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A new strategy to access Co/N co-doped carbon nanotubes as oxygen reduction reaction catalysts

Chinese Chemical Letters 2021年第1期32卷 535-538页

作者： Bingshuai Liu Huang Zhou Huihui Jin Jiawei Zhu Zhe Wang Chenxi Hu Lvhan Liang Shichun Mu Daping He State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Engineering Research Center of RF-Microwave Technology and Application Wuhan University of TechnologyWuhan 430070China

Carbon nanotubes(CNTs),as one-dimensional nanomaterials,show great potential in energy conversion and storage due to their efficient electrical conductivity and mass ***,the security risks,time-consuming and high cost of the preparation process hinder its further ***,we develop that a negative pressure rather than a following gas environment can promote the generation of cobalt and nitrogen co-doped CNTs(Co/N-CNTs) by using cobalt zeolitic imidazolate framework(ZIF-67) as a precursor,in which the negative pressure plays a key role in adjusting the size of cobalt nanoparticles and stimulating the rearragement of carbon atoms for forming ***,the obtained Co/N-CNTs,with high content of pyridinic nitrogen and abundant graphitized structure,exhibit superior catalytic activity for oxygen reduction reaction(ORR) with half-wave potential(E_(1/2)) of 0.85 V and durability in terms of the minimum current loss(2%) after the 30,000 s *** development provides a new pathway for large-scale and cost-effective preparation of metal-doped CNTs for various applications.

关键词： Negative pressure Cobalt zeolitic imidazolate framework Cobalt and nitrogen co-doped Carbon nanotubes Oxygen reduction reaction

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Pt and Te codoped ultrathin MoS_(2) nanosheets for enhanced hydrogen evolution reaction with wide pH range

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Rare Metals 2022年第2期41卷 378-384页

作者： Cui-Hua An Wei Kang Qi-Bo Deng Ning Hu National Engineering Research Center for Technological Innovation Method and Tool School of Mechanical EngineeringHebei University of TechnologyTianjin 300401China Key Laboratory of Advanced Energy Materials Chemistry(MOE) College of ChemistryNankai UniversityTianjin 300071China Institute for New Energy Materials&Low-Carbon Technologies School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of TechnologyTianjin 300130China

Transition metal dichalcogenides,especially MoS_(2),have been examined as promising catalysts for hydrogen evolution reaction(HER).Meanwhile,MoS_(2)with various nanostructures and exposed more active sites has been broadly explored for boosting the HER performances at wide pH ***,a synergistic Pt and Te codoping strategy has been used to enhance the catalytic performance(including reducing the overpotential and promoting the HER reaction kinetics)of ultrathin MoS_(2)nanosheets in alkaline and acid electrolytes,which has delivered better than single Pt doping or single Te doping.

关键词： doping kinetics synergistic

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B-Site Nanoscale-Ordered Structure Enables Ultra-High Tunable Performance

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Research 2023年第1期2022卷 413-426页

作者： Biaolin Peng Qiuping Lu Yi-Chi Wang Jing-Feng Li Qi Zhang Haitao Huang Laijun Liu Chao Li Limei Zheng Zhong Lin Wang ISchool of Advanced Materials and Nanotechnology Xidian UniversityXi'an 710126China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Basque Centre for Materials Applications and NanostructuresUPV/EHU Science ParkBarrio Sarriena s/n48940 LeioaSpain kerbasque Basque Foundation for SciencePlaza Euskadi5Bilbao 48009Spain Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong Kong Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guilin University of TechnologyGuilin 541004China Instrument Analysis Center Xi'an Jiaotong UniversityXi'an 710049China 'School of Physics Shandong UniversityJinan 250100China school of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332-0245USA

Tunable devices constructed by ferroelectric thin flms are often desired to possess a low dielectric loss while maintainging a high dielectric tunability over a broad operating temperature range in applications,for example,resonators,filters,or phase ***,it is dificult to simultaneously achieve these characteristics by traditional strategies,such as doping and strain ***,we demonstrate that the dielectric tunability of the sol-gel-prepared Pb(Sc_(1/2)Nb_(1/2))_(0.9)(Mg_(1/3)Nb_(2/3))_(0.O3)(PSNMN)thin film can be almost doubled from~47%to~80.0%(at 10kHz)at a low electric field(~530kV/cm),and the dielectric loss can be sharply reduced by more than an order of magnitude,from~0.50 to~0.037(at 1 kHz)when the thin flm was annealed in air at 650℃ for 15h under the help of an atmosphere-compensating-block(ACB)made from the proto-PSNMN ***,the PSNMN thin flm annealed with ACB also exhibited an extremely high thermally-stable dielectric tunability in an ultrabroad temperature range(>130 K),which could be attributed to the Maxwell-Wagner(MW)effect generated by the interface between the PSNMN disordered matrix and the B-site nanoscale-ordered structure formed during the long-term annealing *** reduced dielectric loss is mainly benefited from the reduced concentration of oxygen vacancy and the possibie MW efects,and the enhanced dielectric tunability could be ascribed to the weaker domain-pinning effect by oxygen *** breakthrough provides a new universal strategy to achieve utrahigh tunable performance in A(B'_(1/2)B"_(1/2))O3 ferroelectric thin films with a B-site nanoscale-ordered structure,meanwhile it paves the way for ultraintergrated tunable thin-flm-devices with great phase shifter performance in practical applications.

关键词： dielectric ferroelectric breakthrough

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Flexible,anti-damage,and non-contact sensing electronic skin implanted with MWCNT to block public pathogens contact infection

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Nano Research 2022年第3期15卷 2616-2625页

作者： Duan-Chao Wang Hou-Yong Yu Lurong Jiang Dongming Qi Xinxing Zhang Lumin Chen Wentao Lv Weiqiang Xu Kam Chiu Tam National Engineering Lab for Textile Fiber Materials&Processing Technology College of Textile Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018China College of Information Science and Technology Zhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan University Chengdu 610065China Department of Chemical Engineering Waterloo Institute for NanotechnologyUniversity of Waterloo200 University Avenue WestWaterlooOntario N2L 3G1Canada

If a person comes into contact with pathogens on public facilities,there is a threat of contact(skin/wound)*** urgently,there are also reports about COVID-19 coronavirus contact infection,which once again reminds that contact infection is a very easily overlooked disease exposure ***,we propose an innovative implantation strategy to fabricate a multi-walled carbon nanotube/polyvinyl alcohol(MWCNT/PVA,MCP)interpenetrating interface to achieve flexibility,anti-damage,and non-contact sensing electronic skin(E-skin).Interestingly,the MCP E-skin had a fascinating non-contact sensing function,which can respond to the finger approaching 0−20 mm through the spatial weak *** non-contact sensing can be applied urgently to human–machine interactions in public facilities to block *** scratches of the fruit knife did not damage the MCP E-skin,and can resist chemical corrosion after hydrophobic *** addition,the MCP E-skin was developed to real-time monitor the respiratory and cough for exercise detection and disease ***,the MCP E-skin has great potential for emergency applications in times of infectious disease pandemics.

关键词： prevent contact infection anti-damage sensors non-contact sensing respiratory sensing human–machine interaction

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A Congruent-Melting Rubidium Zinc Vanadium Oxychloride Exhibiting Strong Mid-Infrared Second-Harmonic Generation and High Laser-Induced Damage Threshold

SSRN

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SSRN 2024年

作者： Geng, Lei Li, Wenfei Meng, Changyu Lan, Youzhao Zhu, Baozhu Ma, Shihua Wu, Qi School of Physics and Physical Engineering Qufu Normal University Qufu273165 China Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology Department of Chemistry and Food Science Yulin Normal University Yulin537000 China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials Science Zhejiang Normal University Jinhua321004 China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China

A novel mid-infrared (MIR) nonlinear optical (NLO) crystal Rb4ZnV5O15Cl (RZVC) has been designed and sythesized by the aliovalent substitution strategy based on the parent structure Rb2(VO)(V2O7). Modification of square pyramidal VO5 units through introduction of chlorine ion and zinc metal caion significantly enhanced the dipole moments in a unit cell from 1.653 D for Rb2(VO)(V2O7) to 6.559 D for RZVC. As a consequence, polycrystalline RZVC exhibits strong SHG responses of 12.5 × KDP @1064 nm and 1.2 × AGS @2 μm. In addition, RZVC shows a deep IR transparency cutoff edge (10 μm), an ultra-high LIDT value (62 × AGS @1064 nm), and congruent melting property. Most importantly, RZVC can achieve full-wavelength phase matching in a very wide MIR transparency range of 1.69‒10 μm, completely covering the important atmospheric window (3‒5 μm) through NLO processes. All the comprehensively excellent properties make crystal RZVC can be a very attractive candidate for practical MIR NLO applications. © 2024, The Authors. All rights reserved.

关键词： Harmonic generation

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Growth of AgBr/Ag_(3)PO_(4) Heterojunction on Chitosan Fibers for Degrading Organic Pollutants

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advanced Fiber materials 2020年第5期2卷 246-255页

作者： Si-wei Xiong Yan Yu Pei Wang Man Liu Shao-hua Chen Xian-ze Yin Luo-xin Wang Hua Wang College of Materials Science and Engineering State Key Laboratory of New Textile Materials and Advanced Processing TechnologyWuhan Textile UniversityWuhan 430073People’s Republic of China Sichuan Textile Science Research Institute Chengdu 610072People’s Republic of China

Using Fiber as the based material for photocatalyst particles is favorable for their recovery,thereby avoiding the photocatalyst particles cause secondary pollution to water *** this work,the AgBr and Ag_(3)PO_(4) photocatalyst particles were loaded onto the surface of chitosan fiber(CF)via chelation and in situ anion-exchange *** photocatalytic results illustrated that the AgBr/Ag_(3)PO_(4)/CF composites displayed the best photocatalytic performance when the mass ratio of Ag_(3)PO_(4) and AgBr onto the CF was approximately 1:0.15,their degradation rate can reach 98.1%for the methyl orange(MO)solution,this value far exceeded those of pure CF,AgBr/CF composites,and Ag_(3)PO_(4)/CF ***,the AgBr/Ag_(3)PO_(4)/CF composites also shown excellent durability,after the fifth cycle,they still maintained a decolorization rate of 86.4%for the MO solution,while the Ag_(3)PO_(4)/CF composites maintained a decolorization rate of only 70.7%.Based on these results,we consider that the AgBr/Ag_(3)PO_(4)/CF composites have high practical interest in environmental remediation.

关键词： AgBr Ag_(3)PO_(4) Chitosan fiber Photocatalytic degradation

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A green route for hydrogen production from alkaline thermal treatment(ATT)of biomass with carbon storage

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Carbon Resources Conversion 2023年第4期6卷 298-314页

作者： Guojie Liu Zexue Du Houfang Lu Jianli Zeng Kejing Wu Bin Liang School of Chemical Engineering Sichuan UniversityChengdu 610065China Engineering Research Center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065China State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum ProcessingSINOPECBeijing 100083China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610207China

Hydrogen,a green energy carrier,is one of the most promising energy ***,it is currently mainly produced from depleting fossil fuels with high carbon emissions,which has serious negative effects on the economy and *** address this issue,sustainable hydrogen production from bio-energy with carbon capture and storage(HyBECCS)is an ideal technology to reduce global carbon emissions while meeting energy *** review presents an overview of the latest progress in alkaline thermal treatment(ATT)of biomass for hydrogen production with carbon storage,especially focusing on the technical characteristics and related challenges from an industrial application ***,the roles of alkali and catalyst in the ATT process are critically discussed,and several aspects that have great influences on the ATT process,such as biomass types,reaction parameters,and reactors,are ***,the potential solutions to the general challenges and obstacles to the future industrial-scale application of ATT of biomass for hydrogen production are proposed.

关键词： Hydrogen BECCS Negative carbon emission Alkaline thermal treatment(ATT) Biomass

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Tailoring Microstructure and Mechanical Property of Pure Tungsten Via Laser Powder Bed Fusion

SSRN

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SSRN 2023年

作者： Xiong, Zhengang Ma, Wenyou Deng, Zhaoyang Yu, Chunfeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Institute of New Materials Guangdong Academy of Sciences Guangzhou510650 China

Microstructure tailoring is a fascinating project for material scientists that enables the mechanical properties of metallic parts to be customized. In this study, a series of laser parameter settings were implemented to manufacture dense tungsten parts and three laser travelling strategies were developed to tailor the microstructure via laser powder bed fusion (LPBF). A novel brick-stacking structure and interlocked S-shaped grains were observed in these dense samples. Among different strategy tungsten builds, typical indentation size effect (ISE) was found based on the indentation responses. As-measured indentation hardness could be thought of the sum of contribution from surface and volume. Although their ISE was similar, the contribution from plastically volume work varied, which could be primarily interpreted by rotation strategy. The rotation strategy significantly reduced the grain size and thermal stress during laser manufacturing, resulting in higher true hardness (~ 3.5 GPa). Additionally, the compression properties and associated fracture behavior of tungsten specimens manufactured by the different strategies were also compared. Therefore, these findings show that controlling laser travelling strategy during the LPBF process could be a powerful avenue to tailor the microstructure and performance of the customized components. © 2023, The Authors. All rights reserved.

关键词： Hardness

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Large-scale data-driven and physics-based models offer insights into the relationships among the structures,dynamics,and functions of chromosomes

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Journal of Molecular Cell Biology 2023年第6期15卷 11-24页

作者： Cibo Feng Jin Wang Xiakun Chu Advanced Materials Thrust Function HubThe Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511400China Green e Materials Laboratory The Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511400China College of Physics Jilin UniversityChangchun 130012China Department of Chemistry and Physics The State University of New York at Stony BrookStony BrookNY 11794USA Division of Life Science The Hong Kong University of Science and TechnologyHong Kong SAR 999077China Guangzhou Municipal Key Laboratory of Materials Informatics The Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511400China

The organized three-dimensional chromosome architecture in the cell nucleus provides scaffolding for precise regulation of gene *** the cell changes its identity in the cell-fate decision-making process,extensive rearrangements of chromo-some structures occur accompanied by large-scale adaptations of gene expression,underscoring the importance of chromosome dynamics in shaping genome *** the last two decades,rapid development of experimental methods has provided unprecedented data to characterize the hierarchical structures and dynamic properties of *** parallel,these enormous data offer valuable opportunities for developing quantitative computational ***,we review a variety of large-scale polymer models developed to investigate the structures and dynamics of *** from the underlying modeling strategies,these approaches can be classified into data-driven(‘top-down’)and physics-based(‘bottom-up’)*** discuss their contributions to offering valuable insights into the relationships among the structures,dynamics,and functions of chromosomes and propose the perspective of developing data integration approaches from different experimental technologies and multidisciplinary theoretical/simulation methods combined with different modeling strategies.

关键词： 4D genome data-driven model physics-based model structure-function relationships cell-fate decision struc-tural changes chromosome dynamics

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在导电陶瓷基体中加入hBN薄片来创制材料性能的各向异性

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Science China materials 2023年第11期66卷 4317-4325页

作者：梁华岳邹冀刘晶晶顾熠涵季伟王子涵王为民傅正义 Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration ZoneXiangyang 441000China 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 Jingdezhen Huaxun Special Ceramics Co. Ltd.Jingdezhen 333000China

导电陶瓷的物理性能由连续的导电基体所决定,调控困难.在这项研究中,通过在陶瓷基体中引入hBN薄片,成功实现了导电陶瓷力学和物理性能各向异性的调控.以包含TiN、Al、硼和hBN的混合粉末为原料,通过放电等离子烧结制备了两种hBN含量不同... 详细信息

导电陶瓷的物理性能由连续的导电基体所决定,调控困难.在这项研究中,通过在陶瓷基体中引入hBN薄片,成功实现了导电陶瓷力学和物理性能各向异性的调控.以包含TiN、Al、硼和hBN的混合粉末为原料,通过放电等离子烧结制备了两种hBN含量不同的导电TiB_(2)-AlNhBN陶瓷.在垂直于烧结压力的方向上,TiB_(2)-AlN-60vol%hBN陶瓷在室温下的弯曲强度、断裂韧性、电导率和热导率分别为151±6.34MPa、2.62±0.31MPam^(1/2)、5.3×10^(5)S m^(−1)和77.87Wm^(-1)K^(-1).而在平行于烧结压力的方向上,室温电导率和热导率分别降低到2.0×10^(5)S m^(−1)和32.25Wm^(-1)K^(-1).这些差异是通过在导电基体中加入少量额外排列的hBN薄片而产生的,为材料选择和设计提供了新的机会.

关键词： hexagonal boron nitride texture microstructure mechanical property physical property

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