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2D free-standing ultra-large ferromagnetic nanosheets via a topotactic transformation strategy

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Science China Chemistry 2025年

作者： Haofeng Sun Minghao Wang Wenjie Li Yang Liu Xinyu Sun Wenjie Wang Yuqiao Guo Yi Xie changzheng wu Key Laboratory of Precision and Intelligent Chemistry University of Science&Technology of China National Synchrotron Radiation Laboratory University of Science and Technology of China

Considerable progress has been made in synthesizing two-dimensional （2D） materials by exfoliating layered ***,for tremendous non-layered inorganic materials,especially magnet solids,usually with closely packed bulk phases by strong chemical bonds,it is challenging to obtain their high-quality 2D ***,we highlighted a new structure of free-standing ferromagnetic nanosheets featuring （111） *** magnet,Fe3O4,its inversed spinel crystalline has limited abilities to exfoliate into 2D forms and rarely exists as free-standing nanosheets owing to aggregation induced by magnetic *** realized a breakthrough in achieving free-standing ferromagnetic nanosheets with dramatically surpassing size limitations via topotactic conversion from layered *** Fe3O4nanosheets exhibited a maximum width of 60μm while only～4 nm thick,prominently exposing （111） facets.2D Fe3O4behaved anisotropic magnetism,which displayed a 4.6 emu g-1moment（H=500 Oe） in the （111） plane but 2.1 emu g-1out of the （111） plane,indicating a （111） in-plane easy *** anticipated our topotactic conversion strategy would inspire the creation of 2D non-layered materials and enrich the 2D materials family.

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Boosting the electrochromic performance of TiO_(2) nanowire film via successively evolving surface structure

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Science China Chemistry 2021年第5期64卷 745-752页

作者： Baohu Dai changzheng wu Yi Xie Department of Chemistry School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Chemistry for Energy Materials University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of ChinaHefei 230026China

Electrochromic transition metal oxides(ETMOs)are useful in energy saving devices and smart *** these ETMO candidates,titanium dioxide(TiO_(2))is intriguing for its abundance and environmental safety,but the low color efficiency and slow coloring rate are still barricades to promote its electrochromic ***,we demonstrate an amorphization strategy to comprehensively enhance the performance of TiO_(2) nanowire film(TNF)via atomic layer deposition(ALD)of an additional TiO_(2) conformal layer onto TNF surface,of which the layer structure evolves successively from ordered to disordered,achieving tunable electrochromism by controlling ALD *** the remarkable increment of charging efficiency by~35% and color efficiency by~40%,bleached transmittance rectified optical density(BTR density)and ion diffusion coefficient are boosted by~90% and over 15 times,respectively for TNF deposited with 150 cycles.A large number of self-doped Ti^(3+) defects and hydroxyl units together with order-disorder interconnections in the ALD TiO_(2) layer are responsible for the performance *** concept for successively evolving surface structure shares the feasibility of upgrading conventional ETMOs as well as designing new electrochromic materials.

关键词： electrochromism TiO_(2) evolving surface structure BTR density ALD

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Preface: Special topic on electrocatalysis & energy science

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Science China Chemistry 2020年第11期63卷 1515-1516页

作者： changzheng wu Gang wu Guihua Yu Hefei National Laboratory for Physical Science at the Microscale CAS Center for Excellence in NanoscienceiChEM(Collaborative Innovation Center of Chemistry for Energy Materials)University of Science and Technology of ChinaHefei 230026China Institute of Energy Hefei Comprehensive National Science CenterHefei 230026China Department of Chemical and Biological Engineering University at BuffaloThe State University of New YorkBuffaloNY 14260USA Materials Science and Engineering Mechanical EngineeringTexas Materials InstituteUniversity of Texas at AustinAustinTX 78712USA

Electrocatalysis is one type of *** catalysts at the electrode/electrolyte interfaces can facilitate electrochemical reactions with high rates and stability via selective pathways at potentials close to their thermodynamic limits(i.e.,minimum overpotentials).The first elaborated study for electrocatalysis can be dated back to the 1920s when Bowden and Rideal examined the electrolytic behaviors of a series of metal films for hydrogen ***,it is not until 1963 that Grubb used the word“electrocatalysis”for the first time to name the electrochemical processes in fuel cells.

关键词： electrocatalysis electrolyte electrolytic

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Local structure engineering for active sites in fuel cell electrocatalysts

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Science China Chemistry 2020年第11期63卷 1543-1556页

作者： Han Cheng Renjie Gui Si Liu Yi Xie changzheng wu Hefei National Laboratory for Physical Science at the Microscale CAS Centre for Excellence in NanoscienceCollaborative Innovation Centre of Chemistry for Energy Materials(iChEM)CAS Key Laboratory of Mechanical Behavior and Design of MaterialsUniversity of Science and Technology of ChinaHefei 230026China Institute of Energy Hefei Comprehensive National Science CenterHefei 230026China

In this review,we surveyed the significance of local structure engineering on electrocatalysts and electrodes for the performance of oxygen reduction reaction(ORR)in proton exchange membrane fuel cells(PEMFCs).Both on precious metal catalysts(PMC)and non-precious metal catalysts(NPMC),the main methods to modulate local structure of active sites have been *** change of atomic coordination,modulation of bonding distortion and synergy effect from hierarchical structure,local structure engineering has influence on the intrinsic activity and stability of ***,we emphasized the intimate correlation between lyophobicity of electrocatalysts and membrane electrodes by local structure *** review aimed to inspire the exploration of advanced electrocatalysts and mechanism study for PEMFCs based on local structure engineering.

关键词： local structure engineering proton exchange membrane fuel cells oxygen reduction reaction active sites

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Intercalation-assisted Exfoliation Strategy for Two-dimensional Materials Preparation

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Chemical Research in Chinese Universities 2020年第4期36卷 518-524页

作者： ZHAO Yingchcng SU Yucqi GUO Yuqiao wu changzheng Hefei National Laboratory for Physical Sciences at the Microscale iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)CAS Key LMboratoty of Mechanical Behavior and Design of MaterialsUniversity of Science and Technology of ChinaHefei 230026P.R.China

Controlled large-quantity synthesis of two-dimensional materials is vital for the research on their physical and chemical characters and potential *** structural features of layered compounds,intercalation of molecules or ions can be applied to the acceleration of liquid-phase *** this review,we aim at recent progress on synthesis of two-dimensional materials via intercalation-assisted exfoliation *** on wet chemical intercalation and electrochemical intercalation,together with product exfoliation afterwards,are ***,the features and advantages of intercalation-assisted exfoliation strategy for two-dimensional materials synthesis are discussed.

关键词： Two-dimensional material Liquid-phase exfoliation Intercalation

Room-temperature ligancy engineering of perovskite electrocatalyst for enhanced electrochemical water oxidation

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Nano Research 2019年第9期12卷 2296-2301页

作者： Junchi wu Yuqiao Guo Haifeng Liu Jiyin Zhao Haodong Zhou Wangsheng Chu changzheng wu Hefei National Laboratory for Physical Sciences at the Microscale Collaborative Innovation Center of Chemistry far Energy Materials (iChEM)and CAS Key Laboratory of Mechanical Behavior and Design of MaterialsUniversity of Science and Technology of ChinaHefei 230026China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026China Analytical and Testing Center Southwest University of Science and TechnologyMianyang 621010China

Perovskite oxides are significant candidates to develop electrochemical catalysts for water oxidation in consideration of their high catalysis capacity,low costing and excellent *** design of coordination structure and overcoming poor electronic transport are regarded as critical factors for outstanding perovskite-based oxygen evolution reaction (OER) ***,we report a mild chemical oxidation method to realize ligancy engineering from strongly-correlated brownmillerite Sr2Co2O5 to perovskite phase Sr2Co2O5.5,along with abundant oxygen vacancies formation and greatly boosted electric conductivity,which helps to form the active species of Co hydroxide/oxide on the surface of *** coupling effect of catalytic kinetics and unimpeded electronic movement brings high OER activities in Sr2Co2O5.5 with a low onset potential and a small Tafel *** work not only displays in-depth understanding into the relationship among catalysis performance and multiple physical degrees of freedom,but also paves a new path to develop high-efficient electrochemical catalysts.

关键词： perovskite oxides ligancy engineering oxygen evolution reaction electrocatalysts

Metallic mesocrystal nanosheets of vanadium nitride for high-performance all-solid-state pseudocapacitors

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Nano Research 2015年第1期8卷 193-200页

作者： Wentuan Bi Zhenpeng Hu Xiaogang Li changzheng wu Junchi wu Yi Xie Hefei National Laboratory for Physical Sciences at Microscale and Collaborative Innovation Center of Chemistry for Energy Materials University of Science and Technology of China Hefei 230026 China School of Physics Nankai University Tianjin 300071 China

Transition metal nitrides （TMNs） are of particular interest by virtue of their synergic advantages of superior electrical conductivity, excellent environmental durability and high reaction selectivity, yet it is difficult to achieve flexible design and operation. Herein, mesocrystal nanosheets （MCNSs） of vanadium nitride （VN） are synthesized via a confined-growth route from thermally stable layered vanadium bronze, representing the first two-dimensional （2D） metallic mesocrystal in inorganic compounds. Benefiting from their single-crystalline-like long-range electronic connectivity, VN MCNSs deliver an electrical conductivity of 1.44×10^5 S/m at room temperature, among the highest values observed for 2D nanosheets. Coupled with their unique pseudocapacitance, VN MCNS-based flexible supercapacitors afford a superior volumetric capacitance of 1,937 mF/cm3. Nitride MCNSs should have wide applications in the energy storage and conversion fields because their intrinsic high conductivity is coupled with the reactivity of inorganic lattices.

关键词： vanadium nitride mesocrystal nanosheets confined growth supercapacitors chemical and thermal stability

Aqueous Synthesis of Mesostructured BiVO_(4) Quantum Tubes with Excellent Dual Response to Visible Light and Temperature

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Nano Research 2010年第9期3卷 620-631页

作者： Yongfu Sun Yi Xie changzheng wu Shudong Zhang Shishi Jiang Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of ChinaHefei 230026China

Analysis of the atomic structure of monoclinic BiVO4 reveals its fascinating structure-related dual response to visible light and *** there have been a few reported studies of its responses to visible light and temperature,an understanding of the effects of quantum size,particle shape or specific exposed facets on its dual responsive properties remains elusive;this is primarily due to the limited availability of high-quality monodisperse nanocrystals with extremely small sizes and specific_(4)exposed ***,we describe a novel assembly-fusion strategy for the synthesis of mesostructured monoclinic BiVO_(4)quantum tubes with ultranarrow diameter of 5 nm,ultrathin wall thickness down to 1 nm and exposed{020}facets,via a convenient hydrothermal method at temperatures as low as 100℃.Notably,the resulting high-quality quantum tubes possess significantly superior dual-responsive properties compared with bulk BiVO_(4)or even BiVO4 nanoellipsoids,and thus,show high promise for applications as visible-light photocatalysts and temperature indicators offering improved environmental quality and *** mild and facile methodology should be capable of extension to the preparation of other mesostructured inorganic quantum tubes with similar characteristics,giving a range of materials with enhanced dual-responsive properties.

关键词： Mesostructure BiVO_(4) quantum tubes visible light temperature

Surface-adsorbed ions on TiO2 nanosheets for selective photocatalytic CO2 reduction

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Nano Research 2018年第6期11卷 3362-3370页

作者： Xiaogang Li Wentuan Bi Zhe Wang Wenguang Zhu Wangsheng Chu changzheng wu Yi Xie Hefei National Laboratory for Physical Sciences at the Microscale iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) and CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of China Hefei 230026 China International Center for Quantum Design of Functional Materials (ICQD) Hefei National Laboratory for Physical Sciences at the Microscale (HFNL) Synergetic Innovation Center of Quantum Information and Quantum Physics Department of Physics and Key Laboratory of Strongly-Coupled Quantum Matter Physics Chinese Academy of Sciences School of Physical Sciences University of Science and Technology of China Hefei 230026 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei230026 China

A method based on the adsorption of ions on the surface of two-dimensional （2D） nanosheets has been developed for photocatalytic COz reduction. Isolated Bi ions, confined on the surface of TiO2 nanosheets using a simple ionic adsorption method facilitate the formation of a built-in electric field that effectively promotes charge carrier separation. This leads to an improved performance of the photocatalytic COa reduction process with the preferred conversion to CH4. The proposed surface ion-adsorption method is expected to provide an effective approach for the design of highly efficient photocatalytic systems. These findings could be very valuable in photocatalytic CO2 reduction applications.

关键词： two-dimensional nanomaterials surface modification ion adsorption photocatalysis TiO2 nanosheets