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Physicochemical properties of proton-conducting SmNiO3 epitaxial films

Journal of Materiomics 2019年第2期5卷 247-251页

作者： Xing Xu Chen Liu Jing Ma Allan J.Jacobson Cewen Nan Chonglin Chen School of Material Science and Engineering Tsinghua UniversityBeijing100086China Department of Chemistry and Texas Center for Superconductivity University of HoustonHoustonTX77204USA Department of Physics and Astronomy University of Texas at San AntonioSan AntonioTX78249USA

Proton conducting SmNiO_(3)(SNO)thin films were grown on(001)LaAlO_(3)substrates for systematically investigating the proton transport properties.X-ray Diffraction and Atomic Force Microscopy studies reveal that the as-grown SNO thin films have good single crystallinity and smooth surface *** electrical conductivity measurements in air indicate a peak at 473 K in the temperature dependence of the resistance of the SNO films,probably due to oxygen loss on heating.A Metal-Insulator-Transition occurs at 373 K for the films after annealing at 873 K in *** a hydrogen atmosphere(3%H_(2)/97%N_(2)),an anomalous peak in the resistance is found at 685 K on the first heating *** impedance Spectroscopy studies as a function of temperature indicate that the SNO films have a high ionic conductivity(0.030 S/cm at 773 K)in a hydrogen *** activation energy for proton conductivity was determined to be 0.23 eV at 473-773 K and 0.37 eV at 773e973 K *** findings demonstrate that SNO thin films have good proton conductivity and are good candidate electrolytes for low temperature proton-conducting Solid Oxide Fuel Cells.

关键词： SmNiO_(3) Thin film Transport properties Ionic conductivity impedance measurements

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Nucleation and Growth of Thallium on Thin Film Mercury Electrode: Voltammetric, Scanning Electron Microscopy, Chronoamperometric and Electrochemical impedance Studies

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American Journal of Analytical Chemistry 2022年第11期13卷 415-430页

作者： Abdoulkadri Ayouba Mahamane Boubié Guel Paul-Louis Fabre Laboratoire Matériaux Eaux Environnement (LAMEE) Faculté des Sciences et Techniques Université Abdou Moumouni Niamey Niger Laboratoire de Chimie Moléculaire et des Matériaux Equipe Chimie Physique et Electrochimie Département de Chimie UniversitéJoseph KI ZERBO Ouagadougou Burkina Faso Unité Mixte de Recherche (UMR CNRS 5503) Laboratoire de Génie Chimique Toulouse France

Thallium is a heavy metal highly toxic to the biosphere. It can be determined by anodic stripping voltammetry after deposition on mercury film. The aim of this work is to study the conditions and mechanisms of deposition of Hg on glassy carbon electrode and Tl on Hg film by cyclic voltammetry, scanning electron microscopy, chronoamperometry and impedance techniques. The results showed a germination and growth of a 3D Hg phase on glassy carbon electrode. Similarly, the electrodeposition of Tl on Hg follows a 3D three-dimensional nucleation with diffusion controlled growth. The impedance measurements reveal an easier charge transfer on the Tl film.

关键词： Thallium Mercury Film Cyclic Voltammetry Scanning Electron Microscopy impedance measurements

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