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free-standing hybrid films comprising of ultra-dispersed titania nanocrystals and hierarchical conductive network for excellent high rate performance of lithium storage

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Nano Research 2021年第7期14卷 2301-2308页

作者： Kunlei Zhu Chenyu Li Yushuang Jiao Jiawen Zhu Hongtao Ren Yufeng Luo Shoushan Fan Kai Liu College of Chemistry and Chemical Engineering Qufu Normal UniversityJingxuan West Road NO.57Qufu 273165China State Key Laboratory of New Ceramics and Fine Processing and Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Liaocheng UniversityHunan Road No.1Liaocheng 252000China Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center Tsinghua UniversityBeijing 100084China

The construction of advanced electrode materials is key to the field of energy ***,a free-standing anatase titania(TiO_(2))nanocrystal/carbon nanotube(CNT)film is reported using a simple and scalable sol-gel method,followed by *** unique free-standing film comprises ultra-small TiO_(2) nanocrystals(~5.9 nm)and super-aligned CNTs,with ultra-dispersed TiO_(2) nanocrystals on the surfaces of the *** the one hand,these TiO_(2) nanocrystals can significantly decrease the diffusion distance of the charges and on the other hand,the cross-linked CNTs can act as a three-dimensional(3D)conductive network,allowing the fast transport of *** addition,the film is free-standing,without requiring electrode fabrication and additional conductive agents and *** to these above synergistic effects,the film is directly used as an anode in Li-ion batteries,and delivers a high discharge capacity of~105 mAh·g^(−1) at high rate of 60 C(1 C=170 mA·g^(−1))and excellent cycling performance over 2,500 cycles at 30 *** results indicate that the free-standing anatase TiO_(2) nanocrystal/CNT film affords a superior performance among the various TiO_(2) materials and can be a promising anode material for fast-charging Li-ion ***,the TiO_(2)/CNT film exhibits an areal capacity of up to 2.4 mAh·cm^(−2),confirming the possibility of its practical use.

关键词： carbon nanotubes free-standing high rate Li-ion batteries TiO_(2) ultra-small

free-standing ultrathick LiMn_(2)O_(4)@single-wall carbon nanotubes electrode with high areal capacity

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Journal of Energy Chemistry 2022年第10期31卷 452-459,I0012页

作者： Yuntao Guo Xinhai Li Zhixing Wang Jiexi Wang Huajun Guo Guochun Yan School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083HunanChina Hunan Provincial Key Laboratory of Nonferrous Value-added Metallurgy Central South UniversityChangsha 410083HunanChina

The ever-increasing demands for advanced lithium-ion batteries with high energy density have greatly stimulated the pursuit of thick electrodes with high active material ***,it is not feasible to prepare thick electrodes with traditional coating methods due to mechanical ***,using single-wall carbon nanotubes(SWCNT)as conductive carbon and binder,free-standing LiMn_(2)O_(4) thick electrodes(F-LMO)with ultrahigh-mass loading up to~190 mg cm^(-2)were prepared by vacuum filtration combined with *** thick electrodes with~30 mg cm^(-2)mass loading achieved a high specific capacity of 106.7 mAh g^(-1)with a good capacity retention of 94%over 50 cycles at 0.5 C,which was superior to the traditional coating electrodes(~20 mg cm^(-2))of 99.3 mAh g^(-1)with 95%because of the enhanced electronic conductivity originated from *** addition,the high active material ratio of 97.5 wt%,near-theoretical reversible capacity,and high mass loading gave ultrathick F-LMO electrodes(600μm)of~190 mg cm^(-2)with a remarkable areal capacity of 20 mAh cm^(-2).Moreover,the concentration polarization that occurred in the thick F-LMO electrodes under high current density was discussed via electrochemical stimulation.

关键词： Thick electrodes free-standing High areal capacity Concentration polarization

free-standing Na_(2)C_(6)O_(6)/MXene composite paper for highperformance organic sodium-ion batteries

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Nano Research 2023年第1期16卷 458-465页

作者： Zhengran Wang Yuchan Zhang Huiyu Jiang Chuanliang Wei Yongling An Liwen Tan Shenglin Xiong Jinkui Feng Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education) Research Center for Carbon NanomaterialsSchool of Materials Science and EngineeringShandong UniversityJinan 250061China Shenzhen Institute of Shandong University Shenzhen 518057China

Sodium-ion batteries(SIBs)are regarded as the ideal low-cost choice for next-generation large-scale energy storage ***-based organic salt-disodium rhodizonate(Na_(2)C_(6)O_(6))with high theoretical specific capacity(501 mAh·g−1)is considered as a promising cathode material for ***,the dissolution of active material in electrolyte and low electronic conductivity lead to rapidly capacity decay and poor rate ***,a simple method is designed to construct free-standing and flexible Ti3C2Tx Na2C6O6/MXene paper via vacuum-assisted filtration and antisolvent *** MXene can form an electronic conductive network,adsorb the active materials,and offer additional active sites for Na *** binder-free Na_(2)C_(6)O_(6)/MXene paper delivers excellent electrochemical property with a high rate performance of 231 mAh·g−1 at 1,000 mA·g−1 and a high capacity of 215 mAh·g−1 after 100 *** work provides an attractive strategy for designing high-performance organic electrode materials of SIBs.

关键词： sodium-ion batteries Na_(2)C_(6)O_(6) cathode MXene organic battery flexible free-standing

free-standing SnNb_(2)O_(6)@CSN film as flexible anode for high performance sodium-ion batteries

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Chinese Chemical Letters 2023年第7期34卷 284-288页

作者： Xuemin Yin Tao Liu Xiuping Yin Xiaochen Feng Yiming Liu Qinhao Shi Xingli Zou Yufeng Zhao Institute for Sustainable Energy and College of Sciences Shanghai UniversityShanghai 200444China Department of Materials Science and Engineering Shanghai UniversityShanghai 200072China

free-standing electrodes are promising candidates for flexible rechargeable batteries, toward the application of flexible energy storage devices, due to their merits of additive-free, lightweight, and high energy density. Herein, we report a free-standing SnNb_(2)O_(6)@CSN flexible film with SnNb_(2)O_(6) encapsulated in 3D carbon skeleton nanofibers by electrospinning and carbonization processes as flexible anode for sodium-ion batteries(SIBs). The 3D carbon skeleton nanofibers serve as ion/electron transport pathway to improve the electrochemical reaction kinetics and meanwhile alleviate the volume changes of SnNb_(2)O_(6) during charge-discharge processes. The as-constructed half-cell(SnNb_(2)O_(6)@CSN‖Na) exhibits excellent cycling stability of 99.2 m Ah/g at 0.5 A/g after 950 cycles(coulombic efficiency of ~100%) and a high rate performance of 108.6 mAh/g at 10 A/g. In addition, the pouch cell can light up the LEDs at different bending angles(0°, 90°, 180°). This research shows a promising anode material for flexible energy storage electronics.

关键词： free-standing SnNb_(2)O_(6)@CSN Anode Sodium-ion batteries Flexible material

Facile fabrication of hierarchical porous Co_3O_4 nanoarrays as a free-standing cathode for lithium–oxygen batteries

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Journal of Energy Chemistry 2019年第3期28卷 63-70页

作者： Yanbiao Ren Shuang Zhao Honglei Li Shichao Zhang Jian Liu Yao Xiao College of Materials Science and Engineering Qingdao University of Science and Technology School of Materials Science and Engineering Beihang University

Two shapes of Co_3O_4 nanoarrays(i.e., nanosheets, nanowires) with different densities of exposed catalytic active sites were synthesized through a facile hydrothermal method on Ni foam substrates and tested as the binder/carbon free and free-standing cathodes for Li–O_2 batteries. Particularly, the single crystalline feature of Co_3O_4 nanosheets with a predominant high reactivity {112} exposed crystal plane and hierarchical porous nanostructure displayed better catalytic performance for both oxygen reduction reaction(during discharge process) and oxygen evolution reaction(during charge process). Li–O_2 battery with Co_3O_4 nanosheets cathode exhibited a higher discharge specific capacity(965 m Ah g^(-1)), lower discharge/charge over-potential and better cycling performance over 63 cycles at 100 mA g^(-1) with the specific capacity limited at 300 mAh g^(-1). The superior catalytic performance of Co_3O_4 nanosheets cathode is ascribed to the enlarging specific area and increasing the exposed Co^(3+) catalytic active sites within predominant {112} crystal plane which plays the key role in determining the adsorption energy for the reactants, enabling high round-trip efficiency and cyclic life.

关键词： Cobalt oxide free-standing catalyst Binder/carbon free nanoarrays Over-potential Cyclic life

The concept and realization of nanostructure fabrication using free-standing metallic wires with rapid thermal annealing

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Science China(Physics,Mechanics & Astronomy) 2015年第4期58卷 84-90页

作者： CUI AJuan HAO TingTing LI Wu Xia SHEN TieHan LIU Zhe JIANG QianQing GU ChangZhi Beijing National Laboratory of Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Joule Physics Laboratory School of CSE College of Science and Technology University of Salford Collaborative Innovation Center of Quantum Matter

free-standing metallic nanostructures are considered to be highly relevant to many branches of science and technology with applications of three dimensional metallic nanostructures ranging from optical reflectors,actuators,and antenna,to free-standing electrodes,mechanical,optical,and electrical resonators and ***-induced out-of-plane fabrication has emerged as an effective method which uses relaxation of strain-mismatched *** this work,we report a study of the thermal annealing-induced shape modification of free-standing nanostructures,which was achieved by introducing compositional or microstructural nonuniformity to the *** particular gradient,segmented and striped hetero-nanowires were grown by focused-ion-beam-induced chemical vapor deposition,followed by rapid thermal annealing in a N2 *** free-standing nanostructures were produced as a result of the crystalline/grain growth and stress relief.

关键词： thermal annealing strain.induced deformation free-standing three-dimensional nanofabrication

In Situ Mineralization of Biomass-Derived Hydrogels Boosts Capacitive Electrochemical Energy Storage in free-standing 3D Carbon Aerogels

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Energy & Environmental Materials 2024年第2期7卷 359-371页

作者： Anjali Achazhiyath Edathil Babak Rezaei Kristoffer Almdal Stephan Sylνest Keller National Centre for Nano Fabrication and Characterization DTU NanolabTechnical University of Denmark2800LyngbyDenmark DTU Chemistry Technical University of Denmark2800LyngbyDenmark

Here,a novel fabrication method for making free-standing 3D hierarchical porous carbon aerogels from molecularly engineered biomass-derived hydrogels is *** situ formed flower-like CaCO_(3)molecularly embedded within the hydrogel network regulated the pore structure during in situ mineralization assisted one-step activation graphitization(iMAG),while the intrinsic structural integrity of the carbon aerogels was *** homogenously distributed minerals simultaneously acted as a hard template,activating agent,and graphitization *** decomposition of the homogenously distributed CaCO_(3)during iMAG followed by the etching of residual CaO through a mild acid washing endowed a robust carbon aerogel with high porosity and excellent electrochemical *** 0.5 mA cm^(-2),the gravimetric capacitance increased from 0.01 F g^(-1)without mineralization to 322 F g^(-1)with iMAG,which exceeds values reported for any other free-standing or powder-based biomass-derived carbon *** outstanding cycling stability of~104%after 1000 cycles in 1 M HClO4 was *** assembled symmetric supercapacitor device delivered a high specific capacitance of 376 F g^(-1)and a high energy density of 26 W h kg^(-1)at a power density of 4000 W kg^(-1),with excellent cycling performance(98.5%retention after 2000 cycles).In combination with the proposed 3D printed mold-assisted solution casting(3DMASC),iMAG allows for the generation of free-standing carbon aerogel architectures with arbitrary ***,the novel method introduces flexibility in constructing free-standing carbon aerogels from any ionically cross-linkable biopolymer while maintaining the ability to tailor the design,dimensions,and pore size distribution for specific energy storage applications.

关键词： biomass carbon aerogel sustainable energy materials free-standing supercapacitors

From 0D to 3D:Hierarchical structured high-performance free-standing silicon anodes based on binder-induced topological network architecture

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Journal of Energy Chemistry 2024年第6期93卷 16-23,I0002页

作者： Yihong Tong Ruicheng Cao Guanghui Xu Yifeng Xia Hongyuan Xu Hong Jin Hui Xu Xi’an Jiaotong University Suzhou Academy Suzhou 215123JiangsuChina Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123JiangsuChina

free-standing silicon anodes with high proportion of active materials have aroused great attention;however,the mechanical stability and electrochemical performance are severely ***,to resolve the appeal issues,a free-standing anode with a"corrugated paper"shape on micro-scale and a topological crosslinking network on the submicron and nano-scale is ***,an integrated three-dimensional electrode structure is constructed based on robust carbon nanotubes network with firmly anchored SiNPs via forming interlocking *** which,the hierarchical interlocking structure is achieved by directional induction of the binder,which ensures well integration during cycling so that significantly enhances mechanical stability as well as electronic and ionic conductivity of *** from it,this anode exhibits outsta nding performance under harsh service conditions including high Si loading,ultrahigh areal capacity(33.2 mA h cm^(-2)),and high/low temperatures(-15-60℃),which significantly extends its practical ***,the optimization mechanism of this electrode is explored to verify the crack-healing and structure-integration maintaining along cycling via a unique self-stabilization ***,from both the fundamental and engineering views,this strategy offers a promising path to produce high-performance free-standing electrodes for flexible device applications especially facing volume effect challenges.

关键词： Topological network Self-stabilization Flexibility free-standing Silicon anode

Bismuth-Based free-standing Electrodes for Ambient-Condition Ammonia Production in Neutral Media

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Nano-Micro Letters 2020年第10期12卷 164-175页

作者： Ying Sun Zizhao Deng Xi‑Ming Song Hui Li Zihang Huang Qin Zhao Daming Feng Wei Zhang Zhaoqing Liu Tianyi Ma Institute of Clean Energy Chemistry Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced MaterialsCollege of ChemistryLiaoning UniversityShenyang 110036People’s Republic of China Discipline of Chemistry University of NewcastleCallaghanNSW 2308Australia Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials College of ChemistryLiaoning UniversityShenyang 110036People’s Republic of China School of Chemistry and Chemical Engineering Guangzhou Key Laboratory for Environmentally Functional Materials and TechnologyGuangzhou UniversityGuangzhou 510006People’s Republic of China

Electrocatalytic nitrogen reduction reaction is a carbon-free and energy-saving strategy for efficient synthesis of ammonia under ambient ***,we report the synthesis of nanosized Bi2O3 particles grown on functionalized exfoliated graphene(Bi2O3/FEG)via a facile electrochemical deposition *** obtained free-standing Bi2O3/FEG achieves a high Faradaic efficiency of 11.2%and a large NH3 yield of 4.21±0.14μgNH3 h^-1 cm^-2 at-0.5 V versus reversible hydrogen electrode in 0.1 M Na2SO4,better than that in the strong acidic and basic *** from its strong interaction of Bi 6p band with the N2p orbitals,binder-free characteristic,and facile electron transfer,Bi2O3/FEG achieves superior catalytic performance and excellent long-term stability as compared with most of the previous reported *** study is significant to design low-cost,high-efficient Bi-based electrocatalysts for electrochemical ammonia synthesis.

关键词： N2 reduction Bi2O3 nanoplate Electrocatalysis free-standing