MATERIALS FOR HIGH TECHNOLOGY; INVESTIGATION OF THE SURFACES AND PROCESSES
Main researcher
: METIKOŠ-HUKOVIĆ, MIRJANA (30602) Assistants
LISAC, EMA (57281)
ŠERUGA, MARIJAN (73953)
FERINA, SLAVKO (61395)
LONČAR, MIRJANA (42440)
ŠVAJCER-RENDIĆ, ANICA (177001)
REŠETIĆ, ANTONIJA (40906)
CERAJ-CERIĆ, MIHAJLO (34845)
SORIĆ, TOMISLAV (11963)
BRINIĆ, SLOBODAN (181051)
BABIĆ, RANKO (190062)
GVOZDIĆ, VLATKA (126612)
GRUBAČ, ZORAN (126072)
BOSNIĆ-MILOŠEV, INGRID (196421)
GOJIĆ, MIRKO (63390)
OMANOVIĆ, SAŠA (186633)
HORVAT, ROBERTA (900574)
Type of research: basic Duration from: 01/01/91. to 12/31/93. Papers on project (total): 113
Papers on project quoted in Current Contents: 38
Institution name: Fakultet kemijskog inženjerstva i tehnologije, Zagreb (125) Department/Institute: Department of Electrochemistry Address: Savska cesta 16/I City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (01) 430-700
Fax: 385 (01) 430-700
Fax: 385 (041) 450-725
Summary: The project focused on the investigations of structural
properties of the electrificated solid/electrolyte interface and
dielectric properties of thin surface films, as well as the mechanism of
charge transfer across the interphase boundaries and surface films.
Simultaneously with the characterization of the physical properties of a
solid phase, the surface (electrochemical) reactions were studied with a
view to collect the results in fundamental and applicable categories of
investigations. The following systems were investigated: - transition
metals and their alloys, with thin semiconducting passive surface films, -
valve (hydride) metals, with barrier insulating surface films, -
metallic glasses, with thin passive surface films, and - organic
coatings on metal substrate. Besides the improvements in basic knowledge
and their possible application, the principal benefit of these studies was
to educate young scientists and students(1) for such a promising field.
The data were treated applying the mathematical models and algorithms,
developed through studies of electrochemical kinetics, electrochemistry of
semmiconducting and insulating materials, as well as solid-state physic.
The studies were performed using in-situ techniques (electrochemical
spectroscopy, i.e. cyclic voltammetry (CV), chronoamperometry (CA),
chronopotentiometry (CE), electrochemical impedance spectroscopy (EIS) and
photoelectrochemical spectroscopy (PES)) and ex-situ techniques (Auger
Electron Spectroscopy (AES), X-ray Photoelectronic Spectroscopy (XPS),
Scanning Electron Microscopy (SEM), X-ray Diffraction and Energy
Dispersion X-ray Spectroscopy (EDXS)).
-------------------------------------------------- (1) Six young scientist
achieved Master degree, and two achieved Ph.D. degree, during the time of
project duration. Except one, all of them were involved in work on the
project. Three Dissertations and two Master theses will be completed
within next six months. Ten Diploma works were made in the area of the
project title (theme), and four student works were awarded with the
"Rector Award for the Best Written Students Work" in 1992, 1993, 1994 and
1995.
Research goals: The objective of the project is to define: - the
relation between the electronic structure, electric, dielectric and
solid-state surface properties and properties of the solid-liquid
interfaces, - the mechanism of charge transfer (conductivity) of thin
surface film formation and decomposition processes, - the mechanism of
thin passive films electronic conductivity, - the mechanism and kinetics of
nucleation processes for new phase segregation, - the mechanism and
kinetics of solid-state transformations, - the electronic, electrical and
dielectrical properties of surface films, - the corrosion stability of
materials against the anodic and cathodic decomposition, - the corrosion
kinetics parameters and adsorption isotherms The systems proposed for
investigation are of a great interest for the development of new
technologies, since they include models which are significant in theory
and in application. These are: - metal/electrolyte, -
semiconductor/electrolyte, - metal/oxide film/electrolyte - metal/organic
coating/electrolyte The performed investigations provide a profound
understanding of the influence of surface state of material on the various
types of electrode processes important in energy conversion, in
catalysis, in corrosion and corrosion prevention, and in organic and
inorganic synthesis.
COOPERATION - PROJECTS
Name of project
: Performances of Catalysts for the
electrooxidation of Organic Fuels in Acid Electrolytes Name of institution: Perfomanse katalizatora za elektrooksidaciju
organiskih goriva u kiselim elektrolitima City: Juelich, Germany
COOPERATION - INSTITUTIONS
Name of institution
: Forschungszentrum Juelich GmbH Type of institution: State institute Type of cooperation: Joint project City: Juelich, Germany Other information about the project.