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Self-templating construction of Hollow microspheres assembled by nanosheets with exposed active planes for sodium ion storage

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Nano Research 2023年第4期16卷 4987-4995页

作者： Jianing Liang Zhizhan Li Jinguo Cheng Jinlei Qin Hongfang Liu Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

P2-type layered metal oxides have been considered as one of the promising cathode candidates for high-performance Na-ion batteries(SIBs).However,it is still challenging to balance the contradiction of high energy density and long cycle life due to the structural degradation and sluggish ion diffusion dynamics.Here,the hierarchical P2-Na2/3Ni1/3Mn2/3O2 Hollow microspheres assembled by nanosheets are constructed via a self-template approach.The obtained nanosheets with more exposed electrochemical active planes serving as desodiation/sodiation reactors can provide substantial Na+channels,shorten the diffusion pathways,and accommodate the volume changes during charge/discharge process.Benefiting from the facile Na+diffusion paths and optimal architecture modulation,the cathode delivers a high initial Coulombic efficiency of 96.0%with a high energy density of 299.7 Wh·kg^(−1).The highly reversible structural evolutions processes are verified by galvanostatic intermittent titration technique(GITT)and operando electrochemical impedance spectroscopy(EIS)measurement,which would significantly improve the cycle stability(83.3%capacity retention at 1.0 C over 500 loops).Furthermore,the full cell assembled by hard carbon presents a high reversible capacity of 71 mAh·g^(−1)at 0.2 C and promising capacity retention(91.5%after 50 cycles).The designing concept of morphological configuration in this work paves an accessible route for building high-performance electrode materials.

关键词： sodium-ion batteries P2-type cathode Hollow microspheres self-template nanosheets structure

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VN nanoparticle-assembled Hollow microspheres/N-doped carbon nanofibers:An anode material for superior potassium storage

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Nano Materials Science 2022年第2期4卷 104-112页

作者： Ya Ru Pei Ming Zhao Yu Peng Zhu Chun Cheng Yang Qing Jiang Key Laboratory of Automobile Materials(Jilin University) Ministry of Educationand School of Materials Science and EngineeringJilin UniversityChangchun130022China

Thanks to inexpensive and bountiful potassium resources,potassium ion batteries(PIBs)have come into the spotlight as viable alternatives for next-generation battery systems.However,poor electrochemical kinetics due to the large size of the K^(+) is a major challenge for PIB anodes.In this paper,an ingenious design of VN nanoparticleassembled Hollow microspheres within N-containing intertwined carbon nanofibers(VN-NPs/N-CNFs)via an electrospinning process is reported.Employed as PIB anodes,VN-NPs/N-CNFs exhibit a superb rate property and prolonged cyclability,surpassing that of other reported metal nitride-based anodes.This is ascribed to:(i)the VN NP-assembled Hollow microspheres,which shorten the K^(+) diffusion distance,and mitigate volume expansion;and(ii)the interconnected N-CNFs,which supply numerous active sites for K^(+) adsorption and facilitate rapid electron/ion transport.

关键词： Potassium-ion batteries VN nanoparticles N-doped carbon nanofibers Hollow microspheres

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Depositing Ag3PO4 on WO3 Hollow microspheres at room temperature for rapid photocatalytic degradation of Rhodamine B

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Progress in Natural Science:Materials International 2022年第3期32卷 282-288页

作者： Yaru Shang Yongping Cui Ruixia Shi Quande Che Aiyu Zhang Ping Yang School of Materials Science and Engineering University of Jinan

A series of WO3Hollow microspheres decorated with Ag3PO4nanoparticles(APW) composites with Ag3PO4:WO3mass percentage of 20%(20APW), 30%(30APW), 40%(40APW) and 50%(APW) were successfully synthesized,characterized and tested for the degradation of the Rhodamine B(Rh B) under 300 W xenon lamp radiation. The photocatalytic results showed that the photocatalytic degradation performances of WO3Hollow microspheres decorated with Ag3PO4nanoparticles on Rh B were significantly enhanced, which were much higher than that of individual Ag3PO4and WO3. Especially for 40APW, Rh B can be completely degraded within 10 min. The order of degradation efficiency is 20APW<50APW< 30APW<40APW. The rate constant of 40APW(0.3902 min-1) is about 81.3 times that of WO3(0.0048 min-1). The diffuse reflection, photoluminescence and electrochemical impedance tests showed that the formation of Ag3PO4/WO3composite structure broadened the light absorption range, reduced the recombination rate of photogenerated electrons and holes, and decreased the resistance to charge transfer, which are beneficial to the improvement of photocatalytic performance. The capture agent experiments were carried out with 40APW, which specified the primary role of h+and ·O2-in the degradation of Rh B. The formation of heterojunction between Ag3PO4and WO3that effectively separates photogenerated electrons and holes are contributed to the enhancement of photocatalytic properties of APW composites.

关键词： WO 3 Hollow microspheres Ag 3 PO 4 Heterojunction Photocatalytic Mechanism

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MnS Hollow microspheres combined with carbon nanotubes for enhanced performance sodium-ion battery anode

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Chinese Chemical Letters 2020年第5期31卷 1221-1225页

作者： Na Zhang Xin Li Tianyi Hou Jinze Guo Anran Fan Shibo Jin Xiaohong Sun Shu Cai Chunming Zheng School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjin 300072China State Key Laboratory of hollow-fiber Membrane Materials and Membrane Processes School of Environmental and Chemical EngineeringTianjin Polytechnic UniversityTianjin 300387China

MnS as anode material for sodium-ion batteries(SIBs)has recently attracted great attention because of the high theoretical capacity,great natural abundance,and low cost.However,it suffers from inferior electrical conductivity and large volume expansion during the charge/discharge process,leading to tremendous damage of electrodes and subsequently fast capacity fading.To mitigate these issues,herein,a three-dimensional(3D)interlaced carbon nanotubes(CNTs)threaded into or between MnS Hollow microspheres(hollow MnS/CNTs composite)has been designed and synthesized as an enhanced anode material.It can effectively improve the electrical conductivity,buffer the volume change,and maintain the integrity of the electrode during the charging and discharging process based on the synergistic interaction and the integrative structure.Therefore,when evaluated as anode for SIBs,the hollow MnS/CNTs electrode displays enhanced reve rsible capacity(275 mAh/g at 100 mA/g after 100 cycles),which is much better than that of pure MnS electrode(25 mAh/g at 100 mA/g after 100 cycles)prepared without the addition of CNTs.Even increasing the current density to 500 mA/g,the hollow MnS/CNTs electrode still delivers a five times higher reversible capacity than that of the pure MnS electrode.The rate performance of the hollow MnS/CNTs electrode is also superior to that of pure MnS electrode at various current densities from 50 mA/g to 1000 mA/g.

关键词： MnS CNTs Hollow microspheres Anode Sodium-ion battery

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Preparation and photoluminescence enhancement of Li^+ and Eu^(3+) co-doped YPO_4 Hollow microspheres

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Journal of Rare Earths 2013年第5期31卷 449-455页

作者：张立新酒红芳付跃华孙益新王瑗钟 Chemical Engineering and Environment Institute North University of China College of Science North University of China

Li＋ and Eu3＋ co-doped YPO4 Hollow microspheres were successfully synthesized by a sacrificial template method using polystyrene （PS） as template. Techniques of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, as well as transmission electron microscopy （TEM） were employed to characterize the as-synthesized sample. Furthermore, the photoluminescence （PL） characterization of the Li＋ and Eu3＋ co-doped YPO4 microsphere was carried out and the effects of the doping concentration of Li＋ and Eu3＋ active center concentration as well as calcination temperature on the PL properties were studied in detail. The results showed that the incorporation of Li＋ ions into the YPOa：Eu3＋ lattice could induce a remarkable improvement of the PL intensity. The highest emission intensity was observed with the compound of 5%Li＋ and 5%Eu3＋ co-doped YPO4, whose brightness was increased by a factor of more than 2.2 in comparison with that of the YPO4：5%Eu3＋.

关键词： yttrium orthophospha sacrificial template europium lithium photoluminescence Hollow microspheres rare earths

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Preparation of P(MBA-co-MAA)/Zr(OH)_(4)/P(EGDMA-co-MAA)/TiO_(2)Tetra-layer Hybrid microspheres and the Corresponding ZrO_(2)/TiO_(2)Double-shelled Hollow microspheres

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Chinese Journal of Chemistry 2014年第2期32卷 163-171页

作者： Dianbin Qin Jinhui Yu Guomin Bian Yonglin Qi Dongwei Zhang Xinlin Yang Key Laboratory of Functional Polymer Materials Ministry of EducationInstitute of Polymer ChemistryCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Nankai UniversityTianjin 300071China Dynea Ltd.Co. Gaoyao CityGuangdong 526105China

Double-shelled zirconia/titania(ZrO_(2)/TiO_(2))Hollow microspheres were prepared by the selective removal of the polymer components via the calcination of the corresponding tetra-layer poly(N,N'-methylenebisacryl amide-comethacrylic acid)(P(MBA-co-MAA))/Zr(OH)_(4)/poly(ethyleneglycol dimethacrylate-co-methacrylic acid)(P(EGDMAco-MAA))/TiO_(2)hybrid microspheres.These tetra-layer microspheres were synthesized by the combination of the distillation copolymerization of N,N′-methylenebisacryl amide-co-methacrylic acid(MBA)or ethyleneglycol dimethacrylate(EGDMA)crosslinker and methacrylic acid(MAA)for the preparation of polymer core and thirdlayer as well as the controlled sol-gel hydrolysis of inorganic precursors for the construction of zirconium hydroxide(Zr(OH)_(4))and titania(TiO_(2))layers.The thicknesses of zirconia and titania shell-layers were conveniently controlled via varying the feed of zirconium n-butoxide(Zr(OBu)_(4))and titanium tetrabutoxide(TBOT)during the sol-gel hydrolysis,while the sizes of polymer layers were tuned through a multi-stage distillation precipitation copolymerization.The structure and morphology of the resultant microspheres were characterized by transmission electron microscopy(TEM),X-ray diffractometer(XRD),X-ray photoelectronic spectroscopy(XPS),and thermogrametric analysis(TGA).

关键词： double-shelled microspheres Hollow microspheres ZrO_(2)/TiO_(2)microspheres

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Effect of system parameters on the size distributions of hollow nickel microspheres produced by an ultrasound-aided electrical discharge machining process

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Particuology 2014年第6期12卷 36-41页

作者： Yifan Liu Xianglong Li Fushi Bai Jian Chen Yantao Wang Nan Liu School of Manufacturing Science and Engineering Sichuan University School of Mechanical and Manufacturing Engineering University of New South Wales

Ultrasound-aided electric discharge machining（EDM） is an emerging technology for producing hollow nickel microspheres.This technology combines traditional EDM with the cavitation and vibration effects of ultrasound to produce Hollow microspheres.In this paper,ultrasound-aided EDM was carried out in a kerosene medium（the working solution）.The effects of various parameters on the sizes of microspheres were investigated using scanning electronic microscopy（SEM）.Smileview software was used to measure the sizes of the microspheres.Originpro software was used for statistical analysis to determine the size distributions of the microspheres.To study the effects of the system parameters on the sizes of the microspheres,we first investigated the necessity of using an ultrasonic wave with EDM.After comparing the experimental results with and without the ultrasonic field,we found that ultrasound-induced cavitation and vibration effects reduced the diameters of the microspheres.We then studied the effects of several electrical parameters,including the arc current,pulse width,and gap voltage,on the sizes of the microspheres at an ultrasound frequency of 40 kHz.Smaller microspheres could be obtained by lowering the arc current,pulse width,and gap voltage.

关键词： Hollow microspheres Ultrasonic-aided EDM Cavitation Electrical parameters Size distribution

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Synthesis of Porous hollow Micro spheres of BiVO_4 Based on EDTA and SDBS via Hydro thermal Method

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Journal of Donghua University(English Edition) 2016年第3期33卷 399-402页

作者：林杰李贤英薛罡刘焕联陈秋玲 College of Environmental Science and Engineering Donghua University Shanghai 201620 China China Academy of Building Research Shanghai Institute Shanghai 200030 China

Porous Hollow microspheres of bismuth vanadate(BiVO_4) were successfully synthesized with the assistances of ethylenediamine tetraacetic(EDTA) and sodium dodecylbenzene sulfonate(SDBS) via hydrothermal method.The as-prepared BiVO_4 samples were characterized by X-ray diffraction(XRD),field-emission scanning electron microscopy(FE-SEM) and UV-vis diffuse reflectance spectra(DRS).It was found that the ratio of EDTA and SDBS had a significant impact on the crystalline structure,size and morphology of BiVO_4 photocatalyst.The crystal phase could be adjusted by changing the mass ratio of EDTA and SDBS.The photocatalytic activities of different BiVO_4 samples were investigated through the degradation of RhB in the presence of H_2O_2 under visible light irradiation.The results indicated that the photocatalytic performance of the BiVO_4 microstructures was greatly influenced by the porous structure,morphology and band gap.The BiVO_4 sample prepared with the EDTA and SDBS ratio of 2:1 and total amount of 1.5 g have shown superior photocatalytic performance for its unique morphology,good porous structure and low band gap energy.

关键词： bismuth vanadate（BiVO4） Hollow microspheres hydrothermal synthesis visible-light-driven photocatalyst

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Template-Free Synthesis of Sb_2S_3 Hollow microspheres as Anode Materials for Lithium-Ion and Sodium-Ion Batteries

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Nano-Micro Letters 2018年第1期10卷 105-116页

作者： Jianjun Xie Li Liu Jing Xia Yue Zhang Min Li Yan Ouyang Su Nie Xianyou Wang National Base for International Science and Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion School of Chemistry Xiangtan University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University

Hierarchical Sb_2S_3 Hollow microspheres assembled by nanowires have been successfully synthesized by a simple and practical hydrothermal reaction. The possible formation process of this architecture was investigated by X-ray diffraction, focused-ion beam-scanning electron microscopy dual-beam system, and transmission electron microscopy. When used as the anode material for lithium-ion batteries, Sb_2S_3 Hollow microspheres manifest excellent rate property and enhanced lithium-storage capability and can deliver a discharge capacity of 674 m Ah g^(-1) at a current density of 200 m A g^(-1) after 50 cycles. Even at a high currentdensity of 5000 m A g^(-1), a discharge capacity of541 m Ah g^(-1) is achieved. Sb_2S_3 Hollow microspheres also display a prominent sodium-storage capacity and maintain a reversible discharge capacity of 384 m Ah g^(-1) at a current density of 200 m A g^(-1) after 50 cycles. The remarkable lithium/sodium-storage property may be attributed to the synergetic effect of its nanometer size and three-dimensional hierarchical architecture, and the outstanding stability property is attributed to the sufficient interior void space,which can buffer the volume expansion.

关键词： Sb2S3 Hollow microspheres Anode material Lithium-ion batteries Sodium-storage property

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Synthesis and NH_(3)/TMA sensing properties of CuFe_(2)O_(4) Hollow microspheres at low working temperature

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Rare Metals 2021年第7期40卷 1768-1777页

作者： Kai-Di Wu Jin-Yong Xu Marc Debliquy Chao Zhang College of Mechanical Engineering Yangzhou UniversityYangzhou 225127China Materials Science Department University of MonsMons 7000Belgium

In this work,CuFe_(2)O_(4) Hollow microspheres assembled with nanosheets(CuFe_(2)O_(4) HMANs)were synthesized using a solvothermal method followed by an annealing treatment.The effects of annealing temperature on microstructure,chemical composition and gas sensing characteristics of as-prepared samples were investigated.The results showed that annealing treatment played a crucial role in the final products.All samples demonstrated hollow spherical morphology assembled with nanosheets or nanoparticles.The CuFe_(2)O_(4) HMANs annealed at400℃exhibited the best n-type conductometric sensing properties toward low-concentration NH3 at 100℃and49%RH.The sensor response to 10×10^(-6)NH_(3) was 4.0 with a rapid response time of 32 s,and it even showed a response of 1.2 toward 1×10^(-6)NH3 at the same condition,while a response of 3.95 to trimethylamine(TMA).The CuFe_(2)O_(4) HMANs-based NH_(3) sensor also exhibited good selectivity and excellent reproducibility.Therefore,this work provided a novel promised sensing material of low-concentration NH_(3) and TMA for real-time monitoring.

关键词： Copper ferrite Hollow microspheres Gas sensor Ammonia Trimethylamine

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