检索结果-南通市图书馆

Nano Research 2024年第3期17卷 1182-1189页

作者： Tianqi Yu Kexin Tan Jia Wu yongjin zou Shibin Yin Guangxi Key Laboratory of Electrochemical Energy Materials School of Chemistry and Chemical EngineeringGuangxi UniversityNanning 530004China Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China

It is still a lack of bifunctional catalysts for ammonia oxidation reaction(AOR)and hydrogen evolution reaction(HER)due to their different reaction *** this work,P is doped into PtZn alloy by calcination with NaH_(2)PO_(2) as P source to induce the lattice tensile strain of Pt and the electronic interaction between P and Zn,which optimizes the AOR and HER activity *** sample with the optimal P content can drive the AOR peak current density of 293.6 mA·mgPt^(-1),which is almost 2.7 times of *** HER,the overpotential at^(-1)0 mA·cm^(-2) is only 23 mV with Tafel slope of 34.1 mV·dec^(-1).Furthermore,only 0.59 V is needed to obtain 50 mA·mgPt^(-1) for ammonia electrolysis under a two-electrode ***,this work shows an ingenious method to design bifunctional catalysts for ammonia electrolysis.

关键词： PtZn alloy phosphorous doping ammonia oxidation reaction hydrogen evolution reaction bifunctional catalyst

Nb_(30)Ti_(35)Co_(35)合金定向凝固组织演化和显微硬度研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

稀有金属 2024年第2期48卷 164-173页

作者：王豪闫二虎王金华褚海亮邹勇进孙立贤桂林电子科技大学材料科学与工程学院广西信息材料重点实验室广西桂林541004 中南大学粉末冶金国家重点实验室湖南长沙410083

三元以及多元合金凝固过程中,多组元间相互耦合和溶质再分配造成其凝固路径及其组织异常复杂,到目前为止尚未建立起完整统一的三元共晶凝固理论模型,凝固组织和机械性能的本质关系亟待研究。基于此,针对Nb_(30)Ti_(35)Co_(35)共晶合金(... 详细信息

三元以及多元合金凝固过程中,多组元间相互耦合和溶质再分配造成其凝固路径及其组织异常复杂,到目前为止尚未建立起完整统一的三元共晶凝固理论模型,凝固组织和机械性能的本质关系亟待研究。基于此,针对Nb_(30)Ti_(35)Co_(35)共晶合金(实测Nb_(31)Ti_(34)Co_(35))开展了不同抽拉速率(v=3,5,15,30,70μm·s^(-1))下的定向凝固实验研究,测量其显微硬度(H),旨在探索不同抽拉速率下合金的微观组织演化规律,并构建组织和性能之间的关系。结果表明:除极少量初生α-Nb外,常规铸态合金几乎完全由共晶(α-Nb+TiCo)组织构成,相类似地,定向凝固合金组织中也含有相同的组织类型(少量的Ti_(2)Co除外),即初生α-Nb和共晶(α-Nb+TiCo)组织;随着抽拉速率的逐渐增加,初生相α-Nb依次经历了“圆球状→团簇状→枝晶状”的转变,稳态生长区内共晶组织逐渐粗化,共晶排列不规则且相间距明显变大,淬火界面失稳并依次经历胞状界面到枝晶状界面转变;另外,与常规铸态合金相比较,定向凝固后合金的显微硬度明显提升并随着抽拉速率的减小而显著增加,二者关系为H=222.4+v^(-0.4328)+319.8,其中,抽拉速率为3μm·s^(-1)时的合金显微硬度值最大,为HV_(0.3)462,约为铸态合金的1.5倍。证实了定向凝固工艺可以调控合金显微组织,进而有效提高Nb-Ti-Co合金机械性能。

关键词： Nb-Ti-Co合金定向凝固微观组织显微硬度

Effects of highly dispersed Ni nanoparticles on the hydrogen storage performance of MgH_(2)

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 54-62页

作者： Nuo Xu Zirui Yuan Zhihong Ma Xinli Guo Yunfeng Zhu yongjin zou Yao Zhang School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Metallic MaterialsSoutheast UniversityNanjing 211189China School of Materials Science and Engineering Baise UniversityBaise 533000China College of Materials Science and Engineering Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function CompositesNanjing Tech UniversityNanjing 211816China Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China

MgH_(2)with a large hydrogen capacity is regarded as a promising hydrogen storage ***,it still suffers from high thermal stability and sluggish *** this paper,highly dispersed nano-Ni has been successfully prepared by using the polyol reduction method with an average size of 2.14 nm,which significantly improves the de/rehydrogenation properties of MgH_(2).The MgH_(2)–10wt%nano-Ni sample starts releasing H_(2)at 497 K,and roughly 6.2wt%H_(2)has been liberated at 583 *** rehydrogenation kinetics of the sample are also greatly improved,and the adsorption capacity reaches 5.3wt%H_(2)in 1000 s at 482 K and under 3 MPa hydrogen ***,the activation energies of de/rehydrogenation of the MgH_(2)–10wt%nano-Ni sample are reduced to(88±2)and(87±1)kJ·mol−1,*** addition,the thermal stability of the MgH_(2)–10wt%nano-Ni system is reduced by 5.5 kJ per mol H_(2)from that of pristine MgH_(2).This finding indicates that nano-Ni significantly improves both the thermodynamic and kinetic performances of the de/rehydrogenation of MgH_(2),serving as a bi-functional additive of both reagent and catalyst.

关键词： Ni nanoparticle kinetics thermodynamics MgH2 hydrogen storage performance

Preparation and optical properties of three-dimensional navel-like Bi_2WO_6 hierarchical microspheres

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2019年第3期30卷 783-786页

作者： Qiang Chen Yuqin Mao Naici Bing yongjin zou Luping Zhu School of Environmental and Materials Engineering Research Center of Resource Recycling Science and Engineering Shanghai Polytechnic University (SSPU) Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology (GUET) Shanghai Innovation Institute for Materials

Three-dimensional(3D) navel-like Bi_2WO_6(BWO) hierarchical microspheres(HMSs) were successfully prepared using a simple hydrothermal method. The as-obtained BWO samples were characterized by a variety of techniques. XRD result indicated that the as-synthesized samples were well-crystallized orthorhombic phase Bi_2WO_6 structure. SEM observations revealed that the hierarchical microspheres with an average diameter of 2 μm were built from several dozen of nanosheets. UV-vis diffuse reflectance spectrum study revealed that the obtained BWO sample had band gap energy of about 3.3 ***(PL) result showed that the sample had weak emission intensity. The BET specific surface area of the BWO sample was about 35.40 m^2/g. The photocatalytic efficiency of the as-obtained BWO was evaluated by the degradation of norfloxacin(NOR) antibiotic. The result showed an about 67%NOR degradation in 8 h.

关键词： Semiconductors Bi2WO6 Crystal growth Microstructure Optical properties

Stabilized multifunctional phase change materials based on carbonized Cu-coated melamine foam/reduced graphene oxide framework for multiple energy conversion and storage

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2022年第6期4卷 1214-1227页

作者： Zhicong Hu yongjin zou Cuili Xiang Lixian Sun Fen Xu Menghe Jiang Sensen Yu Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilinGuangxiPR China Guangxi Collaborative Innovation Center of Structure and Property for New Energy Materials GuilinGuangxiPR China

The leakage of organic phase change materials(OPCMs)at temperatures above their melting point severely limits their large-scale *** introduction of porous supports has been identified as an efficient leakageproofing *** this study,a novel carbonized Cu-coated melamine foam(MF)/reduced graphene oxide(rGO)framework(MF/rGO/Cu-C)is constructed as a support for fabricating stabilized multifunctional *** serves as the supporting material,while rGO and Cu act as functional *** a thermal energy storage material,polyethylene glycol(PEG)is encapsulated into MF/rGO/Cu-C through a vacuum-assisted impregnation method to obtain PEG@MF/rGO/Cu-C composite with excellent comprehensive ***@MF/rGO/Cu-C exhibits high phase change enthalpies of 148.3 J g^(-1)(melting)and 143.9 J g^(-1)(crystallization),corresponding to a high energy storage capability of 92.7%.Simultaneously,MF/rGO/Cu-C endues the composite with an enhanced thermal conductivity of 0.4621Wm^(-1) K^(-1),which increases by 463%compared to that of PEG@***,PEG@MF/rGO/Cu-C displays great light-to-thermal and electric-to-thermal conversion capabilities,thermal cycle stability,light-tothermal cycle stability,and shape stability,showing promising application prospects in different aspects.

关键词： Cu-coated network melamine foam PEG reduced graphene oxide stabilized multifunctional phase change materials

Spacing graphene and Ni-Co layered double hydroxides with polypyrrole for high-performance supercapacitors

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第20期52卷 190-197页

作者： Jing Liang Cuili Xiang yongjin zou Xuebu Hu Hailiang Chu Shujun Qiu Fen Xu Lixian Sun Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China Chongqing University of Technology College of Chemistry&Chemical EngineeringChongqing 400054China

The urgent need of high-performance of energy storage devices triggers us to design newly class of ***,the materials feature with high conductivity,abundant pore s and excellent ***,a sandwiched hybrid composite containing reduced graphene oxide,polypyrrole and Ni-Co layered double hydroxides(RGO/PPy/NiCo-LDH) was prepared in a facile *** polypyrrole was incorporated in the two dimensional(2D) nanosheets,which not only serve as the spacer to increase the surface area,but also enhance the conductivity of the *** obtained architecture was employed as an advanced electrode in a *** electrode shows an ultrahigh specific capacitance(2534 F g^-1 at 1 A g^-1) and good cycling efficiency(78 % after 5000 cycles).Moreover,an asymmetric cell based RGO/PPy/NiCo-LDH composite demonstrates excellent electrochemical properties and good prospect of practical use.

关键词： Graphene Ni-Co layered double hydroxides Polypyrrole Supercapacitor Porous carbon

Encapsulation of hollow Cu_(2)O nanocubes with Co_(3)O_(4)on porous carbon for energy-storage devices

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第20期52卷 182-189页

作者： yongjin zou Xi Zhang Jing Liang Cuili Xiang Hailiang Chu Huanzhi Zhang Fen Xu Lixian Sun Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China

Co3 O4 is one of the most studied transition-metal oxides for use in energy-storage ***,its poor conductivity and stability limit its *** this study,a facile method for anchoring Co3 O4-encapsulated Cu2 O nanocubes on porous carbon(PC) to form Cu2 O@Co3 O4/PC was *** Cu2 O@Co3 O4/PC composite exhibited superior electrochemical performance as a supercapacitor electrode *** resultant supercapacitor delivered high specific capacitance(1096 F g^-1 at 1 A g^-1),high rate capability(83 % retention at 10 A g^-1),and excellent cycling stability(95 % retention of initial capacitance after 3000 cycles).Moreover,an asymmetric supercapacitor fabricated by coupling a Cu2 O@Co3 O4/PC positive electrode with a reduced graphene oxide negative electrode exhibited high energy density(32.1 W h kg^-1 at 700 W kg^-1).Thus,our results demonstrate that Cu2 O@Co3 O4/PC is a promising electrode material for energy-storage devices.

关键词： Cu_(2)O Co_(3)O_(4) Hollow nanocube Graphene Composite

Modulating metal-support interaction between Pt_(3)Ni and unsaturated WOx to selectively regulate the ORR performance

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2023年第10期42卷 46-53页

作者： Jinli Chen Shouquan Feng Tianqi Yu yongjin zou Huan Wen Shibin Yin Guangxi Key Laboratory of Electrochemical Energy Materials School of Chemistry and Chemical EngineeringGuangxi UniversityNanning530004China Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin541004China

Tuning strong metal-support interaction between Pt-based alloys and metal oxides is an effective strategy for modulating the performance of oxygen reduction reaction(ORR).Herein,Pt_(3)Ni alloy anchored on WO_(x) with different content of oxygen vacancies is synthesized,and the effect of unsaturated WO_(x) on ORR activity/stability is *** results indicate that ORR activity is positively correlated with oxygen vacancy concentration,while durability presents the opposite *** functional theory(DFT)calculation results suggest that controlling the content of oxygen vacancies can usefully adjust the charge redistribution between Pt_(3)Ni and WO_(x),which can optimize the adsorption/activation of reactants,thus obtaining good ORR *** study uncovers the effect of unsaturated WO_(x) on ORR performance for Pt-based alloys and provides a promising strategy to design efficient and stable ORR catalysts.

关键词： Oxygen vacancies Catalyst Oxygen reduction reaction Strong metal support interaction Density functional theory calculation

Binary Co–Ni oxide nanoparticle-loaded hierarchical graphitic porous carbon for high-performance supercapacitors

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第2期37卷 135-142页

作者： Yin Liu Cuili Xiang Hailiang Chu Shujun Qiu Jennifer McLeod Zhe She Fen Xu Lixian Sun yongjin zou Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin541004China Department of Chemistry Queen’s UniversityK7L 3N6Canada

Heteroatom doped graphitic porous carbon is highly desirable for electrochemical applications because of its excellent conductivity and high surface *** this study,highly uniform Co-Ni oxide nanoparticleloaded B,N-doped hierarchical graphitic porous carbon was prepared through a dual pyrolysis *** dispersed chitosan hydrogel was first used as a precursor to fabricate the porous carbon(GCS–C)at 700℃.Co and Ni oxide nanoparticles were further anchored on the porous carbon through chemical reduction and calcined at high *** structure of the porous carbon was optimized by the introduction of graphene to the chitosan *** graphitic degree of the porous carbon was significantly improved by the Co and Ni *** heteroatom B and N were found to be well doped in the *** features enable the composite to be an excellent candidate for supercapacitor *** composite demonstrates a high capacitance(1266.7 F g-1 at 1 A g-1)and excellent stability.

关键词： Graphitic carbon Graphene Metal oxides Supercapacitor Porous carbon

Low-temperature synthesis of sea urchin-like Co-Ni oxide on graphene oxide for supercapacitor electrodes

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第20期52卷 223-230页

作者： Xueying Yang Cuili Xiang yongjin zou Jing Liang Huanzhi Zhang Erhu Yan Fen Xu Xuebu Hu Qiong Cheng Lixian Sun Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China Chongqing University of Technology College of Chemistry&Chemical EngineeringChongqing 400054China The Fifth Electronic Research Institute of the Ministry of Industry and Information Technology Guangzhou 510610China

Transition metal oxides are ideal electrode materials used for ***,the synthesis of transition metal oxides suffers from drawbacks such as high reaction temperature and energy ***,we report the synthesis of sea urchin-like Co3 O4-NiO composites supported on graphene oxide(GO) using a hydrothermal method followed by calcination with a low temperature(250℃).The obtained Co3O4-NiO/GO composite demonstrates a high specific capacitance of 883 F g^-1 at 1 A g^-***,upon coupling with an activated carbon(AC) positive electrode,an asymmetric cell of Co3 O4-NiO/GO//AC exhibits outstanding stability reflected by the high capacitance retention of 82% at a high current density of 10 A g^-*** excellent electrochemical properties of the composite may be attributed to the good synergistic effect of Co3O4 and NiO,as well as the assembly of Co3 O4 and NiO into a sea urchin structure,which results in increased electron conductivity and more exposed electroactive sites leading to the promotion of the Faradaic redox process.

关键词： Supercapacitor Co_(3)O_(4)-NiO Graphene oxide Composite Electrochemical properties