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Hierarchical porous yolk-shell Co-N-C nanocatalysts encaged in graphene nanopockets for high-performance Zn-air battery

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Nano Research 2023年第7期16卷 8893-8901页

作者： Yisi Liu Zongxu Li Shizhu Wang Jinnan Xuan Dongbin Xiong Lina Zhou Jianqing Zhou Jun Wang Yahui Yang Yue Du Institute for Advanced Materials Hubei Normal UniversityHuangshi 435002China Jiangsu Key Laboratory of Materials and Technology for Energy Conversion College of Material Science and EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China National&Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources College of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081China

The rational design and preparation of promising cathode electrocatalysts with excellent activity and strong stability for metal-air batteries is a huge challenge.In this work,we innovate an approach of combining solvothermal with high-temperature pyrolysis utilizing zeolitic imidazolate framework(ZIF)-8 and ZIF-67 as the template to synthesize a novel hybrid material of hierarchical porous yolk-shell Co-N-C polyhedron nanocatalysts engaged in graphene nanopocket(yolk-shell Co-N-C@GNP).The obtained catalyst exhibits prominent bifunctional electrocatalytic performance for oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)in the alkaline condition,in which the half-wave potential is 0.86 V for ORR,and the over-potential for OER is 0.42 V at 10 mA·cm^(-2).The rechargeable aqueous Zn-air battery fabricated with yolk-shell Co-N-C@GNP cathode deliveries an open circuit voltage(OCV)of 1.60 V,a peak power density of 236.2 mW·cm^(-2),and excellent cycling stability over 94 h at 5 mA·cm^(-2).The quasi-solid-state Zn-air battery(ZAB)using yolk-shell Co-N-C@GNP displays a high OCV of 1.40 V and a small voltage gap of 0.88 V in continuous cycling tests at 2 mA·cm^(-2).This work provides a valuable thought to focus attention on the design of high-efficient bifunctional catalysts with hierarchical porous yolk-shell framework and high-density metal active sites for metal-air battery technologies.

关键词： zeolitic imidazolate framework(ZIF)-67@ZIF-8 yolk-shell graphene nanopocket Bi-functional catalysts Zn-air battery

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yolk-shell Cu_(2)O@CuO-decorated RGO for High-Performance Lithium-Ion Battery Anode

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Energy & Environmental Materials 2022年第1期5卷 253-260页

作者： Fangzhao Pu Yilu Bai Jian Lv Xintian Zhao Guanchen Wu Chuncai Kong Bosen Lei Xiaojing Zhang Hong Jin Zhimao Yang MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter School of PhysicsXi’an Jiaotong UniversityShaanxi 710049China Xi’an Jiaotong University Suzhou Academy Suzhou 215123China

Based on the great advantages of an inner hollow structure and excellent solid counterpart capacity,complex hierarchical structures have been widely used as electrodes for lithium-ion batteries.Herein,hierarchical yolk-shell Cu_(2)O@Cu O-decorated RGO(YSRs)was designed and synthesized via a multistep approach.Octahedron-like Cu_(2)O-decorated RGO was firstly produced,in which GO was reduced slightly while cuprous oxide was synthesized.Subsequently,the controlled oxidation of Cu_(2)O@RGO led to the synthesis of special YSRs,which were composed of a solid Cu_(2)O core,spur-CuO,CuO shell,and RGO covered.As anode materials,YSRs could provide considerable capacity density.Meanwhile,the void existed between shells and solid active materials retaining the advantages of inner hollow structure.As a result,the unique architecture of the materials renders the composites with enhanced electronic and ionic diffusion kinetics,high specific capacity(~894 m Ah g^(-1),0.1 C),and an excellent rate capability.

关键词： copper oxide Cu_(2)O Li-ion battery nanocomposites yolk-shell

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Construction of oxygen defective ZnO/ZnFe_(2)O_(4) yolk-shell composite with photothermal effect for tetracycline degradation:Performance and mechanism insight

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Chinese Chemical Letters 2023年第1期34卷 452-456页

作者： Ke Zhang Hongyang Cao Afzal Dar Danqing Li Lina Zhou Chuanyi Wang School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China

Oxygen vacancy induced photothermal effect is of great significant but lack of adequate attentions for environmental remediation.In this paper,green recyclable ZnO/ZnFe_(2)O_(4) with oxygen vacancy was prepared by a solvothermal-calcination method.The UV-vis light capture ability of ZnO/ZnFe_(2)O_(4) microspheres is improved with the multiple light reflections due to the yolk-shell structure,and the oxygen vacancy expands the absorption range of photocatalyst and enhances photothermal conversion.The optimized photocatalyst can heat the solution from room temperature to 70°C within 60 min of visible light illumination,and the light to heat conversion efficiency is achieved by 61.3%.Compared with the degradation efficiency at 20°C,photothermal catalysis achieves a stable degradation in 80 min,and the degradation efficiency is increased by 41.5%.This can be attributed to the fact that light induced thermal energy accelerates the migration of electrons and holes,and promotes the diffusion of free radicals by heating active centers in situ.The active species contributing to the degradation,in order of importance,are the superoxide radical,hydroxyl radical,hole and electron.The light-to-thermal assisted photocatalysis with ZnO/ZnFe_(2)O_(4) provides a new sight for the pollution control in the future practical applications.

关键词： Photocatalysis Photothermal Oxygen vacancy yolk-shell Tetracycline

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Coral-Like yolk–shell-Structured Nickel Oxide/Carbon Composite Microspheres for High-Performance Li-Ion Storage Anodes

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Nano-Micro Letters 2019年第1期11卷 46-63页

作者： Min Su Jo Subrata Ghosh Sang Mun Jeong Yun Chan Kang Jung Sang Cho Department of Engineering Chemistry Chungbuk National University Department of Chemical Engineering Chungbuk National University Department of Materials Science and Engineering Korea University

In this study, coral?like yolk–shell?structured NiO/C composite microspheres(denoted as CYS?NiO/C) were prepared using spray pyrolysis. The unique yolk–shell structure was characterized, and the formation mechanism of the structure was proposed. Both the phase separation of the polyvinylpyrrolidone and polystyrene(PS) colloidal solution and the decompo?sition of the size?controlled PS nanobeads in the droplet played crucial roles in the formation of the unique coral?like yolk–shell structure. The CYS?NiO/C microspheres delivered a reversible discharge capacity of 991 mAh g^(-1) after 500 cycles at the current density of 1.0 A g^(-1). The dis?charge capacity of the CYS?NiO/C microspheres after the 1000 th cycle at the current density of 2.0 A g^(-1) was 635 mAh g^(-1), and the capacity retention measured from the second cycle was 91%. The final discharge capacities of the CYS?NiO/C microspheres at the current densities of 0.5, 1.5, 3.0, 5.0, 7.0, and 10.0 A g^(-1) were 753, 648, 560, 490, 440, and 389 mAh g^(-1), respectively. The synergetic e ect of the coral?like yolk–shell structure with well?defined interconnected mesopores and highly conductive carbon resulted in the excellent Li+?ion storage properties of the CYS?NiO/C microspheres.

关键词： yolk-shell Nickel oxide Carbon composite Anode materials Spray pyrolysis Lithium-ion batteries

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Exploiting oleic acid to prepare two-dimensional assembly of Si@graphitic carbon yolk-shell nanoparticles for lithium-ion battery anodes

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Nano Research 2019年第3期12卷 631-636页

作者： Xiao Chen Chen Chen Yu Zhang Xianfeng Zhang Dong Yang Angang Dong State Key Laboratory of Molecular Engineering of Polymer and Department of Macromolecular Science Fudan University Shanghai 200433 China Chem Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Department of Chemistry Fudan University Shanghai 200433 China

Carbon coati ng has bee n a routi ne strategy for improvi ng the performa nee of Si-based anode materials for lithium-ion batteries. The ability to tailor the thick ness, homoge neity and graph itizati on degree of carb on-coati ng layers is esse ntial for addressi ng issues that hamper the real applicatio ns of Si anodes. Herein, we report the con structio n of two-dime nsional (2D) assemblies of intercon nected Si @ graphitic carb on yolk-shell nano particles (2D-Si@gC) from commercial Si powders by exploiting oleic acid (OA). The OA molecules act as both the surface-coati ng liga nds for facilitating 2D nano particle assembly and the precursor for forming uniform and conformal graphitic shells as thin as 4 nm. The as-prepared 2D-Si@gC with rationally designed void space exhibits excellent rate capability and cycling stability when used as anode materials for lithium-ion batteries, delivering a capacity of 1,150 mAh·g^-1 at an ultrahigh current density of 10 A·g^-1 and maintaining a stabilized capacity of 1,275 mAh·g^-1 after 200 cycles at 4 A·g^-1 The formatio n of yolk-shell nano particles 8nfines the depositi on of solid electrolyte in terphase (SEI) onto the outer carb on shell, while simulta neously providing sufficie nt space for volumetric expa nsion of Si nano particles. These attributes effectively mitigate the thickness variations of the entire electrode during repeated lithiation and delithiation, which combined with the unique 2D architecture and interc onn ected graphitic carbon shells of 2D-Si@gC contributes to its superior rate capability and cycling performa nee.

关键词： oleic acid self-assembly graphitic carbon yolk-shell nanoparticles Sianodes

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Porous yolk-shell structured Na_(3)(VO)_(2)(PO_(4))_(2)F microspheres with enhanced Na-ion storage properties

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Journal of Materials Science & Technology 2021年第24期83卷 83-89页

作者： Yameng Yin Cunyuan Pei Fangyu Xiong Yi Pan Xiaoming Xu Bo Wen Qinyou An State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen ValleyFoshan528200China

Na_(3)(VO)_(2)(PO_(4))_(2)F(NVPOF)has been considered as one potential candidate for sodium-ion batteries because of its high operating voltage and theoretical capacity.However,the poor intrinsic electronic conductivity significantly restricts its widespread application.In response to this drawback,we adopt the optimization strategy of tuning the morphology and structure to boost the electrical conductivity and mitigate the capacity fading.In this paper,NVPOF microspheres with unique porous yolk-shell structure were fabricated via a facile one-step solvothermal method for the first time.By monitoring the morphological evolution with time-dependent experiments,the self-sacrifice and Ostwald ripening mechanism from rough spheres to yolk-shell structure was revealed.Benefited from the favorable interwoven nanosheets shell,inner cavity and porous core structure,the resulting NVPOF electrode exhibits superior rate capability of 63 m A h g^(-1)at 20 C as well as outstanding long-cycling performance with the capacity retention up to 92.1%over 1000 cycles at 5 C.

关键词： yolk-shell Na_(3)(VO)_(2)(PO_(4))_(2)F Microspheres Synthesis mechanism Sodium-ion batteries

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The Bacteria Absorption-based yolk-shell Ni3P-Carbon @ Reduced Graphene Oxides for Lithium-Ion Batteries

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Journal of Renewable Materials 2021年第5期9卷 855-865页

作者： Yuhua Yang Ke Xu Bo Zhao Nana Liu Jun Zhou School of Materials and Mechanical&Electrical Engineering Jiangxi Science and Technology Normal UniversityNanchang330038China Jiangxi Key Laboratory of Surface Engineering Jiangxi Science and Technology Normal UniversityNanchang330038China College of Physical Science and Technology Yichun UniversityYichun336000China School of Communications and Electronics Jiangxi Science and Technology Normal UniversityNanchang330013

Traditional carbon layer enwrapping active materials cannot easily realize perfect cladding.Therefore,it still cannot prevent the pulverization of active materials during the course of charging/discharging.In this paper,we utilize natural bacteria to absorb nickel acetate,the active materials Ni3P nanoparticles are well enwrapped,as a natural organisms surviving for billions of years,their cell walls have a perfect carbon structure,and the cell walls become carbon layer through high annealing temperature.Based on this,the yolk-shell Ni3P–carbon@reduced graphene oxides paper is prepared,through a proper annealing temperature,the Ni3P particles disperse in the inner surface or both ends,so the active materials were prevented from dissolving into the electrolyte,so it may keep from invalidity during charging/discharging.The electrochemical performances display that it has stable and high capacities as Li-ion batteries(LIBs)anode.Its capacity can keep 200 cycles without any decrease,and especially its rate performance exhibits an excellent peculiarity,with the current density increasing from 400 to 1000 mA g^(−1) every 200 mA g^(−1),its capacities decrease only 9.8%,2.9%and 6.4%,and its can recover the same capacity when the current density comes back to 200 mA g^(−1).It may be a fine choice for LIBs.

关键词： Freestanding yolk-shell bacteria Ni3P Lithium-ion batteries

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yolk-shell Si/C composites with multiple Si nanoparticles encapsulated into double carbon shells as lithium-ion battery anodes

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Journal of Energy Chemistry 2019年第5期28卷 124-130页

作者： Le Hu Bin Luo Chenghao Wu Pengfei Hu Lianzhou Wang Haijiao Zhang Institute of Nanochemistry and Nanobiology Shanghai UniversityShanghai 200444China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQLD 4072Australia Laboratory of Microstructure Shanghai UniversityShanghai 200444China

The conceptual design of yolk-shell structured Si/C composites is considered to be an effective way to improve the recyclability and conductivity of Si-based anode materials. Herein, a new type of yolk-shell structured Si/C composite (denoted as TSC-PDA-B) has been intelligently designed by rational engineering and precise control. In the novel structure, the multiple Si nanoparticles with small size are successfully encapsulated into the porous carbon shells with double layers benefiting from the strong etching effect of HF. The TSC-PDA-B product prepared is evaluated as anode materials for lithium-ion batteries (LIBs). The TSC-PDA-B product exhibits an excellent lithium storage performance with a high initial capacity of 2108 mAh g^-1 at a current density of 100 mA g^-1 and superior cycling performance of 1113 mAh g^-1 over 200 cycles. The enhancement of lithium storage performance may be attributed to the construction of hybrid structure including small Si nanoparticles, high surface area, and double carbon shells, which can not only increase electrical conductiv让y and intimate electrical contact with Si nanoparticles, but also provide built-in buffer voids for Si nanoparticles to expand freely without damaging the carbon layer. The present findings can provide some scientific insights into the design and the application of advanced Si-based anode materials in energy storage fields.

关键词： Si/C composites yolk-shell Multiple Si nanoparticles Double carbon shells Energy storage

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From core-shell to yolk-shell:Keeping the intimately contacted interface for plasmonic metal@semiconductor nanorods toward enhanced near-infrared photoelectrochemical performance

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Nano Research 2020年第4期13卷 1162-1170页

作者： Xiaodong Wan Jia Liu Dong Wang Yuemei Li Hongzhi Wang Rongrong Pan Erhuan Zhang Xiuming Zhang Xinyuan Li Jiatao Zhang Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China

Here we report a synthetic strategy for controllable construction of yolk-shell and core-shell plasmonic metal@semiconductor hybrid nanocrystals through modulating the kinetics of sulfurization reaction followed by cation exchange.The yielded yolk-shell structured products feature exceptional crystallinity and more importantly,the intimately adjoined and sharp interface between plasmonic metal and semiconductor which facilitates efficient charge carrier communications between them.By exploiting the system composed of Au nanorods and p-type PbS as a demonstration,we show that the Au@PbS yolk-shell nanorods manifest notable improvement in visible and near infrared light absorption compared to the Au@PbS core-shell nanorods as well as hollow PbS nanorods.Moreover,the photocathode constituted by Au@PbS yolk-shell nanorods affords the highest photoelectrochemical activities both under simulated sunlight andλ>700 nm light irradiation.The superior performance of Au@PbS yolk-shell nanorods is considered arising from the combination of the favorable structural advantages of yolk-shell configuration and the surface plasmon resonance enhancement effect.We envision that the reported synthetic strategy can offer a valuable means to create hybrid nanocrystals with desirable structures and functions that enable to harness the photogenerated charge carriers,including the plasmonic hot holes,in wide-range solar-to-fuel conversion.

关键词： yolk-shell cation exchange surface plasmon resonance core-shell solar-to-fuel conversion

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yolk-shell nanostructural Ni_(2)P/C composites as the high performance electrocatalysts toward urea oxidation

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Chinese Chemical Letters 2021年第7期32卷 2222-2228页

作者： Yi Zhang Chundong Wang School of Optical and Electronic Information Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Green Chemical Process of Ministry of Education Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei ProvinceSchool of Chemical Engineering and PharmacyWuhan Institute of TechnologyWuhan 430073China Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

Highly active and low-cost catalytic electrodes for urea oxidation reaction(UOR)are always crucial for exploration of urea fuel cells.Herein,novel york-shell-structural Ni_(2)P/C na nosphere hybrids(Ni_(2)P/C-YS)are rationally constructed via a hydrothermal method and subsequent phosphidation treatment under different temperature ranging from 250℃to 450℃for UOR applications.In the in-situ constructed hollow york-shell structure,the coupling of conductive carbon materials and active Ni_(2)P allows numerous interfaces facilitating the electron transfer and thereby accelerating the catalytic kinetics.The results demonstrate that Ni_(2)P/C-YS-350 nanocomposite can boost the UOR process with a low potential of 1.366 V vs.RHE at a current density of 50 mA/cm^(2) in alkaline electrolyte and afford the superior durability with negligible potential decay after 23 h.This study presents that the carbon coated Ni_(2)P hybrid with the optimized crystallinities and hollow york-shell configurations can be a promising candidate for application in urea fuel cells.

关键词： Ni_(2)P/C yolk-shell Electrocatalysts Urea oxidation Nanosphere

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