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Mechanism of water-evaporation-induced electricity beyond streaming potential

Nano Research Energy 2024年第2期3卷 12-19页

作者： Sunmiao Fang Huan Lu weicun chu Wanlin Guo State Key Laboratory of Mechanics and Control of Mechanical Structures Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of EducationNanjing University of Aeronautics and AstronauticsNanjing 210016China College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Institute for Frontier Science Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Since its first discovery in 2017,evaporation-induced electricity has attracted extensive attention and shown significant advantages in green energy conversion.While the streaming potential-related electrokinetic effect has been intensively explored and widely recognized as the underlying mechanism,the role of coupling between water molecules and charge carriers in the material remains elusive.Here we show through carefully designed experiments that the streaming potential effect indeed plays a role but can only contribute about half to the total water-evaporation-induced voltage occurring within the partially-wetted region of the carbon black film where the solid-liquid-gas three-phase interface exists.It is also shown that water evaporation from carboxyl and amino-functionalized carbon black films produces opposite voltage signals.Detailed first-principles calculations unveil that the adsorption of water molecules can lead to reversed charge transfer in the carboxyl and amino-functionalized carbon substrates.Finally,an evaporation-driven charge transport mechanism is proposed for the induced electricity mediated by the coupling between water molecules and charge carriers in the material.The results reveal the important role of direct interaction between water molecules and materials,deepening our understanding of the mechanism for evaporation-induced hydrovoltaic effect beyond streaming potential.

关键词： evaporation-induced electricity streaming potential hydrovoltaic effect charge transfer

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Erratum to:Efficient and stable perovskite solar cells by build-inπ-columns and ionic interfaces in covalent organic frameworks

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Nano Research 2024年第5期17卷 4639-4640页

作者： Riming Nie Xiaokai Chen Zhongping Li weicun chu Si Ma Changqing Li Xiaoming Liu Yonghua Chen Zhuhua Zhang Wanlin Guo State Key Laboratory of Mechanics and Control of Mechanical Structures Key Laboratoryfor Itligent Nano Materials and Devices of the Ministry of EducationInstitute for Frontier ScienceNanjing University of Aeronautics and AstronauticsNarnjing 210016China Department of Chemical and Biomolecular Engineering Yonsei Universit50 Yonsei roSeodaemun-guSeoul 120749Republic of Korea College of Chemistry jilin UniversityChangchun 130012China Department of Energy and Chemical Engineering Ulsan National Instute of Science and Technology(UNIST)50 UNIST-gilEonyang-eupUju-gunUlsan 44919Republic of Korea Key Laboratory of Flexible Electronics(KLoFE) School of Flexible Electronics(Future Technologies)&Institute of Advanced Materials(IAM)Nanjing Tech University(Nanjing Tech)Nanjing 211816China

Erratum to Nano Research,2023,16(7):9387-9397 htps:/oi.or/0.100/1274-023-5603-040(1)One sentence in the article was unfortunately mispresented on page 9392.Instead of As shown in Fig.S19 in the ESM,the A2/A2 values of... 详细信息

关键词： COF columns perovskite

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Role of electrodes in study of hydrovoltaic effects

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Nano Research 2023年第8期16卷 11320-11325页

作者： chunxiao Zheng Sunmiao Fang weicun chu Jin Tan Bingkun Tian Xiaofeng Jiang Wanlin Guo Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing 210016China Institute for Frontier Science of Nanjing University of Aeronautics and Astronautics Nanjing 210016China

The last decade has witnessed the emergence of hydrovoltaic technology,which can harvest electricity from different forms of water movement,such as raindrops,waves,flows,moisture,and natural evaporation.In particular,the evaporation-induced hydrovoltaic effect received great attention since its discovery in 2017 due to its negative heat emission property.Nevertheless,the influence of electrode reactions in evaporation-induced power generation is not negligible due to the chemical reaction between active metal electrodes and water,which leads to“exceptional”power generation.Herein,we designed a series of experiments based on air-laid paper devices with electrodes of different activities as the top and bottom electrodes.To verify the contribution of electrodes,we compared the output performance of different electrode combinations when the device was partially-wetted and fully-wetted.The device hydrophilicity,salt concentration,and acidity or basicity of solutions were also comprehensively investigated.It is demonstrated that the chemical reaction of active metals(Zn,Cu,Ag,etc.)with different aqueous solutions can generate considerable electrical energy and significantly distort the device performance,especially for Zn electrodes with an output voltage from~1.26 to~1.52 V and current from~1.24 to~75.69μA.To promote the long-term development of hydrovoltaic technology,we recommend use of inert electrodes in hydrovoltaic studies,such as Au and Pt,especially in water and moisture environment.

关键词： hydrovoltaic effects electrodes water electrochemical reaction

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Integrating reduced graphene oxides and PPy nanoparticles for enhanced electricity from water evaporation

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International Journal of Smart and Nano Materials 2023年第2期14卷 230-242页

作者： Bingkun Tian Xiaofeng Jiang weicun chu chunxiao Zheng Wanlin Guo Zhuhua Zhang State Key Laboratory of Mechanics and Control for Aerospace Structures Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Educationand Institute for Frontier ScienceNanjing University of Aeronautics and AstronauticsNanjingChina

Developing high-performance nanostructured materials is key to deliver the potential of hydrovoltaic technology into practical applications.As single-component materials have approached its limit in generating hydrovoltaic electricity,the development of multi-component hydrovoltaic materials has been necessary in continuously boosting the electricity output.Here,we report a hydrovoltaic material by integrating reduced graphene oxides and polypyrrole nanoparticles(rGO/PPy),where the rGO contributes improved conductivity and large specific surface area while PPy nanoparticles enable enhanced interaction with water.The device fabricated with this material generates a short-circuit current of 6μA as well as a maximum power density of over 1μW/cm3 from natural evaporation of water.And the substantial ion-PPy interaction enables robust voltage generation from evaporation of various salt solutions.Moreover,an outstanding scaling ability is demonstrated by connecting 10 devices in series that generate a sustainable voltage of up to~2.5 V,sufficing to power many commercial devices,e.g.LED bulb and LCD screen.

关键词： Hydrovoltaic generator water evaporation reduced graphene oxide Ppy nanoparticles

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Materials for evaporation-driven hydrovoltaic technology

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Interdisciplinary Materials 2022年第4期1卷 449-470页

作者： chunxiao Zheng weicun chu Sunmiao Fang Jin Tan Xiaofan Wang Wanlin Guo Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjingChina Institute for Frontier Science Nanjing University of Aeronautics and AstronauticsNanjingChina

Water constitutes the largest energy carrier on earth,absorbing more than 70%of the solar energy received by the earth's surface,yet its low exploitation has been a constant concern.The hydrovoltaic effect is an emerging technology that generates electricity through the direct interaction between nanomaterials and water of various forms(raindrops,waves,flows,moisture,and natural evaporation).Especially,the evaporation-driven hydrovoltaic effect is a spontaneous and ubiquitous process that can directly convert thermal energy from the surrounding environment into electricity without the demand for additional mechanical work,which shows unique advantages compared with other hydrovoltaic effects.A variety of nanostructured materials have been steadily developed for evaporation-driven hydrovoltaic devices(EHDs)in recent years.However,there has been a lack of a clear specification on the selection and design of materials for improving device performance.Herein,we first analyze the mechanisms of EHDs followed by a summarization of the recent advances in materials,including carbon materials,biomass-based materials,metal oxides,composite materials,and others.We then discuss the strategies for improving the energy conversion efficiency and the output power in terms of structural design,surface modification,and interface treatment.Finally,we provide an outlook on the potential applications of electricity generation,sensors,and desalination technology,as well as the challenges and prospects for the development of this emerging technology in the future.

关键词： electric double layer hydrovoltaic effect materials synthesis structural optimization water evaporation

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Efficient and stable perovskite solar cells by build-inπ-columns and ionic interfaces in covalent organic frameworks

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Nano Research 2023年第7期16卷 9387-9397页

作者： Riming Nie Xiaokai Chen Zhongping Li weicun chu Si Ma Changqing Li Xiaoming Liu Yonghua Chen Zhuhua Zhang Wanlin Guo State Key Laboratory of Mechanics and Control of Mechanical Structures Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of EducationInstitute for Frontier ScienceNanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 120-749Republic of Korea College of Chemistry Jilin UniversityChangchun 130012China Department of Energy and Chemical Engineering Ulsan National Institute of Science and Technology(UNIST)50 UNIST-gilEonyang-eupUljugunUlsan 44919Republic of Korea Key Laboratory of Flexible Electronics(KLoFE) School of Flexible Electronics(Future Technologies)&Institute of Advanced Materials(IAM)Nanjing Tech University(Nanjing Tech)Nanjing 211816China

Perovskite solar cells(PSCs)have attracted much attention due to their rapidly increased power conversion efficiencies,however,their inherent poor long-term stability hinders their commercialization.The degradation of PSCs first comes from the degradation of hole transport materials(HTMs).Here,we report the construction of periodicπ-columnar arrays and ionic interfaces over the skeletons by introducing cationic covalent organic frameworks(C-COFs)to the HTM.Periodicπ-columnar arrays can optimize the charge transport ability and energy levels of the hole transport layer and suppress the degradation of HTM,and ionic interfaces over the skeletons can produce stronger electric dipole and electrostatic interactions,as well as higher charge densities.The C-COFs were designed and synthesized via Schiff base reaction by using 1,3,5-triformylphloroglucinol as a neutral knot and dimidium bromide as cationic linker.The neutral COFs(N-COFs)were also synthesized as a reference by using 3,8-diamino-6-phenylphenanthridine as neutral linker.PSCs with cationic COF exhibit the highest efficiency of 23.4%with excellent humidity and thermal stability.To the best of our knowledge,this is the highest efficiency among the meso-structured PSCs fabricated by a sequential process.

关键词： cationic covalent organic framework(C-COF) π-columnar arrays ionic interfaces charge density perovskite solar cells

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TDP-43 is a key molecule accelerating development of Alzheimer’s disease following traumatic brain injury

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Neural Regeneration Research 2024年第5期19卷 955-956页

作者： chu Chen Department of Cellular and Integrative Physiology Long School of MedicineUniversity of Texas Health Science Center at San AntonioSan AntonioTXUSA

Currently,more than 55 million people have dementia worldwide and Alzheimer’s disease(AD)is one of the most common causes of dementia in aging.However,no effective therapies are currently available for the prevention and treatment of AD.This is largely due to our limited understanding of the mechanisms underlying the neuropathogenesis of AD.It has widely been recognized that AD is heterogeneous and that multi-factors are contributing to the pathogenesis of AD.Accumulated evidence suggests that traumatic brain injury(TBI)is an important risk factor for the development of AD and dementia later in life(Guo et al.,2000;Johnson et al.,2010).However,the precise mechanism by which TBI contributes to developing AD has yet to be elucidated.

关键词： Alzheimer traumatic

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Motor cortical circuit adaptations in parkinsonism

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Neural Regeneration Research 2024年第10期19卷 2107-2108页

作者： Hong-Yuan chu Department of Neurodegenerative Science Van Andel Research InstituteGrand RapidsMIUSA Aligning Science Across Parkinson’s(ASAP)Collaborative Research Network

Parkinson's disease is a chronic and progressive neurodegenerative disorder characterized by the loss of dopaminergic neurons in the substantia nigra pars compacta,which leads to the featured motor impairment of parki... 详细信息

关键词： parkin impairment rigidity

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Aberrant protamination in sperm correlates to anomalous nuclear and cytoplasmic architectures in infertile males with sperm dysmorphology

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Asian Journal of Andrology 2024年第2期26卷 183-188页

作者： Huan Jiang chu-Jie Huang Department of Reproductive Endocrinology Longgang District Maternity&Child Healthcare Hospital of Shenzhen City(Longgang Maternity and Child Institute of Shantou University Medical College)Shenzhen 518172China Institute of Reproductive Immunology College of Life Science and TechnologyJinan UniversityGuangzhou 510632China

Aberrant sperm protamination is linked to sperm dysmorphology and nuclear chromatin condensation.Yet,its effects on sperm cytoplasmic maturation remain largely unexplored.The relationships of protamines,sperm morphology,DNA damage,and cytoplasmic remodeling were illustrated in this study to provide fresh perspectives on the mechanisms of male infertility.A total of 205 infertile males were allocated into 5 groups according to the percentage of spermatozoa exhibiting abnormal morphology within their samples.Sperm concentration,motility,abnormal sperm morphology,cytoplasmic droplets(CDs),and excess residual cytoplasm(ERC)were analyzed according to the World Health Organization manual(2010).Sperm nuclear vacuoles(NVs)were determined by propidium iodide(PI)staining.Sperm protamine expressions(P1 and P2)were detected by western blot.DNA damage was measured by acridine orange test(AOT)to calculate the proportion of sperm with single-strand DNA breaks(SSBs).Our data showed that sperm concentration and motility in infertile males significantly decreased with the severity of abnormal sperm morphology(both P<0.01).P1 level,P1/P2 ratio,and SSB rate increased with the severity of sperm dysmorphology,whilst the P2 level decreased(all P

关键词： abnormal sperm morphology excess residual cytoplasm male infertility protamines sperm DNA damage sperm nuclear vacuoles

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A Fully-Integrated Memristor Chip for Edge Learning

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Nano-Micro Letters 2024年第9期16卷 123-127页

作者： Yanhong Zhang Liang chu Wenjun Li School of Elecronics and Information Hangzhou Dianzi UniversityHangzhou 310018People’s Republic of China

It is still challenging to fully integrate computing in memory chip as edge learning devices.In recent work published on Science,a fully-integrated chip based on neuromorphic memristors was developed for edge learning as artificial neural networks with functionality of synapses,dendrites,and somas.A crossbar-array memristor chip facilitated edge learning including hardware realization,learning algorithm,and cycle-parallel sign-and threshold-based learning(STELLAR)scheme.The motion control and demonstration platforms were executed to improve the edge learning ability for adapting to new scenarios.

关键词： Computing in memory Edge learning Fully-integrated chip

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