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Carbon quantum dots modified TiO_(2) composites for hydrogen production and selective glucose photoreforming

Journal of Energy Chemistry 2022年第1期31卷 201-208,I0006页

作者： Heng Zhao Xinti Yu Chao-Fan Li Wenbei Yu Aiguo Wang Zhi-Yi Hu Steve Larter Yu Li Md Golam Kibria Jinguang Hu Department of Chemical and Petroleum Engineering University of Calgary2500 University DriveNWCalgaryAlberta T2N 1N4Canada State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Nanostructure Research Centre Wuhan University of Technology.Wuhan 430070Hubei.China Department of Geosciences University of Calgary2500 University DriveNWCalgaryAlberta T2N 1N4Canada

Lignocellulosic biomass photoreforming is a promising and alternative strategy for both sustainable H_(2) production and biomass valorization with infinite solar ***,harsh reaction conditions(high alkalinity or toxic organic solvents),with low biomass conversion and selectivity are often reported in *** this work,we report glucose photoreforming for coproduction of H_(2) and arabinose with improved selectivity under neutral condition using carbon quantum dots(CQDs)modified TiO_(2) *** show that the conventional CQDs fabricated by a facile one-step hydrothermal process could be endowed with novel color changing property,due to the particle aggregation under the regulation of incident *** as-fabricated CQDs/TiO_(2) composites with certain colored CQDs could greatly improve glucose to arabinose conversion selectivity(-75%)together with efficient hydrogen evolution(up to 2.43 mmolh^(-1)g^(-1))in *** arabinose is produced via the direct C1-C2 α-scissions mechanism with reactive oxygen species of·O_(2)^(-) and·OH,as evidenced by ^(13)C labeled glucose and the electron spin-resonance(ESR)studies,*** work not only sheds new lights on CQDs assisted photobiorefinery for biomass valorization and H_(2) coproduction,but also opens the door for rationale design of different colored CQDs and their potential applications for solar energy utilization in the noble-metal-free system.

关键词： CQDs Size regulation Hydrogen production Glucose photoreforming Arabinose

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Tuning the Oxygen Vacancies and Mass Transfer of Porous Conductive Ceramic Supported Irox Catalyst Via Polyether Derived Composite Oxide Pyrolysis: Toward a Highly Efficient Oxygen Evolution Reaction Catalyst for Water Electrolysis

SSRN

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SSRN 2023年

作者： Zhang, Hao Zhu, Liyan Shen, Yuhan Wu, Mingjuan Tian, Tian Tang, Haolin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China Hubei Key Laboratory of Fuel Cell Wuhan430070 China

Slow oxygen evolution reaction (OER) and material transport impedance in catalyst coated membrane (CCM) are major challenges for the practical proton exchange membrane water electrolyzer (PEMWE). Herein, we present a novel OER catalyst with a multilevel porous support and abundant oxygen vacancies to boost efficiency and durability in water electrolysis. The formation of a heterointerface with abundant oxygen vacancies in IrOx improves the catalytic activity and prevents IrOx from peroxidation. Furthermore, the unique pore structure of the support facilitates the mass transport of the anode catalyst layer during water electrolysis at high current density, and the material transport resistance of the water electrolyzer is only 0.0154 Ω cm2 at 1.5 A cm-2. When used in a PEMWE, the prepared electrocatalysts have an impressive electrochemical performance of 1.87 V at 3·A cm-2 with an Ir loading of only 0.91 mg cm-2. This approach highlights the importance of oxygen vacancies and transportation in the catalyst-support interface, providing a promising solution for high-rate practical water electrolysis. © 2023, The Authors. All rights reserved.

关键词： Mass transfer

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Reducing Cyclic Prefix Overhead Based on Symbol Repetition in NB-IoT-Based Maritime Communication

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China Communications 2022年第9期19卷 1-9页

作者： Tian Xiang Daiming Qu Faquan Zhang Dejin Kong School of Electronic and Electrical Engineering Wuhan Textile UniversityWuhan 430200China Sthe State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China School of Electronic Information and Communication Huazhong University of Science and TechnologyWuhan 430074China

With the increasing maritime activities,a great demand of wide-area maritime digital data services is ***,Narrowband Internet of Things(NB-IoT)that can provide wide coverage has been expected as an application for maritime communication networks(MCNS).In this paper,we aim to enhance the spectral efficiency in NB-IoT by reducing the cyclic prefix(CP)overhead in random access signal without causing *** key point of the proposed scheme is the symbols transmitted for multiple times repeatedly in ***,all CP are removed and multi-path fading effect is eliminated by using a repeated symbol to cover the disturbed symbol to construct a circular convolution structure of the channel with the same effect as adding *** addition,a single-tap equalization is still *** validate the effectiveness of the proposed scheme,simulation results are carried out with respect to the bit error ratio(BER).

关键词： NB-IoT narrowband physical random access channel cyclic prefix spectral efficiency

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The effect of Y3+ on microstructure and scintillation properties of hot-pressed Eu2+ doped CaF2 transparent ceramics

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Journal of Luminescence 2025年 286卷

作者： Zhou, Zhiwei Zhang, Pengshuai Chen, Guanyu Yuan, Dan Jing, Wentao Yang, Yu Jin, Qianqian Lan, Yuangang Mei, Bingchu School of Electronic Engineering Guangxi University of Science and Technology Liuzhou545006 China Guangxi Key Laboratory of Multidimensional Information Fusion for Intelligent Vehicles Guangxi University of Science and Technology Liuzhou545006 China Guangxi Colleges and Universities Key Laboratory of Microwave Communication and Micro–Nano Photoelectric Technology Guangxi University of Science and Technology Liuzhou545006 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

CaF2:Eu2+ transparent ceramics with and without Y3+ doping were fabricated by the hot-pressed sintering method under the inert atmosphere via the co-precipitation-synthesized nanoparticles. After the co-doping of Y3+, there was no significant change in the particle size of the nanoparticles, but the grain size of the ceramics was markedly reduced. The optical transmission of CaF2: Eu2+, Y3+ ceramics at 425 nm achieved approximately 46.3 %, surpassing that of CaF2:Eu2+ ceramics. With Y3+ ions co-doping, the photoluminescence (PL) and X-ray induced emission spectra displayed stronger emission bands at 422 nm ascribed to 5d-4f transitions of Eu2+ ions and weaker emission peaks at 550–650 nm range originating from 4f-4f transitions of Eu3+ ions in Eu2+:CaF2 ceramic. Furthermore, the effect of co-doped Y3+ ions on the scintillation decay lifetime, pulse height spectra, and thermoluminescence of the samples were investigated. © 2025

关键词： Scintillation

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Durable and Wearable Self-powered Temperature Sensor Based on Self-healing Thermoelectric Fiber by Coaxial Wet Spinning Strategy for Fire Safety of Firefighting Clothing

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advanced Fiber materials 2024年第5期6卷 1387-1401页

作者： Qing Jiang Yuhang Wan Yi Qin Xueru Qu Mi Zhou Siqi Huo Xiaochun Wang Zhicai Yu Hualing He State Key Laboratory of New Textile Materials and Advanced Processing Technologies Hubei Key Laboratory of Biomass Fibers and Eco-dyeing&FinishingSchool of Textile Science and EngineeringWuhan Textile UniversityWuhan 430200China Centre for Future Materials University of Southern QueenslandSpringfield Central 4300Australia School of Materials Design and Engineering Beijing Institute of Fashion TechnologyBeijing 100029China

Self-healable electronics with self-recoverable mechanical properties show a lot of potential in improving the reliability and durability of wearable electronic devices,but it is still ***,a self-healing core-sheath thermoelectric(TE)fiber-based temperature sensor was continuously fabricated by coaxial wet-spinning strategy,whose core layer and sheath layer are,respectively,pure Ti_(3)C_(2)T_(x)MXene and self-healing silk sericin(SS)/oxide sodium alginate(OSA)*** prepared SS/OSA@MXene core-sheath TE fiber exhibits accurate temperature-sensing at 200-400℃based on a linear relationship between TE voltage and temperature *** core-sheath TE fiber that can be integrated into firefighting clothing and timely alert firefighters to evacuate from the fire before the protective clothing becomes *** exposed to flames,SS/OSA@MXene can rapidly trigger a high-temperature warning voltage of 3.36 mV within 1.17 s and exhibit reversible high-temperature alarm *** addition,the fractured SS/OSA@MXene can restore up to 89.12%of its original strain limit at room temperature because of the robust yet reversible dynamic covalent bonds between SS and *** this study,an ingenious strategy for developing a durable and wearable TE fiber-based self-powered temperature sensor was *** strategy has promising application prospects in real-time temperature detection of firefighting clothing to ensure the safety of firefighters operating on a fire scene.

关键词： Core-sheath thermoelectric fiber Self-powered sensor High-temperature warning Self-healing Coaxial wet spinning

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Microstructure and elevated-temperature mechanical properties of dispersoid-strengthened Al-Mg-Si-Mn alloys produced by twin roll casting

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Progress in Natural Science:materials International 2021年第5期31卷 705-713页

作者： Yong Li Haiyao Wang Xiaoming Qian Zhaodong Wang Guangming Xu Jiadong Li State Key Laboratory of Rolling and Automation Northeastern University Guangxi Advanced Aluminum Processing Innovation Center Co.LTD National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University

The microstructure and elevated-temperature mechanical properties of dispersoid-strengthened Al-Mg-Si-Mn alloys produced by twin roll casting(TRC) and conventional mold casting(MC) were studied. A specific heat treatment at 430℃ for 6 h was applied, followed by rolling. Tensile tests were carried out at 300℃. The results show that in the as-cast microstructures, equiaxed grains formed in the MC sample while elongated grains with substructures formed in the TRC sample. The eutectics in the TRC sample were much finer than those in the MC sample. Upon heat treatment, large numbers of α-Al(Fe, Mn)Si dispersoids precipitated, and the TRC sample had a greater number density of dispersoids than those in the MC sample. During the tensile test after rolling, the TRC samples exhibited higher strength than the MC samples, which resulted from the combination of the strengthening effect of the stronger dispersoids and the greater substructure hardening effect in the TRC sample; the TRC sample exhibited better ductility due to its finer initial eutectic than that in the MC sample, which depressed the stress concentration and delayed the occurrence of microcracks and fracture in the TRC sample.

关键词： Aluminum alloy Twin-roll casting (TRC) alpha-Al(Fe Mn)Si dispersoids Elevated-temperature

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Engineering single atomic ruthenium on defective nickel vanadium layered double hydroxide for highly efficient hydrogen evolution

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Nano Research 2023年第4期16卷 4612-4619页

作者： Xiaoyu Chen Jiawei Wan Meng Zheng Jin Wang Qinghua Zhang Lin Gu Lirong Zheng Xianzhu Fu Ranbo Yu College of Materials Science and Engineering Shenzhen UniversityShenzhen 518071China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing InstitutionBeijing 100083China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Key Laboratory of Advanced Material Processing&Mold Ministry of EducationZhengzhou UniversityZhengzhou 450002China

Fabricating single-atom catalysts(SACs)with high catalytic activity as well as great stability is a big ***,we propose a precise synthesis strategy to stabilize single atomic ruthenium through regulating vanadium defects of nickel vanadium layered double hydroxides(NiV-LDH)ultrathin nanoribbons ***,the isolated atomically Ru doped NiV-LDH ultrathin nanoribbons(NiVRu-R)were successfully fabricated with a super-high Ru load of 12.8 wt.%.X-ray absorption spectrum(XAS)characterization further confirmed atomic dispersion of *** catalysts for electrocatalytic hydrogen evolution reaction(HER)in alkaline media,the NiVRu-R demonstrated superior catalytic properties to the commercial Pt/***,it maintained exceptional stability even after 5,000 cyclic voltammetry ***-situ XAS and density functional theory(DFT)calculations prove that the Ru atomic sites are stabilized on supports through forming the Ru-O-V structure,which also help promote the catalytic properties through reducing the energy barrier on atomic Ru catalytic sites.

关键词： hydrogen evolution reaction layered double hydroxide ruthenium atomic site ultrathin nanoribbons

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Study on Time-Domain Electromagnetic Response of Coal Seams During Spontaneous Combustion

Study on Time-Domain Electromagnetic Response of Coal Seams ...

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2023 International Applied Computational Electromagnetics Society Symposium, ACES-China 2023

作者： Cao, Le Yuan, Hao-Wei Wei, Yi-Wen Liu, Xu-Qing College of Electric and Control Engineering Xi'an University of Science and Technology Xi'an China School of Physics Xidian University Xi'an China Northwestern Polytechnical University Xi'an State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials China

ISBN: (纸本)9781733509657

In this paper, the temperature-frequency-electricity parameter relationship is firstly established, and then the reflection coefficient of the three-layer coal medium is calculated based on the generalized propagation matrix method, and then the variation of the reflected waves of the coal seam medium with the coal temperature is obtained by Fourier transform. The results show that the peak value of the reflected wave decreases first with temperature, then flattens out, and finally increases. The characteristic temperatures of different coal types in the process of spontaneous combustion are given in this paper, which provides a basis for the detection and early warning of coal spontaneous combustion. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Spontaneous combustion

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Interwoven scaffolded porous titanium oxide nanocubes/carbon nanotubes framework for high-performance sodium-ion battery

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Journal of Energy Chemistry 2021年第8期30卷 38-46,I0002页

作者： Wen-Bei Yu Wen-Da Dong Chao-Fan Li Nasiruddin Macadam Jiu-Xiang Yang Guo-Bin Zhang Zhi-Yi Hu Tien-Chun Wu Yu Li Tawfique Hasan Li-Hua Chen Li-Qiang Mai Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Cambridge Graphene Centre University of Cambridge9 JJ Thomson AvenueCB30FA CambridgeUnited Kingdom Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan 430070China Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de Bruxelles5000 NamurBelgium

Supercapacitor-like Na-ion batteries have attracted much attention due to the high energy density of batteries and power density of *** dioxide(TiO_(2)),is a promising anode *** performance is however seriously hindered by its low electrical conductivity and the sluggish diffusion of sodium ions(Na^(+))in the TiO_(2)***,this work combines porous TiO_(2)nanocubes with carbon nanotubes(CNTs)to enhance the electrical conductivity and accelerate Na^(+)diffusivity for Na-ion batteries(NIBs).In this composite,an interwoven scaffolded TiO_(2)/CNTs framework is formed to provide abundant channels and shorter diffusion pathways for electrons and *** in-situ X-ray diffraction and cyclic voltammetry confirm the low strain and superior transport kinetics in Na^(+)intercalation/extraction *** addition,the chemically bonded TiO_(2)/CNTs hybrid provides a more feasible channel for Na^(+)insertion/extraction with a much lower energy ***,the TiO_(2)/CNTs composite exhibits excellent electrochemical performance with a capacity of 223.4 m Ah g^(-1)at 1 C and a capacity of 142.8 m Ah g^(-1)at 10 C(3.35 A g^(-1)).The work here reveals that the combination of active materials with CNTs can largely improve the utilization efficiency and enhance their sodium storage.

关键词： Supercapacitor-like Interwoven scaffold Na-ion battery TiO_(2) Carbon nanotubes

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Zero-Valent Iron Supported by Dendritic Mesoporous Silica Nanoparticles to Purify Dye Wastewater

SSRN

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SSRN 2023年

作者： Chang, Baisong Dong, Kangfeng Wu, Shaolong Sun, Taolei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan430070 China

The presence of different types of organic dyes in water stream will clearly give rise to unexceptional side effects on living organisms. Emerging physical or chemical methods have been developed for the treatment of dye-involving water, but the exploration for adequate design strategy and technique available is still ongoing. Here, the zero-valent iron (ZVI) was prepared by a liquid phase sodium borohydride reduction approach and then integrated with dendritic mesoporous silica nanoparticle (DMSN) to construct the Janus magnetic adsorbent (denoted as ZVI-DMSN), which could be employed to purify dye wastewater. The structure, magnetic properties and dye adsorption results of ZVI-DMSN were systematically investigated. The ZVI component can enable efficient solid-liquid separation through magnetic separation route, and, more importantly, provided additional binding sites for adsorption process to increase the adsorption capacity. The thermodynamic analysis of adsorption indicated that the adsorption of typical organic dyes was an irreversible, spontaneous and endothermic process. Moreover, ZVI-DMSN adsorbent was recyclable, showing a regeneration efficiency of more than 80% after 5 cycles. We believe that ZVI-DMSN, as an inexpensive adsorbent material with excellent adsorption properties, e.g., short time, high efficiency and large capacity, will host vast potential for removal of dyes in water bodies. © 2023, The Authors. All rights reserved.

关键词： Wastewater treatment

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