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High performance flexible energy storage device based on copper foam supported NiMoO4 nanosheets-CNTs-CuO nanowires composites with core–shell holey nanostructure

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Journal of Materials Science & Technology 2021年第26期85卷 87-94页

作者： Pingping Yao Chenyang Li Jiali Yu Shuo Zhang Meng Zhang Huichao Liu Muwei Ji Guangtao Cong Tao Zhang Caizhen Zhu Jian Xu Institute of Low-dimensional Materials Genome Initiative College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen518060China Research Institute of Tsinghua University in Shenzhen ShenZhen518057China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing100084China

Because of the intensified electrochemical activities,mixed metal oxides as a representative for pseudocapacitive materials play a key role for high performance supercapacitor electrodes.Nevertheless,low ion and electron transfer rate and poor cycling performance in the electrode practically restrict further promotion of their electrochemical performance.In order to offset the defect,a novel copper(Cu)foamsupported nickel molybdate nanosheet decorated carbon nanotube wrapped copper oxide nanowire array(NiMoO4 NSs-CNTs-CuO NWAs/Cu foam)flexible electrode is constructed.The as-prepared electrode demonstrates a unique core-shell holey nanostructure with a large active surface area,which can provide a large number of active sites for redox reactions.Besides,the CNTs networks supply improved conductivity,which can hasten electron transport.Through this simple and efficient design method,the spatial distribution of each component in the flexible electrode is more orderly,short and fast electron transport path with low intrinsic resistance.As a result,the NiMoO4 NSs-CNTs-CuO NWAs/Cu foam as an adhesiveless supercapacitor electrode material exhibits excellent ene rgy storage perfo rmance with high specific areal capacitance of 23.40 F cm^(-2)at a current density of 2 mA cm^(-2),which outperforms most of the flexible electrodes re ported recently.The assembled asymmetric supercapacitor demonstrates an energy density up to 96.40 mW h cm^(-3)and a power density up to 0.4 W cm^(-3)under a working voltage window of 1.7 V.In addition,outstanding flexibility of up to 100°bend and good cycling stability with the capacitance retention of 82.53%after 10,000 cycles can be obtained.

关键词： Supercapacitor Binary metal oxide Flexible electrode Pseudocapacitive material core-shell nanostructure

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Plasmon-enhanced photocatalytic oxidative coupling of amines in the air using a delicate Ag nanowire@NH_(2)-UiO-66 core-shell nanostructures

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Chinese Chemical Letters 2024年第4期35卷 506-510页

作者： Yuan Zhang Shenghao Gong A.R.Mahammed Shaheer Rong Cao Tianfu Liu Fujian Science Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

MOF-based core-shell structures with high surface area, abundant active sites, and broad absorption bands are viable alternatives to traditional single-component photocatalysts. In this report, we describe the design and construction of delicate Ag nanowires@NH_(2)-UiO-66 with a core-shell structure for use as photocatalysts in imine synthesis under light. The optimized composites exhibited 80% imine production, which was higher than both MOF and Ag NWs. The significant improvement in photocatalytic activity under light may be attributed to the plasmonic effect of silver nanowires and their core-shell structure, which promotes the separation of electron-hole pairs. Moreover, the photocatalytic activity of the core-shell nanostructure may provide valuable insight into the design and construction of MOF-based composite photocatalysts for oxidative coupling of amines.

关键词： Metal-organic frameworks Plasmonic silver nanowires Photocatalyst core-shell nanostructure Oxidative coupling of amines

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A core-shell nanostructure Ensures High Gene Transfection Efficacy and Minimal Cytotoxicity

A Core-shell Nanostructure Ensures High Gene Transfection Ef...

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2014年全国高分子材料科学与工程研讨会

作者： WANG Fei CHENG Yiyun Shanghai Key Laboratory of Regulatory Biology School of Life SciencesEast China Normal University

Cationic dendrimers and polyethyleneimine（PEI）have been widely investigated both in vitro and in vivo.Generally,high generation dendrimer and high molecular weight PEI possess relatively high transfection efficacy,but they are associated with serious cytotoxicity during gene transfection.In comparison,low generation dendrimer and low molecular weight PEI has good biocompatibility but poor transfection efficacy.To break up the correlation between transfection efficacy and cytotoxicity for these cationic polymers,we design a core-shell nanostructure in which the complex of high generation（generation 8,G8） polyamidoamine dendrimer and plasmid DNA acts as a negatively charged core and low molecular weight polymer such as 1.8kD LPEI,2.5 kD bPEI or G2 dendrimer as the shell.The core-shell nanostructure with a 1.8kD LPEI or 2.5 kD bPEI shell has a small size below 200 nm which is suitable for gene transfection Attachment of cationic shell on the G8/DNA core turns the complex charge from negative to positive.The core-shell nanostructure with 1.8kD LPEI shell shows the highest transfection efficacy compared with nanostructures with 2.5 kD bPEI and G2 dendrimer shells.Such a core-shell nanostructure fulfills the two main requirements-high transfection efficacy and low cytotoxicity in gene delivery.

关键词： core-shell nanostructure dendrimer polyethyleneimine gene delivery

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Noble metal-free core-shell CdS/iron phthalocyanine Z-scheme photocatalyst for enhancing photocatalytic hydrogen evolution

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Journal of Materials Science & Technology 2022年第20期115卷 199-207页

作者： Weijie Zhang Xizhong Zhou Jinzhao Huang Shouwei Zhang Xijin Xu School of Physics and Technology University of JinanJinan 250022China

Improving the separation efficiency of photogenerated carriers and broadening the light absorption range of the photocatalyst are two important factors for improving the performance of the photocatalyst.In this paper,a new and efficient Z-scheme Cd S/iron phthalocyanine(Cd S/Fe Pc)core-shell nanostructure composite material is prepared by a simple solid-phase reaction method.There are two key points in the preparation of composite materials:one is that hydrogen bonding energy is closely connected with Fe Pc,another is that Fe Pc can be uniformly assembled on Cd S nanoparticles.The photocatalytic hydrogen evolution(PHE)of the Cd S/Fe Pc nanocomposite(73.01μmol/h)is 2.6 times higher than that of pure Cd S(26.67μmol/h).In addition,after 4 photocatalytic cycles,the PHE of the Cd S/Fe Pc composite is still 92.3%of the first cycle.There are three reasons for this situation:(1)The Z-scheme heterojunction is formed to improve the separation efficiency of photogenerated carriers;(2)Fe Pc expands the visible light absorption range of Cd S;(3)The large core-shell contact area is favorable for the separation of photo-induced carriers at the interfaces.This research is conducive to the further development of new photocatalytic materials with high efficiency,low cost and simple preparation.

关键词： CdS/FePc core-shell nanostructure Photocatalytic hydrogen evolution Z-scheme heterojunction

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Carbon nanofilm stabilized twisty V_(2)O_(3)nanorods with enhanced multiple polarization behavior for electromagnetic wave absorption application

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Journal of Materials Science & Technology 2022年第24期119卷 37-44页

作者： Siyao Cheng Cheng Zhang Hao Wang Jinrui Ye Yan Li Qiu Zhuang Wei Dong Aming Xie School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China School of Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China Institute of Science and Technology Beihang UniversityBeijing 100191China

Vanadium(V)oxides exhibit low electrical conductivity and poor polarization properties,especially in that V_(2)O_(3)has low stability and is easily oxidized to higher valence V oxides.To solve this problem,we herein provide a two-step strategy for the synthesis of carbon nanofilm stabilized twisty V_(2)O_(3)nanorods(V_(2)O_(3)@C),including a hydrothermal reaction and a controlled pyrolysis process.Conductivity tests and electron-spin resonance(ESR)spectra indicate that the coating of carbon nanofilm not only enhances the electrical conductivity but also generates abundant defects.The electromagnetic waves absorption(EMA)results suggest that V_(2)O_(3)@C exhibits excellent EMA performance at ultra-low thickness,where the effective absorption bandwidth gets to 7.21 GHz at 1.7 mm and the maximal absorption reaches–56 d B.Enhanced conductivity loss and improved multiple polarization relaxation were used to illustrate the absorbing mechanism of V_(2)O_(3)@C.This work provides new insights into the design of advanced nanocomposites for EMA applications.

关键词： Vanadium oxides V_(2)O_(3)@C nanorod core-shell nanostructure Electromagnetic wave absorption Interfacial polarization

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Unraveling the Role of Nitrogen-Doped Carbon Nanowires Incorporated with MnO_(2)Nanosheets as High Performance Cathode for Zinc-Ion Batteries

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Energy & Environmental Materials 2023年第3期6卷 205-213页

作者： Xiaohui Li Qiancheng Zhou Ze Yang Xing Zhou Dan Qiu Huajun Qiu Xintang Huang Ying Yu Institute of Nanoscience and Technology College of Physical Science and TechnologyCentral China Normal UniversityWuhan 430079China State Key Laboratory of Advanced Technology for Materials Synthesis and processing Wuhan University of Technology Wuhan 430070China

Manganese-based cathode materials are considered as a promising candidate for rechargeable aqueous zinc-ion batteries(ZIBs).Suffering from poor conductive and limited structure tolerance,various carbon matrix,especially N-doped carbon,were employed to incorporate with MnO_(2)for greatly promoted electrochemical performances.However,the related underlying mechanism is still unknown,which is unfavorable to guide the design of high performance electrode.Herein,by incorporating layered MnO_(2)with N-doped carbon nanowires,a free-standing cathode with hierarchical core-shell structure(denoted as MnO_(2)@NC)is prepared.Benefiting from the N-doped carbon and rational architecture,the MnO_(2)@NC electrode shows an enhanced specific capacity(325 mAh g^(−1)at 0.1 A g^(−1))and rate performance(90 mAh g^(−1)at 2 A g^(−1)),as well as improved cycling stability.Furthermore,the performance improvement mechanism of MnO_(2)incorporated by N-doped carbon is investigated by X-ray photoelectron spectroscopy(XPS),Raman spectrums and density functional theory(DFT)calculation.The N atom elongates the Mn-O bond and reduces the valence of Mn^(4+)ion in MnO_(2)crystal by delocalizing its electron clouds.Thus,the electrostatic repulsion will be weakened when Zn^(2+)/H^(+)insert into the host MnO_(2)lattices,which is profitable to more cation insertion and faster ion transfer kinetics for higher capacity and rate capability.This work elucidates a fundamental understanding of the functions of N-doped carbon in composite materials and shed light on a practical pathway to optimize other electrode materials.

关键词： core-shell nanostructure MnO_(2)nanosheets N-doped carbon Zn ion batteries

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Enabling efficient NIR-II luminescence in lithium-sublattice core–shell nanocrystals towards Stark sublevel based nanothermometry

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Nano Research 2023年第1期16卷 1626-1633页

作者： Songbin Liu Zhengce An Jinshu Huang Bo Zhou National Rare Earth Functional Material Innovation Center Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi ProvinceCollege of Rare EarthsJiangxi University of Science and TechnologyGanzhou 341000China State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhou 510641China

The luminescence in the second near-infrared(NIR-II)spectral region(1,000–1,700 nm)has recently attracted great attention for emerging biological applications owing to its merit of deep tissue bioimaging and high spatiotemporal resolution.However,it still remains a challenge to achieve the highly efficient NIR-II emissions of lanthanides in nanomaterials.Herein,we report an ideal design of sensitizing lithium sublattice core–shell nanocrystals for efficient NIR-II emission properties from a set of lanthanide emitters including Er3+,Tm3+,Ho3+,Pr3+,and Nd3+.In particular,the typical NIR-II emission of Er3+at 1.5μm was greatly enhanced by further manipulating the energy transfer via Er3+–Ce3+cross-relaxation,and the quantum yield can reach up to 35.74%under 980 nm excitation(12.5 W·cm−2),which is the highest value to the best of our knowledge.The 808 nm responsive efficient NIR-II emission was also enabled at the single-particle level through rational core–shell–shell structure design.Moreover,the lithium-sublattice provides an obvious spectral Stark-splitting feature,which can be used in the ultrasensitive NIR-II nanothermometer with relative sensitivity of 0.248%K−1 and excellent thermal cycling stability.These results open a door to the research of new kinds of efficient NIR-II luminescent materials,showing great promise in various frontier fields such as deep tissue nanothermometry and in vivo bioimaging.

关键词： NIR-II lanthanides core-shell nanostructure Stark splitting nanothermometry

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Modulating the synergy of Pd@Pt core-shell nanodendrites for boosting methanol electrooxidation kinetics

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Journal of Materials Science & Technology 2023年第34期165卷 153-160页

作者： Hyeon Jeong Kim Cheol Joo Moon Seokhee Lee Jayaraman Theerthagiri Jong Wook Hong Myong Yong Choi Young Wook Lee Department of Chemistry and Research Institute of Natural Sciences Gyeongsang National UniversityJinju 52828Republic of Korea core-Facility Center for Photochemistry&Nanomaterials Gyeongsang National UniversityJinju 52828Republic of Korea Energy&Environment Division Korea Institute of Ceramic Engineering and Technology(KICET)Jinju 52851Republic of Korea Department of Chemistry University of UlsanUlsan 44610Republic of Korea Department of Education Chemistry and Research Institute of Natural Sciences Gyeongsang National UniversityJinju 52828Republic of Korea

The single-pot production of Pd@Pt core-shell structures is a promising approach as it offers large surface area,catalytic capability,and stability.In this work,we established a single-pot process to produce Pd@Pt core-shell nanodendrites with tunable composition,shape and size for optimal electrochemical activity.Pd@Pt nanodendrites with diverse compositions were synthesized by tuning the ratios of Pd and Pt sources in an aqueous environment using cetyltrimethylammonium chloride,which functioned as both the surfactant and the reducing agent at an elevated temperature(90°C).The synthesized Pd5@Pt5 nanodendrites showed exceptional electrochemical action toward the methanol oxidation reaction related with another compositional Pd@Pt nanodendrites and conventional Pt/C electrocatalysts.In addition,Pd5@Pt5 nanodendrites exhibited good CO tolerance owing to their surface features and the synergistic effect among Pt and Pd.Meanwhile,nanodendrites with a Pt-rich surface provided exceptional catalytic active sites.Compared with the conventional Pt/C electrocatalyst,the anodic peak current obtained by Pd5@Pt5 nanodendrites was 3.74 and 2.18 times higher in relations of mass and electrochemical active surface area-normalized current density,respectively.This approach offers an attractive strategy to design electrocatalysts with unique structures and outstanding catalytic performance and stability for electrochemical energy conversion.

关键词： core-shell nanostructure Pd@Pt electrocatalysis One-pot synthesis Formation mechanism of nanodendrites Methanol oxidation reaction

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core-shell gold-copper nanoparticles:Evolution of copper shells on gold cores at different gold/copper precursor ratios

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Chinese Journal of Structural Chemistry 2023年第11期42卷 32-39页

作者： Shaonan Tian Yu Zhang Qing Zeng Junyu Zhong Hui Liu Lin Xu Jun Yang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China State Key Laboratory of Bio-fibers and Eco-textiles Qingdao UniversityQingdao266071China School of Chemistry and Materials Science Jiangsu Key Laboratory of New Power BatteriesJiangsu Collaborative Innovation Centre of Biomedical Functional MaterialsNanjing Normal UniversityNanjing210023China

core-shell nanostructures usually exhibit tunable catalytic properties in comparison with their single core or shell counterpart due to electronic interaction and lattice strain between the core and shell regions.Herein,we report the intriguing evolution of copper(Cu)shells on the gold(Au)cores at different Au/Cu precursor ratios during the synthesis of core-shell Au-Cu nanoparticles at an organic medium via seed-mediated growth method.In brief,at relatively low Cu ratios,quasi-spherical Au-Cu nanoparticles with conventional core-shell structures are the majority products,in which the Cu shell thickness increases with the increase of Cu precursor ratios.The dif-ference is that at high Cu ratios,the Cu shells no longer increase their thickness,but evolve into a dendritic structure.Interestingly,the core-shell Au-Cu nanoparticles with dendritic Cu shells could be transformed into interesting Au-Cu cage-bell structures after a ripening process at elevated temperature.Further,through galvanic replacement reaction with Pt precursors,the thin Cu shells could be converted into CuPt alloy shells on the Au cores,which exhibit enhanced activity towards methanol oxidation reaction with satisfactory durability,in comparison with that of commercial Pt/C catalysts.

关键词： core-shell nanostructure Seed-mediated growth Electronic interaction Lattice strain Methanol oxidation reaction

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Tailoring structural properties of carbon via implanting optimal co nanoparticles in n-rich carbon cages toward high-efficiency oxygen electrocatalysis for rechargeable zn-air batteries

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Carbon Energy 2022年第4期4卷 576-585页

作者： Jie Yu Yawen Dai Zhenbao Zhang Tong Liu Siyuan Zhao Chun Cheng Peng Tan Zongping Shao Meng Ni Department of Building and Real Estate The Hong Kong Polytechnic UniversityKowloonHong KongChina Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefeiAnhuiChina State Key Laboratory of Materials-Oriented Chemical Engineering Department of Chemical EngineeringCollege of Chemical EngineeringNanjing Tech UniversityNanjingChina Department of Chemical Engineering Curtin UniversityPerthWestern AustraliaAustralia

Rational construction of carbon-based materials with high-efficiency bifunctionality and low cost as the substitute of precious metal catalyst shows a highly practical value for rechargeable Zn-air batteries(ZABs)yet it still remains challenging.Herein,this study employs a simple mixing-calcination strategy to fabricate a high-performance bifunctional composite catalyst composed of N-doped graphitic carbon encapsulating Co nanoparticles(Co@NrC).Benefiting from the core-shell architectural and compositional advantages of favorable electronic configuration,more exposed active sites,sufficient electric conductivity,rich defects,and excellent charge transport,the optimal Co@NrC hybrid(Co@NrC-0.3)presents outstanding catalytic activity and stability toward oxygen-related electrochemical reactions(oxygen reduction and evolution reactions,i.e.,ORR and OER),with a low potential gap of 0.766 V.Besides,the rechargeable liquid ZAB assembled with this hybrid electrocatalyst delivers a high peak power density of 168 mW cm^(−2),a small initial discharge-charge potential gap of 0.45 V at 10 mA cm^(−2),and a good rate performance.Furthermore,a relatively large power density of 108 mW cm^(−2) is also obtained with the Co@NrC-0.3-based flexible solid-state ZAB,which can well power LED lights.Such work offers insights in developing excellent bifunctional electrocatalysts for both OER and ORR and highlights their potential applications in metal-air batteries and other energy-conversion/storage devices.

关键词： Co nanoparticles core-shell nanostructure N-doped graphitic carbon oxygen electrocatalysis Zn-air battery

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