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Manipulating Dendritic Structures via Diffusion and Reaction

Manipulating Dendritic Structures via Diffusion and Reaction

The 6th International Conference on Nanoscience and Technology, China 2015 (第六届中国国际纳米科学技术会议)

作者： Tao Yang Yongsheng Han Jinghai Li Center of Mesoscience State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Science Beijing 100190 China

A dendrite is one of the most aesthetically pleasing structures, with the best-known example being snowflakes. Dendritic structures also include dendrites in alloys, neural systems and structures in nanomaterials. Although the formation of dendrites has been studied for centuries, the practical technique to control their growth is limited. Here we report an attempt to manipulate the growth of dendritic structures via controlling chemical diffusion and reaction.

关键词： Shape control Dendritic structure Silver Diffusion Reaction

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Phase transfer-based high-efficiency recycling of precious metal electrocatalysts

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Green Chemical Engineering 2024年第1期5卷 68-74页

作者： Qing Zeng Shaonan Tian Yu Zhang Hui Liu Dong Chen Xinlong Tian Chaoquan Hu Jun Yang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing100190China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou570228China Nanjing IPE Institute of Green Manufacturing Industry Nanjing211100China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China

Recycling precious metals with high-efficiency is undoubtedly beneficial to optimize resource utilization for environmental remediation and sustainable ***,we report an efficient route to recycle the palladium(Pd)and platinum(Pt)electrocatalysts using a phase transfer *** strategy involves acidic dissolution of deactivated precious metal(Pd/Pt)electrocatalysts from their loading substrates,mixing with an ethanolic solution of dodecylamine(DDA),subsequent extraction of metal ions into a non-polar organic phase,and final reduction by sodium borohydride to reproduce high-performance electrocatalysts towards typical electrochemical reactions,e.g.,oxygen reduction reaction(ORR)and ethanol oxidation reaction(EOR).In specific,the transfer efficiencies are up to 98%and the final recovery rate is over 85%for Pd and Pt electrocatalysts in each *** approach symbolizes a facile and efficient way to recover precious metals,which might be applied to recycling a wide range of metals in various realms after appropriate modifications.

关键词： Precious metal Phase transfer Extraction Recovery Electrocatalyst

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Heterogeneous nanocomposites consisting of Pt_(3)Co alloy particles and CoP_(2) nanorods towards high-efficiency methanol electro-oxidation

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SmartMat 2021年第2期2卷 234-245页

作者： Niuwa Yang Dong Chen Penglei Cui Tingyu Lu Hui Liu Chaoquan Hu Lin Xu Jun Yang State Key Laboratory of Multiphase Complex Systems Chinese Academy of SciencesBeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Nanjing IPE Institute of Green Manufacturing Industry NanjingJiangsuChina Jiangsu Key Laboratory of New Power Batteries School of Chemistry and Materials ScienceNanjing Normal UniversityNanjingJiangsuChina

Heterogeneous nanocomposites comprising chemically distinct constituents are particularly promising in *** herein report a synthetic strategy that combines the reduction of Pt and Co ionic precursors at an appropriate ratio with the subsequent phosphating at an elevated temperature for forming heterogeneous nanocomposites consisting of quasi-spherical Pt_(3)Co alloy domains and rod-like CoP_(2) domains for high-efficiency methanol *** strong electronic coupling between Pt_(3)Co and CoP_(2) domains in the nanocomposites render the electron density around Pt atoms to decrease,which is favorable for reducing the adsorption of poisoning CO-like intermediates on the catalyst ***,the as-prepared heterogeneous Pt_(3)Co–CoP_(2) nanocomposites show good performance for methanol electrooxidation both in acidic and alkaline *** specific,at a Pt loading of only 6.4%on a common carbon substrate,the mass-based activity of Pt_(3)Co–CoP_(2) nanocomposites in an acidic medium is about 2 and 1.5 times as high as that of commercial Pt/C catalyst(20%mass loading)and home-made Pt_(3)Co alloy nanoparticles(8.0%mass loading),while in the alkaline medium,these values are 3 and 2,respectively.

关键词： electrocatalysis electronic coupling methanol electro-oxidation nanocomposite Pt_(3)Co-CoP_(2)

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Hollow MO_x-RuO_2(M=Co,Cu,Fe,Ni,CuNi)nanostructures as highly efficient electrodes for supercapacitors

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Science China Materials 2016年第5期59卷 323-336页

作者：谭强强王鹏飞刘卉徐宇兴陈运法杨军 State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Center for Mesoscience Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Engineering the internal structure and chemical composition of nanomaterials in a cost-effective way has been challenging, especially for enhancing their performance for a given application. Herein, we report a general strategy to fabricate hollow nanostructures of ruthenium-based binary or ternary oxides via a galvanic replacement process together with a subsequent thermal treatment. In particular,the as-prepared NiO-RuO_2 hollow nanostructures loaded on carbon nanotubes(hNiO-RuO_2/CNT) with RuO_2 mass ratio at 19.6% for a supercapacitor adopting the KOH electrolyte exhibit high specific capacitances of 740 F g^(-1) at a constant current density of 1 A g^(-1) with good cycle stability. The specific capacitance for hNiO-RuO_2/CNT electrodes maintains638.4 F g^(-1) at a current density of 5 A g^(-1). This simple approach may shed some light on the way for making a wide range of metal oxides with tunable nanostructures and compositions for a variety of applications.

关键词： ruthenium-based oxides hollow nanostructures galvanic replacement reaction supercapacitor specific capacitance

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Acetic acid-assisted mild dealloying of fine CuPd nanoalloys achieving compressive strain toward high-efficiency oxygen reduction and ethanol oxidation electrocatalysis

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Carbon Energy 2023年第7期5卷 112-120页

作者： Danye Liu Yu Zhang Hui Liu Peng Rao Lin Xu Dong Chen Xinlong Tian Jun Yang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijingChina State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikouChina Jiangsu Key Laboratory of New Power Batteries School of Chemistry and Materials ScienceJiangsu Collaborative Innovation Centre of Biomedical Functional MaterialsNanjing Normal UniversityNanjingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Nanjing IPE Institute of Green Manufacturing Industry NanjingJiangsuChina

Dealloying by which the transition metal is partially or completely leached from an alloy precursor is an effective way to optimize the fundamental effects for further enhancing the electrocatalysis of a ***,to address the deficiencies associated with the commonly used dealloying methods,for example,electrochemical and sulfuric acid/nitric acid treatment,we report an acetic acid-assisted mild strategy to dealloy Cu atoms from the outer surface layers of CuPd alloy nanoparticles to achieve high-efficiency electrocatalysis for oxygen reduction and ethanol oxidation in an alkaline *** leaching of Cu atoms by acetic acid exerts an additional compressive strain effect on the surface layers and exposes more active Pd atoms,which is beneficial for boosting the catalytic performance of a dealloyed catalyst for the oxygen reduction reaction(ORR)and the ethanol oxidation reaction(EOR).In particular,for ORR,the CuPd nanoparticles with a Pd/Cu molar ratio of 2:1 after acetic dealloying show a half-wave potential of 0.912 V(***)and a mass activity of 0.213 AmgPd^(-1) at 0.9 V,respectively,while for EOR,the same dealloyed sample has a mass activity and a specific activity of 8.4 Amg^(-1) and 8.23 mA cm^(-2),respectively,much better than their dealloyed counterparts at other temperatures and commercial Pd/C as well as a Pt/C catalyst.

关键词： compressive strain effect dealloying electrocatalysis ethanol oxidation reaction oxygen reduction reaction

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Mechanical,corrosion and magnetic behavior of a CoFeMn_(1.2)NiGa_(0.8) high entropy alloy

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Journal of Materials Science & Technology 2021年第14期73卷 139-144页

作者： Xiaoming Sun Lingzhong Du Hao Lan Jingyi Cui Liang Wang Runguang Li Zhiang Liu Junpeng Liu Weigang Zhang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing100190China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing100190China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China X-ray Science Division Argonne National LaboratoryArgonneIllinois60439USA Experimental Teaching and Equipment Management Center Qufu Normal UniversityShandong273165China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing100190China

In this study,a magnetic high entropy alloy(HEA)of CoFeMn_(1.2)NiGa_(0.8)was designed and prepared by arc melting in order to investigate its mechanical,corrosion and magnetic *** results show that the alloy mainly possesses body-centered cubic(BCC)phase and face-centered cubic(FCC)phase.A high compressive strength of 1450 MPa,a strain of 18.5%and a relatively low yield strength of 303MPa in as-cast condition at room temperature can be achieved in the present ***-situ high-energy X-ray diffraction technique was employed to reveal the deformation mechanism of Co Fe Mn_(1.2)Ni Ga_(0.8)under uniaxial compression and the results show that the competition between BCC phase and FCC phase plays a significant role during the compressive *** corrosion behavior of Co Fe Mn_(1.2)Ni Ga_(0.8)was investigated in 3.5 wt%Na Cl solution and it turned out that the alloy possessed good corrosion *** last,the magnetic behavior of the Co Fe Mn_(1.2)Ni Ga_(0.8)alloy was studied and it can present a high saturation magnetization of 94.5 emu/g and a coercivity of 26.4 Oe at 4 *** work indicates that the present Co Fe Mn_(1.2)Ni Ga_(0.8)HEA has promising applications as future magnetic functional materials.

关键词： High entropy alloys High-energy X-ray diffraction Compressive property Corrosion resistance Magnetic behavior

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High-performance enhancement-mode thin-film transistors based on Mg-doped In2O3 nanofiber networks

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Nano Research 2018年第3期11卷 1227-1237页

作者： Hongchao Zhang You Meng Longfei Song Linqu Luo Yuanbin Qin Ning Han Zaixing Yang Lei Liu Johnny C. Ho Fengyun Wang College of Physics and Cultivation Base for State Key Laboratory Qingdao University Qingdao 266071 China Center for Advancing Materials Performance from the Nanoscale State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Microelectronics and Center of Nanoelectronics Shandong University Jinan 250100 China Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China State Key Laboratory of Millimeter Waves City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China Shenzhen Research Institute City University of Hong Kong Shenzhen 518057 China

Although In2O3 nanofibers （NFs） are well-known candidates as active materials for next-generation, low-cost electronics, these NF based devices still suffer from high leakage current, insufficient on-off current ratios （Ion/Ioff）, and large, negative threshold voltages （VTH）, leading to poor device performance, parasitic energy consumption, and rather complicated circuit design. Here, instead of the conventional surface modification of In2O3 NFs, we present a one-step electrospinning process （i.e., without hot-press） to obtain controllable Mg-doped In2O3 NF networks to achieve high-performance enhancement-mode thin-film transistors （TFTs）. By simply adjusting the Mg doping concentration, the device performance can be manipulated precisely. For the optimal doping concentration of 2 mol%, the devices exhibit a small VTH （3.2 V）, high saturation current （1.1 × 10^-4 A）, large on/off current ratio （〉 10^8）, and respectable peak carrier mobility （2.04 cm2/（V.s））, corresponding to one of the best device performances among all 1D metal-oxide NFs based devices reported so far. When high-K HfOx thin films are employed as the gate dielectric, their electron mobility and VTH can be further improved to 5.30 cm^2/（V.s） and 0.9 V, respectivel）, which demonstrates the promising prospect of these Mg-doped In2O3 NF networks for high- performance, large-scale, and low-power electronics.

关键词： In2O3 nanofiber transistor doping threshold voltage enhancement mode

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Design and fabrication of 1-D semiconductor nanomaterials for high-performance photovoltaics

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Science Bulletin 2016年第5期61卷 357-367页

作者： Ning Han Zaixing Yang Lifan Shen Hao Lin Ying Wang Edwin Y.B.Pun Yunfa Chen Johnny C.Ho State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of SciencesBeijing 100190 China CAS Center for Excellence in Urban Atmospheric Environment Xiamen 361021 China Department of Physics and Materials Science City University of Hong Kong Hong Kong China State Key Laboratory of Millimeter Waves City University of Hong Kong Hong Kong China Shenzhen Research Institute City University of Hong KongShenzhen 518057 China Department of Electronic Engineering City University of Hong Kong Hong Kong China

To date, the cost-effective utilization of solar energy by photovoltaics for large-scale deployment remains challenging. Further cost minimization and efficiency maximization, through reduction of material consumption, simplification of device fabrication as well as optimization of device structure and geometry, are required. The usage of 1D nanomaterials is attractive due to the outstanding light coupling effect, the ease of fabrication, and integration with one-dimensional(1-D) semiconductor materials. The light absorption efficiency can be enhanced significantly, and the corresponding light-toelectricity conversion efficiency can be as high as their bulk counterparts. Also, the amount of active materials used can be reduced. This review summarizes the recent development of 1-D nanomaterials for photovoltaic applications, including the anti-reflection, the light absorption,the minority diffusion, and the semiconductor junction properties. With solid progress and prospect shown in the past 10 years, 1-D semiconductor nanomaterials are attractive and promising for the realization of high-efficiency and low-cost solar cells.

关键词： One-dimensional nanomaterials Photovoltaics Solar cells Light absorption Minority diffusion length Semiconductor junction

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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 ***,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 *** 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 *** dif-ference is that at high Cu ratios,the Cu shells no longer increase their thickness,but evolve into a dendritic ***,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 ***,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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Bi@C nanosphere anode with Na^(+)-ether-solvent cointercalation behavior to achieve fast sodium storage under extreme low temperatures

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Carbon Energy 2024年第9期6卷 325-337页

作者： Lingli Liu Siqi Li Lei Hu Xin Liang Wei Yang Xulai Yang Kunhong Hu Chaofeng Hou Yongsheng Han Shulei Chou School of Energy Materials and Chemical EngineeringHefei UniversityHefeiChina LIB Technology Center of Anhui Province Hefei UniversityHefeiChina School of Advanced Manufacturing Engineering Hefei UniversityHefeiChina State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijingChina Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhouChina

The low ion transport is a major obstacle for low-temperature(LT)sodium-ion batteries(SIBs).Herein,a core-shell structure of bismuth(Bi)nanospheres coated with carbon(Bi@C)is constructed by utilizing a novel Bi-based complex(1,4,5,8-naphthalenetetracarboxylic dianhydride as the ligand)as the precursor,which provides an effective template to fabricate Bi-based ***-40℃,the Bi@C anode achieves a high capacity,which is equivalent to 96%of that at 25℃,benefitting from the core-shell nanostructured engineering and Na^(+)-ether-solvent cointercalation *** special Na+-diglyme cointercalation behavior may effectively reduce the activation energy and accelerate the Na+diffusion kinetics,enabling the excellent low-temperature performance of the Bi@C *** expected,the fabricated Na_(3)V_(2)(PO_(4))_(3)//Bi@C full-cell delivers impressive rechargeability in the ether-based electrolyte at-40℃.Density functional theory calculations and electrochemical tests also reveal the fast reaction kinetic mechanism at LT,thanks to a much lower diffusion energy barrier(167 meV)and a lower reaction activation energy(32.2 kJ mol^(-1))of Bi@C anode in comparison with that of bulk *** work provides a rational design of Bi-based electrodes for rechargeable SIBs under extreme conditions.

关键词： bismuth core-shell structure low-temperature conditions sodium-ion batteries

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