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Efficient microwave absorption achieved through in situ construction of core-shell Co Fe_(2)O_(4)@mesoporous carbon hollow spheres

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International Journal of Minerals,Metallurgy and Materials 2023年第3期30卷 504-514页

作者： Lianggui Ren Yiqun Wang Xin Zhang Qinchuan He Guanglei Wu College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059China Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China

Cobalt ferrite(CoFe_(2)O_(4)),with good chemical stability and magnetic loss,can be used to prepare composites with a unique structure and high *** this study,CoFe_(2)O_(4)@mesoporous carbon hollow spheres(MCHS)with a core-shell structure were prepared by introducing CoFe_(2)O_(4)magnetic particles into hollow mesoporous carbon through a simple in situ ***,the microwave absorption performance of the CoFe_(2)O_(4)@MCHS composites was *** and dielectric losses can be effectively coordinated by constructing the porous structure and adjusting the ratio of MCHS and CoFe_(2)O_(4).Results show that the impedance matching and absorption properties of the Co Fe_(2)O_(4)@MCHS composites can be altered by tweaking the mass ratio of MCHS and CoFe_(2)O_(4).The minimum reflection loss of the Co Fe_(2)O_(4)@MCHS composites reaches-29.7 dB at 5.8 *** addition,the effective absorption bandwidth is 3.7 GHz,with the thickness being 2.5 *** boosted microwave absorption can be ascribed to the porous core-shell structure and introduction of magnetic *** coordination between the microporous morphology and the core-shell structure is conducive to improving the attenuation coefficient and achieving good impedance *** porous core-shell structure provides large solid-void and CoFe_(2)O_(4)-C interfaces to induce interfacial polarization and extend the electromagnetic waves’multiple scattering and ***,natural resonance,exchange resonance,and eddy current loss work together for the magnetic *** method provides a practical solution to prepare core-shell structure microwave absorbents.

关键词： porous core-shell structure microwave absorption interface polarization ferrite structure-controllable

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Superior triethylamine-sensing properties based on SnO2 hollow nanospheres synthesized via one-step process

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Progress in Natural science:Materials International 2024年第4期34卷 682-689页

作者： Mingyue Xu Shu Yan Zia Ur Rehman Jianhua Hou Liangyun Zhai Shengjie Zhu Chuanbao Cao Wanfeng Xie Junyu Zhong Jun Yang State Key Laboratory of Bio-fibers and Eco-textiles School of Electronics and Information College of Materials Science and Engineering College of Chemistry and Chemical Engineering Qingdao University College of Environmental Science and Engineering Yangzhou University State Key Laboratory of Chemical Safety SINOPEC Research Institute of Safety Engineering Co. Ltd. National Registration Center for Chemicals Ministry of Emergency Management Research Center of Materials Science Beijing Institute of Technology State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences

Due to serious harm of triethylamine（TEA） to environmental safety and human health, it is significant to synthesize gas-sensitive materials with high performance for TEA detection. However, it is still a challenge to achieve high-sensitivity detection of TEA at low temperature for a sensor synthesized through an economical and efficient method. In this work, hollow-structured SnO2（HS-SnO2） nanospheres have been fabricated by a facile, low-cost hydrothermal method in one step, which exhibit superior TEA-sensing properties, including not only ultrahigh response（127.75） for 100 ppm TEA, good selectivity, but also fast response and recovery time（17/28 s）, low detection threshold（1 ppm） and robust stability at a relatively low optimum operational temperature of 225°*** excellent gas-sensitizing performances are ascribed to porous hollow structures with rich oxygen vacancies that provide abundant active sites for raising O2adsorption and reaction of TEA and oxygen species. This work offers an effective and economical strategy for fabricating high-performance TEA sensors for industrial applications.

关键词： Hollow-structured SnO2 nanospheres TEA High response Gas sensors

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Reversible-gel-assisted, ambient-pressure-dried,multifunctional, flame-retardant biomass aerogels with smart high-strength-elasticity transformation

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National science Review 2024年第11期11卷 203-214页

作者： Ting Wang Ying-Jiao Zhan Ming-Jun Chen Lei He Wen-Li An Shimei Xu Wei Wang Jian-Jun Shi Hai-Bo Zhao Yu-Zhong Wang College of Chemistry The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE)National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan)State Key Laboratory of Polymer Materials Engineering Sichuan University Green Preparation and Recycling Laboratory of Functional Polymeric Materials College of ScienceXihua University Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials& Processing Technology

Bio-based aerogels, which are poised as compelling thermal insulators, demand intricate synthesis procedures and have limited durability under harsh conditions. The integration of smart stimuli–response transitions in biomass aerogels holds promise as a solution, yet remains a challenge. Here, we introduce a pioneering strategy that employs reversible-gel-assisted ambient-pressure drying without organic solvents to craft multifunctional bio-based aerogels. By exploiting the thermally reversible gelling propensity of select biomasses, we anchor emulsified bubbles within cross-linked hydrogels, circumventing surface tension issues during mild drying. The resultant aerogels feature a robust porous matrix that is imbued with stable bubbles, yielding low thermal conductivity, high flame retardancy and robust resistance to diverse *** innovative approach facilitates a paradigm shift in intelligent fire protection in which aerogels transition from robust to flexible in response to water stimuli, effectively shielding against thermal hazards and external forces. This work opens up a facile, eco-friendly and mild way to fabricate advanced biomass aerogels with stimuli-responsive transformation.

关键词： biomass aerogel ambient-pressure drying flame retardance solvation-controlled elastification harsh-condition resistance

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Multi-level hollow sphere rich in heterojunctions with dual function:Efficient microwave absorption and antiseptic

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Journal of Materials science & technology 2024年第22期189卷 155-165页

作者： Liyuan Yu Di Lan Zhiqiang Guo Ailing Feng Guanglei Wu Zirui Jia Xing Feng Pengfei Yin College of Science Sichuan Agricultural UniversityYa’an 625014China School of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China Institute of Physics&Optoelectronics Technology Baoji University of Arts and SciencesBaoji 721016China

Effective electromagnetic wave absorption is now possible thanks to the design of the dielectric-magnetic double loss mechanism and the rich heterogeneous *** this study,hollow carbon spheres with rich heterostructures were synthesized using an easy and effective in situ growing *** addition to improving impedance matching,the hollow structure also reduces material density and *** modifying the load,this system can alter the dielectric characteristics of MXene,which in turn affects the sample’s ability to absorb electromagnetic *** and the carbon material create a thick conductive network during the whole electromagnetic wave absorption process,creating the ideal environment for conduction *** sample’s ability to attenuate electromagnetic waves is further improved by the interfacial polarization that the rich heterogeneous structure can ***-magnetic nanoparticle nanoparticles are the main source of magnetic *** MXene@Co/C-100–800(MCC-100–800)exhibits excellent electromagnetic wave absorption performance under the synergy of multiple loss mechanisms,with the maximum effective absorption bandwidth(EAB_(max))reaching 7.20 GHz and the minimum reflection loss(RL_(min))being–53.99 dB at 2.10 ***,this work is guided by the coating engineering of MXene and provides new ideas for the rational design of heterostructures of nanomaterials.

关键词： Heterostructure Dielectric-magnetic double loss MXene Hollow carbon sphere Electromagnetic wave absorption

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Controllable heterogeneous interfaces and dielectric modulation of biomass-derived nanosheet metal-sulfide complexes for high-performance electromagnetic wave absorption

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Journal of Materials science & technology 2024年第18期185卷 165-173页

作者： Zehua Zhou Di Lan Junwen Ren Yuhang Cheng Zirui Jia Guanglei Wu Pengfei Yin College of Science Sichuan Agricultural UniversityYa’an 625014China School of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China College of Electrical Engineering Sichuan UniversityChengdu 610065China

Constructing new environmentally friendly dielectric coupling models is an effective strategy for design-ing high-performance wave ***,biomass carbon materials with high potential energy and a lack of magnetic response mechanism do not fulfill the *** this work,the effects of different pyrolysis temperatures and the introduction of different metal sulfides on the microscopic morphology and dielectric-magnetic properties of the composites were *** them,K el-ement detected in the biomass effectively modulates the conduction *** minimum reflection loss(RL_(min))of-62.42 dB at 1.8 mm and the maximum effective absorption bandwidth(EAB_(max))of-62.42 dB at 1.9 mm were obtained due to the non-uniform interfacial-induced polarization of the metal-sulfide nanosheets and the scattering of the electromagnetic waves(EW)by the“island”*** study provides a powerful reference for the modification and application of biomass materials.

关键词： Biomass materials Metal sulfide Electromagnetic wave absorption Oxygen vacancy Interfacial polarization

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2D/2D Ti_(3)C_(2) MXene/HTiNbO_(5) nanosheets Schottky heterojunction for boosting photothermal-assisted solar-driven photodegradation of tetracycline hydrochloride

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Journal of Materials science & technology 2024年第13期180卷 193-206页

作者： Wen Xiao Huan Yu Chenghao Xu Zhongyi Pu Xiangyu Cheng Fang Yu Chao Liu Qinfang Zhang Zhigang Zou School of Materials Science and Engineering Yancheng Institute of TechnologyYancheng 224051China Jiangsu Provincial Key Laboratory of Eco-Environmental Materials Yancheng Institute of TechnologyYancheng 224051China Eco-Materials and Renewable Energy Research Centre(ERERC) Nanjing UniversityNanjing 210093China

Developing high-efficiency photocatalysts for tetracycline hydrochloride(TCH)degradation is of great sig-nificance to ecosystems and human *** this work,a two-step process of exfoliation and re-stacking was performed to prepare re-stacked HTiNbO_(5) nanosheets(R-HTNS)and then coupled with Ti_(3)C_(2) MXene to construct Ti_(3)C_(2) MXene/R-HTNS(MX/RTS)with a 2D/2D Schottky *** 2D/2D het-erostructures between Ti_(3)C_(2) MXene and R-HTNS can produce an internal electric field and provide max-imum interface area for efficient charge transfer across the intimate *** photocatalytic perfor-mance of samples was evaluated by TCH degradation under simulated *** MX/RTS composites,with an optimal sample of 3-MX/RTS,show enhanced photocatalytic activity for TCH degradation com-pared with *** characterization results reveal that the introduction of Ti_(3)C_(2) MXene can signif-icantly increase specific surface area for providing more reactive sites and broaden the light absorption ***,the incident light energy is absorbed by the Ti_(3)C_(2) MXene component in MX/RTS compos-ites to generate photothermal energy(heat),which facilitates the charge carrier separation and surface reaction ***,the enhanced TCH photodegradation activity for MX/RTS composites is due to the introduction of Ti_(3)C_(2) MXene,which possesses the synergistic effect of the increased specific surface area,improved light-harvesting capacity,2D/2D Schottky heterojunction,and photothermal energy ***,the TCH photodegradation behavior is deliberated with a detailed discussion on various co-existing *** TCH photodegradation,the active radical species are determined for 3-MX/***-cording to the characterization results,the possible TCH photodegradation pathway and mechanism over 3-MX/RTS are *** work may offer a novel insight for constructing MXene-based heterostruc-tured photocatalysts with high efficiency.

关键词： HTiNbO_(5) Ti_(3)C_(2)MXene Schottky heterojunction Photodegradation Phototherma

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Acidic electroreduction CO_(2)to formic acid via interfacial modification of Bi nanoparticles at industrial-level current

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Nano Research 2024年第7期17卷 5817-5825页

作者： Tian Dong Hongdong Li Zhenhui Wang Yanling Geng Rui Chang Xiaofeng Tian Jianping Lai Shouhua Feng Lei Wang Key Laboratory of Eco-Chemical Engineering International Science and Technology Cooperation Base of Eco-Chemical Engineering and Green ManufacturingCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042China

Electrocatalytic CO_(2)reduction reaction(CO_(2)RR)in acidic media is a promising approach to overcome the unavoidable formation of carbonates in alkaline or neutral ***,the proton-rich environment near the catalyst surface favors hydrogen evolution reactions(HER),leading to lower energy efficiency of the desired products,especially in industrial-level current ***,quaternary ammonium cationic surfactant(cetyltrimethylammonium bromide(CTAB))was introduced into acidic electrolyte to modulate the interfacial microenvironment,which greatly enhanced CO_(2)electroreduction to formic acid(HCOOH)at the Bi/C nanoparticles *** a Bi/C nanoparticles electrode with CTAB added,constant production of formic acid was enabled with a cathodic energy efficiency of>40%and maximum FE_(HCOOH)(FE=Faradaic efficiency)of 86.2%at−400 mA·cm^(−2)over 24 *** with in-situ attenuated total reflection Fourier transform infrared spectroscopy,the concentration of*OCHO intermediates significantly increased after CTAB modification,confirming that the hydrophobic interface microenvironment formed by dynamic adsorption of positively charged long alkyl chains on Bi/C nanoparticle electrodes inhibited HER and improved the selectivity of CO_(2)RR to HCOOH.

关键词： acidic media CO_(2)electrolysis electrolyte additive hydrophobic interfacial microenvironment industrial-level current

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MOF-templated tubular Ni_(1−x)Co_(x)S_(2)-CdS heterojunction with intensified direct Z-scheme charge transmission for highly promoted visible-light photocatalysis

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Nano Research 2024年第7期17卷 6281-6293页

作者： Chuan Jiang Yuanxin Qiu Xinxin Xin Yanyan Li Huilin Li Hui Wang Jixiang Xu Haifeng Lin Lei Wang Volodymyr Turkevych Key Laboratory of Eco-chemical Engineering International S&T Cooperation Foundation of Eco-chemical Engineering and Green ManufactureCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization Key Laboratory of Rubber-Plastics of Ministry of EducationSchool of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao 266042China V.Bakul Institute for Superhard Materials National Academy of Sciences of UkraineKyiv 04074Ukraine

Hollow semiconductor nanostructures with direct Z-scheme heterojunction have significant advantages for photocatalytic reactions,and optimizing the interfacial charge transmission of Z-scheme heterojunction is the hinge to achieve excellent solar conversion *** this work,tubular Ni_(1−x)Co_(x)S_(2)-CdS heterostructures with reinforced Z-scheme charge transmission were constructed through an In-metal-organic framework(MOF)templated *** Z-scheme charge transfer mechanism was sufficiently confirmed by combining density functional theory(DFT)calculation,X-ray photoelectron spectroscopy(XPS),surface photovoltage spectroscopy(SPV),and radical testing ***,the use of sodium citrate complexant contributes to the formation of intimate heterointerface,and the Fermi level gap between CdS and NiS_(2)is enlarged through Co doping into NiS_(2),which enhances the built-in electric field and photo-carriers transmission driving force for Ni_(1−x)Co_(x)S_(2)-CdS heterojunction,resulting in an evidently promoted activity toward H2 evolution reaction(HER).Under visible-light(λ>400 nm)irradiation,the Ni_(1−x)Co_(x)S_(2)-CdS composite with 10 mol%Co doping and 80 wt.%CdS(NC_(0.10)S-80%CdS)achieved an outstanding HER rate up to 35.94 mmol·g^(−1)·h^(−1)(corresponding to the apparent quantum efficiency of 34.7%at 420 nm),approximately 76.4 times that of 3 wt.%Pt-loaded CdS and it is much superior to that of most CdS-based photocatalysts ever ***,the good photocatalytic durability of Ni_(1−x)Co_(x)S_(2)-CdS heterostructures was validated by cycling and long-term HER *** work could inspire the development of high-performance Z-scheme heterojunction via optimizing the morphology and interfacial charge transmission.

关键词： tubular heterostructure Z-scheme charge transmission interfacial coupling built-in electric field visible-light photocatalysis

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Environmental characteristics of trace metals in seawater from the Ninety East Ridge in the Indian Ocean

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Journal of Oceanology and Limnology 2024年第4期42卷 1119-1129页

作者： Jingxi LI Di ZHANG Fenghua JIANG Hong CHEN Wei CAO Chengjun SUN Key Laboratory of Marine Eco-Environmental Science and Technology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Laoshan Laboratory of Marine Science and Technology Laboratory of Marine Drugs and Biological ProductsQingdao 266071China

The Ninety East Ridge in the Indian Ocean has complex and unique *** concentrations and distribution characteristics of 10 trace metals(V,Cr,Mn,Fe,Co,Ni,Cu,Cd,Pb,and U)in seawater from the Ninety East Ridge in the Indian Ocean were *** show that the average concentrations of different trace metals in all the collected seawater samples were 1.134μg/L for V,0.158μg/L for Cr,0.489μg/L for Mn,0.427μg/L for Fe,0.011μg/L for Co,0.395μg/L for Ni,0.403μg/L for Cu,0.097μg/L for Cd,0.139μg/L for Pb,and 3.470μg/L for *** in the horizontal and vertical distributions of all measured trace metals were revealed,and the occurrence of high concentrations was *** addition,the significant differences in the concentration distribution of different trace metals in seawater on both sides of the Ninety East Ridge present regional segmentation in the area for various trace metals in deep sea *** study provided basic data for future investigations on the environmental and ecological impact of trace metals in the Indian Ocean and the potential water mass transport mechanism.

关键词： trace metal environmental characteristic Ninety East Ridge seawater Indian Ocean

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Spatial conﬁnement of zeolitic imidazolate framework deposits by porous carbon nanospheres for dual-atom catalyst towards high-performance oxygen reduction reaction

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Nano Research 2023年第8期16卷 11464-11472页

作者： Jiayi Zhao Ping Li Kaicai Fan Wenjie Wei Fenghong Lu Huimin Zhao Bin Li Lingbo Zong Lei Wang Key Laboratory of Eco-chemical Engineering College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China

Dual atom catalysts(DACs),are promising electrocatalysts for oxygen reduction reaction(ORR)on account of the potential dual-atom active sites for the optimized adsorption of catalytic intermediates and the lower reaction energy ***,spatial conﬁnement strategy to fabricate DACs with well-defined Fe,Co dual-atom active site is proposed by implanting zeolitic imidazolate frameworks inside the pores of highly porous carbon nanospheres(Fe/Co-SAs-Nx-PCNSs).The atomically dispersed dual-atom active sites facilitate the adsorption/desorption of ***,the spatial conﬁnement effect protects metal atoms *** from the rich accessible dual-atom active sites and boosted mass transport,we achieve remarkable ORR performance with half-wave potential up to 0.91 and 0.8 V(*** hydrogen electrode(RHE)),and long-term stability up to 10 h in both alkaline and acidic *** remarkably enhanced ORR catalytic property of our as-developed DACs is in the rank of excellence for 1%.The as-developed rechargeable Zn-air battery(ZAB)with Fe/Co-SAs-Nx-PCNSs air cathode delivers ultrahigh power density of 216 mW·cm^(−2),outstanding specific capacity of 813 mAh·g^(−1),and promising cycling operation durability over 160 *** flexible Zn-air battery also exhibits excellent specific capacity,cycling stability,and flexibility *** work opens up a new pathway for the multiscale design of efficient electrocatalysts with atomically dispersed multiple active sites.

关键词： spatial confinement zeolitic imidazolate framework porous carbon nanospheres(PCNSs) dual-atom catalyst oxygen reduction reaction(ORR)

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