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Fabrication and characterization of novel meso-porous carbon/n-octadecane as form-stable phase change materials for enhancement of phase-change behavior

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Journal of Materials Science & Technology 2019年第5期35卷 939-945页

作者： Yurong Liu Yongpeng Xia Kang An Chaowei Huang Weiwei Cui Sheng Wei Rong Ji Fen Xu Huanzhi Zhang Lixian Sun School of Material Science & Engineering Guilin University of Electronic Technology Guilin 541004 China Guangxi Key Laboratory of Information Materials and Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials Guilin University of Electronic Technology. Guilin 541004 China

In this study, series of novel composite phase change materials(PCMs) were prepared through vacuum impregnation by using meso-porous carbon as a supporting matrix and n-octadcane as PCMs.The meso-porous carbon material was prepared through one-pot co-assembly method, using resorcinol and formaldehyde as carbon precursor, tetraethoxysilane as silica sources and triblock copolymer F127 as a template. And the phase behaviors of n-octadcane confined in the nano-porous structure of the meso-porous carbon were further investigated. Fourier transform-infrared spectroscopy spectra show that n-octadecane was effectively encapsulated in the porous structure of mesoporous carbon and the composite PCMs were successfully prepared. Differential scanning calorimetry results confirm that the composite PCMs possess a good phase change behavior, fast thermal-response rate and excellent thermal cycling stability. In addition, the composite PCMs possess expected heat storage and heat release properties. All these results demonstrate that the composite PCMs possess good comprehensive property so that they can be used widely in energy storage systems.

关键词： Phase change materials Meso-porous carbon Microstructure Thermal performance

Remarkable catalysis of spinel ferrite XFe2O4(X=Ni,Co,Mn,Cu,Zn)nanoparticles on the dehydrogenation properties of LiAlH_(4):An experimental and theoretical study

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Journal of Materials Science & Technology 2022年第16期111卷 189-203页

作者： Sheng Wei Jiaxi Liu Yongpeng Xia Huanzhi Zhang Riguang Cheng Lixian Sun Fen Xu Pengru Huang Federico Rosei Aleskey A.Pimerzin Hans Jüergen Seifert Hongge Pan School of Material Science&Engineering Guangxi Key Laboratory of Information Materials and Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsGuilin University of Electronic TechnologyGuilin 541004China School of Mechanical&Electrical Engineering Guilin University of Electronic TechnologyGuilin 541004China CentreÉnergie Matériaux et TélécommunicationsInstitut National de la Recherche Scientifique1650 Boul.Lionel BouletVarennesJ3×1S2QuébecCanada Samara State Technical University Samara443100Russia Institute for Applied Materials Karlsruhe Institute of TechnologyHermann von Helmholtz Platz 176344 Eggenstein LeopoldshafenGermany School of New Energy Science and Technology Xi’an Technological UniversityXi’an 710021China

Safe,compact,lightweight and cost-effective hydrogen storage is one of the main challenges that need to be addressed to effectively deploy the hydrogen economy.LiAlH_(4),as a solid-state hydrogen storage material,presents several advantages such as high hydrogen storage capacity,low price and abundant sources.Unfortunately,neither thermodynamic nor kinetic properties of dehydrogenation for LiAlH_(4)can fulfill the requirements of practical application.Thus,a series of spinel ferrite nanoparticles such as XFe_(2)O_(4)(X=Ni,Co,Mn,Cu,Zn,Fe)were prepared by using the modified thermal decomposition method,and then doped into LiAlH_(4)by using ball milling.Our results show that LiAlH_(4)doped with 7 wt%NiFe_(2)O_(4)starts to release hydrogen at 69.1°C,and the total amount of hydrogen released is 7.29 wt%before 300°C.The activation energies of the two-step hydrogen release reactions of LiAlH_(4)doped with 7 wt%NiFe_(2)O_(4)are 42.32 kJ mol^(-1)and 71.42 k J mol,which are 59.0%and 63.6%lower than those of as-received LiAlH_(4),respectively.Combining the density functional theory(DFT)calculations,we reveal that both the presence of Ni FeOand in-situ formed AlNiin ball-milling decrease the desorption energy barrier of Al-H bonding in LiAlH_(4)and accelerate the breakdown of Al-H bonding through the interfacial charge transfer and the dehybridization of the Al-H cluster.Thus,the experimental and theoretical results open a new avenue toward designing high effective catalysts applied to LiAlH_(4)as a candidate for hydrogen storage.

关键词： Hydrogen storage Lithium aluminum Spinel ferrite nanoparticles

Guanine-assisted N-doped ordered mesoporous carbons as efficient capacity decaying suppression materials for lithium–sulfur batteries

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Journal of Materials Science & Technology 2022年第6期101卷 155-164页

作者： Riguang Cheng Yanxun Guan Yumei Luo Chenchen Zhang Yongpeng Xia Sheng Wei Mengmeng Zhao Qi Lin Hao Li Shiyou Zheng Federico Rosei Lixian Sun Fen Xu Hongge Pan School of Material Science&Engineering Guangxi Key Laboratory of Information Materials and Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsGuilin University of Electronic TechnologyGuilin 541004China School of Mechanical&Electrical Engineering Guilin University of Electronic TechnologyGuilin 541004China School of Material Science&Engineering University of Shanghai for Science&TechnologyShanghai 200093China CentreÉnergie Matériaux et TélécommunicationsInstitut National de la Recherche Scientifique1650 Boul.Lionel BouletVarennesJ3×1S2QuébecCanada School of New Energy Science and Technology Xi’an Technological UniversityChina

Lithium–sulfur(Li–S)batteries are considered promising next-generation energy storage devices due to their high weight capacities and theoretical energy densities,which are significantly higher than those of conventional lithium-ion batteries.However,the sulfur cathode presents two major drawbacks,specifically low specific capacity caused by the poor electrical conductivities of the active materials and fast capacity decay caused by polysulfide dissolution/shuttling.Herein,a high-rate and high-stability dendritic material consisting of N-doped ordered mesoporous carbons(NOMCs)was successfully synthesized via a facile and low-cost calcination method.The highly ordered mesoporous carbon skeleton limited the growth of the sulfur nanofiller within its channels and provided the necessary electrical contact with the insulating sulfur.Furthermore,N-doped heteroatoms presented strong binding sites for trapping polysulfide intermediates,achieving high electrochemical activity,which promoted polysulfide conversion reactions.As a result,the prepared NOMC-2/S cathode material with 1.2-1.5 mg cm^(-2)of sulfur displayed excellent electrochemical performance with a high-rate capability of 460.5 m Ah g^(-1)at 1 C,a high specific capacity of 530.9 m Ah g^(-1)after 200 cycles at 0.1 C,and a decay rate of~0.19%per cycle.

关键词： Lithium–sulfur batteries N-doped ordered mesoporous carbons Electrochemistry

Preparation and thermal properties of novel composite solid-solid phase change materials with a graphene-induced lamellar structure

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Preparation and thermal properties of novel composite solid-...

Design and synthesis of novel microencapsulated phase change materials with a boron nitride reinforced shell for enhancement of thermal conductivity and thermal stability

中国化学会第十九届全国化学热力学和热分析学术会议

作者： Yongpeng Xia Lixian Sun Fen Xu Huanzhi Zhang Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology

In this study,a series of novel polymeric SSPCM were successfully synthesized using polyethylene glycol（PEG） as the phase change ingredient,MDI as the cross-linking agent and graphene oxide（GO） as the skeleton material.TEM and SEM images reveal that the novel SSPCMs possess a regular lamellar structure consisted by the graphene nanosheets and PEG were homogeneously intercalated into the sheets through self-assembly of functional groups.DSC curves indicate that the synthesized SSPCMs possess high phase change enthalpies which are almost equal to those of pure PEG.Furthermore,the phase-change temperatures and latent heats of the SSPCMs have little change after 100 thermal cycles,displaying a good thermal cycling stability.Moreover,both PXRD and in-suit XRD further confirm that the SSPCMs maintain the same crystal structure with pure PEG which ensures the SSPCMs with good phase change behaviors.Thermal conductivity confirms that the highly thermal conductive graphene sheets effectively enhance the thermal conductivity of the SSPCMs and supply them with a fast thermal-responsive rate.In a word,the prepared SSPCMs with high phase change latent heat have great potential applications in thermal energy storage.

关键词： solid-solid phase change materials polyethylene glycol graphene oxide thermal performance

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Design and synthesis of novel microencapsulated phase change...

Biomass Homogeneity Reinforced Carbon Aerogels Derived Functional Phase-Change Materials for Solar–Thermal Energy Conversion and Storage

中国化学会第十九届全国化学热力学和热分析学术会议

作者： Weiwei Cui Yongpeng Xia Huanzhi Zhang Fenxu Lixian Sun Guilin University of Electronic Technology

Novel microencapsulated phase change materials（micro-PCMs） with enhanced thermal conductivity was successfully prepared through in-situ polymerization method.Boron nitride（BN） was utilized as a nano-reinforced agent in the shell materials to enhance the thermal conductivity of micro-PCMs.The comprehensive performances of the micro-PCMs were investigated by scanning electron microscopy（SEM）,Fourier transformation infrared spectroscope（FT-IR）,X-ray photoelectron spectroscopy（XPS）,elementary analyzer（EA）,X-ray diffraction（XRD）,differential scanning calorimeter（DSC） and thermogravimetric analysis（TGA）.The XPS results show that boron nitride was successfully added in micro-PCMs.DSC analysis indicates that the latent heat of the micro-PCMs enhanced by BN composite can reach 145.5 J/g.And the thermal conductivity of micro-PCMs increased by 29.76% compared with that of micro-PCMs without boron nitride.Moreover,the novel micro-PCMs revealed a good thermal stability after 40 thermal cycles.These results indicate that the novel micro-PCMs have a great potential for thermal energy storage.

关键词： microcapsules phase change materials thermal conductivity boron nitride

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Energy & Environmental Materials 2023年第1期6卷 164-176页

作者： Qingfeng Zhang Tingfeng xia Qihan Zhang Yucao Zhu Huanzhi Zhang Fen Xu Lixian Sun xiaodong Wang Yongpeng Xia xiangcheng Lin Hongliang Peng Pengru Huang Yongjin Zou Hailiang Chu Bin Li School of Material Science&Engineering Guilin University of Electronic TechnologyGuilin 541004China Guangxi Key Laboratory of Information Materials Guangxi Collaborative Innovation Center of Structure and property for new energy and materialsGuilin University of Electronic TechnologyGuilin 541004China School of Material Science&Engineering Beijing University of Chemical TechnologyBeijing 100029China

We deviseda functional form stable compositephase-change materials(PCMs)toachieve a three-dimensional(3D)interconnectedporous carbon aerogel structure for encapsulating polyethyleneglycol(PEG).Anovelhomogeneity reinforced carbonaerogel witha well-interconnected porous structure was constructed bycombining a flexible carbonresource from biomass guar gum with hard-brittle carbonfrom polyimide,to overcome severeshrinkage andpoor mechanical performance of traditionalcarbon aerogel.Thesupportingcarbon aerogel-encapsulated PEG produced thenovel composite PCMswithgood structure stability andcomprehensive energy storage performance.Theresults showed thatthecomposite PCMsdisplayed awell-defined 3Dinterconnected structure,and theirenergy storage capacities were 171.5 and169.5 J/g,which changed onlyslightlyafter 100 thermalcycles,andthe compositescould maintainthe equilibrium temperature at50.0−58.1℃ for about 760.3 s.The thermal conductivityofthe compositescould reach0.62 W m^(−1) K^(−1),which effectively enhanced the thermalresponse rate.And thecomposite PCMs exhibited good leakage-proof performance andexcellent light–thermal conversion.The compressive strengthof thecomposite PCMscan improveupto 1.602 MPa.Results indicatethatthisstrategy canbe efficiently usedtodevelop novel composite PCMswithimproved comprehensive thermalperformance and high light–thermal conversion.

关键词： carbon aerogels composite PCMs energy storage capacity solar-thermal conversion

Effect of doped Ni-Bi-B alloy on hydrogen generation performance of Al-InCl3

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Journal of Energy Chemistry 2019年第12期28卷 268-274页

作者： Jun Chen F.Xu L.Sun Kexiang Zhang Yongpeng Xia xiaolei Guo Huanzhi Zhang Fang Yu Erhu Yan Hongliang Peng Pengru Huang Shujun Qiu Cuili xiang Yujie Sun Guangxi Key Laboratory of Information Materials Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsSchool of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004CuangxiChina School of Material Science and Engineering China University of GeosciencesBeijing 100083China

In this work,Ni-Bi-B alloy has been synthesized via chemical synthesis method.A new kind of Al-InCl3-(Ni-Bi-B)composite has been prepared by high energy mechanical ball grinding A1 powder with additives.Results show that the doped Ni-Bi-B alloy can significantly improve the hydrogen generation performance of Al-InCl3 and the catalytic activity is enhanced with the increasing content of Bi in Ni-Bi-B alloy.Under optimal conditions,the hydrogen generation yield and conversion yield of Al-InCl3-(Ni-Bi-B)reached1196.8 mL g^-1 and 100.0%at room temperature,respectively.Mechanism study shows five kinds of active sites,such as the fresh surface/defect of Al particle,Al-AlCl3,Al-In,Al-Bi/B and Al-Ni/B produced during the ball milling process.Their synergistic effect enhances the hydrogen generation performance of AlInCl3-(Ni-Bi-B)remarkably.In general,the proposed Al-InCl3-(Ni-Bi-B)composite is possible to serve as hydrogen generation material for fuel cells.

关键词： Hydrogen generation Al-H2O reaction Al-InCl3 Ni-Bi-B alloy Ball milling

Effects of Rubus parvifolius L. on neuronal apoptosis and expression of apoptosis-related proteins in a rat model of focal cerebral ischemic-reperfusion injury

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Neural Regeneration Research 2008年第7期3卷 742-746页

作者： Lirong Xu Jisheng Wang Huizhi Li Zongyin Qiu Yongpeng Xia Lingyan Ren Department of Pharmaceutical Analysis College of Pharmacy Chongqing Medical University Chongqing 400016 China

BACKGROUND： Studies have shown that the Rubus parvifolius L. （RP） plant extract exhibits protective effects on cerebral ischemia. This effect is reflected in altered ischemic neuronal apoptosis and associated protein expression. OBJECTIVE： To explore the neuroprotective mechanism of RP after cerebral ischemia injury. DESIGN, TIME AND SETTING： Randomized control experiment of cellular, molecular, and protein levels. The experiment was completed at Chongqing Medical University at the School of Pharmacy Laboratories and Basic Medical Institute from October 2005 to January 2006. MATERIALS： Twenty-four adult, male, Wistar rats, weighing （28 ± 20） g. RP extract, which was a product of ethanol extraction, was provided by the Laboratory of Pharmaceutical Analysis, Chongqing Medical University. RP was dissolved in distilled water to a concentration of 10 mg/mL. All rats were randomly assigned into four groups： 5 g/kg RP, 10 g/kg RP, model, and sham-surgery, with 6 rats in each group. METHODS： In the 5 and 10 g/kg RP groups, as well as the model group, the middle cerebral artery was occluded （MCAO） for 60 minutes, resulting in focal cerebral ischemia, followed by reperfusion for 24 hours. Rats in the 5 and 10 g/kg RP groups received 5 and 10 g/kg RP, respectively. The RP treatment group received RP intragastrically （once a day） for 3 days. One hour after the last dose, rats were subjected to MCAO. The same surgical procedure was performed in the sham-surgery group, except the suture was introduced into the external carotid artery, but not advanced. Rats in the model group were subjected to MCAO. The sham-surgery and model groups received intragastrically administered normal saline once per day for 3 days. One hour after the last dose, the rats were subjected to surgery. MAIN OUTCOME MEASURES： TUNEL labeling and immunohistochemical methods were used to investigate changes in neuronal apoptosis and expression of the apoptosis-related proteins, Bax and Bcl-2, on the ischemic hemisphere, as well as the contralateral

关键词： cerebral ischemia/reperfusion apoptosis Bcl-2/Bax

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氘丁苯那嗪治疗氟桂利嗪致锥体外系反应1例

实用药物与临床 2024年第6期27卷 446-448页

作者：董霞于永鹏潍坊医学院山东潍坊261000 青岛大学附属青岛市海慈医院(青岛市中医医院)神经内科中心(山东省中医药重点学科) 山东青岛266000

盐酸氟桂利嗪使用广泛,特别在中老年人群中,服用时间过长,容易出现不可逆的锥体外系副反应。本例患者为73岁女性患者,因反复头痛、头晕服用盐酸氟桂利嗪,3个月后出现口周、舌及双手抖动,伴有不自主咀嚼运动,诊断为“药物性锥体外系反应... 详细信息

盐酸氟桂利嗪使用广泛,特别在中老年人群中,服用时间过长,容易出现不可逆的锥体外系副反应。本例患者为73岁女性患者,因反复头痛、头晕服用盐酸氟桂利嗪,3个月后出现口周、舌及双手抖动,伴有不自主咀嚼运动,诊断为“药物性锥体外系反应”。患者服用氯硝西泮片及苯海索等药物治疗,效果不佳,遂予以服用氘丁苯那嗪,用药1个月后,患者临床症状显著改善,随访1年患者病情稳定。

关键词：氟桂利嗪氘丁苯那嗪锥体外系反应迟发性运动障碍