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Simultaneous Raman and reflection Uv/vis absorption spectroelectrochemistry

nano Research 2022年第6期15卷 5340-5346页

作者： Sheila Hernandez juan v.Perales-Rondon Aranzazu Heras Alvaro Colina Department of Chemistry Universidad de BurgosPza.Misael Banuelos s/ñBurgos E-09001Spain Department of Analytical Chemistry Physical Chemistry and Chemical EngineeringUniversity of Alcala.Ctra.Madrid-BarcelonaKm.33.600MadridAlcaláde Henares E-28871Spain

In the present work,a new combination of Raman and ultraviolet and visible(Uv/vis)absorption spectroelectrochemistry in reflection mode is *** new experimental setup allows obtaining the two kinds of spectroscopic data without interferences concomitantly with the electrochemical *** the best of our knowledge,it is the first time to report the simultaneous obtention of electrochemical,electronic,and vibrational information in the same *** new combination provides time-resolved information about the processes that are taking place on the electrode/solution interface which has significant implications in different fields of chemistry,such as modification of electrodes,studies of electrocatalytic reaction mechanisms,development of sensors,among *** different systems were used to demonstrate the advantages and capabilities of the brand.new technique,namely,the oxidation of potassium ferrocyanide,an out-sphere system that is usually employed in the validation of SEC techniques,and the electrochemical-surface enhanced Raman spectroscopy(EC-SERS)detection of crystal violet by in-situ formation of the silver SERS substrate,where the Uv/vis spectra were used to follow the formation of the SERS substrate,whereas the Raman response of a probe molecule was used to confirm either the formation of a nanostructured surface and to obtain the fingerprint of the molecule with a high time *** brand.new experimental setup has shown to be useful,versatile,robust,compact,and easy to use for future applications.

关键词： spectroelectrochemistry surface enhanced Raman spectroscopy(SERS) Raman ultraviolet and visible(Uv/vis)absorption nanoparticles

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Synergistic O^(2-)/Li^(+) Dual Ion Transportation at Atomic Scale

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Research 2019年第1期2019卷 1260-1267页

作者： F.Q.Meng Q.H.Zhang A.Gao X.Z.Liu j.n.Zhang S.Y.Peng X.Lu L.Gu H.Li Beijing national Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Materials Sun Yat-Sen UniversityGuangzhou 510275China College of Materials Science and Engineering Jiangxi University of Science and TechnologyJiangxi 341000China Songshan Lake Materials Laboratory DongguanGuangdong 523808China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

Te ion migration during electrochemical process is a fundamental scientifc issue for phase transition behavior and of technical importance for various functional devices,where cations or anions are active under electrical *** only one type of functional ion,O^(2-)or Li^(+),is activated due to their diferent migration energy barriers,cooperated by the valence change of other immobile ions in the host lattice matrix,e.g.,Co^(2+)/Co^(3+)and Mn^(3+)/Mn4+redox couples,owing to the charge *** we select spinel Li4Ti5O12 as anode and construct an all-solid-state battery under a transmission electron microscope;a synergistic transportation of O^(2-)and Li^(+)driven by an electrical bias was directly observed at the atomic scale.A small amount of oxygen anions was extracted frstly as a result of its lowest vacancy formation energy under 2.2 v,leading to the vertical displacement of *** to 2.7 v,an ordered phase with both Li-and O-defciency *** Li^(+)and O^(2-)ions are simultaneously extracted out from the[LiO_(4)]tetrahedra due to the electroneutrality *** migration paths of O and Li have been proposed and verifed by frst-principles *** results reveal a brand.new synergistic ion migration manner and may provide up-to-date insights on the transportation process of lithium ion conductors.

关键词： synergistic battery migration

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Phase Transitions and Anion Exchange in All-Inorganic Halide Perovskites

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Accounts of Materials Research 2020年第1期1卷 3-15页

作者： julian A.Steele Minliang Lai Ye Zhang Zhenni Lin johan Hofkens Maarten B.j.Roeffaers Peidong Yang cMACS Department of Microbial and Molecular SystemsKU Leuven3001 LeuvenBelgium Department of Chemistry University of CaliforniaBerkeleyCalifornia 94720United States Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720United States Department of Materials Science and Engineering University of CaliforniaBerkeleyCalifornia 94720United States Department of Chemistry KU Leuven3001 HeverleeBelgium Max Plank Institute for Polymer Research Mainz D-55128Germany Kavli Energy nano Science Institute BerkeleyCalifornia 94720United States

COnSPECTUS:A new generation of semiconducting materials based on metal halide perovskites has recently been launched into the scientific spotlight,exhibiting outstanding optoelectronic properties and providing promise for the development of efficient optical *** a vivid example,solar cells made from these materials have quickly reached conversion efficiencies exceeding 25%,now on par with well-established technologies,like *** widespread success is due,in part,to a unique ability to retain high-quality optoelectronic performance while being easily solutionprocessed into thin *** feature is what defines them as a brand.new class of optoelectronic materials,with the ability to compete with traditional semiconductors requiring higher processing costs,like the III−vs or II−***,the interesting photophysics of metal halide perovskites come with a catch;their soft ionic lattice promotes complex thermal-induced phase transitions and a high capacity for postsynthetic compositional changes,e.g.,halide anion *** dynamic behavior has ultimately made understanding several important structure−property relationships ambiguous and obstructed a clear path toward commercialization due to inherent phase *** aim in this Account is to highlight the fundamental aspects of metal halide perovskites that dictate a stable crystal structure and enable efficient anion exchange,through the lens of thermodynamic preference and phase formation *** the allinorganic CsPbI3‑xBrx system as a suitable case study,we focus on several ways in which its thermodynamically unstable perovskite structure can be maintained at room temperature and elucidate the restructuring pathways taken during *** addition,we will discuss the origin and mechanisms of postsynthetic anion exchange in CsPbX3(X=I,Br,Cl)perovskites,with emphasis made toward direct visualization using in situ optical microspectroscopy and arriving at quantitative resu

关键词： properties. perovskite halide

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