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Aqueous Supercapacitors on Conductive Cotton

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Nano Research 2010年第6期3卷 452-458页

作者： Mauro Pasta Fabio La Mantia liangbing hu Heather Dawn Deshazer Yi Cui Dipartimento di Chimica Inorganica Metallorganica e Analitica“Lamberto Malatesta”Universitàdegli Studi di MilanoVia Venezian 2120133 MilanoItaly Department of Materials Science and Engineering Stanford UniversityStanfordCA 94305USA

Wearable electronics offer the combined advantages of both electronics and fabrics.In this article,we report the fabrication of wearable supercapacitors using cotton fabric as an essential component.Carbon nanotubes are conformally coated onto the cotton fibers,leading to a highly electrically conductive interconnecting network.The porous carbon nanotube coating functions as both active material and current collector in the supercapacitor.Aqueous lithium sulfate is used as the electrolyte in the devices,because it presents no safety concerns for human use.The supercapacitor shows high specific capacitance(~70-80 F·g^(-1) at 0.1 A·g^(-1))and cycling stability(negligible decay after 35,000 cycles).The extremely simple design and fabrication process make it applicable for providing power in practical electronic devices.

关键词： Supercapacitor wearable electronics energy storage carbon nanotubes

Garnet/polymer hybrid ion-conducting protective layer for stable lithium metal anode

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Nano Research 2017年第12期10卷 4256-4265页

作者： Chunpeng Yang Boyang Liu Feng Jiang Ying Zhang hua Xie Emily Hitz liangbing hu Department of Materials Science and Engineering University of Maryland College Park Maryland 20742 USA

Rechargeable Li metal batteries using Li metal anodes have attracted worldwide interest because of their high energy density. The critical barriers limiting their commercial application include uncontrolled dendritic Li growth and the unstable Li-electrolyte interface. Considerable efforts have been directed towards solving these problems, e.g., modifying the electrolyte, creating artificial interfacial layers for the Li metal, and constructing three-dimensional structures for the Li metal. However, stabilizing the Li metal interface remains challenging because of the highly reactive nature of the Li metal. In this study, we utilize a Li-ion conducting hybrid film comprising a garnet-type ion conductor and a poly（ethylene oxide）-based polymer electrolyte as a protective layer to stabilize the Li-electrolyte interface and mitigate the growth of Li dendrites. The hybrid ion-conducting layer can block Li dendrites from proliferating and accommodate Li volume expansion because of its robust mechanical properties. Moreover, the ion-conducting layer allows Li deposition only underneath it, rather than on the surface, functioning as a permanent protective layer to ensure the stability of the Li metal over a long cycling life. The dendrite-inhibiting effect of the ion-conducting protective layer is visually evidenced by in situ microscopy using planar batteries. The protective Li metal anode exhibits excellent cycling stability and low voltage hysteresis （-15 mV at 0.2 mA-cm-2） for a cycle life as long as 1,000 h. It also shows a high Coulombic efficiency （-99.5%） in a full cell against a LiFePO4 cathode, exhibiting promise for application in Li metal batteries. Our results imply that the ion-conducting protective layer markedly improves the metal anode, yielding safe, long-life, and high-energy-density batteries.

关键词： Li metal battery,Li dendrites,garnet solid-state electrolyte,interface protection,ion-conductingmembrane

Electrochemical measurement of serotonin by Au-CNT electrodes fabricated on microporous cell culture membranes

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Microsystems & Nanoengineering 2020年第1期6卷 494-506页

作者： Ashley A.Chapin Pradeep R.Rajasekaran David N.Quan liangbing hu Jens Herberholz William E.Bentley Reza Ghodssi Fischell Department of Bioengineering College ParkMD 20742USA Institute for Systems Research College ParkMD 20740USA Department of Materials Science and Engineering College ParkMD 20740USA Department of Psychology and Neuroscience and Cognitive Science Program College ParkMD 20740USA Institute for Bioscience and Biotechnology Research RockvilleMD 20850USA Robert E.Fischell Institute for Biomedical Devices RockvilleMD 20850USA Department of Electrical and Computer Engineering College ParkMD 20742USA

Gut–brain axis(GBA)communication relies on serotonin(5-HT)signaling between the gut epithelium and the peripheral nervous system,where 5-HT release patterns from the basolateral(i.e.,bottom)side of the epithelium activate nerve afferents.There have been few quantitative studies of this gut-neuron signaling due to a lack of real-time measurement tools that can access the basolateral gut epithelium.In vitro platforms allow quantitative studies of cultured gut tissue,but they mainly employ offline and endpoint assays that cannot resolve dynamic molecular-release patterns.Here,we present the modification of a microporous cell culture membrane with carbon nanotube-coated gold(Au-CNT)electrodes capable of continuous,label-free,and direct detection of 5-HT at physiological concentrations.Electrochemical characterization of single-walled carbon nanotube(SWCNT)-coated Au electrodes shows increased electroactive surface area,5-HT specificity,sensitivity,and saturation time,which are correlated with the CNT film drop-cast volume.Two microliters of CNT films,with a 10-min saturation time,0.6μA/μM 5-HT sensitivity,and reliable detection within a linear range of 500 nM–10μM 5-HT,can be targeted for high-concentration,high-time-resolution 5-HT monitoring.CNT films(12.5μL)with a 2-h saturation time,4.5μA/μM 5-HT sensitivity,and quantitative detection in the linear range of 100 nM–1μM can target low concentrations with low time resolution.These electrodes achieved continuous detection of dynamic diffusion across the porous membrane,mimicking basolateral 5-HT release from cells,and detection of cell-released 5-HT from separately cultured RIN14B cell supernatant.Electrode-integrated cell culture systems such as this can improve in vitro molecular detection mechanisms and aid in quantitative GBA signaling studies.

关键词： release saturation dynamic

Designing Textile Architectures for High Energy-Efficiency human Body Sweat-and Cooling-Management

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Advanced Fiber Materials 2019年第1期1卷 61-70页

作者： Kun Fu Zhi Yang Yong Pei Yongxin Wang Beibei Xu Yuhuang Wang Bao Yang liangbing hu Department of Materials Science and Engineering University of MarylandCollege ParkMD 20742USA Department of Mechanical Engineering University of DelawareNewarkDE 19716USA Department of Mechanical Engineering University of MarylandCollege ParkMD 20742USA Department of Chemistry University of MarylandCollege ParkMD 20742USA

Thermal management of textiles requires local microclimate control over heat and wet dissipation to create a comfortable thermal-wet environment at the interface of the human body and clothing.Herein,we design a fabric capable of both sweat-and cooling-management using a knitted fabric featuring a bilayer structure consisting of hydrophobic polyethylene terephthalate and hydrophilic cellulose fibers to simultaneously achieve high infrared(IR)transmittance and good thermal-wet comfort.The IR transmission of this cooling textile increased by~twofold in the dry state and~eightfold in the wet state compared to conventional cotton fabric.When the porosity changes from 10 to 47%with the comparison of conventional cotton fabric and our cooling textile,the heat flux is increased from 74.4 to 152.3 W/cm^(2).The cooling effect of the cooling fabric is 105%greater than that of commercial cotton fabric,which displays a better thermal management capacity for personal cooling.This bilayer design controls fast moisture transfer from inside out and provides thermal management,demonstrating high impact not only for garments,but also for other systems requiring heat regulation,such as buildings,which could mitigate energy demand and ultimately contribute to the relief of global energy and climate issues.

关键词： Thermal responsive textile IR transmission Cooling textiles Moisture transfer and management

Scalable nanomanufacturing of surfactant-free carbon nanotube inks for spray coatings with high conductivity

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Nano Research 2015年第7期8卷 2242-2250页

作者： Colin Preston Da Song Jaiqi Dai Zois Tsinas John Bavier John Cumings Vince Ballarotto liangbing hu Department of Materials Science and Engineering University of Maryland College Park College Park Maryland 20742 USA Department of Bioengineering University of Maryland College Park College Park Maryland 20742 USA Laboratory for Physical Sciences 8050 Greenmead Drive College Park Maryland 20740 USA

Spray-coated carbon nanotube films offer a simple and printable solution for fabricating low cost, lightweight, and flexible thin-film electronics. However, current nanotube spray inks require either a disruptive surfactant or destructive surface functionalization to stabilize dispersions at the cost of the electrical properties of the deposited film. We demonstrate that high-purity few-walled carbon nanotubes may be stabilized in isopropanol after surface functionalization and that optimizing the ink stability dramatically enhances the conductivity of subsequent spray-coated thin films. We consequently report a surfactant-free carbon nanotube ink for spray-coated thin films with conductivities reaching 2,100 S/cm. Zeta-potential measurements, used to quantify the nanotube ink dispersion quality, directly demonstrate a positive correlation with the spray- coated film conductivity, which is the key metric for high-performance printed electronics.

关键词： carbon nanotubes, surfactant-free ink spray coaing, high conductivity, zeta potential

In Situ Wood Delignification toward Sustainable Applications

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Accounts of Materials Research 2021年第8期2卷 606-620页

作者： Jianguo Li Chaoji Chen J.Y.Zhu Arthur J.Ragauskas liangbing hu Department of Materials Science and Engineering University of MarylandCollege ParkMaryland 20742United States Forest Products Laboratory USDA Forest ServiceMadisonWisconsin 53726United States Department of Chemical and Biomolecular Engineering and Department of Chemical and Biomolecular Engineering and Center for Renewable Carbon Department of ForestryWildlifeand FisheriesUniversity of Tennessee Institute of AgricultureUniversity of TennesseeKnoxvilleTennessee 37996United States BioEnergy Science Center&Center for Bioenergy Innovation Biosciences DivisionUniversity of Tennessee-Oak Ridge National Laboratory Joint Institute for Biological ScienceOak Ridge National LaboratoryOak RidgeTennessee 37831United States Center for Materials Innovation University of MarylandCollege ParkMaryland 20742United States

CONSPECTUS:As one of the most abundant and versatile natural materials on Earth,recently wood has attracted tremendous attention from scientists and engineers due to its outstanding advantages,including hierarchically porous microstructure,high mechanical strength,environmental friendliness,renewability,and biodegradability.Wood’s hierarchically porous structure and chemical components(e.g.,cellulose,hemicelluloses,and lignin)enable its mechanical,ionic,optical,and thermal properties to be tuned via physical,chemical,and/or thermal modifications.Among these various approaches,the chemical delignification of bulk wood is the most fascinating,in which the majority of lignin and hemicelluloses is removed while leaving the cellulose intact,maintaining wood’s physical integrity and hierarchical structure.This delignified structure is unique,composed of hollow,aligned channels made up of cellulose microfibrils,and particularly attractive given its origin from a sustainable and renewable resource.As a result,delignified wood has attracted increasing attention for applications that go far beyond traditional wood utilization,such as lightweight yet strong structural materials,energy storage and conversion,environmental remediation,flexible electronics,and bioengineering.This Account reviews recent developments in bulk wood delignification strategies toward the achievement of such advanced wood technologies for sustainable applications,with a focus on the research in our group.Similar to chemical pulping and bleaching,wood delignification involves a series of nucleophilic reactions based on alkaline Na2SO3 or Na2S systems(i.e.,chemical pulping)or electrophilic,radical,and oxidation reactions based on H2O2,ClO2,or NaClO systems(i.e.,chemical bleaching)to deconstruct,fragment,and promote the hydrophilicity of lignin macromolecules,which finally make lignin easier to be removed.We discuss the structure and properties of partially and near-completely delignified wood,with a focus on process-structure−property relationships.The

关键词： removed attractive versatile

A carbon-based 3D current collector with surface protection for Li metal anode

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Nano Research 2017年第4期10卷 1356-1365页

作者： Ying Zhang Boyang Liu Emily Hitz Wei Luo Yonggang Yao Yiju Li diaqi Dai Chaoji Chen Yanbin Wang Chunpeng Yang Hongbian Li liangbing hu Department of Materials Science and Engineering University of Maryland College Park MD 20742 USA National Center for Nanoscience and Technology Beijing 100190 China

Lithium metal is considered the ideal anode material for Li-ion-based batteries because it exhibits the highest specific capacity and lowest redox potential for this type of cells. However, growth of Li dendrites, unstable solid electrolyte interphases, low Coulombic efficiencies, and safety hazards have significantly hindered the practical application of metallic Li anodes. Herein, we propose a three-dimensional （3D） carbon nanotube sponge （CNTS） as a Li deposition host. The high specific surface area of the CNTS enables homogenous charge distribution for Li nucleation and minimizes the effective current density to overcome dendrite growth. An additional conformal A1203 layer on the CNTS coated by atomic layer deposition （ALD） robustly protects the Li metal electrode/electrolyte interface due to the good chemical stability and high mechanical strength of the layer. The Li@ALD-CNTS electrode exhibits stable voltage profiles with a small overpotential ranging from 16 to 30 mV over 100 h of cycling at 1.0 mA·cm^-2. Moreover, the electrodes display a dendrite-free morphology after cycling and a Coulombic efficiency of 92.4% over 80 cycles at 1.0 mA·cm^-2 in an organic carbonate electrolyte, thus demonstrating electrochemical stability superior to that of planar current collectors. Our results provide an important strategy for the rational design of current collectors to obtain stable Li metal anodes.

关键词： lithium metal anode Coulombic efficiency current collector carbon nanotube interfacial protection stable cycling

Strong and Superhydrophobic Wood with Aligned Cellulose Nanofibers as a Waterproof Structural Material

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Chinese Journal of Chemistry 2020年第8期38卷 823-829页

作者： Yongfeng Li Chaoji Chen Jianwei Song Chunpeng Yang Yudi Kuang Azhar Vellore Emily Hitz Mingwei Zhu Feng Jiang Yonggang Yao Amy Gong Ashlie Martini liangbing hu Department of Materials Science and Engineering University of MarylandCollege ParkMaryland20742USA Mechanical Engineering University of CaliforniaMercedCalifornia95343USA

Lightweight structural materials are important for the energy efficiency of applications,particularly those in the building sector.Here,inspired by nature,we developed a strong,superhydrophobic,yet lightweight material by simple in situ growth of nano-SiO2 and subsequent densification of the wood substrate.In situ generation of SiO2 nanoparticles both inside the wood channels and on the wood surfaces gives the material superhydrophobicity,with static and dynamic contact angles of 159.4°and 3°,respectively.Densification of the wood to remove most of the spaces among the lumen and cell walls results in a laminated,dense structure,with aligned cellulose nanofibers,which in turn contributes to a high mechanical strength up to 384.2 MPa(7-times higher than natural wood).Such treatment enables the strong and superhydrophobic wood(SH-Wood)to be stable and have excellent water,acid,and alkaline resistance.The high mechanical strength of SH-Wood combined with its excellent structural stability in harsh environments,as well its low density,positions the strong and superhydrophobic wood as a promising candidate for strong,lightweight,and durable structural materials that could potentially replace steel.

关键词： fibers proof structural

Alanine aminotransferase(OsAlaAT1)modulates nitrogen utilization,grain yield,and quality in rice

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Journal of Genetics and Genomics 2022年第5期49卷 510-513页

作者： liangbing Fang Liuyang Ma Shaolu Zhao Ruijie Cao Guiai Jiao Peisong hu Xiangjin Wei State Key Laboratory of Rice Biology China National Center for Rice ImprovementChina National Rice Research InstituteHangzhouZhejiang 310006China

Widespread use of inorganic nitrogen fertilizers has increased yields of many grains, including rice (Oryza sativa L.);however, fertilizers are costly for farmers and cause serious environmental problems, such as soil acidification and water eutrophication (Guo et al., 2010, 2021;Liu et al., 2021). Improving nitrogen use efficiency(NUE) in rice offers a practical way to enhance grain yield and alleviate the environmental problems caused by overuse of nitrogen fertilizer. Identifying and characterizing genes involved in NUE provides crucial information for this aim.

关键词： soil grain fertilizers