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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 ***,restacking of 2D nanosheets inhibits the ion transport in MXene electrodes,limiting their thickness,rate performance,and energy storage ***,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 *** 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

A mini-review on MXenes as versatile substrate for advanced sensors

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Chinese Chemical Letters 2020年第4期31卷 922-930页

作者： Razium Ali Soomro Sana Jawaid qizhen zhu Zaheer Abbas Bin Xu Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China National Centre of Excellence in Analytical Chemistry University of SindhJamshoro 76080Pakistan

MXenes have emerged as versatile 2D materials that are already gaining paramount attention in the areas of energy,catalyst,electromagnetic shielding,and *** unique surface chemistry,graphene-like mo rphology,high hydrophilicity,metal-like conductivity with redox capability identifies MXenes,as an ideal material for surface-related *** short review summarizes the most recent reports that discuss the potential application of MXenes and their hybrids as a transducer material for advanced *** on the nature of transducing signals,the discussion is categorized into three sections,which include electrochemical(bio)sensors,gas sensors,and finally,electro-chemiluminescence&fluorescent *** review provides a concise summary of all the analytical merits obtained subsequent to the use of MXenes,followed by endeavors that have been made to accentuate the future perspective of MXenes in sensor devices.

关键词： MXenes Electrochemical sensors Gas sensors Electrochemiluminescent sensor Fluorescent sensors

3D Foam-Based MXene Architectures:Structural and Electrolytic Engineering for Advanced Potassium-Ion Storage

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Energy & Environmental Materials 2024年第4期7卷 64-73页

作者： Peng Zhang Yanmeng Peng qizhen zhu Razium Ali Soomro Ning Sun Bin Xu State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China Beijing Advanced Innovation Centre for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

MXenes are emerging rapidly as promising electrode materials for energy storage due to their high electronic conductivity and rich surface chemistry,but their potassium storage performance is unsatisfactory because of the large size of K^(+)and irreversible interfacial ***,a developed 3D foam-like MXene scaffold(3D-FMS)is constructed via an electrostatic neutralization of Ti_(3)C_(2)T_(x)with positive-charged melamine followed with calcination,which offers massive surface-active sites and facilitates fast K^(+)transfer for boosting the potassium-ion storage capacity and *** addition,using KFSI-based electrolyte,the formation of a robust solid electrolyte interface layer with more inorganic components on MXene anode is revealed for enhancing the Coulombic ***,the 3DFMS with KFSI-based electrolyte delivers enhanced potassium-ion storage performance in terms of capacity(161.4 mAh g^(-1)at 30 mA g^(-1)),rate capability(70 mAh g^(-1)at 2 A g^(-1)),and cycling stability(80.5 mAh g^(-1)at 1 A g^(-1)after 2000 cycles).Moreover,the assembled 3D-FMS//activated carbon potassium-ion hybrid supercapacitor delivers a high energy density of 57 Wh kg^(-1)at a power density of 290 W kg^(-1).These excellent performances demonstrate the great superiority of 3D-FMS in KFSI-based electrolyte and may accelerate the development of MXene-based materials for potassium storage systems.

关键词： 3D foam-like scaffold electrolyte chemistry electrostatic neutralization MXene potassium-ion batteries

Facile synthesis of rutile TiO2/carbon nanosheet composite from MAX phase for lithium storage

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Journal of Materials Science & Technology 2019年第9期35卷 1977-1981页

作者： Zhaoruxin Guan Xiaoxue Wang Tingting Li qizhen zhu Mengqiu Jia Bin Xu State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical Technology

Titanium oxide(TiO2),with excellent cycling stability and low volume expansion,is a promising anode material for lithium-ion battery(LIB),which suffers from low electrical conductivity and poor rate *** nano-sized TiO2 with conductive materials is proved an efficient method to improve its electrochemical ***,rutile TiO2/carbon nanosheet was obtained by calcinating MAX(Ti3AlC2)and Na2C03 together and water-bathing with *** lamellar carbon atoms in MAX are converted to 2D carbon nanosheets with urchin-like rutile TiO2 anchored *** unique architecture can offer plentiful active sites,shorten the ion diffusion distance and improve the *** composite exhibits a high reversible capacity of 247 mA h g^-1,excellent rate performance(38 mA h g^-1 at 50 C)and stable cycling performance(0.014%decay per cycle during 2000 cycles)for lithium storage.

关键词： TiO2/C Composite Anode Lithium ion battery MAX

Multiple conductive network for KTi_(2)(PO_(4))_(3)anode based on MXene as a binder for high-performance potassium storage

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Chinese Chemical Letters 2024年第8期35卷 539-544页

作者： Tong Su Yue Wang qizhen zhu Mengyao Xu Ning Qiao Bin Xu State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China

KTi_(2)(PO_(4))_(3)is a promising anode material for potassium storage,but suffers from low conductivity and difficult balance between high capacity and good structural ***,the Ti_(3)C_(2)T_(x)MXene is used as a multifunctional binder to fabricate the KTi_(2)(PO_(4))_(3)electrode by the traditional homogenizing-coating *** MXene nanosheets,together with the conductive agent super P nanoparticles,construct a multiple conductive network for fast electron/ion transfer and high electrochemical ***,the network ensures the structural stability of the KTi_(2)(PO_(4))_(3)electrode during the de-intercalation/intercalation of 4 K^(+)ions,which is beneficial for simultaneously achieving high capacity and good cycle ***,the MXene-bonded KTi_(2)(PO_(4))_(3)electrode delivers a reversible capacity of 255.2 mAh/g at 50 mA/g,outstanding rate capability with 132.3 mAh/g at 2 A/g,and ex-cellent cycle performance with 151.6 mAh/g at 1 A/g after 2000 *** work not only suggests a high-performance anode material for potassium-ion batteries,but also demonstrates that the MXene is a promising binder material for constructing conductive electrodes in rechargeable batteries.

关键词： MXene Ti_(3)C_(2)T_(x) KTi_(2)(PO_(4))_(3) Anode Conductive network Potassium storage

3D crumbled MXene for high-performance supercapacitors

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Chinese Chemical Letters 2020年第9期31卷 2305-2308页

作者： Xin Zhang Jiawei Miao Peng Zhang qizhen zhu Mingchi Jiang Bin Xu State Key Laboratory of Organic–Inorganic Composites Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China

MXene materials have recently attracted considerable attention in energy storage application owing to their metallic conductivity,2D structure and tunable surface ***,the restacking of 2D MXene nanosheets hinders the ion transport and accessibility to the surface,resulting in adverse effect on their electrochemical ***,with the assistance of hexamethylenetetramine(C6H12N4),2DTi3C2Tx MXene nanosheets were fabricated into a 3D architecture with crumbled and porous structure through an electrostatic self-assembly followed by *** resultant 3D structure can expose massive active sites and facilitates the ion transport,which is beneficial for sufficient utilization of the outstanding superiorities of the ***,as a pseudocapacitive material,the 3D crumpled and porous Ti3C2Tx MXene shows a gravimetric capacitance of 333 F/g at 1 A/g,and maintains 261 F/g and 132 F/g at ultrahigh current densities of 100 A/g and 1000 A/g,respectively,revealing promising potential for application in supercapacitors.

关键词： Supercapacitors MXene nanosheets 3D porous structure Capacitance Rate performance

Electrostatic Self-assembly of 0D–2D SnO_(2) Quantum Dots/Ti_(3)C_(2)T_(x) MXene Hybrids as Anode for Lithium-Ion Batteries

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Nano-Micro Letters 2019年第4期11卷 161-172页

作者： Huan Liu Xin Zhang Yifan zhu Bin Cao qizhen zhu Peng Zhang Bin Xu Feng Wu Renjie Chen School of Materials Science and Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081People’s Republic of China 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

MXenes,a new family of two-dimensional(2D)materials with excellent electronic conductivity and hydrophilicity,have shown distinctive advantages as a highly conductive matrix material for lithium-ion battery ***,a facile electrostatic self-assembly of SnO2 quantum dots(QDs)on Ti3C2Tx MXene sheets is *** as-prepared SnO2/MXene hybrids have a unique 0D-2D structure,in which the 0D SnO2 QDs(~4.7 nm)are uniformly distributed over 2D Ti3C2Tx MXene sheets with controllable loading *** SnO2 QDs serve as a high capacity provider and the“spacer”to prevent the MXene sheets from restacking;the highly conductive Ti3C2Tx MXene can not only provide efficient pathways for fast transport of electrons and Li ions,but also buffer the volume change of SnO2 during lithiation/delithiation by confining SnO2 QDs between the MXene ***,the 0D-2D SnO2 QDs/MXene hybrids deliver superior lithium storage properties with high capacity(887.4 mAh g?1 at 50 mA g?1),stable cycle performance(659.8 mAh g?1 at 100 mA g?1 after 100 cycles with a capacity retention of 91%)and excellent rate performance(364 mAh g?1 at 3 A g?1),making it a promising anode material for lithium-ion batteries.

关键词： MXene SnO_(2) Quantum dots 0D-2D hybrid Lithium-ion battery

Plate-to-Layer Bi2MoO6/MXene-Heterostructured Anode for Lithium-Ion Batteries

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Nano-Micro Letters 2019年第4期11卷 439-452页

作者： Peng Zhang Danjun Wang qizhen zhu Ning Sun Feng Fu 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 Shaanxi Key Laboratory of Chemical Reaction Engineering School of Chemistry and Chemical EngineeringYan’an UniversityYan’an 716000People’s Republic of China

Bi2MoO6 is a potentially promising anode material for lithiumion batteries(LIBs)on account of its high theoretical capacity coupled with low desertion *** to low conductivity and large volume expansion/contraction during charge/discharge cycling of Bi2MoO6,effective modification is indispensable to address these *** this study,a plate-to-layer Bi2MoO6/Ti3C2Tx(MXene)heterostructure is proposed by electrostatic assembling positive-charged Bi2MoO6 nanoplates on negative-charged MXene *** nanosheets in the heterostructure act as a highly conductive substrate to load and anchor the Bi2MoO6 nanoplates,so as to improve electronic conductivity and structural *** the mass ratio of MXene is optimized to 30%,the Bi2MoO6/MXene heterostructure exhibits high specific capacities of 692 mAh g?1 at 100 mA g?1 after 200 cycles and 545.1 mAh g?1 with 99.6%coulombic efficiency at 1 A g?1 after 1000 *** results provide not only a highperformance lithium storage material,but also an effective strategy that could address the intrinsic issues of various transition metal oxides by anchoring them on MXene nanosheets to form heterostructures and use as anode materials for LIBs.

关键词： Bi2MoO6 MXene Electrostatic self-assembly Heterostructure Lithium-ion batteries

MOF-Derived ZnS Nanodots/Ti_(3)C_(2)T_(x) MXene Hybrids Boosting Superior Lithium Storage Performance

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Nano-Micro Letters 2021年第12期13卷 247-263页

作者： Bin Cao Huan Liu Xin Zhang Peng Zhang qizhen zhu Huiling Du Lianli Wang Rupeng Zhang 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 College of Materials Science and Engineering Xi’an University of Science and TechnologyXi’an 710054People’s Republic of China

ZnS has great potentials as an anode for lithium storage because of its high theoretical capacity and resource abundance;however,the large volume expansion accompanied with structural collapse and low conductivity of ZnS cause severe capacity fading and inferior rate capability during lithium storage. Herein,0D-2 D ZnS nanodots/Ti_(3)C_(2)T_x MXene hybrids are prepared by anchoring ZnS nanodots on Ti_(3)C_(2)T_(x) MXene nanosheets through coordination modulation between MXene and MOF precursor(ZIF-8) followed with sulfidation. The MXene substratecoupled with the ZnS nanodots can synergistically accommodate volume variation of ZnS over charge–discharge to realize stable cyclability. As revealed by XPS characterizations and DFT calculations,the strong interfacial interaction between ZnS nanodots and MXene nanosheets can boost fast electron/lithium-ion transfer to achieve excellent electrochemical activity and kinetics for lithium storage. Thereby,the as-prepared ZnS nanodots/MXene hybrid exhibits a high capacity of 726.8 mAh g^(-1) at 30 mA g^(-1),superior cyclic stability(462.8 mAh g^(-1) after 1000 cycles at 0.5 A g^(-1)),and excellent rate performance. The present results provide new insights into the understanding of the lithium storage mechanism of ZnS and the revealing of the e ects of interfacial interaction on lithium storage performance enhancement.

关键词： Ti_(3)C_(2)T_(x)MXene MOF Interfacial interaction Heterointerface ZnS Lithium-ion batteries