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3D aerogels from hybrid 2D materials:ultralight and flexible superinsulators

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National Science Review 2023年第10期10卷 8-9页

作者： Stefano Ippolito yury gogotsi A.J.Drexel Nanomaterials Institute and Department of Materials Science & Engineering Drexel University

Advances in research and technology to boost human space exploration proceed at a brisk pace,although a major obstacle remains:the cold and empty outer space.Can we capitalize on the unique properties of specific materials and structures to address this problem?Considered among the best insulating materials available,aerogels have become prime candidates in this field owing to their ultralight weight,large surface area,

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Two-dimensional MXenes and their applications

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Frontiers of physics 2023年第1期18卷 1-5页

作者： Guangcun Shan Zejian Ding yury gogotsi School of Instrumentation Science and Opto-electronics Engineering Beihang UniversityBeijing 100091China Institute of Experimental Physics Saarland University66123 SaarbrückenGermany A.J.Drexel Nanomaterials Institute and Department of Materials Science and EngineeringDrexel UniversityPhiladelphiaPA 19104USA

Two-dimensional(2D)transition metal carbides,nitrides or carbonitrides(MXene)have attracted tremendous attention as a potentially the largest family of inorganic materials.They have a general formula Mn+1XnTx,where M is an early transition metal(2 or more can be present in a random mix or a specific order),X is C and/or N elements(oxygen can partially substitute),and T_(x)(x is variable)represent surface terminations,which can include reactive end groups(such as–OH and=O),halogens and chalcogens,and n can vary from 1 to 4(fractions are possible).All MXenes can either be produced as multilayer particles(ml-MXene)or delaminated(d-MXene)single-layer flakes.

关键词： materials. carbonitride dimensional

Free-Standing α-MoO_(3)/Ti_(3)C_(2) MXene Hybrid Electrode in Water-in-Salt Electrolytes

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Energy & Environmental Materials 2023年第4期6卷 6-14页

作者： Mohit Saraf Christopher E.Shuck Nazgol Norouzi Kyle Matthews Alex Inman Teng Zhang Ekaterina Pomerantseva yury gogotsi A.J.Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel UniversityPhiladelphia PA 19104USA

While transition-metal oxides such as α-MoO_(3)provide high capacity,their use is limited by modest electronic conductivity and electrochemical instability in aqueous electrolytes.Two-dimensional(2D)MXenes,offer metallic conductivity,but their capacitance is limited in aqueous electrolytes.Insertion of partially solvated cations into Ti_(3)C_(2)MXene from lithium-based water-in-salt(WIS)electrolytes enables charge storage at positive potentials,allowing a wider potential window and higher capacitance.Herein,we demonstrate that α-MoO_(3)/Ti_(3)C_(2)hybrids combine the high capacity of α-MoO_(3)and conductivity of Ti_(3)C_(2)in WIS(19.8 m LiCI)electrolyte in a wide1.8 V voltage window.Cyclic voltammograms reveal multiple redox peaks from α-MoO_(3)in addition to the well-separated peaks of Ti_(3)C_(2)in the hybrid electrode.This leads to a higher specific charge and a higher rate capability compared to a carbon and binder containing α-MoO_(3)electrode.These results demonstrate that the addition of MXene to less conductive oxides eliminates the need for conductive carbon additives and binders,leads to a larger amount of charge stored,and increases redox capacity at higher rates.In addition,MXene encapsulated α-MoO_(3)showed improved electrochemical stability,which was attributed to the suppressed dissolution of α-MoO_(3).The work suggests that oxide/MXene hybrids are promising for energy storage.

关键词： free-standing electrode Ti_(3)C_(2)MXene water-in-salt electrolytes α-MoO_(3)nanobelts

An aqueous 2.1 V pseudocapacitor with MXene and V-MnO_(2) electrodes

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Nano Research 2022年第1期15卷 535-541页

作者： Jiabin Wu Qun Li Christopher E.Shuck Kathleen Maleski Husam N.Alshareef Jun Zhou yury gogotsi Liang Huang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Department of Materials Science and Engineering and A./.Drexel Nanomaterials Institute Drexel UniversityPhiladelphiaPennsylvania 19104USA Materials Science and Engineering Physical Science and Engineering DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia

MXenes have shown record-breaking redox capacitance in aqueous electrolytes,but in a limited voltage window due to oxidation under anodic potential and hydrogen evolution under high cathodic potential.Coupling Ti3C2Tx Xene negative electrode with RuO_(2) or carbon-based positive electrodes expanded the voltage window in sulfuric acid electrolyte to about 1.5 V.Here,we present an asymmetric pseudocapacitor using abundant and eco-friendly vanadium doped MnO_(2) as the positive and Ti_(3)C_(2)Tx MXene as the negative electrode in a neutral 1M Li2SO4 electrolyte.This all-pseudocapacitive asymmetric device not only uses a safer electrolyte and is a much less expensive counter-electrode than RuO_(2),but also can operate within a 2.1 V voltage window,leading to a maximum energy density of 46 Wh/kg.This study also demonstrates the possibility of using MXene electrodes to expand the working voltage window of traditional redox-capable materials.

关键词： MXene pseudocapacitors metal oxides supercapacitors manganese oxide

Enhanced Ionic Accessibility of Flexible MXene Electrodes Produced by Natural Sedimentation

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Nano-Micro Letters 2020年第7期12卷 145-155页

作者： Ning Sun Zhaoruxin Guan Qizhen Zhu Babak Anasori yury gogotsi Bin Xu State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China Department of Materials Science and Engineering and A.J.Drexel Nanomaterials Institute Drexel UniversityPhiladelphiaPA 19104USA Department of Mechanical and Energy Engineering Integrated Nanosystems Development InstitutePurdue School of Engineering and TechnologyIndiana University-Purdue University IndianapolisIndianapolisIN 46202USA

MXene nanosheets have been used for preparing highly flexible integrated electrodes due to their two-dimensional(2D)morphology,flexibility,high conductivity,and abundant functional groups.However,restacking of 2D nanosheets inhibits the ion transport in MXene electrodes,limiting their thickness,rate performance,and energy storage capacity.Here,we employed a natural sedimentation method instead of the conventional vacuum-assisted filtration to prepare flexible Ti3C2TxMXene films with enlarged interlayer spacing,which facilitates the access of the lithium ions to the interlayers and thus leads to a greatly enhanced electrochemical performance.The naturally sedimented flexible film shows a double lithium storage capacity compared to the conventional vacuum-filtered MXene film,along with improved rate performance and excellent cycle stability.

关键词： MXene Natural sedimentation Vacuum filtration Interlayer spacing Li-storage

MXenes-The fastest growing materials family in the two-dimensional world

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Chinese Chemical Letters 2020年第4期31卷 919-921页

作者： Bin Xu yury gogotsi State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China A.J.Drexel Nanomaterials Institute Department of Materials Science States and EngineeringDrexel UniversityPhiladelphiaPA 19104United States

The structural and compositional variety combined with tunable surface characteristics have rendered MXenes as one of the most versatile 2D material families with numerous rapidly expanding application domains.MXenes are typically synthesized by selective etching of layered carbide and nitride precursors,such as MAX phases,which have the general formula Mn+1AXn(n=1-4),where M is an early transition metal.

关键词： MXene render carbide

MXene ink hosting zinc anode for high performance aqueous zinc metal batteries

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Journal of Energy Chemistry 2023年第1期76卷 187-194,I0005页

作者： Jae Min Park Milan Jana Sang Ha Baek Taehun Kang Peixun Xiong Jeong Hee Park Jun Soo Kim Ali Shayesteh Zeraati Mikhail Shekhirev Paul V.Braun yury gogotsi Ho Seok Park School of Chemical Engineering Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Republic of Korea Department of Chemical and Petroleum Engineering University of Calgary2500 University Dr NWCalgary T2N 1N4Canada Department of Materials Science and Engineering Materials Research LaboratoryBeckman Institute for Advanced Science and TechnologyUniversity of Ilinois at Urbana-ChampaignUrbanaIL61801USA A.J.Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel UniversityPhiladelphiaPA 19104USA SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Republic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University 2066SeoburoJangan-guSuwon 440-746Republic of Korea

Despite the safety,low cost,and high theoretical capacity(820 mA h g^(-1))of Zn metal anodes,the practical application of aqueous Zn metal batteries remains a critical challenge due to the Zn dendrite growth,corrosion,and hydrogen evolution reaction.Herein,we demonstrate the MXene ink hosting Zn metal anodes(MX@Zn)for high-performance and patternable Zn metal full batteries.The as-designed MX@Zn electrode is more facile and reversible than bare Zn and CC@Zn,as verified by better cyclic stability and lower overpotentials of symmetric cells with the plating capacity of 0.05 mA h cm^(-2)at 0.1 m A cm^(-2)and of 1 m A h cm^(-2)at 1 m A cm^(-2).The MX@Zn|MnO_(2)full cells deliver a high specific capacity of 281.9 m A h g^(-1),91.5%of the theoretical capacity,achieving 50%capacity retention from 60 mA g^(-1)to 300 mA g^(-1)and 79.7%of initial capacity after 200 cycles.Moreover,the patterned devices based on the MX@Zn electrode achieve high energy and power densities of 348.57 Wh kg^(-1)and 1556 W kg^(-1),respectively,along with a capacity retention of 64%and Coulombic efficiency of 99%over 500 cycles.The high performance of MX@Zn is attributed to the high electrical conductivity and hydrophilicity of MXene and rapid ion diffusion through the 3D interconnected porous channels.

关键词： MXene ink Zinc anode Metal batteries Patterning Electrodeposition

Ti3C2Tx/PEDOT:PSS hybrid materials for room-temperature methanol sensor

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Chinese Chemical Letters 2020年第4期31卷 1018-1021页

作者： Xiaofeng Wang Kaiming Sun Ke Li Xu Li yury gogotsi A.J.Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel UniversityPhiladelphiaPA 19104United States School of Mathematics and Physics Science Dalian University of TechnologyPanjin 124221China

It is essential to develop a methanol gas sensor with high selectivity and low working temperature for human health and environmental monitoring.In this work,a blend of PEDOT:PSS and Ti3C2Tx with the mass ratio of 4:1 is used to fabricate a methanol gas sensor.It possesses a high response ratio of the largest response and the second largest response(5.54)and an enhanced response compared to pure PEDOT:PSS and pure Ti3C2Tx tested at room temperature.These findings may pave the way towards design of the MXenes based high-performance gas-sensing materials in the future.

关键词： Ti3C2Tx MXenes PEDOT:PSS Methanol Gas sensor Room temperature

Capacitance,charge dynamics,and electrolyte-surface interactions in functionalized carbide-derived carbon electrodes

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Progress in Natural Science:Materials International 2015年第6期25卷 631-641页

作者： Boris Dyatkin Eugene Mamontov Kevin M.Cook yury gogotsi Department of Materials Science & Engineering and A.J.Drexel Nanomaterials Institute Drexel University Spallation Neutron Source Oak Ridge National Laboratory Materials Engineering Division Naval Air Systems Command

This study analyzed the dynamics of ionic liquid electrolyte inside of defunctionalized,hydrogenated,and aminated pores of carbide-derived carbon supercapacitor electrodes.The approach tailors surface functionalities and tunes nanoporous structures to decouple the influence of pore wall composition on capacitance,ionic resistance,and long-term cyclability.Quasi-elastic neutron scattering probes the self-diffusion properties and electrode-ion interactions of electrolyte molecules confined in functionalized pores.Room-temperature ionic liquid interactions in confined pores are strongest when the hydrogen-containing groups are present on the surface.This property translates into higher capacitance and greater ion transport through pores during electrochemical cycling.Unlike hydrogenated pores,aminated pores do not favorably interact with ionic liquid ions and,subsequently,are outperformed by defunctionalized surfaces.

关键词： Supercapacitor Carbide-derived carbon Neutron scattering Energy storage Porous materials Surface chemistry