centre for electrochemical synthesis of nanomaterials and functional coatings

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

tamazagladze@emd.ge

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