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Cr-doped Na_(3)V_(2)(PO_(4))_(3)@C enables high-capacity with V^(2+)/V^(5+)reaction and stable sodium storage

Journal of materials Science & technology 2023年第34期165卷 1-7页

作者： Bo Mai Boyu Xing Yunfan Yue Nianyao Cai Congcong Cai Sitian Lian Hao Fan Mengyu Yan Ting Zhu Ping Hu Xuewen Wang Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong LaboratoryFoshan 528216China

Due to its abundant sodium content and low cost,sodium-ion battery(SIB)has become an effective substitute and supplement for lithium-ion batteries,which has a broad development prospect in largescale energy storage ***-super-ionic conductor(NASICON)structural materials have stable 3D skeleton structures and open Na+transport channels,which is a very promising SIB cathode *** in the typical NASICON material Na_(3)V_(2)(PO_(4))_(3)(NVP),the number of electrons involved in NVP per formula unit is less than 2 at the stable voltage window,which limits the further improvement of battery *** this work,we report another NASICON structured Na_(3)V_(4/3)Cr_(2/3)(PO_(4))_(3)@C(NVCP@C),which is obtained by Cr-doped NVP through spray *** taking full advantage of the voltage platforms of V^(5+/4+),V^(4+/3+),and V^(3+/2+)in the window of 1.5-4.4 V,NVCP@C delivered a high discharge capacity(175 mAh g^(-1))and durable cyclability(86%capacity retention for 2000 cycles).In-situ X-ray diffraction results demonstrate that the reversible structural evolution accompanies by solid-solution reaction and two-phase reaction mechanisms co-exist during charge/discharge *** coupled with Na^(+)preembedded hard carbon(HC),the assembled NVCP@C//HC full cell delivers a high capacity(105 mAh g^(-1))and long cycling performance(70%after 1000 cycles).This Cr-doped NVP method offers new insights into the design of high-energy NASICON-structured cathode materials.

关键词： Sodium-ion batteries NASICON Na_(3)V_(4/3)Cr_(2/3)(PO_(4))_(3)@C Spray drying V^(2+)/V^(5+)reaction

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Thermodynamics aided design of hBN-capsulated diboride powders from novel nitrate precursors for high entropy ceramics

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Journal of materials Science & technology 2024年第11期178卷 133-142页

作者： Hailing Yang Ji Zou Zhimin Xiong Jingjing Liu Weimin Wang Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China

Hexagonal BN-coated powders have been widely used in various engineering sectors,however,their pro-ductions are restricted by the complexity of gas-solid *** this study,guided by thermodynamics,a novel approach to synthesize Layer-structured hexagonal BN(hBN)-coated high entropy diboride pow-ders in vacuum was developed,using metal salt Zr(NO_(3))4·5H_(2)O,HfCl_(4),NbC_(15),TaC_(15),C_(16)H_(36)O_(4)Ti,boric acid,and sucrose as raw *** adjusting the ratio of carbon to metal source(C/M),powders only consisting of two boride solid solutions and hBN were finally obtained,under an optimal process-ing condition of C/M=5.5 and synthesis temperature of 1400 ℃.Parts of hBN were found to coat on high-entropy metal diborides ceramic(HEB)particles,corresponding formation mechanism for core-shell structured powders was investigated,together with the liquid precursor assisted boro/carbothermal re-duction *** from as-synthesized core-shell powders,(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))B2-11 vol%hBN ceramics were densified at 1900 ℃ under 50 MPa without holding,with a high relative density of 97.3%.

关键词： High entropy boride Boro/carbothermal reduction Sol-gel Core-shell powders Densification

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Improving Cyclic Stability and Rate Performance of Lithium Ion Batteries Using La^(3+)Modified LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)Cathode materials

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Journal of Wuhan University of technology(materials Science) 2023年第4期38卷 735-742页

作者：杜玉喆 RUAN Zhefei ZHANG Ruiming 张海宁 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan528200China

La_(4)NiLiO_(8)-coated NCM622 samples were prepared through a sol-gel method,and the electrochemical performance as cathode materials was *** is revealed that part of the introduced La^(3+)ions produce a coating layer on the surface of NCM622 particles,while the rest occupy the 3b position of the *** optimized sample exhibits a capacity retention of 96.54%after 100 cycles under 1C rate with a discharge specific capacity of 117.54 mAh·g^(-1)under 5C rate,much higher than those of the unmodified *** results show that the addition of La^(3+)ion can greatly improve the cyclic stability and the rate performance of NCM622.

关键词： lithium ion batter La^(3+)doping NCM622 cycling stability rate performance

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Valence Bands Convergence in p-Type CoSb_(3) through Electronegative Fluorine Filling

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Chinese Physics Letters 2024年第7期41卷 87-94页

作者：黄写格李家良马浩钦李昌隆刘天乐段波翟鹏程李国栋 Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of TechnologyWuhan 430070China School of Civil Engineering&Architecture Wuhan Polytechnic UniversityWuhan 430023China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Band convergence is considered to be a strategy with clear benefits for thermoelectric performance,generally favoring the co-optimization of conductivity and Seebeck coefficients,and the conventional means include elemental filling to regulate the ***,the influence of the most electronegative fluorine on the CoSb_(3) band remains *** carry out density-functional-theory calculations and show that the valence band maximum gradually shifts downward with the increase of fluorine filling,lastly the valence band maximum converges to the highly degenerated secondary valence bands in fluorine-filled skutterudites.

关键词： valence Convergence bands

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The effect of room temperature magnetic field on photoluminescence of Mn:CsPbBr_(3) quantum dots prepared by one-pot method in air

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Nano Research 2025年第4期18卷 561-568页

作者： Mengwei Chen Chenguang Shen Wei Huang Yingping Yang Jie Shen Department of Physics School of Physics and MechanicsWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

The generation and manipulation of spin-polarized electrons at room temperature are essential for the development of advanced spin-optoelectronic *** this work,a one-pot method was used to successfully synthesize homogenous Mn:CsPbBr_(3) perovskite quantum dots in air with particle sizes of 7−8 *** effects of Mn doping on the structure,optical and magnetic properties of CsPbBr_(3) quantum dots were *** findings demonstrated proper Mn doping improved the crystallinity and photoluminescence(PL)of quantum *** prepared quantum dots have a narrow full width at half maximum emission(FWHM)of about 17−20 *** magnetic properties of the doped samples and the effect of the magnetic field on the PL spectra properties were *** results show that trace Mn doping can improve the room-temperature ferromagnetism of CsPbBr_(3) quantum *** with magnetic elements makes CsPbBr_(3) quantum dots more responsive to the applied magnetic *** at a lower 50 mT magnetic field,the PL peak of Mn:CsPbBr_(3) still declined 5.91%.Mn:CsPbBr_(3) quantum dots are a new type of multifunctional material that is beneficial to spintronics *** work demonstrates a low-cost synthesis *** should make all-inorganic perovskite quantum dots a promising material for room-temperature spin optoelectronic devices.

关键词： CsPbBr_(3)quantum dots Mn doping one-pot method ferromagnetism magnetic field

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Controllable photooxidation of 1-phenylethanol integrated with hydrogen evolution by a polyoxometalate/ZnIn_(2)S_(4)/WO_(3)catalytic system

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Nano Research 2025年第4期18卷 116-124页

作者： Jiaxin Yang Yongkang Liu Yun Qin Zhenheng Diao Yuanyuan Dong Hongjin Lv School of Chemical Engineering Advanced Institute of Materials ScienceChangchun University of TechnologyChangchun 130012China MOE Key Laboratory of Cluster Science Beijing Key Laboratory of Photoelectric/Electrophotonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 102488China

The photocatalytic oxidation of 1-phenylethanol coupling with hydrogen evolution represents a promising strategy for the full utilization of the photogenerated electrons and holes to accomplish the maximum conversion of solar energy into chemical *** date,however,the controllable of reaction path and product distribution has yet not to be ***,we report an efficient coupled catalytic system composed of ZnIn_(2)S_(4)/WO_(3)S-scheme heterojunction and Ni-containing polyoxometalate([Ni_(4)(H_(2)O)_(2)(PW_(9)O_(34))_(2)]^(10-)(Ni_(4)P_(2))),which exhibited excellent photocatalytic activities towards the oxidation valorization of 1-phenylethanol coupling with hydrogen *** addition of Ni_(4)P_(2)can efficiently control the product ***,1-phenylethanol was preferentially converted to pinacol(86.0% selectivity)via C-C coupling over ZnIn_(2)S_(4)/WO_(3)S-scheme heterojunction accompanied by hydrogen production(202.4μmol),whereas it would be converted to acetophenone(93.8% selectivity)by photogenerated holes with concomitant hydrogen formation(183.1μmol)over the coupled Ni_(4)P_(2)/ZnIn_(2)S_(4)/WO_(3) catalytic *** studies revealed that the hydrogen evolution cocatalyst Ni4P2,with its excellent electron storage capacity,can compete with the oxidation product acetophenone for electrons,and thus its addition can significantly inhibit the reduction of acetophenone,resulting in the inability to generate the coupling product pinacol.

关键词： S-scheme heterojunction ZnIn_(2)S_(4) polyoxometalates dehydrocoupling hydrogen evolution photocatalysis

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Probing the Néel Order in Altermagnetic RuO_(2) Films via X-Ray Magnetic Linear Dichroism

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Chinese Physics Letters 2025年第2期42卷 78-87页

作者： Yi-Chi Zhang Hua Bai Dong-Hui Zhang Chong Chen Lei Han Shi-Xuan Liang Rui-Yue Chu Jian-Kun Dai Maciek Sawicki Feng Pan Cheng Song Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(MOE)Dalian University of TechnologyDalian 116024China Institute of Physics Polish Academy of SciencesAleja Lotnikow 32/46PL-02668 WarsawPoland

The emerging altermagnetic RuO_(2)with both compensated magnetic moments and broken time-reversal symmetry possesses nontrivial magneto-electronic responses and nonrelativistic spin currents that are closely related to the magnetic easy *** M_(3)-edge X-ray magnetic linear dichroism(XMLD)measurements were performed to probe the Néel order in RuO_(2).For epitaxial RuO_(2) films,characteristic XMLD signals were observed for either RuO_(2)(100)or RuO_(2)(110)at normal incidence or RuO_(2)(001)at oblique *** signals disappeared when the test temperature exceeded the Néel *** non-epitaxial RuO_(2) films,the flat lines in the XMLD patterns of RuO_(2)(100)and RuO_(2)(110)demonstrate that there is no in-plane uniaxial alignment of the Néel order in these samples because of the counterbalanced Néel order of the twin crystals,as evidenced by X-ray diffraction phi-scan *** experimental results unambiguously demonstrate antiferromagnetism in RuO_(2) films and reveal the spatial relation of the Néel order parallel to the RuO_(2)[001]crystalline *** findings deepen the understanding of RuO_(2) and other attractive altermagnetic materials used in the field of spintronics.

关键词： temperature magnetic nontrivial

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Information limit of 15 picometers achieved with bright-field ptychography

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Physical Review B 2024年第6期110卷 L060104页

作者： Haozhi Sha Jizhe Cui Wenfeng Yang Rong Yu School of Materials Science and Engineering Tsinghua University Beijing 100084 China MOE Key Laboratory of Advanced Materials Tsinghua University Beijing 100084 China State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China

It is generally assumed that a high spatial resolution of a microscope requires a large numerical aperture of the imaging lens or detector. In this study, the information limit of 15 pm is achieved in transmission electron microscopy using only the bright-field disk (small numerical aperture) via multislice ptychography. The results indicate that high-frequency information has been encoded in the bright-field disk due to the multiple scattering of electrons in the objects, making it possible to break the diffraction limit of imaging via bright-field ptychography.

关键词： Convergent beam electron diffraction Crystal structures Electron diffraction Electron microscopy Scanning transmission electron microscopy

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Bifunctional hierarchical NiCoP@FeNi LDH nanosheet array electrocatalyst for industrial-scale high-current-density water splitting

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Journal of materials Science & technology 2023年第28期159卷 33-40页

作者： Liming Yang Tao Yang Enhui Wang Xiangtao Yu Kang Wang Zhentao Du Sheng Cao Kuo-Chih Chou Xinmei Hou Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China

Aiming to design and prepare non-noble metal electrocatalysts for hydrogen production at high current density(HCD),NiCoP@FeNi LDH hierarchical nanosheets were deposited on nickel foam progressively us-ing a hydrothermal-phosphorization-electrodeposition *** hydrogen evolution reaction(HER)and oxygen evolution reaction(OER),NiCoP@FeNi LDH/NF requires only 195 and 230 mV overpotentials to reach 1000 mA cm−2,*** overall water splitting,only 1.70 V is required at 1000 mA cm−*** is the largest value for non-noble metal-based electrocatalysts reported so far at *** hierarchi-cal structure exhibits good electron transport capability and the porous-macroporous structure enhances the gas release rate,resulting in enhanced hydrogen production at ***,the synergistic effect of NiCoP and FeNi LDH contributes to the adsorption-desorption equilibrium of intermediate radicals dur-ing the reaction process and ultimately enhances the catalytic *** work provides useful direction for industrial-scale hydrogen production applications at HCD.

关键词： High-current-density Overall water splitting Hydrogen evolution reaction Oxygen evolution reaction

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Photoexcitation-induced passivation of SnO2 thin film for efficient perovskite solar cells

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National Science Review 2023年第11期10卷 183-191页

作者： Nianyao Chai Xiangyu Chen Zhongle Zeng Ruohan Yu Yunfan Yue Bo Mai Jinsong Wu Liqiang Mai Yi-Bing Cheng Xuewen Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu Laboratory

A high-quality tin oxide electron transport layer(ETL) is a key common factor to achieve high-performance perovskite solar cells(PSCs). However, the conventional annealing technique to prepare high-quality ETLs by continuous heating under near-equilibrium conditions requires high temperatures and a long fabrication time. Alternatively, we present a non-equilibrium, photoexcitation-induced passivation technique that uses multiple ultrashort laser pulses. The ultrafast photoexcitation and following electron–electron and electron–phonon scattering processes induce ultrafast annealing to efficiently passivate surface and bulk defects, and improve the crystallinity of Sn O2, resulting in suppressing the carrier recombination and facilitating the charge transport between the ETL and perovskite interface. By rapidly scanning the laser beam, the annealing time is reduced to several minutes, which is much more efficient compared with conventional thermal annealing. To demonstrate the university and scalability of this technique, typical antisolvent and antisolvent-free processed hybrid organic–inorganic metal halide PSCs have been fabricated and achieved the power conversion efficiency(PCE) of 24.14% and 22.75% respectively, and a12-square-centimeter module antisolvent-free processed perovskite solar module achieves a PCE of 20.26%,with significantly enhanced performance both in PCE and stability. This study establishes a new approach towards the commercialization of efficient low-temperature manufacturing of PSCs.

关键词： photoexcitation-induced passivation ultrafast laser carrier management electron transport layer perovskite solar cells

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