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Nano Research 2022年第5期15卷 4638-4645页

作者： Hao Gao Liming Sun Mengge Li Wenwen Zhan Xiaojun Wang Xiguang Han Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials School of Chemistry and Chemical EngineeringJiangsu Normal UniversityXuzhou 221116China

The application of semiconductors-based photocatalysts in organic transformation has been limited by the low light utilization efficiency and the rapid recombination of photo-induced charge carriers.In this paper,we have successfully fabricated a hollow cuboctahedral nanostructure(CNNCH),which is composed of N-doped carbon layer and CuO/NiO p-n heterojunctions.The hollow structure in CNNCH can effectively favor the light utilization through the multiple light reflection and scattering.The separation of photo-induced charge carriers can be highly improved by the exitence of charge transfer pathways between the p-n heterojunctions and semiconductor/N-doped carbon layer interfaces.Due to the above advantages,hollow cuboctahedral CNNCH as the photocatalyst has behaved high performance towards the photocatalytic cross-dehydrogenative coupling reaction.

关键词： organic transformation p-n heterojunction N-doped carbon semiconductor hollow structure

Rational construction of CoP@C hollow structure for ultrafast and stable sodium energy storage

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Rare Metals 2022年第6期41卷 1859-1869页

作者： Ling-BoRen Wei Hua Zhi-Dong Hou Jian-Gan Wang State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science andEngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi'an 710072China

The development of transition metal phosphides as potential anode materials of sodium-ion batteries has been substantially hindered by their sluggish kinetics and significant volume change during the sodiation/desodiation process.In this work,we put forward a rational design strategy to construct a hollow-structured CoP@C com-posite to achieve ultrafast and durable sodium energy storage.The CoP@C composite with a well-defined hollow dodecahedron architecture has been synthesized via a stepwise treatment of carbonization and pohsphorization on ZIF-67.The unique hollow carbon framework not only provides high-speed electron/ion transportation pathways for CoP to enable fast sodiation kinetics,but also accom-modates large volume change to stabilize the electrode structure.As a consequence,the CoP@C composite could exhibit an ultra-high rate capability of 105 mAh·g^(-1)at a current density of 30 A·g^(-1),and a long-term cycling life-time.The present study will pave a fresh strategy for exploring advanced high-power anode materials for sodium ion batteries.

关键词： Transition metal phosphide hollow structure Anode:High-rate capability Sodium ion battery

Rational design of a hollow porous structure for enhancing diffusion kinetics of K ions in edge-nitrogen doped carbon nanorods

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Nano Research 2022年第9期15卷 8109-8117页

作者： Ping Niu Yang Yang Zhiqiang Li Gaohui Ding Lingzhi Wei Ge Yao Helin Niu Yulin Min Fangcai Zheng Qianwang Chen Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid MaterialsAnhui UniversityMinistry of EducationHefei 230601China Hefei National Laboratory for Physical Science at Microscale and Department of Materials Science&Engineering University of Science and Technology of ChinaHefei 230026China Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province Anhui UniversityHefei 230601China Shanghai Key Laboratory of Materials Protection and Advanced Materials Electric Power Shanghai Engineering Research Center of Energy-Saving in Heat Exchange SystemsShanghai University of Electric PowerShanghai 200090China

The high electrical conductivity makes it possible for one-dimensional(1D)carbon materials to be used as the promising anodes for potassium ion batteries(PIBs),however,the sluggish diffusion kinetics caused by large-sized potassium ions(K^(+))limits their practical applications in energy storage systems.In this work,hollow carbon nanorods were rationally designed as a case to verify the superiority of 1D hollow structure to improve the diffusion kinetics of K^(+).Simultaneously,edge-N(pyridinic-N and pyrrolic-N)atoms were also introduced into 1D hollow carbon structure,which can provide ample active sites and defects in graphitic lattices to adsorb K^(+),providing extra capacitive storage capacity.As expected,the optimized edge-N doped hollow carbon nanorods(ENHCRs)exhibits a high reversible capacity of 544 mAh·g^(−1)at 0.1 A·g^(−1)after 200 cycles.Even at 5 A·g^(−1),it displays a long-term cycling stability with 255 mAh·g^(−1)over 10,000 cycles.The electrochemical measurements confirm that the hollow structure is favorable to improve the transfer kinetics of K^(+)during cycling.And the theoretical calculations demonstrate that edge-N doping can enhance the local electronegativity of graphitic lattices to adsorb much more K^(+),where edge-N doping synergizes with 1D hollow structure to achieve enhanced K^(+)-storage performances.

关键词： carbon materials edge-nitrogen hollow structure theoretical calculation batteries

Understanding oxygen vacant hollow structure CeO_(2)@In_(2)O_(3) heterojunction to promote CO_(2) reduction

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Rare Metals 2023年第6期42卷 1888-1898页

作者： Qi-Jun Xu Jing-Wen Jiang Xiao-Feng Wang Ling-Yan Duan Hong Guo School of Materials and Energy Yunnan Key Laboratory for Micro/Nano Materials and TechnologyYunnan UniversityKunming650091China

In order to reduce the impact of greenhouse gases,we have studied a new and efficient photocatalyst to reduce CO_(2).We recombined the hollow CeO_(2) with the In_(2)O_(3) and introduced the oxygen vacancy to obtain the CeO_(2)@In_(2)O_(3) for the hollow structure of the oxygen vacancy.The test results show that CeO_(2)@In_(2)O_(3) with oxygen vacancy hollow structure(hereinafter collectively referred to as H-CeO_(2),H-In_(2)O_(3),and H-CeO_(2-x)@In_(2)O_(3-x))have higher photocatalytic reduction activity of CO_(2) than hollow CeO_(2) and hollow In_(2)O_(3).When the illumination time was 4 h,the yields of carbon dioxide reduction to CO and methane were 38.7 and 7.8 μmol·g^(-1),respectively.Consequently,we explained the photocatalytic reduction mechanism,and carried out the X-ray diffraction(XRD)and in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS) analysis of H-CeO_(2),H-In_(2)O_(3),and H-CeO_(2-x)@In_(2)O_(3-x).This study summarizes some experience for the study of oxygen vacancy hollow structure photocatalyst,and provides some new ideas in the field of photocatalytic reduction of CO_(2).

关键词： H-CeO_(2-x)@ln_(2)O_(3-x) Oxygen vacancy hollow structure Photocatalytic CO_(2)reduction

Fabrication and Applications of Multi-Fluidic Electrospinning Multi-structure hollow and Core–Shell Nanofibers

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Engineering 2022年第6期8卷 116-127页

作者： Dianming Li Guichu Yue Shuai Li Jing Liu Huaike Li Yuan Gao Jingchong Liu Lanlan Hou Xiaofeng Liu Zhimin Cui Nü Wang Jie Bai Yong Zhao Key Laboratory of Bioinspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191China School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China College of Chemical Engineering Inner Mongolia University of TechnologyHohhot 010051China

Recently,electrospinning(ESP)has been widely used as a synthetic technology to prepare nanofibers with unique properties from various raw materials.The applications of functionalized nanofibers have gradually developed into one of the most exciting topics in the field of materials science.In this review,we focus on the preparation of multi-structure fibrous nanomaterials by means of multi-fluidic ESP and review the applications of multi-structure nanofibers in energy,catalysis,and biology.First,the working principle and process of ESP are introduced;then,we demonstrate how the microfluidic concept is com-bined with the ESP technique to the multi-fluidic ESP technique.Subsequently,the applications of multi-structure nanofibers in energy(Li^(+)/Na^(+)batteries and Li–S batteries),hetero-catalysis,and biology(drug delivery and tissue engineering)are introduced.Finally,challenges and future directions in this emerging field are summarized.

关键词： Electrospinning Microfluidics Multi-fluidic hollow structure Nanofibers

Crystalline/Amorphous Heterophase with Self-Assembled hollow structure for Highly Efficient Electrochemical Hydrogen Production

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CCS Chemistry 2022年第10期4卷 3391-3401页

作者： Zhengqing Liu Kunkun Nie Yanling Yuan Binjie Li Pei Liu Shaokun Chong Yaping Du Wei Huang Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)Xi’an Institute of Biomedical Materials and EngineeringNorthwestern Polytechnical UniversityXi’an 710129 School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710072 Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsSchool of Materials Science and Engineering&National Institute for Advanced MaterialsNankai UniversityTianjin 300350

Heterophase nanomaterials composed of multiple phases have attracted increasing attention due to their enhanced performance in electrocatalytic field.Nevertheless,constructing two-dimensional(2D)crystalline/amorphous heterophase nanostructures with the samechemical composition remains a great challenge.Herein,we report the preparation of a 2D crystalline/amorphous heterophase of MoS2 nanosheets with the same elemental components via a facile solvothermal method.

关键词： amorphous heterophase hollow structure hydrogen evolution reaction

Magnetic nanoparticle-modified hollow double-shell SiC@C@FeCo with excellent electromagnetic wave absorption

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Nano Research 2024年第4期17卷 3164-3174页

作者： Guiyu Peng Jintang Zhou Jiaqi Tao Weize Wang Jun Liu Junru Yao Yijie Liu Zhengjun Yao College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information TechnologyNanjing 211100China

Integrated micro and nanostructures,heterogeneous components,defects,and interfaces is the way to develop high-performance microwave absorbing materials.However,there still needs to be more precise experimental routes and effective validation.In this work,by a continuous process of vacuum sintering,hydrothermal,and carbon thermal reduction,magnetic FeCo nanoparticles were successfully embedded on the hollow double-shell mesoporous SiC@C surface,thus solving the challenges of a single component loss mechanism.The hollow double-shell nanostructure introduces air to enhance impedance matching while significantly reducing the density of the material.The extensive defects and heterogeneous grain boundaries effectively enhance the polarization loss capacity.The magnetic loss mechanism introduced by the magnetic particles effectively improves the impedance matching properties of the material.The synergy of these multiple advantages has enabled the SCFC_(2)-8(here SiC@C@FeCo is abbreviated to SCFC,2 represents the initial metal ion content,and 8 represents the hydrothermal time)sample to achieve an adequate absorption bandwidth of 6.09 GHz at 2.0 mm.With a minimum reflection loss of-60.56 dB,the absorption bandwidth can cover the entire C,X,and Ku bands by adjusting the matching thickness(1.3–4.0 mm).This work provides a valuable paradigm for the deeper exploitation of microwave absorption potential and guides the development of other high-performance materials.

关键词： SiC@C@FeCo(SCFC)composites core–shell hollow structure microwave absorption

hollow FeCoNiAl microspheres with stabilized magnetic properties for microwave absorption

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Nano Research 2024年第3期17卷 2079-2087页

作者： Linhe Yu Gangjie Lian Guozhen Zhu Sue Ren Yanfang Du Xuhui Xiong Rui Chen Jincang Zhang Wenbin You Renchao Che Institute of Advanced Materials College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438China Zhejiang Laboratory Hangzhou 311100China Capital Aerospace Machinery Corporation Limited Beijing 100000China AECC Beijing Institute of Aeronautical Materials Beijing 100095China International Center for Quantum and Molecular structures Materials Genome InstitutePhysics DepartmentShanghai UniversityShanghai 200444China

Development of high-performance microwave absorption materials(MAM)with stabilized magnetic properties at high temperatures is specifically essential but remains challenging.Moreover,the Snoke's limitation restrains the microwave absorption(MA)property of magnetic materials.Modulating alloy components is considered an effective way to solve the aforementioned problems.Herein,a hollow medium-entropy FeCoNiAl alloy with a stable magnetic property is prepared via simple spray-drying and two-step annealing for efficient MA.FeCoNiAl exhibited an ultrabroad effective absorption band(EAB)of 5.84 GHz(12.16–18 GHz)at a thickness of just 1.6 mm,revealing an excellent absorption capability.Furthermore,the MA mechanism of FeCoNiAl is comprehensively investigated via off-axis holography.Finally,the electromagnetic properties,antioxidant properties,and residual magnetism at high temperatures of FeCoNiAl alloys are summarized in detail,providing new insights into the preparation of MAM operating at elevated temperatures.

关键词： microwave absorption hollow structure magnetic stability multiple microwave absorption mechanism

Magneto-electric integrated design strategy of NiCo@C composites for synergistic absorption and conversion in mid-high frequency microwaves

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Nano Research 2024年第4期17卷 2205-2215页

作者： Yijie Liu Jintang Zhou Xiaoxuan He Lvtong Duan Yucheng Wang Zhenyu Cheng Zhengjun Yao College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information TechnologyNanjing 211100China

Achieving synergistic absorption of electromagnetic waves(EMWs)in the mid-high frequency and absorption band conversion is an urgent problem.However,the present solution is usually a straightforward mixture of magnetic component-carbon component.Hereby,we optimize the magnetic properties and electrical relaxation response from a chemical synthesis perspective.Through integrated design,the contents of carbon components and multi-dimensional morphology are controlled by retaining strong magnetic properties.The morphology design and the construction of heterogeneous interfaces will boost the intense response of charge in the surrounding to enhance the polarization effect.The multi-dimensional structure and electromagnetic(EM)properties of the sample after optimized engineering have an extremely powerful absorption conversion effect on EMW energy.NiCo@C particles ultimately achieve synergistic absorption effects at low thickness(d<3.5 mm)at middle frequencies(6–10 GHz)and high frequencies(10.5–18 GHz).Our work establishes a correlation mechanism between the physical and chemical properties of materials and EM parameters.It also provides insight into the synergistic absorption of EMWs in the mid-high frequency and absorption band conversion strategies.

关键词： micro-nano composites NiCo@C hollow structure mid-high frequency absorption

Novel self-assembled porous yolk-shell NiO nanospheres with excellent electrochromic performance for smart windows

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Particuology 2024年第1期84卷 72-80页

作者： Baoshun Wang Ya Huang Siming Zhao Run Li Di Gao Hairong Jiang Rufan Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing100084China

With the rapid development of optoelectronics,electrochromic(EC)materials(ECMs)with the advan-tages of low power consumption,easy viewing,high contrast ratio,etc have attached more and more attention from the fields of smart windows,electronic billboards,emerging wearable and portable electronics,and other next-generation displays.Nickel oxide(NiO)is a promising candidate for high-performance ECMs because of its neutral-colored states and low cost.However,NiO-based ECMs still face the problem of slow switching speed due to their low electrical conductivity and small lattice spacing.Metal-organic frameworks(MOFs)are promising candidates to fabricate hollow and porous transition metal oxides(TMOs)with high ion transport efficiency,excellent specific capacitance,and electrochemical activities.In this work,porous yolk-shell NiO nanospheres(PYS-NiO NSs)were syn-thesized via a solvothermal and subsequent calcination process of Ni-MOF,which exhibited outstanding EC performance.Because the large specific surface areas and hollow porous nanostructures were conducive to ionic transport,PYS-NiO NSs exhibited a fast coloring/bleaching speed(3.6/3.9 s per one coloring/bleaching cycle)and excellent cycling stability(82%of capacity retention after 3000 cycles).These superior EC properties indicated that the PYS-NiO NSs was a promising candidate for high-performance EC devices.This work provides a new and feasible strategy for the efficient preparation of TMOs ECMs with good EC performance,especially fast switching speed.

关键词： Electrochromic Nickel oxide Metal-organic frameworks hollow structure Smart windows