2, 0.5 at%） alloys are studied. XRD and rietveld refinement results suggest that the samples are mainly composed of（LaMg）Ni3,（LaMg）2Ni7and LaNi5phases, Co substitution for Ni changes the phase abundance,but not the phase composition. With the rising of Co content, the amount of（LaMg）2Ni7phase decreases, but the amount of LaNi5phase increases, while the amount of（LaMg）Ni3phase firstly increases and then *** alloys reversibly absorb and desorb hydrogen at 298 K smoothly. When Co content is 0.2 at%, the hydrogen absorption capacity reaches the maximum value of 1.14 H/M, and the absorption capacities reach 1.09 H/M and 1.03 H/M in the first minute at 298 K and 323 K, respectively. Electrochemical performance measurement results show that La0.75Mg0.25Ni3.5-xCoxalloys are completely activated within 2 cycles, and the cyclic stability of La0.75Mg0.25Ni3.3Co0.2alloy approaches 63.7% after 100 charge/discharge cycles, which is higher than that(S100= 60%) of La0.75Mg0.25Ni3.0Co0.5alloy. Thus, the La0.75Mg0.25Ni3.3Co0.2alloy exhibits optimum comprehensive properties of hydrogen storage and electrochemistry.

关键词： La-Mg-Ni hydrogen storage alloy Co substitution for Ni Electrochemical property

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

Effect of Mg substitution for La on microstructure, hydrogen storage and electrochemical properties of La1-x Mgx Ni3.5（x=0.20, 0.23, 0.25 at%） alloys

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Progress in Natural Science:Materials International 2016年第2期26卷 177-181页

作者： Wei Lv Yufan Shi Wanpeng Deng jianguang yuan Youhua Yan Ying Wu Beijing Key Laboratory of Energy Nanomaterials Advanced Technology & Materials Co. Ltd China Iron & Steel Research Institute Group

The effect of Mg substitution for La on microstructure, hydrogen storage and electrochemical properties of the annealed La1-xMgxNi3.5（x=0.20, 0.23, 0.25 at%） alloys have been studied. All the samples were mainly composed of（LaMg）2Ni7,（LaMg）Ni3, and LaNi5phases. Mg substitution for La changed the phase abundance, but did not change the constitution of all phases, which is con fi rmed by the results of backscattered SEM images and EDS analysis. The P–C isotherms indicated that the La1-xMgxNi3.5alloys reversibly absorbed and desorbed hydrogen smoothly at 298 K. The hydrogen absorption cyclic stabilities of La1-xMgxNi3.5alloy after 5 hydrogen absorption/desorption cycles reached the maximum values of91.9% and 96.0% at 298 K and 323 K, respectively. The hydrogen desorption capacity and plateau pressure for the La1-xMgxNi3.5alloy reached the maximum values of 1.055 H/M and 0.074 MPa, respectively. The desorption capacities of La1-xMgxNi3.5reached 0.193 H/M and 0.565 H/M in the fi rst minute at 298 K and 323 K, respectively. Electrochemical property measurement indicated that La1-xMgxNi3.5（x=0.20,0.23, 0.25 at%） alloys possessed excellent activation capability and were completely activated within3 cycles. Discharge capacities of La1-xMgxNi3.5alloys reached 378.2 m A h/g（x = 0.20 at%）, 342.7 m A h/g（x = 0.23 at%）, and 369.6 m A h/g（x = 0.25 at%）, respectively. Moreover, energy density of La1-xMgxNi3.5alloy was much larger than that of La0.80Mg0.20Ni3.5 alloy and nearly approaches the maximum value of La0.75Mg0.25Ni3.5. Thus, the La1-xMgxNi3.5alloy exhibits optimum comprehensive properties of hydrogen storage and electrochemistry.

关键词： Hydrogen storage alloy Mg substitution for La Electrochemical property

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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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

Key technology and application of AB_(2) hydrogen storage alloy in fuel cell hydrogen supply system

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Materials Reports(Energy) 2024年第1期4卷 113-122页

作者： Ming Yao jianguang yuan Bao Zhang Youhua Yan Shaoxiong Zhou Ying Wu School of Energy Power and Machinery Engineering North China Electric Power UniversityNo.2 BeinongluChangping DistrictBeijing 102206China Institute of Energy Power Innovation North China Electric Power UniversityNo.2 BeinongluChangping DistrictBeijing 102206China Jiangsu JITRI Advanced Energy&Materials Research Institute Co. LtdNo.5 ChongyinanluXinbei DistrictChangzhou 213000China

At present,there is limited research on the application of fuel cell power generation system technology using solid hydrogen storage materials,especially in hydrogen-assisted *** the disadvantages of low hydrogen storage capacity and poor kinetics of hydrogen storage materials,our primary focus is to achieve smooth hydrogen ab-/desorption over a wide temperature range to meet the requirements of fuel cells and their integrated power generation *** this paper,the Ti_(0.9)Zr_(0.1)Mn_(1.45)V_(0.4)Fe_(0.15) hydrogen storage alloy was successfully prepared by arc *** maximum hydrogen storage capacity reaches 1.89 wt% at 318 *** alloy has the capability to absorb 90% of hydrogen storage capacity within 50 s at 7 MPa and release 90% of hydrogen within 220 *** Multiphysics 6.0 software was used to simulate the hydrogen ab-/desorption processes of the *** flow rate of cooling water during hydrogen absorption varied in a gradient of(0.02 t x)m s^(-1)(x=0,0.02,0.04,0.06,0.08,0.1,0.12).Cooling water flow rate is positively correlated with the hydrogen absorption rate but negatively correlated with the *** the cooling rate is 0.06 m s^(-1),both simulation and experimentation have shown that the hydrogen storage tank is capable of steady hydrogen desorption for over 6 h at a flow rate of 2 L min^(-1).Based on the above conclusions,we have successfully developed a hydrogen-assisted two-wheeler with a range of 80 km and achieved regional demonstration operations in Changzhou and *** paper highlights the achievements of our team in the technological development of fuel cell power generation systems using solid hydrogen storage materials as hydrogen storage carriers and their application in twowheelers in recent years.

关键词： AB_(2)hydrogen storage alloy Hydrogen storage tanks Simulation Hydrogen-electric coupling system Power-assisted two-wheelers

Efficient nanocatalysis of Ni/Sc_(2)O_(3)@FLG for magnesium hydrolysis of hydrogen generation

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Journal of Materials Science & Technology 2024年第8期175卷 235-243页

作者： Haixiang Huang Tingting Xu Jinting Chen Yang Zhao ujie 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

Magnesium is one of the most promising candidates of light metal materials for hydrogen production by hydrolysis due to its efficient and economical *** modification methods have been investigated to improve the hydrolytic properties of ***,the direction of the design of efficient catalysts is unclear and needs to be guided by a richer catalytic mechanism of *** this work,a simple approach was used to synthesize Few Layer Graphene(FLG)-loaded ultra-fine highly dispersed Ni/Sc_(2)O_(3)nanocatalyst,which achieves impressive catalytic hydrolysis ***,the addition of 4 wt%Ni/Sc_(2)O_(3)@FLG catalyst allows Mg to produce 833 mL g^(-1)of H_(2) in 20 s at 30℃.There is an initial hydrogen release rate as high as 5942 mL g^(-1)min^(-1),a final hydrogen yield of 859 mL g^(-1)(99.13%),and almost complete conversion of Mg to Mg(OH)_(2).Furthermore,surprisingly,even with only 0.2 wt%catalysts added,Mg still has an initial hydrogen generation rate of 3627 mL g^(-1)min^(-1),which is over 20 times faster than that of *** also produces 690 mL g^(-1)of H_(2) in 30 s at 30℃.Hydrolysis kinetic curves and microscopic morphology tests show that FLG could shape and hold Mg into thin sheets,giving them an ultra-high hydrolysis rate and conversion *** formation of micro-galvanic cells between Ni and Mg accelerates the electrochemical corrosion of Mg and greatly enhances electron transfer during *** work provides a new strategy for the preparation of efficient nanocatalysts,which is expected to make“Mg-efficient catalyst”the most ideal light metal-based material for hydrogen production by hydrolysis.

关键词： Mg-based materials Hydrolysis Catalyst Hydrogen generation

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

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