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Nano Research 2017年第6期10卷 1888-1895页

作者： Shaofang Fu Chengzhou Zhu Junhua Song Mark H. Engelhard Xiaolin Li Peina Zhang Haibing Xia Dan Du Yuehe Lin School of Mechanical and Materials Engineering Washington State University WA 99164 USA Environmental Molecular Science Laboratory Pacific Northwest National Laboratory Richland WA 99354 USA Energy and Environmental Directory Pacific Northwest National Laboratory Richland WA 99354 USA State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

Heteroatom doping, precise composition control and rational morphology design are efficient strategies for producing novel nanocatalysts for the oxygen reduction reaction （ORR） in fuel cells. Herein, a cost-effective approach to synthesize nitrogen- and sulfur-codoped carbon nanowire aerogels using a hard templating method is proposed. The aerogels prepared using a combination of hydrothermal treatment and carbonization exhibit good catalytic activity for the ORR in alkaline solution. At the optimal annealing temperature and mass ratio between the nitrogen and sulfur precursors, the resultant aerogels show comparable electrocatalytic activity to that of a commercial Pt/C catalyst for the ORR. Importantly, the optimized catalyst shows much better long-term stability and satisfactory tolerance for the methanol crossover effect. These codoped aerogels are expected to have potential applications in fuel cells.

关键词： heteroatom-doped carbons porous nanomaterials aerogels metal-free catalysts oxygen reduction reaction

Nanocellulose-Assisted Construction of Multifunctional MXene-Based aerogels with Engineering Biomimetic Texture for Pressure Sensor and Compressible Electrode

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Nano-Micro Letters 2023年第7期15卷 122-135页

作者： Ting Xu Qun Song Kun Liu Huayu Liu Junjie Pan Wei Liu Lin Dai Meng Zhang Yaxuan Wang Chuanling Si Haishun Du Kai Zhang State Key Laboratory of Biobased Fiber Manufacturing Technology Tianjin Key Laboratory of Pulp and PaperTianjin University of Science and TechnologyTianjin 300457People’s Republic of China Sustainable Materials and Chemistry Department of Wood Technology and Wood-Based CompositesUniversity of Göttingen37077 GöttingenGermany Department of Chemical Engineering Auburn UniversityAuburnAL 36849USA State Key Laboratory of Bio-Based Materials and Green Papermaking Qilu University of Technology(Shandong Academy of Sciences)3501 Daxue RoadJinan 250353People’s Republic of China

Multifunctional architecture with intriguing structural design is highly desired for realizing the promising performances in wearable sensors and flexible energy storage *** nanofiber(CNF)is employed for assisting in building conductive,hyperelastic,and ultralight Ti_(3)C_(2)T_(x)MXene hybrid aerogels with oriented tracheid-like *** biomimetic hybrid aerogels are constructed by a facile bidirectional freezing strategy with CNF,carbon nanotube(CNT),and MXene based on synergistic electrostatic interaction and hydrogen *** CNF and CNT“mortars”bonded with MXene“bricks”of the tracheid structure produce good interfacial binding,and superior mechanical strength(up to 80%compressibility and extraordinary fatigue resistance of 1000 cycles at 50%strain).Benefiting from the biomimetic texture,CNF/CNT/MXene aerogel shows ultralow density of 7.48 mg cm^(-3)and excellent electrical conductivity(~2400 S m^(-1)).Used as pressure sensors,such aerogels exhibit appealing sensitivity performance with the linear sensitivity up to 817.3 kPa^(-1),which affords their application in monitoring body surface information and detecting human ***,the aerogels can also act as electrode materials of compressive solid-state supercapacitors that reveal satisfactory electrochemical performance(849.2 mF cm^(-2)at 0.8 mA cm^(-2))and superior long cycle compression performance(88%after 10,000 cycles at a compressive strain of 30%).

关键词： Nanocellulose aerogels MXene Supercapacitors Pressure sensors

Fabrication of layered structure VS4 anchor in 3D graphene aerogels as a new cathode material for lithium ion batteries

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Frontiers in Energy 2019年第3期13卷 597-602页

作者： Lijun WU Yu ZHANG Bingjiang LI Pengxiang WANG Lishuang FAN Naiqing ZHANG Kening SUN State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China School of Chemistry and Chemical Engineering Academy of Fundamental and Interdisciplinary SciencesHarbin Institute of TechnologyHarbin 150001China

VS4 has gained more and more attention for its high theoretical capacity (449 mAh/g with 3e^- transfer) in lithium ion batteries (LIBs). Herein, a layered structure VS4 anchored in graphene aerogels is prepared and first reported as cathode material for LIBs. VS4@GAs composite exhibits an exceptional high initial reversible capacity (511 mAh/g), an excellent high-rate capability (191 mAh/g at the 5 C), and an excellent cyclic stability (239 mAh/g after 15 cycles).

关键词： VS4 graphene aerogels cathode lithium storage

Modulating Pd e_(g) orbital occupancy in Pd-Au metallic aerogels for efficient carbon dioxide reduction

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Journal of Energy Chemistry 2023年第12期87卷 98-104,I0004页

作者： Yao Chen Juan Wang Tingjie Mao Cun Chen Hanjun Li Honggang Huang Hui Fu Feili Lai Jiadong Chen Nan Zhang Tianxi Liu Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringInternational Joint Research Laboratory for Nano Energy CompositesJiangnan UniversityWuxi 214122JiangsuChina Key Laboratory of Leather of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035ZhejiangChina Department of Chemistry KU LeuvenCelestijnenlaan 200FLeuven 3001Belgium

The electronic structure of electrocatalysts plays a critical role in energy conversion,whereas for an efficient catalyst,it is challenging to modulate the ***,we present a new strategy to modulate the e_(g) orbital occupancy of Pd by constructing composition-controllable Pd-Au metallic aerogels(MAs),optimizing the d-band center of Pd to achieve excellent performance for electrochemical carbon dioxide reduction reaction(CO_(2)RR).Specifically,Pd_(1)Au_(2) MAs achieve almost 100% Faraday efficiency(FE) of CO in the range of-0.40 to-0.80 V *** hydrogen electrode(RHE),as well as the long-term stability,being one of the best Pd-based materials for CO_(2)*** X-ray photoelectron spectroscopy(XPS) results and density functional theory(DFT) calculations demonstrate that the introduction of Au modulates the Pd e_(g) orbital occupancy,which significantly weakens *CO adsorption on Pd,reduces the CO_(2)RR energy barrier and consequently improves the electrocatalytic activity and stability for long-term *** work highlights a new strategy for designing efficient electrocatalysts for CO_(2)RR and beyond.

关键词： Pd Carbon dioxide reduction Alloy aerogels Orbital occupancy

Hydrophobic nanocellulose aerogels with high loading of metal-organic framework particles as floating and reusable oil absorbents

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Frontiers of Chemical Science and Engineering 2021年第5期15卷 1158-1168页

作者： Jiajia Li Shengcheng Zhai Weibing Wu Zhaoyang Xu Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forestry Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing210037China College of Light Industry and Food Engineering Nanjing Forestry UniversityNanjing210037China

In this paper,we employed a facile approach to prepare flexible and porous metal-organic frameworks(MOFs)containing cellulose nanofiber(CNF)aerogels(MNCAs)through freeze-drying MOF-containing cellulose nanofiber *** coating with methyltrimethoxysilane(MTMS)by chemical vapor deposition,recycled and hydrophobic MTMS-coated MNCAs(MMNCAs)were *** to the low density(0.009 g/cm^(3)),high porosity(97%)and good mechanical properties of the aerogel,the adsorption capacity of MMNCAs reached up to 210 g/g,which was nearly 3–5 times that of pure CNF *** prepared aerogels showed excellent oil/water selectivity and high capacity to adsorb oil and organic *** kind of cellulose-based aerogel may be applicable in the field of environmental protection.

关键词： cellulose nanofibers aerogels metal-organic framework oil-adsorption

Biopolymer-Based aerogels for Electromagnetic Wave Shielding and Absorbing

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Chinese Journal of Chemistry 2023年第3期41卷 322-334页

作者： Mingrui Han Runa Zhang Qilei Wu Na Wu Jiurong Liu Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education and School of Materials Science and EngineeringShandong UniversityJinanShandong250061 China Science and Technology on Electromagnetic Compatibility Laboratory China Ship Development and Design CentreWuhanHubei430064 China Department of Chemistry and Applied Biosciences ETH ZurichCH-8093 ZurichSwitzerland

The rapid development of communication technology and electronic industry has brought unprecedented serious electromagnetic interference(EMI)and electromagnetic wave(EMW)*** EMI shields and EMW absorbers based on metal or magnetic materials were used to solve these problems,they have long been criticized for their high price,high density and easy *** order to achieve low density and efficient dissipation of electromagnetic energy,aerogels stand out among manifold ***,constructing aerogels with good EMI shielding or EMW absorption performance and acceptable mechanical properties is not an easy *** biopolymers,such as cellulose,lignin,chitin/chitosan and alginate,breathe new life into aerogels for high-efficiency EMW shielding and ***,we reviewed the contributions of biopolymers in the fields of aerogels for EMW shielding and *** the same time,some challenges and outlook were also pointed out,aiming to promote the advance of aerogel-based EMI shields and EMW absorbers as well as the rational utilization of biopolymers.

关键词： Polymers Sustainable chemistry Electromagnetic interference(EMI)shielding Electromagnetic wave(EMW)absorbing Biomass aerogels Biopolymers

Intense Photoluminescence and Movement of Optical Absorption Edge in Alumina aerogels

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Journal of Materials Science & Technology 2000年第3期16卷 315-318页

作者： Xianting SUN, Lianzeng YAO, Chimei MO, Gang SHI, Weili CAI and Yimin ZHANG (Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China) Lide ZHANG (Institute of Solid State Physics, Chinese Academy Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China Department of Physics Teacher's College of Ping Ding Shan China

Alumina aerogels with high porosity of nanometer size were prepared from Al, n-butanol and ethyl acetoacetate by the sol-gel route and the N2 supercritical extraction drying technique. Optical experiment results showed that for alumina aerogels after annealing at 500℃ for 4 h one intense blue emission band appeared in the wavelength range of 400 to 800 nm, and the optical absorption edge moved from 8.0 eV of coarse grain Al203 to 3～eV and with increasing the annealing temperature, this luminescence band presented blue shifts. The reasons of these new optical properties are discussed in detail.

关键词： aerogels

Bifunctional Mo-doped FeCo–Se aerogels catalysts with excellent OER and ORR activities for electro-Fenton process

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Green Chemical Engineering 2023年第3期4卷 365-375页

作者： Fengjiang Chen Fan Yang Sai Che Hongchen Liu Chong Xu Neng Chen Yankun Sun Chunhui Yu Zhijie Wu Yongfeng Li State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China

Antibiotic pollution in aqueous solutions seriously endangers the natural environment and public *** this work,Mo-doped transition metal FeCo–Se metal aerogels(MAs)were investigated as bifunctional catalysts for the removal of sulfamethazine(SMT)in *** optimal Mo_(0.3)Fe_(1)Co_(3)–Se catalyst can remove 97.7% of SMT within 60 min(SMT content:10 mg/L,current intensity:10 mA/cm 2).The unique porous cross-linked structure of aerogel confered the catalyst sufficient active sites and efficient mass transfer *** the anode,Mo_(0.3)Fe_(1)Co_(3)–Se MAs exhibits superior oxygen evolution reaction(OER)property,with an overpotential of only 235 mV(10 mA/cm 2).Compared with Fe_(1)Co_(3) MAs or Mo_(0.3)Fe_(1)Co_(3) MAs,density functional theory(DFT)demonstrated that the better catalytic capacity of Mo_(0.3)Fe_(1)Co_(3)–Se MAs is attributed to the doping of Mo species and selenization lowers the energy barrier for the*OOH to O_(2) step in the OER *** OER perfor-mance ensures the self-oxygenation in this system,avoiding the addition of air or oxygen in the traditional electro-Fenton *** the cathode,Mo doping can lead to the lattice contraction and metallic character of CoSe_(2),which is beneficial to accelerate electron *** adjacent Co active sites effectively adsorb*OOH and inhibit the breakage of the O–O *** ring disk electrode(RRDE)test indicated that Mo_(0.3)Fe_(1)Co_(3)–Se MAs has an excellent 2e^(-)ORR activity with H_(2)O_(2) selectivity up to 88%,and the generated H_(2)O_(2) is activated by the adjacent Fe site through heterogeneous Fenton process to generate⋅OH.

关键词： Transition metal aerogels Electric Fenton 2e^(-)ORR

3D-printed aerogels as theranostic implants monitored by fluorescence bioimaging

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Bioactive Materials 2024年第11期41卷 471-484页

作者： Ana Iglesias-Mejuto Rui Pinto Pedro Faísca JoséCatarino João Rocha Luisa Durães Maria Manuela Gaspar Catarina Pinto Reis Carlos A.García-González aerogelsLab I+D Farma Group(GI-1645)Department of PharmacologyPharmacy and Pharmaceutical TechnologyFaculty of PharmacyiMATUS and Health Research Institute of Santiago de Compostela(IDIS)Universidade de Santiago de CompostelaE-15782Santiago de CompostelaSpain Research Institute for Medicines(iMed.ULisboa) Faculty of PharmacyUniversidade de LisboaAv.Professor Gama Pinto1649-003LisboaPortugal Joaquim Chaves Saúde Joaquim Chaves Laboratório de Análises ClínicasMiraflores1495069AlgésPortugal CECAV-Faculty of Veterinary Medicina-Lusófona University-Lisbon University Center Campo Grande 3761749-024LisboaPortugal Faculty of Veterinary Medicina-Lusófona University-Lisbon University Center Campo Grande 3761749-024LisboaPortugal University of Coimbra CERES-Chemical Engineering and Renewable Resources for SustainabilityDepartment of Chemical Engineering3030-790CoimbraPortugal Instituto de Biofísica e Engenharia Biomédica(IBEB) Faculdade de CiênciasUniversidade de LisboaCampo Grande1749-016LisboaPortugal

Aerogel scaffolds are nanostructured materials with beneficial properties for tissue engineering *** tracing of the state of the aerogels after their implantation is challenging due to their variable biodegradation rate and the lack of suitable strategies capable of in vivo monitoring the *** nanoparticles(UCNPs)have emerged as advanced tools for in vitro bioimaging because of their fluorescence *** this work,highly fluorescent UCNPs were loaded into aerogels to obtain theranostic implants for tissue engineering and bioimaging applications.3D-printed alginate-hydroxyapatite aerogels labeled with UCNPs were manufactured by 3D-printing and supercritical CO2 drying to generate personalize-to-patient *** physicochemical performance of the resulting structures was evaluated by printing fidelity measurements,nitrogen adsorption-desorption analysis,and different microscopies(confocal,transmission and scanning electron microscopies).Stability of the aerogels in terms of physicochemical properties was also tested after 3 years of *** was evaluated in vitro by different cell and hemocompatibility assays,in ovo and in vivo by safety and bioimaging studies using different murine *** profile,tissue index and histological evaluations of the main organs unveiled an in vivo downregulation of the inflammation after implantation of the ***-decorated aerogels were first-time manufactured and long-term traceable by fluorescence-based bioimaging until 3 weeks post-implantation,thereby endorsing their suitability as tissue engineering and theranostic nanodevices(*** implants).

关键词： Upconversion nanoparticles aerogels Theranostic implants In vivo fluorescence

CoFe_2O_4/carbon nanotube aerogels as high performance anodes for lithium ion batteries

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Green Energy & Environment 2017年第2期2卷 160-167页

作者： Xin Sun Xiaoyi Zhu Xianfeng Yang Jin Sun Yanzhi Xia Dongjiang Yang School of Environmental Science and Engineering Collaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong ProvinceCollege of Automation and Electrical Engineering Qingdao University Analytical and Testing Centre South China University of Technology Queensland Micro- and Nanotechnology Centre (QMNC) Griffith University

High-performance lithium ion batteries(LIBs) require electrode material to have an ideal electrode construction which provides fast ion transport, short solid-state ion diffusion, large surface area, and high electric conductivity. Herein, highly porous three-dimensional(3D)aerogels composed of cobalt ferrite(CoFe_2O_4, CFO) nanoparticles(NPs) and carbon nanotubes(CNTs) are prepared using sustainable alginate as the precursor. The key feature of this work is that by using the characteristic egg-box structure of the alginate, metal cations such as Co^(2+)and Fe^(3+) can be easily chelated via an ion-exchange process, thus binary CFO are expected to be prepared. In the hybrid aerogels, CFO NPs interconnected by the CNTs are embedded in carbon aerogel matrix, forming the 3D network which can provide high surface area, buffer the volume expansion and offer efficient ion and electron transport pathways for achieving high performance LIBs. The as-prepared hybrid aerogels with the optimum CNT content(20 wt%) delivers excellent electrochemical properties, i.e., reversible capacity of 1033 mAh g^(-1) at 0.1 A g^(-1) and a high specific capacity of 874 mAh g^(-1) after 160 cycles at 1 A g^(-1). This work provides a facile and low cost route to fabricate high performance anodes for LIBs.

关键词： Alginate aerogels Cobalt ferrite Anode Lithium-ion battery