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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

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

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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

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

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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

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

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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

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

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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

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

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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

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

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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

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

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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

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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

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