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Enhanced thermoelectric properties of p-type polycrystalline SnSe by regulating the anisotropic crystal growth and Sn vacancy

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Chinese Physics B 2018年第4期27卷 103-109页

作者： Chengyan Liu Lei Miao Xiaoyang Wang Shaohai Wu Yanyan Zheng Ziyang Deng Yulian Chen Guiwen Wang Xiaoyuan Zhou guangxi key laboratory of information Material Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials School of Material Science and Engineering Guilin University of Electronic Technology Guilin 541004 China College of Physics Chongqing University Chongqing 401331 China

Thermoelectric selenides have attracted more and more attentions ***,p-type Sn Se polycrystalline bulk materials with good thermoelectric properties are *** using the SnSe2 nanostructures synthesized via a wetchemistry route as the precursor,polycrystalline Sn Se bulk materials were successfully obtained by a combined heattreating process under reducing atmosphere and following spark plasma sintering *** a reference,the Sn Se nanostructures synthesized via a wet-chemistry route were also fabricated into polycrystalline bulk materials through the same *** thermoelectric properties of the Sn Se polycrystalline transformed from SnSe2 nanostructures indicate that the increasing of heattreating temperature could effectively decrease the electrical resistivity,whereas the decrease in Seebeck coefficient is nearly *** a result,the maximum power factor is enhanced from 5.06×10^-4W/m·K^2 to 8.08×10^-4W/m·K^2 at 612℃.On the other hand,the reference sample,which was obtained by using Sn Se nanostructures as the precursor,displays very poor power factor of only 1.30×10^-4W/m·K^2 at 537℃.The x-ray diffraction（XRD）,scanning electron microscope（SEM）,x-ray fluorescence（XRF）,and Hall effect characterizations suggest that the anisotropic crystal growth and existing Sn vacancy might be responsible for the enhanced electrical transport in the polycrystalline Sn Se prepared by using SnSe2 *** the other hand,the impact of heat-treating temperature on thermal conductivity is not *** to the boosting of power factor,a high z T value of 1.07 at 612℃ is *** study provides a new method to synthesize polycrystalline Sn Se and pave a way to improve the thermoelectric properties of polycrystalline bulk materials with similar layered structure.

关键词： thermoelectric properties SnSe2 nanostructures polycrystalline SnSe anisotropic crystal growth

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Enhanced hydrogen storage of alanates: Recent progress and future perspectives

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Progress in Natural Science:materials International 2021年第2期31卷 165-179页

作者： Li Zhao Fen Xu Chenchen Zhang Zhenyue Wang Hanyu Ju Xu Gao Xiaoxu Zhang Lixian Sun Zongwen Liu guangxi key laboratory of information materials Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials School of Materials Science and Engineering Guilin University of Electronic Technology School of Chemical and Biomolecular Engineering The University of Sydney The University of Sydney Nano Institute The University of Sydney

The global energy crisis and environmental pollution have caused great concern. Hydrogen is a renewable and environmentally friendly source of energy and has potential to be a major alternative energy carrier in the *** to its high capacity and relatively low cost of raw materials, alanate has been considered as one of the most promising candidates for hydrogen storage. Among them, LiAlH4and NaAlH4, as two representative metal alanates, have attracted extensive attention. Unfortunately, the high desorption temperature and sluggish kinetics restrict its practical application. In this paper, the basic physical and chemical properties as well as the hydrogenation/dehydrogenation reaction mechanism of LiAlH4and NaAlH4are briefly reviewed. The recent progress on strategic optimizations toward tuning the thermodynamics and kinetics of the alanate including nanoscaling,doping catalysts and compositing modification are emphatically discussed. Finally, the coming challenges and the development prospects are also proposed in this review.

关键词： Hydrogen storage LiAlH 4 NaAlH 4 Nanoscaling Catalysts Mechanism

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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 *** 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 *** 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,*** 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 *** synergistic effect enhances the hydrogen generation performance of AlInCl3-(Ni-Bi-B)*** 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

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Facile synthesis and electrochemical properties of layered Li[Ni1/3Mn1/3Co1/3]O2 as cathode materials for lithium-ion batteries

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Frontiers of materials Science 2017年第2期11卷 155-161页

作者： Yingfang ZHU Jingwei YOU Haifu HUANG Guangxu LI Wenzheng ZHOU Jin GUO guangxi key laboratory for Relativistic Astrophysics Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology College of Physics Science and Technology Guangxi University Nanning 530004 China guangxi collaborative innovation Center of structure and property for new energy and materials School of Materials Science and Engineering Guilin University of Electronic Technology Guilin 541004 China

A layered oxide Li[Ni1/3Mn1/3Co1/3]O2 was synthesized by an oxalate co- precipitation method. The morphology, structural and composition of the as-papered samples synthesized at different calcination temperatures were investigated. The results indicate that calcination temperature of the sample at 850℃ can improve the integrity of structural significantly. The effect of calcination temperature varying from 750℃ to 950℃ on the electrochemical performance of Li[Ni1/3Mn1/3Co1/3]O2, cathode material of lithiumion batteries, has been investigated. The results show that Li[Ni1/3Mn1/3Co1/3]O2 calcined at 850℃ possesses a higher capacity retention and better rate capability than other samples. The reversible capacity is up to 178.6 mA.h.g-1, and the discharge capacity still remains 176.3 mA-h.g-1 after 30 cycles. Moreover, our strategy provides a simple and highly versatile route in fabricating cathode materials for lithium-ion batteries.

关键词： Li[Ni1/3Mn1/3Co1/3]O2 cathode material oxalate co-precipitation lithiumion battery

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Design of near-α Ti alloys via a cluster formula approach and their high-temperature oxidation resistance

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Journal of materials Science & Technology 2019年第6期35卷 1008-1016页

作者： Beibei Jiang Donghui Wen Qing Wang Jinda Che Chuang Dong Peter K. Liaw Fen Xu Lixian Sun key laboratory of materials Modification by Laser Ion and Electron Beams (Ministry of Education) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Department of materials Science and Engineering The University of Tennessee Knoxville Tennessee 37996 USA guangxi key laboratory of information materials Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsSchool of Material Science and Engineering Guilin University of Electronic Technology Guilin 541004 China

The multi-component composition characteristics of high-temperature near-α Ti alloys were investigated in the present work by means of a cluster formula approach. The uniform cluster formula [CN12 cluster](glue atom)3 for the hexagonal close-packed α solid solution was first obtained based on the Friedel oscillation theory, with a total atom number in the formula of Z = 16. Then it was analyzed that the Z values in the cluster composition formulas of typical near-α Ti alloys are within the range of Z = 16.0016.30, being perfectly consistent with the ideal Z = 16. Based on it, a series of new alloys with Z = 16 and with Nb/Ta substitution for Mo in Ti1100 alloy were designed, suction-cast into φ 6 mm rods, and then heat-treated with solid solution and aging. It was found that the alloy with co-addition of Mo, Ta and Nb has a high strength and good ductility at both room and high temperatures. More importantly, the additions of Nb and Ta can contribute to the formation of continuous and compact Al2O3 scales, resulting in an obvious improvement of oxidation resistances at both 923 K and 1073 K. The effects of Mo, Ta and Nb on the oxidation behaviors of the designed alloys at 1073 K were further discussed.

关键词： Near-α Ti alloys Composition design Cluster formula approach Oxidation resistance Mechanical property

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Rambutan-like hierarchically porous carbon microsphere as electrodematerial for high-performance supercapacitors

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Carbon energy 2021年第2期3卷 361-374页

作者： Chunfeng Shao Shujun Qiu Guiming Wu Boyang Cui Hailiang Chu Yongjin Zou Cuili Xiang Fen Xu Lixian Sun guangxi key laboratory of information materials School of Materials Science and EngineeringGuangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsGuilin University of Electronic TechnologyGuilinChina key laboratory of Fuel Cell Technology of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhouChina

Used as high-performance electrodes,both structural and compositional alterations of carbon materials play very important roles in energy conversion/storage *** in supercapacitors,hierarchical pores and heteroatom doping in carbon materials are *** the rambutan-like hierarchically porous carbon microspheres(PCMs)have been constructed via a hydrothermal treatment,followed by carbonization/*** hierarchically porous microstructure is composed of three-dimensional porous carbon networks,which give rise to a large surface ***,N and O functional groups are introduced in the as-prepared samples,which could generate the extra *** from the interconnected hierarchical and open structure,PCM exhibits outstanding capacitive performance,for example,superior specific capacitance and rate capability(397 and 288 F g^(−1) at 0.5 and 20A g^(−1),respectively),as well as long cycling stability(about 95%capacitance retention after 10,000 cycles).These encouraging results may pave an efficient way to fabricate advanced supercapacitors in the future.

关键词： DTPA glucose hierarchically porous carbon rambutan-like microspheres supercapacitors

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Substantial thermoelectric enhancement achieved by manipulating the band structure and dislocations in Ag and La co-doped SnTe

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Journal of Advanced Ceramics 2021年第4期10卷 860-870页

作者： Wenjing XU Zhongwei ZHANG Chengyan LIU Jie GAO Zhenyuan YE Chunguang CHEN Ying PENG Xiaobo BAI Lei MIAO guangxi key laboratory of information Material Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsSchool of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China Department of materials Science and Engineering SIT Research LaboratoriesInnovative Global ProgramFaculty of EngineeringShibaura Institute of TechnologyTokyo 135-8548Japan

Eco-friendly SnTe based thermoelectric materials are intensively studied recently as candidates to replace PbTe;yet the thermoelectric performance of SnTe is suppressed by its intrinsically high carrier concentration and high thermal *** this work,we confirm that the Ag and La co-doping can be applied to simultaneously enhance the power factor and reduce the thermal conductivity,contributing to a final promotion of figure of *** one hand,the carrier concentration and band offset between valence bands are concurrently reduced,promoting the power factor to a highest value of-2436μW·m^(-1)·K^(-2) at 873 *** the other hand,lots of dislocations(~3.16×10^(7)mm^(-2))associated with impurity precipitates are generated,resulting in the decline of thermal conductivity to a minimum value of 1.87 W·m^(-1)·K^(-1) at 873 *** a result,a substantial thermoelectric performance enhancement up to zT≈1.0 at 873 K is obtained for the sample Sn0.94Ag0.09La0.05Te,which is twice that of the pristine SnTe(zT≈0.49 at 873 K).This strategy of synergistic manipulation of electronic band and microstructures via introducing rare earth elements could be applied to other systems to improve thermoelectric performance.

关键词： SnTe band convergence dislocation Ag and La co-doping thermoelectric performance

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

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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-encapsulated PEG produced thenovel composite PCMswithgood structure stability andcomprehensive energy storage *** 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 *** thermal conductivityofthe compositescould reach0.62 W m^(−1) K^(−1),which effectively enhanced the thermalresponse *** thecomposite PCMs exhibited good leakage-proof performance andexcellent light–thermal *** compressive strengthof thecomposite PCMscan improveupto 1.602 *** 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

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Carbon composite support improving catalytic effect of NbC nanoparticles on the low-temperature hydrogen storage performance of MgH_(2)

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Journal of materials Science & Technology 2023年第19期150卷 65-74页

作者： Yuxiao Jia Xuancheng Wang Leijie Hu Xuezhang Xiao Shuoqing Zhang Jiahuan He Jiacheng Qi Ling Lv Fen Xu Lixian Sun Lixin Chen State key laboratory of Silicon materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China key laboratory of Advanced materials and Applications for Batteries of Zhejiang Province Hangzhou 310013China guangxi collaborative innovation Center of structure and property for new energy and materials School of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China

Ultrafine carbon-based transition metal compounds have been widely investigated as efficient catalysts for enhancing the hydrogen storage performance of magnesium *** this work,the carbon ther-mal shock method is applied to synthesize the ultrafine carbon-encapsulated NbC nanoparticles with an average grain size of 17.3 *** MgH_(2)-10 wt%NbC/C composites show excellent low-temperature hy-drogen storage performance with the onset dehydrogenation temperature of 196.1℃,which is 92.2℃ and 98℃ lower than that of MgH_(2)-10 wt%NbC and undoped MgH_(2),***,MgH_(2)-10 wt%NbC/C can absorb 6.71 wt%H_(2) at 100℃ within 30 min around and retain almost 100%reversible hydrogen desorption capacity after 10 *** the catalytic mechanism,the electron transfer process between multi-valence Nb cations of in-situ formed NbH x and Mg,H atoms can greatly improve the cyclic de/rehydrogenation kinetics of MgH_(2)-NbC/***,the enhancement of dehydrogenation kinetics can also be ascribed to MgH_(2) particle refinement by NbC nanoparticles,and destabilization of the Mg-H bond caused by carbon *** investigation not only proves that carbon-encapsulated NbC nanoparti-cles can greatly enhance the hydrogen storage performance of MgH_(2) but provides an idea of preparing carbon-based transition metal carbides as effective catalysts for magnesium-based hydrogen storage ma-terials.

关键词： MgH_(2) Carbon-encapsulated Nanoparticles Catalyst Kinetics

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Robust architecture of 2D nano Mg-based borohydride on graphene with superior reversible hydrogen storage performance

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Journal of materials Science & Technology 2023年第15期146卷 121-130页

作者： Xuancheng Wang Yuxiao Jia Xuezhang Xiao Panpan Zhou Jiapeng Bi Jiacheng Qi Ling Lv Fen Xu Lixian Sun Lixin Chen State key laboratory of Silicon materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China guangxi collaborative innovation Center of structure and property for new energy and materials School of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China key laboratory of Advanced materials and Applications for Batteries of Zhejiang Province Hangzhou 310013China

Efficient technical strategies to synthesize hydrides with high capacity and favorable reversibility are significant for the development of novel energy ***,nano Mg-based borohydride,Mg(BH_(4))_(2),with robust architecture was designed and prepared by confining on graphene through a solution selfconfinement *** Mg(BH_(4))_(2) confined on graphene displays a wrinkled 2D nano layer morphology within 8.8 nm *** 2D nano Mg(BH_(4))_(2) can start dehydrogenation at 67.9℃ with a high capacity of 12.0 wt.%,which is 190.5℃ lower than pristine Mg(BH_(4))_(2).The isothermal dehydrogenation tests and kinetics fitting results indicate the 2D nano Mg(BH_(4))_(2) possesses much-enhanced dehydrogenation kinetics of 31.3 kJ/mol activation energy,which is only half of pristine Mg(BH_(4))_(2).The thermodynamics of the 2D nano Mg(BH_(4))_(2) is also verified by PCT tests,of which Gibbs free energy value for the confined 2D nano Mg(BH_(4))_(2) is estimated to be-18.01 kJ/mol H_(2),lower than-16.36 kJ/mol H_(2) of pristine Mg(BH_(4))_(2).Importantly,the reversibility of the confined 2D nano Mg(BH_(4))_(2) is significantly enhanced to over 90%capacity retention with relatively kinetics stability during 10 *** mechanism analyses manifest that Mg(BH_(4))_(2) exhibits stable 2D nano morphology during 10 cyclic tests,resulting in the greatly reduced H diffusion path and the improved de/rehydrogenation kinetics of the 2D nano Mg(BH_(4))_(2).Based on theoretical calculations of Mg(BH_(4))_(2) and the intermediate MgB12H12 confined on graphene,the charge transfer status of both samples is modified to facilitate de/rehydrogenation,thus leading to the significant thermodynamic improvements of the reversible hydrogen storage performances for 2D nano Mg(BH_(4))_(2).Such investigation of the Mg-based borohydride will illuminate prospective technical research of energy storage materials.

关键词： Mg(BH_(4))_(2) Nano-confinement Kinetics Thermodynamics Reversible hydrogen storage

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