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Rational design of CO_(2)electroreduction cathode via in situ electrochemical phase transition

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Journal of Energy Chemistry 2022年第3期31卷 603-611,I0016页

作者： Shiqing Hu Huan Li Xue Dong Zhongwei Cao Bingjie Pang Liming Zhang Wenguang Yu Jianping Xiao Xuefeng Zhu Weishen Yang State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023LiaoningChina

CO_(2)electroreduction reaction(CO_(2)RR),combined with solid oxide electrolysis cells(SOECs),is a feasible technology for the storage of renewable electric energy,while its development is limited by the catalytic activity and stability on ***,a novel garnet oxide(Gd_(3)Fe_(5)O_(12))cathode is designed,where the garnet oxide is converted to perovskite oxide and iron via in situ electrochemical phase transition during CO_(2)electroreduction,resulting in high activity with Faradaic efficiency close to 100%and great stability over 1000 h galvanostatic test.A variety of experimental characterizations and density functional theory calculations indicate that in situ exsolved Fe clusters can effectively enhance the adsorption energies of intermediates and lowering the CO_(2)dissociation *** modelling confirms that CO_(2)RR goes through a dissociative adsorption mechanism and the electronic transfer for CO_(2)dissociation is the rate-determining step.

关键词： Carbon dioxide electroreduction Electrochemical phase transition Garnet oxides Perovskite oxides iron nanoparticles

Precipitation of hematite nanoparticles via reverse microemulsion process

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Journal of Natural Gas Chemistry 2011年第6期20卷 687-692页

作者： Mohammad Reza Housaindokht Ali Nakhaei Pour Bimolecular Research Center Department of ChemistryFerdowsi University of MashhadP.O.Box:91775-1436MashhadIran

Hematite nanoparticles have been successfully synthesized via two processing routes：（i） conventional precipitation route and （ii） reverse microemulsion *** particle precipitation was carried out in a semibatch reactor.A microemulsion system consisting of water,chloroform,1-butanol and surfactant was loaded with iron nitrates to form iron nanoparticles *** precipitation was performed in the single-phase microemulsion operating *** technical surfactants,with different structure and HLB value are *** influence of surfactant characterization on the size of produced iron oxide particle has been studied to gain a deeper understanding of the important controlling mechanisms in the formation of nanoparticles in a *** electron microscopy （TEM）,surface area,pore volume,average pore diameter,pore size distribution and XRD were used to analyze the size,size distribution,shape and structure of precipitated iron nanoparticles.

关键词： iron nanoparticles microemulsion hematite

Laser generation of iron-doped silver nanotruffles with magnetic and plasmonic properties

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Nano Research 2015年第12期8卷 4007-4023页

作者： Vincenzo Amendola Stefano Scaramuzza Stefano Agnoli Gaetano Granozzi Moreno Meneghetti Giulio Campo Valentina Bonanni Francesco Pineider Claudio Sangregorio Paolo Ghigna Stefano Polizzi Piero Riello Stefania Fiameni Luca Nodari Department of Chemical Sciences Universita di Padova Padova 1-35131 Italy Department of Chemistry University of Florence & INSTM Florence 1-50019 Italy ICCOM-CNR Sesto Fiorentino Florence 1-50019 Italy Department of Chemistry Universitta di Pavia Pavia 1-27100 Italy Department of Molecular Sciences and Nanosystems Universita Ca' Foscari Venezia and INSTM UdR Venezia Venezia-Mestre 1-30172 Italy CNR - IENI Padova 1-35127 Italy

A frontier topic in nanotechnology is the realization of multifunctional nanoparticles （NPs） via the appropriate combination of different elements of the periodic table. The coexistence of Fe and Ag in the same nanostructure, for instance, is interesting for nanophotonics, nanomedicine, and catalysis. However, alloying of Fe and Ag is inhibited for thermodynamic reasons. Here, we describe the synthesis of Fe-doped Ag NPs via laser ablation in liquid solution, bypassing thermodynamics constraints. These NPs have an innovative structure consisting of a scaffold of face-centered cubic metal Ag alternating with disordered Ag-Fe alloy domains, all arranged in a truffle-like morphology. The Fe-Ag NPs exhibit the plasmonic properties of Ag and the magnetic response of Fe-containing phases, and the surface of the Fe-Ag NPs can be functionalized in one step with thiolated molecules. Taking advantage of the multiple properties of Fe-Ag NPs, the magnetophoretic amplification of plasmonic properties is demonstrated with proof-of-concept surface-enhanced Raman scattering and photothermal heating experiments. The synthetic approach is of general applicability and virtually permits the preparation of a large variety of multi-element NPs in one step.

关键词： silver nanotruffles iron nanoparticles laser ablation laser ablation synthesis in solution(LASiS) nanoalloys

Optimizing synthesis conditions of nanoscale zero-valent iron （nZVI） through aqueous reactivity assessment

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Frontiers of Environmental Science & Engineering 2015年第5期9卷 813-822页

作者： Yanlai HAN Michael D. Y. YANG Weixian ZHANG Weile YAN Department of Civil and Environmental Engineering Texas Tech University Lubbock TX 79409 USA State Key Laboratory for Pollution Control & Resources Reuse Tongji University Shanghai 200092 China

Nanoscale iron particles （nZVI） is one of the most important engineered nanomaterials applied to environmental pollution control and abatement. Although a multitude of synthesis approaches have been proposed, a facile method to screen the reactivity of candidate nZVI materials produced using different methods or under varying synthesis conditions has yet been established. In this study, four reaction parameters were adjusted in the preparation of borohydride-reduced nZVI. The reductive properties of the resultant nanoparticles were assayed independently using two model aqueous contaminants, Cu （II） and nitrate. The results confirm that the reductive reactivity of nZVI is most sensitive to the initial concentration of iron precursor, borohydride feed rate, and the loading ratio of borohydride to ferric ion during particle synthesis. Solution mixing speed, in contrast, carries a relative small weight on the reactivity of nZVI. The two probing reactions （i.e., Cu（II） and nitrate reduction） are able to generate consistent and quantitative inference about the mass-normalized surface activity of nZVI. However, the nitrate assay is valid in dilute aqueous solutions only （50 mg.L~ or lower） due to accelerated deactivation of iron surface at elevated nitrate concentra- tions. Additional insights including the structural and chemical makeup of nZVI can be garnered from Cu（II） reduction assessments. The reactivity assays investigated in this study can facilitate screening of candidate materials or optimization of nZVI production parameters, which complement some of the more sophisticated but less chemically specific material characterization methods used in the nZVI research.

关键词： iron nanoparticles nanoscale iron particles(nZVI) synthesis characterization Cu(II) reduction nitratereduction

Biomineralized and chemically synthesized magnetic nanoparticles:A contrast

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Frontiers of Materials Science 2020年第4期14卷 387-401页

作者： Tanya NANDA Ankita RATHORE Deepika SHARMA Present adress:School of Biological and Health Systems Engineering Ira A.Fulton Schools of EngineeringArizona State UniversityTempeAZ 85281USA Present address:Academy of Scientific and Innovative Research(AcSir) CSIR-National Institute of Science Communication and Information Resources(NISCAIR)New Delhi 110067India Institute of Nano Science and Technology Habitat CentreSector 64Mohali 160062India

Magnetic nanoparticles(MNPS)have widely been synthesized through chemical processes for biomedical applications over the past few ***,a new class of MNPs,known as bacterial magnetosomes,has been isolated from magnetotactic bacteria,a natural *** magnetosomes are magnetite or greigite nanocrystals which are biomineralized in the bacterial cell and provide magnet-like properties to *** to MNPs,bacterial magnetosomes are biocompatible,lower in toxicity,and can be easily cleared from the body due to the presence of a phospholipid bilayer around *** also do not demonstrate aggregation,which makes them highly *** this review,we have provided an in-depth comparative account of bacterial magnetosomes and chemically synthesized MNPs in terms of their synthesis,properties,and biomedical *** addition,we have also provided a contrast on how magnetosomes might have the potential to successfully substitute synthetic MNPs in therapeutic and imaging applications.

关键词： bacterial magnetosomes magnetic nanoparticles iron nanoparticles magnetotactic bacteria magnetosomes

Fe nanoparticles Synthesized by Pomegranate Leaves for Treatment of Malachite Green

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Journal of Wuhan University of Technology(Materials Science) 2022年第3期37卷 350-354页

作者： HU Yu ZHOU Shiyu PAN Xiaobin ZHOU Fan SUN Yong LIU Meiqun ZHANG Dong ZHANG Lingfan Department of Chemistry and Environmental Engineering Hanjiang Normal UniversityShiyan 442000China Shiyan Hydrological and Water Resources Survey Bureau of Hubei Province Shiyan 442000China School of Chemistry and Molecular Engineering East China University of Science and TechnologyShanghai 200237China

A green and convenient pathway of preparing iron nanoparticles(FeNPs)with pomegranate leaf(PG)extract for highly effective removal of malachite green(MG)was proposed under ambient *** materials were characterized by scanning electron microscope(SEM),X-ray energy-dispersive spectrometer(EDS),Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)*** results show that their surfaces are capped and stabilized by PG extract with amorphous nature and without any detection of zero-valent *** size and surface valence state of FeNPs are the key factors that affect the MG removal *** the reagent volume ratio of PG extract to FeCl_(3) increases greater than 1,the cross-linked FeNPs become more obvious,having a homogeneous distribution with the size range from 30 to 40 nm,and show an increasing ratio ofFe(Ⅱ)/Fe(Ⅲ),which is in proportion to the degradation efficiency of MG,reaching higher than 95%in only 2 min by using 50 mg Fe/L FeNPs and 200 mg/L MG.

关键词： green synthesis iron nanoparticles pomegranate leaf extract malachite green

Synthesis of nanoiron by microemulsion with Span/Tween as mixed surfactants for reduction of nitrate in water

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Frontiers of Environmental Science & Engineering 2007年第4期1卷 466-470页

作者： ZHANG Yunxia LI Tielong JIN Zhaohui WANG Wei WANG Shuaima College of Environmental Science and Engineering Nankai UniversityTianjin 300071China

Denitrification of nitrate in groundwater using iron nanoparticles has received increasing interest in recent *** order to fabricate iron nanoparticles with homoge-neously spherical shape and narrow size distribution,a simple and“green”method was developed to synthesize iron *** conventional microemulsion methods were modified by applying Span 80 and Tween 60 as mixed *** maximum content of water in the Water-in-oil(W/O)microemulsion and its appropriate forming conditions were found,and then the microemulsion system consisting of saturated Fe^(2+)solution was used to synthesizeα-Fe ultrafine particles by redox *** nanoparticles were characterized by using powder X-ray diffraction(XRD)and transmission electron microscopy(TEM).The results show that the average diameter of the particle is about 80-90 *** chemical activity of the obtained iron nanoparticles was studied by the denitrification experiment of *** results show that under the experimental conditions,iron removed most of the 80 mg/L nitrate within 30 *** mass balance of nitrate reduction with nanoscale Fe indicates that endproducts are mainly *** possible reaction pathways for nitrate reduction by nanoscale iron particles have been proposed in this work.

关键词： mixed surfactants microemulsion iron nanoparticles nitrate