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2.4 V ultrahigh-voltage aqueous MXene-based asymmetric micro-supercapacitors with high volumetric energy density toward a self-sufficient integrated microsystem

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Fundamental Research 2024年第2期4卷 307-314页

作者： yuanyuan zhu Shuanghao Zheng Jieqiong Qin Jiaxin Ma Pratteek Das Feng Zhou Zhong-Shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Shijingshan DistrictBeijing 100049China College of Science Henan Agricultural UniversityZhengzhou 450002China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China

Two-dimensional MXenes are key high-capacitance electrode materials for micro-supercapacitors(MSCs)catering to integrated microsystems.However,the narrow electrochemical voltage windows of conventional aqueous electrolytes(≤1.23 V)and symmetric MXene MSCs(typically≤0.6 V)substantially limit their output voltage and energy density.Highly concentrated aqueous electrolytes exhibit lower water molecule activity,which inhibits water splitting and consequently widens the operating voltage window.Herein,we report ultrahigh-voltage aqueous planar asymmetric MSCs(AMSCs)based on a highly concentrated LiCl-gel quasi-solid-state electrolyte with MXene(Ti3C2Tx)as the negative electrode and MnO_(2) nanosheets as the positive electrode(MXene//MnO_(2)-AMSCs).The MXene//MnO_(2)-AMSCs exhibit a high voltage of up to 2.4 V,attaining an ultrahigh volumetric energy density of 53 mWh cm−3.Furthermore,the in-plane geometry and the quasi-solid-state electrolyte enabled excellent mechanical flexibility and performance uniformity in the serially/parallel connected packs of our AMSCs.Notably,the MXene//MnO_(2)-AMSC-based integrated microsystem,in conjunction with solar cells and consumer electronics,could efficiently realize simultaneous energy harvesting,storage,and conversion.The findings of this study provide insights for constructing high-voltage aqueous MXene-based AMSCs as safe and self-sufficient micropower sources in smart integrated microsystems.

关键词： Asymmetric micro-supercapacitors MXene MnO_(2) Aqueous electrolyte High voltage Integrated microsystem

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Carbon Emission Effects Driven by Evolution of Chinese Dietary Structure from 1987 to 2020

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Chinese Geographical Science 2024年第1期34卷 181-194页

作者： zhu yuanyuan ZHANG Yan zhu Xiaohua Key Laboratory of Geographic Process Analysis&Simulation Hubei Province Central China Normal UniversityWuhan430079China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing100101China

Exploring carbon emission effects based on the evolution of residents’ dietary structure to achieve the carbon neutrality goal and mitigate climate change is an important task.This study took China as the research object(data excluding Hong Kong,Macao and Taiwan) and used the carbon emission coefficient method to quantitatively measure the food carbon emissions from 1987–2020,then analyzed the carbon emission effects under the evolution of dietary structure.The results showed that during the study period,the Chinese dietary structure gradually changed to a high-carbon consumption pattern.The dietary structure of urban residents developed to a balanced one,while that of rural residents developed to a high-quality one.During the study period,the per capita food carbon emissions and total food consumption of Chinese showed an increasing trend.The per capita food carbon emissions of residents in urban and rural showed an overall upward trend.The total food carbon emissions in urban increased significantly,while that in rural increased first and then decreased.The influence of beef and mutton on carbon emissions is the highest in dietary structure.Compared with the balanced dietary pattern,the food carbon emissions of Chinese residents had not yet reached the peak,but were evolving to a high-carbon consumption pattern.

关键词： dietary structure structural evolution carbon emission effects carbon neutrality China

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Heat Storage Performance of PCM in a Novel Vertical Pointer-Shaped Finned Latent Heat Tank

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Journal of Thermal Science 2024年第2期33卷 422-434页

作者： MAO Qianjun zhu yuanyuan LI Tao School of Urban Construction Wuhan University of Science and TechnologyWuhan430065China

The heat storage performance of latent heat storage systems is not good due to the poor thermal conductivity of phase change materials.In this paper,a new type of pointer-shaped fins combining rectangular and triangular fins has been employed to numerically simulate the melting process in the heat storage tank,and the fin geometry parameter effects on heat storage performance have been studied.The results indicate that compared with the bare tube and the rectangular finned tank,the melting time of the phase change material in the pointer-shaped finned tank is reduced by 64.2%and 15.1%,respectively.The closer the tip of the triangular fin is to the hot wall,the better the heat transfer efficiency.The optimal height of the triangular fin is about 8 mm.Increasing the number of fins from 4 to 6 and from 6 to 8 reduces the melting time by 16.0%and 16.7%respectively.However,increasing the number of fins from 8 to 10 only reduces the melting time by 8.4%.When the fin dimensionless length is increased from 0.3 to 0.5 and from 0.5 to 0.7,the melting time is shortened by 17.5%and 13.0%.But the melting time is only reduced by 2.9%when the dimensionless fin length is increased from 0.7 to 0.9.For optimising the design of the thermal storage system,the results can provide a reference value.

关键词： thermal energy storage phase change material pointer-shaped fins heat storage performance

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Advancing MXene-based integrated microsystems with microsupercapacitors and/or sensors:Rational design,key progress,and challenging perspectives

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Journal of Materiomics 2023年第6期9卷 1242-1262页

作者： Jin Jia yuanyuan zhu Pratteek Das Jiaxin Ma Sen Wang Guang zhu Zhong-Shuai Wu Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Shijingshan DistrictBeijing 100049China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China

The escalating demand for micro/nano-sized devices,such as micro/nano-robots,intelligent portable/wearable microsystems,and implantable medical microdevices,necessitates the expeditious development of integrated microsystems incorporating energy conversion,storage,and consumption.Critical bottlenecks in microscale energy storage/sensors and their integrated systems are being addressed by exploring new technologies and new materials,e.g.,MXene,holding great potential for developing lightweight and deformable integrated microdevices.This review summarizes the latest progress and milestones in the realization of MXene-based micro-supercapacitors(MSCs)and sensor arrays,and thus discusses the design fundamentals and key advancements of MXene-based energy conversion-storageconsumption integrated microsystems.Finally,we outline the key challenges in fabricating MXenebased MSCs/sensors and their self-powered integrated microsystems,which is crucial for their practical applications.Particularly,we illuminate viable solutions to such unsolved issues and highlight the exciting opportunities.

关键词： MXene Micro-supercapacitors Sensors Self-powered Integrated microsystem

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A novel pathway and seeded polymerizations of aggregates at the thermodynamic state for an amido-anthraquinone compound

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Organic Chemistry Frontiers 2022年第5期9卷 1254-1260页

作者： Houchen Wang Mingyue Chen yuanyuan zhu Yu Li Han Zhang Tiesheng Shi College of Chemistry Chemical Engineering and Materials ScienceZaozhuang UniversityZaozhuang 277160China

Monomers undergo supramolecular polymerizations via diverse pathways conferring pathway complexity;deciphering the complexity has been an intriguing and fundamental subject of various studies.

关键词： polymerization thermodynamic complexity

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Kinetic regulation of MXene with water-in-LiCl electrolyte for high-voltage micro-supercapacitors

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National Science Review 2022年第7期9卷 97-105页

作者： yuanyuan zhu Shuanghao Zheng Pengfei Lu Jiaxin Ma Pratteek Das Feng Su Hui-Ming Cheng Zhong-Shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian National Laboratory for Clean Energy Chinese Academy of Sciences University of Chinese Academy of Sciences Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences Shenzhen International Graduate School Tsinghua University

MXenes are one of the key materials for micro-super capacitors(MSCs),integrating miniaturized energy-storage components with microelectronics.However,the energy densities of MSCs are greatly hampered by MXenes’ narrow working potential window(typically≤0.6 V) in aqueous ele ctrolytes.Here,we report the fabrication of high-voltage MXene-MSCs through the efficient regulation of reaction kinetics in 2 D Ti3C2TxMXene microelectrodes using a water-in-LiCl(WIL,20 m LiCl) salt gel electrolyte.Importantly,the intrinsic energy-storage mechanism of MXene microelectrodes in WIL,which is totally different from traditional electrolytes(1 m LiCl),was revealed through in situ and ex situ characterizations.We validated that the suppression of MXene oxidation at high anodic potential occurred due to the high content of WIL regulating anion intercalation in MXene electrodes,which effectively broadened the voltage window of MXene-MSCs.Remarkably,the symmetric planar MXene-MSCs presented a record operating voltage of 1.6 V,resulting in an exceptionally high volumetric energy density of 31.7 mWh cm-3.With the ultra-high ionic conductivity(69.5 mS cm-1) and ultralow freezing point(-57℃) of the WIL gel electrolyte, our MSCs could be operated in a wide temperature range of-40 to 60℃,and worked for a long duration even at-40℃,demonstrative of its practicality in extreme environments.

关键词： MXene micro-supercapacitors water-in-LiCl aqueous high voltage wide temperature

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The potential of engineered multifunctional quantum dots for macrophage theranostics

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The Innovation 2023年第5期4卷 9-10页

作者： Chengliang Yin yuanyuan zhu Yufei Lv Hongping Deng Bing Liu Faculty of Medicine Macao University of Science and TechnologyMacao 999078China Department of Pathology Harbin Medical UniversityNangang DistrictHarbin 150001China Postdoctoral Mobile Station of Basic Medical Sciences Hengyang MedicalSchoolDepartment of OphthalmologyThe First Ailiateda Hospitalof University of SouthChinaUniversity of South ChinaHengyang 421001China Shanghai Frontiers Science Center of TCM Chemical Biology Instute of Interdisciplinary Integrative Medicine ResearchShanghai University of Taditional Chinese MedicineShanghai 201203China Department of Oral and Maillofacial Surgery The First Aflited Hospital of Harbin Medical UniversityHarbin 150001China NHC Key Laboratory of Cell Transplantation The First Afliated Hospital of Habin Medical UniversityHarbin 150001China

Macrophages play important roles in tissue repair,inflammation,and the progression of various diseases.Imaging and tracking macrophage cells in vitro and in vivo can reveal the location and movement of macrophages in tissues and animals,which is critical to understanding macrophage functions in different diseases.1 Macrophages can generally be divided into the following two phenotypes based on their physiological functions:proinflammatory M1 macrophages and alternatively activated M2 macrophages,both of which are closely related to the development and progression of various diseases.A promising methodology for disease therapy is the modulation of macrophage phenotypes,which can reverse disease states and metabolic processes.Therefore,engineering nanoparticles that combine the advantages of imaging and therapy may offer novel strategies for macrophage theranostics.

关键词： macrophage inflammation potential

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中国乡村社会空间重构过程再认知及展望——基于人口城乡逆流视角

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地理科学进展 2024年第2期43卷 374-386页

作者：朱媛媛罗源华中师范大学地理过程分析与模拟湖北省重点实验室武汉430079 湖北省发展和改革委员会/华中师范大学武汉城市圈研究院武汉430079

城乡人口流动是改变并形成新城乡关系的重要驱动力。伴随中国城乡融合的深度发展,中国城乡人口流动出现新动向,即人口城乡逆流,这一重要社会现象正推动着乡村社会联系与发展。人业互动作用下作为空间载体的乡村社会空间的演进与重构呈... 详细信息

城乡人口流动是改变并形成新城乡关系的重要驱动力。伴随中国城乡融合的深度发展,中国城乡人口流动出现新动向,即人口城乡逆流,这一重要社会现象正推动着乡村社会联系与发展。人业互动作用下作为空间载体的乡村社会空间的演进与重构呈现出新的时代特征,探讨中国乡村“人—地—业”格局复杂化背景下的人口城乡逆流对乡村社会空间的重构过程,对于理解目前“城乡中国”面临的困境与机遇具有重要的理论和现实意义。论文从城乡人口流动与乡村重构、乡村产业发展与乡村社会空间演变、乡村社会空间重构过程及效应等核心研究领域着手,利用VOSviewer工具对国内外相关文献进行梳理,凝练出当前研究重点关注主题取得的成效与亟需解决的瓶颈,进而从人口城乡逆流重构乡村社会空间的理论分析框架、过程规律、作用机理、地方效应等4个方向进行研究展望,旨在重新认知并诠释新时代中国人口城乡逆流现象,破解城乡融合深度发展的人口问题,为缩小城乡发展不平衡、实现城乡共同繁荣提供科学理论依据和支撑。

关键词：人口城乡逆流乡村产业发展乡村空间重构乡村社会空间

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Continuous SiC skeleton reinforced highly oriented graphite flake composites with high strength and specific thermal conductivity

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Journal of Advanced Ceramics 2022年第3期11卷 403-413页

作者： Xiaoyu ZHANG Wenqi XIE Lan SUN Zhilei WEI Zhejian ZHANG yuanyuan zhu Jiabin HU Shenghe WANG Zhongqi SHI State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China State Grid Anhui Electric Power Co. Ltd.Hefei230061China

Highly oriented graphite-based composites have attracted great attention because of their high thermal conductivity(TC),but the low mechanical properties caused by the inhomogeneous distribution and discontinuity of reinforcements restrict the wide applications.Herein,continuous SiC ceramic skeleton reinforced highly oriented graphite flake(SiC/GF)composites were successfully prepared by combining vacuum filtration and spark plasma sintering.The effect of SiC concentration on the microstructure,flexural strength,and thermophysical properties of the composites was investigated.The GF grains in the composites exhibited high orientation with a Lotgering factor of>88%when the SiC concentration was≤30 wt%,and the SiC skeleton became continuous with the SiC concentration reaching 20 wt%.The formation of continuous SiC skeleton improved the flexural strength of the composites effectively while keeping the TC in a high level.Especially,the composites with 30 wt%SiC exhibited the flexural strength up to 105 MPa,and the specific TC reaching 0.118 W·m^(2)·K^(−1)·kg-1.The composites with excellent flexural strength and thermophysical properties showed significant promise for thermal management applications.

关键词： ceramics composite materials high orientation flexural strength heat conduction

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学校变革中的教师知识景观变构

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全球教育展望 2024年第4期53卷 105-117页

作者：朱园园华东师范大学马克思主义学院上海200241

教师是教育改革成功与否的关键力量,这是基本共识。当教育改革不成功时,人们多从教师职业信念、专业素养或是教育生态等方面进行简单归因,但这些思路忽视了教师与其所处环境之间相互建构的复杂关系。本研究以月城初中为例,运用“教师知... 详细信息

教师是教育改革成功与否的关键力量,这是基本共识。当教育改革不成功时,人们多从教师职业信念、专业素养或是教育生态等方面进行简单归因,但这些思路忽视了教师与其所处环境之间相互建构的复杂关系。本研究以月城初中为例,运用“教师知识景观”概念探究并揭示这一复杂图景。教师知识景观是描述教师知识与其所处社会文化背景间复杂关系的隐喻性概念。教师知识景观变构是变革情境中教师知识内在转变及其新质生成的结果,涉及多层面与因素所发生的动态性和根本性变化。研究发现,学校转型变革中,教师知识景观发生了多层次的变构,包括生态层面的整体转变,变革、身份和专业等知识层面的内在转化,以及关乎个体生命成长的意义实现。深入剖析教师知识景观变构的内在机制,“价值—制度—行动”等外部联动性因素提供持续而稳定的环境中介;教师对内在发展、自我生命价值实现的需求与意义确认,是促使教师知识景观深度变构的内部决定性因素。由此,我们需要深层透视教师知识景观中的关键主体角色,以激发深层变构力;理性处理张力关系,以促进教师深度自省;建构多元教师知识社群,以形成共生式叙事。

关键词：学校变革教师知识教师知识景观变构 “生命·实践”教育学

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