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Effect of Cerium on Microstructure and Electrochemical Performance of Ti-V-Cr-Ni Electrode Alloy

Journal of Rare Earths 2007年第3期25卷 341-347页

作者：乔玉卿赵敏寿朱新坚曹广义 State Key Laboratory of Metastable Materials Science and technology Yanshan University Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China institute of fuel cell Shanghai Jiaotong University

Effect of cerium on the microstructure and electrochemical performance of the Ti0.25V0.35-xCexCr0.1Ni0.3（x=0,0.005）electrode alloy was investigated by X-ray diffraction（XRD）,field emission scanning electron microscopy/energy dispersive X-ray spectrometry（FESEM-EDS）,and electrochemical impedance spectroscopy（EIS）*** the basis of XRD and FESEM-EDS analysis,the alloy was mainly composed of V-based solid solution with body-centered-cubic structure and TiNi-based secondary *** did not exist in two phases,instead,it existed as Ce-rich small white particles,with irregular edges,distributed near the grain boundaries of the V-based solid solution *** capacity,cycle stability,and high-rate discharge ability of the alloy electrode were effectively improved with the addition of Ce at 293 *** was very surprising that the charge retention was abnormal with larger discharge capacity after standing at the open circuit for 24 *** indicated that addition of Ce improved the dynamic performance,which caused the charge transfer resistance（RT）to decrease and exchange current density（I0）to increase *** exchange current density of the electrochemical reaction on the alloy surface with Ce addition was about 2.07 and 3.10 times larger than that of the alloy without Ce at 303 and 343 K,*** diffusion coefficient of hydrogen（D）in the bulk alloy electrode decreased with addition of Ce,but it did not decrease so much,and the apparent activation energy（△rH）was far higher than that of the AB5 type alloy.

关键词： electrode alloy solid solution alloy EIS rare earths

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Optimal placement of distributed generation units in distribution systems via an enhanced multi-objective particle swarm optimization algorithm

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第4期15卷 300-311页

作者： Shan CHENG Min-you CHEN Rong-jong WAI Fang-zong WANG College of Electrical Engineering and New energy China Three Gorges University State Key Laboratory of Power Transmission Equipment & System Security and New technology Department of Electrical Engineering and fuel cell Center Yuan Ze University

This paper deals with the optimal placement of distributed generation(DG) units in distribution systems via an enhanced multi-objective particle swarm optimization(EMOPSO) algorithm. To pursue a better simulation of the reality and provide the designer with diverse alternative options, a multi-objective optimization model with technical and operational constraints is constructed to minimize the total power loss and the voltage fluctuation of the power system simultaneously. To enhance the convergence of MOPSO, special techniques including a dynamic inertia weight and acceleration coefficients have been integrated as well as a mutation operator. Besides, to promote the diversity of Pareto-optimal solutions, an improved non-dominated crowding distance sorting technique has been introduced and applied to the selection of particles for the next iteration. After verifying its effectiveness and competitiveness with a set of well-known benchmark functions, the EMOPSO algorithm is employed to achieve the optimal placement of DG units in the IEEE 33-bus system. Simulation results indicate that the EMOPSO algorithm enables the identification of a set of Pareto-optimal solutions with good tradeoff between power loss and voltage stability. Compared with other representative methods, the present results reveal the advantages of optimizing capacities and locations of DG units simultaneously, and exemplify the validity of the EMOPSO algorithm applied for optimally placing DG units.

关键词： Distributed generation Multi-objective particle swarm optimization Optimal placement Voltage stability index Power loss

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An all-metallic nanovesicle for hydrogen oxidation

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National Science Review 2024年第06期 233-242页

作者： Juntao Zhang Lujie Jin Hao Sun Xiaozhi Liu Yujin Ji Youyong Li Wei Liu Dong Su Xuerui Liu Zhongbin Zhuang Zhiwei Hu Qi Shao Xiaoqing Huang State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Xiamen University Innovation Laboratory for Sciences and Technologies of energy Materials of Fujian Province(IKKEM) Key Laboratory for Special Functional Materials of Ministry of Education National &Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology School of Materials Science and EngineeringCollaborative Innovation Center of Nano Functional Materials and Applications Henan University institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials& Devices Soochow University State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences State Key Lab of Organic-Inorganic Composites Beijing University of Chemical Technology Max Planck institute for Chemical Physics of Solids College of Chemistry and Chemical Engineering and Materials Science Soochow University

Vesicle, a microscopic unit that encloses a volume with an ultrathin wall, is ubiquitous in ***, it remains a huge challenge to create its inorganic metal-based artificial counterparts. Here,inspired by the formation of biological vesicles, we proposed a novel biomimetic strategy of curling the ultrathin nanosheets into nanovesicles, which was driven by the interfacial strain. Trapped by the interfacial strain between the initially formed substrate Rh layer and subsequently formed RhRu overlayer, the nanosheet begins to deform in order to release a certain amount of strain. Density functional theory（DFT）calculations reveal that the Ru atoms make the curling of nanosheets more favorable in thermodynamics applications. Owing to the unique vesicular structure, the RhRu nanovesicles/C displays excellent hydrogen oxidation reaction（HOR） activity and stability, which has been proven by both experiments and DFT calculations. Specifically, the HOR mass activity of RhRu nanovesicles/C are 7.52 A mg（Rh+Ru）-1at an overpotential of 50 m V at the rotating disk electrode（RDE） level; this is 24.19 times that of commercial Pt/C(0.31 m A mgPt-1). Moreover, the hydroxide exchange membrane fuel cell（HEMFC） with RhRu nanovesicles/C displays a peak power density of 1.62 W cm-2in the H2-O2condition, much better than that of commercial Pt/C(1.18 W cm-2). This work creates a new biomimetic strategy to synthesize inorganic nanomaterials, paving a pathway for designing catalytic reactors.

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Achieving a novel solvent-free regeneration of LiBH_(4) combining hydrogen storage and production in a closed material cycle

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Journal of Magnesium and Alloys 2023年第5期11卷 1697-1708页

作者： Kang Chen Hao Zhong Liuzhang Ouyang Fen Liu Hui Wang Jiangwen Liu Huaiyu Shao Min Zhu School of Materials Science and Engineering Guangdong Provincial Key Laboratory of Advanced Energy Storage MaterialsSouth China University of TechnologyGuangzhou 510641China China-Australia Joint Laboratory for energy&Environmental Materials Key Laboratory of Fuel Cell Technology of Guangdong ProvinceGuangzhou 510641China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering(IAPME)University of MacaoMacao SARChina

LiBH_(4) has been considered as one of the most promising energy storage materials with its ultrahigh hydrogen capacity,which can supply hydrogen through hydrolysis process or realize hydrogen-to-electricity conversion via anodic oxidation reaction of direct borohydride fuel cells(DBFCs).However,the realization of practical hydrogen applications heavily depends on the effective synthesis of high-purity LiBH_(4) and recycling of the spent fuels(LiBO_(2)·xH_(2)O).The present work demonstrates a convenient and high-efficiency solvent-free strategy for regenerating LiBH_(4) with a maximum yield close to 80%,by retrieving its by-products with MgH_(2) as a reducing agent under ambient ***,the hydrogen released from the regeneration course can completely compensate the demand for consumed MgH_(2).The isotopic tracer method reveals that the hydrogen stored in LiBH_(4) comes from both MgH_(2) and coordinated water bound to LiBO_(2).Here,the expensive MgH_(2) can be substituted with the readily available and cost-effective MgH_(2)-Mg mixtures to simplify the regeneration ***,LiBH_(4) catalyzed by CoCl_(2) can stably supply hydrogen to proton exchange membrane fuel cell(PEMFC),thus powering a portable prototype *** combining hydrogen storage,production and utilization in a closed cycle,this work offers new insights into deploying boron-based hydrides for energy applications.

关键词： Lithium borohydride High-energy ball milling Regeneration Hydrogen production Proton exchange membrane fuel cell

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Improvement on hydrogen generation properties of Zr(BH4)4·8NH3

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Progress in Natural Science:Materials International 2021年第1期31卷 41-46页

作者： D.F.Wu L.Z.Ouyang J.M.Huang J.W.Liu H.Wang X.S.Yang H.Shao M.Zhu School of Materials Science and Engineering Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials South China University of Technology Guangdong Research institute of Rare Metals Guangdong Key Laboratory of Rare Earth Development and Application China-Australia Joint Laboratory for energy & Environmental Materials Key Laboratory of Fuel Cell Technology of Guangdong Province Advanced Manufacturing technology Research Centre Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering (IAPME) University of Macau

Hydrolysis of Zr(BH4)4·8NH3in deionized water can generate high purity hydrogen at room ***, the sluggish hydrolysis kinetics of Zr(BH4)4·8NH3hinders its practical use. To improve its hydrogen generation properties, the effects of magnetic stirring, changing hydrolysis solution and tuning the ammonia coordination number on the hydrolysis properties of Zr(BH4)4·8NH3were investigated. Results show that both changing hydrolysis solution and tuning the ammonia coordination number can enhance the hydrolysis *** hydrolysis kinetics properties of Zr(BH4)4·8NH3were significantly improved in MgCl2and *** Zr(BH4)4·8NH3(x ≤ 8) samples were synthesized by a ball-milling method with different ammonization time(10, 60 and 180 min). Both the hydrolysis kinetics and hydrogen yield of Zr(BH4)4·8NH3(x ≤ 8) were enhanced as the ammonia coordination number(x) decreased. Thus, tuning ammonia coordination number is an effective way to control the hydrolysis properties of Zr(BH4)4·8NH3(x ≤ 8).

关键词： Hydrogen production Zr(BH 4 ) 4 ·8NH 3 Hydrolysis properties Ammonia coordination number

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Enhanced hydrogen generation from hydrolysis of MgLi doped with expanded graphite

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Journal of Magnesium and Alloys 2021年第6期9卷 2185-2193页

作者： Kang Chen Jun Jiang Liuzhang Ouyang Hui Wang Jiangwen Liu Huaiyu Shao Min Zhu School of Materials Science and Engineering Guangdong Provincial Key Laboratory of Advanced Energy Storage MaterialsSouth China University of TechnologyGuangzhou510641China China-Australia Joint Laboratory for energy&Environmental Materials Key Laboratory of Fuel Cell Technology of Guangdong ProvinceGuangzhou510641China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering(IAPME)University of MacaoMacao SARChina

Hydrolysis of Mg-based materials is considered as a potential means of safe and convenient real-time control of H_(2)release,enabling efficient loading,discharge and utilization of hydrogen in portable electronic *** present work,the hydrogen generation properties of MgLi-graphite composites were evaluated for the first *** MgLi-graphite composites with different doping amounts of expanded graphite(abbreviated as EG hereinafter)were synthesized through ball milling and the hydrogen behaviors of the composites were investigated in chloride *** the above doping systems,the 10 wt.%EG-doped MgLi exhibited the best hydrogen performance in MgCl_(2)*** particular,the 22 h-milled MgLi-10 wt.%EG composites possessed both desirable hydrogen conversion and rapid reaction kinetics,delivering a hydrogen yield of 966 mL H_(2)g^(-1)within merely 2 min and a maximum hydrogen generation rate of 1147 mL H_(2)min^(-1)g^(-1),as opposed to the sluggish kinetics in the EG-free ***,the EG-doped MgLi showed superior air-stable ability even under a 75 RH%ambient *** example,the 22 h-milled MgLi-10 wt.%EG composites held a fuel conversion of 89%after air exposure for 72 h,rendering it an advantage for Mg-based materials to safely store and transfer in practical *** similar favorable hydrogen performance of MgLi-EG composites in(simulate)seawater may shed light on future development of hydrogen generation technologies.

关键词： Hydrogen generation MgLi-graphite composites Hydrolysis Air-stable ability

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Intermolecular Acid-Base-Pairs Containing Poly(p-Terphenyl-co-lsatin Piperidinium)for High Temperature Proton Exchange Membrane fuel cells

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energy & Environmental Materials 2024年第3期7卷 406-414页

作者： Xiaofeng Hao Zhen Li Min Xiao Zhiheng Huang Dongmei Han Sheng Huang Wei Liu Shuanjin Wang Yuezhong Meng The Key Laboratory of Low-carbon Chemistry&energy Conservation of Guangdong Province State Key Laboratory of Optoelectronic Materials and TechnologiesSchool of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China School of Chemical Engineering and technology Sun Yat-sen UniversityZhuhai 519000China institute of Chemistry Henan Provincial Academy of SciencesZhengzhou 450000China Research Center of Green Catalysts College of ChemistryZhengzhou UniversityZhengzhou 450001China

How to optimize and regulate the distribution of phosphoric acid in matrix,and pursuing the improved electrochemical performance and service lifetime of high temperature proton exchange membrane(HT-PEMs)fuel cell are significant ***,bifunctional poly(p-terphenyl-co-isatin piperidinium)copolymer with tethered phosphonic acid(t-PA)and intrinsic tertiary amine base groups are firstly prepared and investigated as *** distinctive architecture of the copolymer provides a well-designed platform for rapid proton *** not only transports through the hydrogen bond network formed by the adsorbed free phosphoric acid(f-PA)anchored by the tertiary amine base groups,but also rely upon the proton channel constructed by the ionic cluster formed by the t-PA *** the design of the structure,the bifunctional copolymers with lower PA uptake level(<100%)display prominent proton conductivities and peak power densities(99 mS cm^(-1),812 mW cm^(-2)at 160℃),along with lower PA leaching and higher voltage stability,which is a top leading result in disclosed *** results demonstrate that the design of intermolecular acid-base-pairs can improve the proton conductivity without sacrificing the intrinsic chemical stability or mechanical property of the thin membrane,realizing win-win demands between the mechanical robustness and electrochemical properties of HT-PEMs.

关键词： bifunctional copolymer high temperature proton exchange membrane intermolecular acid-base-pairs phosphonic acid retention phosphonic acid uptake level

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Segmented tomographic evaluation of structural degradation of carbon support in proton exchange membrane fuel cells

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Journal of energy Chemistry 2022年第11期31卷 359-367,I0010页

作者： Jung A.Hong Min-Hyoung Jung Sung Yong Cho Eun-Byeol Park Daehee Yang Young-Hoon Kim Sang-Hyeok Yang Woo-Sung Jang Jae Hyuck Jang Hyo June Lee Sungchul Lee Hu Young Jeong Young-Min Kim Department of energy Science Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea fuel cell Core Parts Development cell Hyundai Mobis Co.Ltd.Uiwang 16082Republic of Korea Electron Microscopy&Spectroscopy Team Korea Basic Science Institute(KBSI)Daejeon 34133Republic of Korea Graduate School of Semiconductor Materials and Devices Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea

The variation of the three-dimensional(3D)structure of the membrane electrode of a fuel cell during proton exchange cycling involves the corrosion/compaction of the carbon *** increasing degradation of the carbon structure continuously reduces the electrocatalytic performance of proton exchange membrane fuel cells(PEM-FCs).This phenomenon can be explained by performing 3D tomographic analysis at the ***,conventional tomographic approaches which present limited experimental feasibility,cannot perform such evaluation and have not provided sufficient structural information with statistical significance thus ***,a reliable methodology is required for the 3D geometrical evaluation of the carbon ***,we propose a segmented tomographic approach which employs pore network analysis that enables the visualization of the geometrical parameters corresponding to the porous carbon structure at a high *** approach can be utilized to evaluate the 3D structural degradation of the porous carbon structure after cycling in terms of local surface area,pore size distribution,and their 3D *** geometrical parameters of the carbon body were demonstrated to be substantially reduced owing to the cycling-induced *** information enables a deeper understanding of the degradation phenomenon of carbon supports and can contribute to the development of stable PEM-FC electrodes.

关键词： Electron tomography fuel cell Proton exchange membrane Membrane electrode assembly Carbon corrosion

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Sintering of Ce_(0.8)Sm_(0.2)O_(1.9)

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Journal of Rare Earths 2007年第3期25卷 364-367页

作者：高瑞峰毛宗强 institute of Nuclear and New energy technology Tsinghua University

Ce0.8Sm0.2O1.9（SDC）powder was prepared with an oxalate coprecipitation *** solid solutions were sintered at various temperatures ranging from 1100~1450 ℃,and characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,density measurements,and electrical conductivity *** optimized processing parameters for densification were to uniaxially press the sample at 200~400 MPa and sinter it at 1350~1400 ℃ for 4 *** density of the sintered pellets was 〉90% of the theoretical density;their soakage was 〈0.5%;and the average grain size was 1~2 μ*** conductivities of the typical sintered specimen were 0.0133 and 0.0211 S·cm-1 at 550 and 600 ℃,respectively;Its activation energy for ionic conductivity was 0.62 *** dense SDC bulk material could be used as the electrolyte layer of low temperature solid oxide fuel cells.

关键词： Sm doped ceria coprecipitation oxygen ion conductor sintering solid oxide fuel cell rare earths

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Editorial for the special issue“Hydrogen energy Production,Storage and Utilization”

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Materials Reports(energy) 2024年第1期4卷 1-2页

作者： Lixian Sun Guest Editor Guilin University of Electronic technology China

Hydrogen energy has emerged as a significant energy source for accomplishing energy transformation and achieving carbon *** production,storage and transportation are the key technologies to realize hydrogen energy application and carbon neutralization *** from the mature technologies of fossil fuel reforming and water electrolysis,new hydrogen production methods(such as solar photolysis,biomass conversion,thermochemical circulation,etc.)have garnered widespread attention and research *** lack of safe and efficient hydrogen storage and utilization technology for hydrogen fuel cell systems is the major obstacle to achieving hydrogen *** the past decades,global researchers have conducted extensive studies on enhancing the hydrogen storage performance of materials,such as alloy,metal hydride,complex hydride,carbon-based materials,etc.,as well as the technological development of fuel cell power generation systems using solid hydrogen storage materials as hydrogen storage *** themed issue entitled“Hydrogen energy Production,Storage and Utilization”includes 10 carefully selected papers that address the most recent developments in hydrogen production and storage materials,involving catalyst design,structure characterization,hydrogen ab-/desorption performance and mechanism,and fuel cell coupling system exploit.

关键词： alloy Storage hydride

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