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Two-dimensional(n = 1) ferroelectric film solar cells

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National Science Review 2023年第7期10卷 142-150页

作者： Chen Wang Jiahao Gu Jun Li Jianyu Cai Lutao Li Junjie Yao Zheng Lu Xiaohan Wang Guifu Zou College of energy Soochow Institute for Energy and Materials Innovations and Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University College of Mechanical and Electronic Engineering Shandong University of Science and Technology

Molecular ferroele ctrics that have excellent ferroelectric properties,a low processing temperature,narrow bandgap,and which are lightweight,have shown great potential in the photovoltaic field.However,two-dimensional(2D) perovskite solar cells with high tunability,excellent photo-physical properties and superior long-term stability are limited by poor out-of-plane conductivity from intrinsic multi-quantum-well electronic structures.This work uses 2D molecular ferroelectric film as the absorbing layer to break the limit of multiple quantum wells.Our 2D ferroelectric solar cells achieve the highest open-circuit voltage(1.29 V) and the best efficiency(3.71%) among the 2D(n=1) Ruddlesden-Popper perovskite solar cells due to the enhanced out-of-plane charge transport induced by molecular ferroelectrics with a strong saturation polarization,high Curie temperature and multiaxial characteristics.This work aims to break the inefficient out-of-plane charge transport caused by the limit of the multi-quantum-well electronic structure and improve the efficiency of 2D ferroelectric solar cells.

关键词： molecular ferroelectric film 2D perovskite ferroelectric film multiaxial ferroelectrics out-of-plane charge transport solar cell

泡沫镍上生长的具有三明治纳米结构的MnCo_(2)O_(4)@NiCoMnS_(4)用于高性能水系非对称超级电容器

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Science China materials 2024年第3期67卷 816-823页

作者：陈勇超李亚丽董云霞李东昊沈思锦胡继东付玉军贺德衍栗军帅 LONGi institute of Future technology and School of Materials&EnergyLanzhou UniversityLanzhou 730000China

本文介绍了一种由水热生长的MnCo_(2)O_(4)(MCO)纳米线以及随后电沉积的NiCoMnS_(4)(NCMS)纳米片组成的高性能超级电容器电极材料,即泡沫镍上生长的MCO@NCMS.由于其多孔和互联的纳米结构以及MCO和NCMS的协同效应,在1 mA cm^(-2)处实现了... 详细信息

本文介绍了一种由水热生长的MnCo_(2)O_(4)(MCO)纳米线以及随后电沉积的NiCoMnS_(4)(NCMS)纳米片组成的高性能超级电容器电极材料,即泡沫镍上生长的MCO@NCMS.由于其多孔和互联的纳米结构以及MCO和NCMS的协同效应,在1 mA cm^(-2)处实现了12,020.8 mF cm^(-2)的高电容,并展现出良好的倍率性能以及循环稳定性.电化学测试表明,组装成的水性非对称超级电容器在0.800 mW cm^(-2)的功率密度下,达到0.611 mW h cm^(-2)的高能量密度并具有良好的循环稳定性,即在15,000次充放电循环后,容量保持率可达90%,且保持100%的库仑效率.

关键词： sandwich structure high energy density transition metal sulfides aqueous asymmetric supercapacitor transition metal oxides

A 'Moore's law' for fibers enables intelligent fabrics

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National Science Review 2023年第1期10卷 68-86页

作者： Shengtai Qian Mingyang Liu Yuhai Dou Yoel Fink Wei Yan School of Electrical and Electronic Engineering Nanyang Technological University institute for energy materials Science University of Shanghai for Science and Technology Research Laboratory of Electronics Massachusetts Institute of Technology School of materials Science and Engineering Nanyang Technological University

Fabrics are an indispensable part of our everyday life.They provide us with protection,offer privacy and form an intimate expression of ourselves through their esthetics.Imparting functionality at the fiber level represents an intriguing path toward innovative fabrics with a hitherto unparalleled functionality and value.The fiber technology based on thermal drawing of a preform,which is identical in its materials and geometry to the final fiber,has emerged as a powerful platform for the production of exquisite fibers with prerequisite composition,geometric complexity and control over feature size.A ’Moore’ s law’ for fibers is emerging,delivering higher forms of function that are important for a broad spectrum of practical applications in healthcare,sports,robotics,space exploration,etc.In this review,we survey progress in thermally drawn fibers and devices,and discuss their relevance to ’smart’ fabrics.A new generation of fabrics that can see,hear and speak,sense,communicate,harvest and store energy,as well as store and process data is anticipated.We conclude with a critical analysis of existing challenges and opportunities currently faced by thermally drawn fibers and fabrics that are expected to become sophisticated platforms delivering value-added services for our society.

关键词： functional fibers fiber electronics and optoelectronics intelligent fabrics wearable electronics fabric computation human-interfaced bioelectronics

Composition design of high yield strength points in single-phase Co-Cr-Fe-Ni-Mo multi-principal element alloys system based on electronegativity,thermodynamic calculations,and machine learning

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Tungsten 2023年第1期5卷 169-178页

作者： Jiao-Hui Yan Zi-Jing Song Wei Fang Xin-Bo He Ruo-Bin Chang Shao-Wu Huang Jia-Xin Huang Hao-Yang Yu Fu-Xing Yin Research institute for energy Equipment materials School of Materials Science and EngineeringHebei University of TechnologyTianjin 300132China Tianjin Key Laboratory of materials Laminating Fabrication and Interface Control technology Tianjin 300132China institute for Advanced materials and technology University of Science and Technology BeijingBeijing 100083China

A method which combines electronegativity difference,CALculation of PHAse Diagrams(CALPHAD) and machine learning has been proposed to efficiently screen the high yield strength regions in Co-Cr-Fe-Ni-Mo multi-component phase diagram.First,the single-phase region at a certain annealing temperature is obtained by combining CALPHAD method and machine learning,to avoid the formation of brittle phases.Then high yield strength points in the single-phase region are selected by electronegativity difference.The yield strength and plastic deformation behavior of the designed Co_(14)Cr_(30)Ni_(50)Mo_(6)alloy are measured to evaluate the proposed method.The validation experiments indicate this method is effective to predict high yield strength points in the whole compositional space.Meanwhile,the interactions between the high density of shear bands and dislocations contribute to the high ductility and good work hardening ability of Co_(14)Cr_(30)Ni_(50)Mo_(6)alloy.The method is helpful and instructive to property-oriented compositional design for multi-principal element alloys.

关键词： High entropy alloys Multi-principal element alloys Yield strength Electronegativity difference CALculation of PHAse Diagrams Machine learning

Multiphysics numerical investigation of photothermal self-driving characteristics of SiO_(2)@Au Janus microparticles for drug delivery

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Particuology 2023年第5期76卷 165-175页

作者： Ying Liu Xinzhi Wang Yurong He School of energy Science and Engineering Harbin Institute of TechnologyHarbin150001China Heilongjiang Key Laboratory of New energy Storage materials and Processes School of Energy Science and EngineeringHarbin Institute of TechnologyHarbin50001China

The photothermal self-driving process of Janus microparticles has wide application prospects in the fields of biomedicine.Since silica and gold have good biocompatibility and high photothermal conversion efficiency,the SiO_(2)@Au Janus microparticles are widely used as drug carriers.Based on the multiphysics coupling method,the photothermal self-driving process of SiO_(2)@Au Janus microparticles was investi-gated,wherein the substrate was SiO_(2)particles and one side of the particles was coated with gold film.Under a continuous wave laser with irradiation of 20 W/cm^(2),the distance covered by the Janus particles was increased by increasing the thickness of the gold film and reducing the size of the SiO_(2)particles;the self-driving characteristics of the Janus particles were controlled substantially by increasing the intensity of the incident laser.Based on the simulation results,the thermophoretic motion and Brownian motion of particles can be measured by comparing the absolute values of the thermophoretic force impulse,Brownian force impulse,and drag force impulse.The Brownian force acting on Janus microparticles under low laser power cannot be ignored.Furthermore,the minimum laser power required for Janus particles to overcome Brownian motion was calculated.The results can effectively guide the design of Janus particles in biomedicine and systematically analyze the mechanism of particle thermophoretic motion during drug delivery.

关键词： Janus microparticles Photothermal self-driving Multiphysics coupling method Brownian

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层状钒酸钾应用于高性能高温钠离子电池

Science China materials 2022年第3期65卷 646-652页

作者：陈栋程亚飞潘洪革孙文平耿洪波芮先宏 School of materials and energy Guangdong University of TechnologyGuangzhou 510006China School of materials Engineering Changshu Institute of TechnologyChangshu 215500China institute of Science and technology for New energy Xi’an Technological UniversityXi’an 710021China School of materials Science and Engineering State Key Laboratory of Silicon MaterialsZhejiang UniversityHangzhou 310027China

在大规模储能领域中,高温钠离子电池(SIBs)受到了广泛关注.然而,较低的充放电效率和较差的循环稳定性仍是制约高温钠离子电池发展的主要因素.因此,开发性能优异的电极材料是高温钠离子电池发展的关键.本工作中,我们通过简单的钾离子插... 详细信息

在大规模储能领域中,高温钠离子电池(SIBs)受到了广泛关注.然而,较低的充放电效率和较差的循环稳定性仍是制约高温钠离子电池发展的主要因素.因此,开发性能优异的电极材料是高温钠离子电池发展的关键.本工作中,我们通过简单的钾离子插入法制备了KV_(3)O_(8)纳米带作为高温钠离子电池的负极材料.在60℃高温下,KV_(3)O_(8)纳米带表现出高的储钠容量(在0.1 A g^(-1)电流密度下,可逆容量为414 mAh g^(-1))、卓越的倍率性能(在20 A g^(-1)的高电流密度下为220 mA h g^(-1))和优异的循环稳定性(10 A g^(-1)的电流密度下循环1000次,容量几乎没有衰减).此外,通过非原位XRD分析发现,KV_(3)O_(8)纳米带的结构在整个充放电过程中未发生明显变化,进一步证实了其优异的稳定性.本研究表明KV_(3)O_(8)纳米带具有成为高温钠离子电池负极材料的潜力.

关键词：钠离子电池充放电过程负极材料充放电效率倍率性能循环稳定性原位XRD 电流密度

Facile synthesis of NiMn2S4 nanoflakes on nickel foam for high-performance aqueous asymmetric supercapacitors

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Science China(Technological Sciences) 2024年第2期67卷 499-508页

作者： ADIL Emin LI YaLi GAO Zhe DONG YunXia LI DongHao CHEN YongChao FU YuJun HE DeYan LI JunShuai LONGi institute of Future technology and School of Materials&EnergyLanzhou UniversityLanzhou 730000China

Supercapacitors display promising electrochemical performance with high power density and excellent cycle stability.However,their low energy density limits their advancement in a broader range of applications.To enhance their energy density,we proposed self-assembled spinel NiMn2S4nanoflakes grown on nickel foam which we successfully prepared by a facile hydrothermal method.The NiMn2S4electrode delivers a high capacitance of 2096.7 F g^(-1)at 1.0 A g^(-1),with an exceptional rate capability(~720.6 F g^(-1)at a very high current density of 100 A g^(-1))and good cycle stability(~85.1%retention of the initial capacitance after 7000 cycles with the Coulombic efficiency around 100%).The as-fabricated asymmetric supercapacitors based on NiMn2S4nanoflakes//active carbon demonstrate an energy density of 73.6 W h kg^(-1)at 800.5 W kg^(-1)and adequate cycling performance of~84.6%capacitance retention at 15 A g^(-1)after 10000 cycles.The results reveal that the nanostructured NiMn2S4is an excellent electrode material for high-performance energy storage applications.

关键词： NiMn2S4 nanostructure high capacitance aqueous supercapacitors long cycle stability high energy density

In situ growth of NiS_(2) nanosheet array on Ni foil as cathode to improve the performance of lithium/sodium-sulfur batteries

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Science China(Technological Sciences) 2022年第1期65卷 231-237页

作者： FAN MouPing CHEN YuanMao KE Xi HUANG ZeXi CHEN YouChen WU WenLi QU XiaoFeng SHI ZhiCong GUO ZaiPing Smart energy Research Centre School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China institute for Superconducting and Electronic materials Australian Institute for Innovative MaterialsUniversity of WollongongInnovation CampusNorth WollongongNSW 2500Australia

The NiS;nanosheet array on Ni foil(NiS2/NF)was prepared using an in situ growth strategy and sulfidation method and was used as the cathode of lithium sulfur battery.The unique nanostructure of the NiS;nanosheet array can provide abundant active sites for the adsorption and chemical action of polysulfides.Compared with the sulfur powder coated pure NF(pure NF-S)for lithium sulfur battery,the sulfur powder coated NiS_(2)/NF(NiS_(2)/NF-S)electrode exhibits superior electrochemical performance.Specifically,the NiS_(2)/NF-S delivered a high reversible capacity of 1007.5 m Ah g^(-1) at a current density of 0.1 C(1 C=1675 mA g^(-1))and kept 74.5% of the initial capacity at 1.0 C after 200 cycles,indicating the great promise of NiS_(2)/NF-S as the cathode of lithium sulfur battery.In addition,the NiS_(2)/NF-S electrode also showed satisfactory electrochemical performance when used as the cathode for sodium sulfur battery.

关键词： nickel sulfides lithium sulfur battery sodium sulfur battery nanosheet array structure electrochemical performance

Multi-Scale Numerical Simulation of Flow,Heat and Mass Transfer Behaviors in Dense Gas-Solid Flows:A Brief Review

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Journal of Thermal Science 2022年第3期31卷 607-633页

作者： HE Yurong REN Anxing TANG Tianqi WANG Tianyu School of energy Science and Engineering Harbin Institute of TechnologyHarbin150001China Heilongjiang Key Laboratory of New energy Storage materials and Processes School of Energy Science and EngineeringHarbin Institute of TechnologyHarbin150001China

Dense gas-solid flows are very common in actual production and industrial fields,so it is significant to understand their hydrodynamic characteristics and heat and mass transfer behaviors.This article provides a brief review of multi-scale numerical simulation of flow,heat and mass transfer behaviors in dense gas-solid flows.It describes multiscale models(direct numerical simulation,discrete particle model,and two-fluid model)and the results of related research.Finally,it discusses possible future developments in research on the flow,heat and mass transfer characteristics of dense gas-solid two-phase flows.

关键词： gas-solid flows multi-scale modeling direct numerical simulation discrete particle model two-fluid model heat and mass transfer