centre for electrochemical synthesis of nanomaterials and functional coatings
DESCRIPTION
Centre for Electrochemical Synthesis of Nanomaterials and Functional Coatings Faculty of Chemical Technology Metalurgy Prof. Dr. Sc. Tamaz Agladze. [email protected]. Basic Research Directions Novel Electrochemical Technique for Synthesis and Size Tuning of Metal Nanoparticles - PowerPoint PPT PresentationTRANSCRIPT
Centre for Electrochemical Synthesis of Nanomaterials and Functional Coatings
Faculty of Chemical Technology MetalurgyProf. Dr. Sc. Tamaz Agladze
Basic Research Directions
• Novel Electrochemical Technique for Synthesis and Size Tuning of Metal Nanoparticles
• Implementation of Metal and Composite Nanomaterials for:
Water Disinfection and PurificationLow-cost Three-way Catalytic Converters of Toxic
Emissions
• Novel Electrodeposited Metal Hydride Materials for Catalysis and Energy Storage
Novel Electrochemical Technique for Synthesis and Size Tuning of Metal Nanoparticles
• The technique provides an instrumental approach to multiparametric control over the rates of size determining processes such as nucleation, growth, stabilization and dispersion of metal clusters.
• The particle size is tuned by variation in the residence time τR, during which metal cluster formed at a cathode in an aqueous electrolyte is allowed to adsorb amphiphile molecules of surfactant dissolved in an organic solvent is demonstrated.
Electrochemical cell for synthesis of metal nanozoles
T. Agladze at al. Z. Phys. Chem. 227 (2013) 1–13
Core-Shell NPs
Diam.(nm)-25.52% Intensity-60.7
Diam.(nm)-22.6% Intensity-56.2
Diam.(nm)-18.6% Intensity-79.3
DSL patterns
Variation in particle size with resident time
Ag TEM images
Size Tuning
Noble Metal Free Three-Way Catalytic Converters (TWC)
TWC, (CO, CHx, Nox) which is the primary modern emission control technology on gasoline vehicles utilize precious metals (Pt, Pd, Rh) Target Noble metal free cost-effective high-performance TWC nanomaterials
0 100 200 300 400 500 6000
20
40
60
80
100
120
300°C
Manganese Nanocomposite
Catalyst C
O C
on
vert
sio
n,
%
Temperature, °C
• Heat Treatment 105-1000°C
• 40 Cycles, toal 100 hours
500°C
800°C
1000°C
Max treatment temp.
100%
conversion temperatu
re
Test
Electrodeposited Manganese Hydride-Perspective Material for Catalysis and Energy Storage
• Metastable Mn-H is able to release hydrogen at a rate ~0,02gH2/s(atmospheric pressure, 70°C ) which meets DOE requirements for hydrogen storage materials
0 5 10 15 20 25 300
0.5
1
1.5
2
2.5
3
3.570°C
60°C
50°C
H2 v
olu
me ,
l/kg
Mn
Time, min
30°C
• MnHx is synthesized, isolated and physic-chemical properties are studded for the first time
66°
54°
56°
Thermo Phase Transformation
OPD (M )
Dissolution (M
)
Phase Transformation
Pote
nti
al
, -E
Partial rates, lgi
MH
D
ecom
posit
ionUPD (M
n-H)
E M
0
E MH0,MS
MSi0,M
HiM0
Electrochemical Phase Transformation
Magnetic Properties of the Phases
Mn-H
Mn Mn-H
Mn
Electrochemical Multilayer
T. Agladze at al. El. Acta, 2014
Thank you