| Abstract [eng] |
This work focuses on the investigation of electrochemical ways to synthesize and evaluate porous metal foams. The first part of the thesis covers ways to electrochemically deposit porous Co and Co-Pt-based foams, using a dynamic hydrogen bubbles template. Various deposition conditions were investigated, and effects it has on porosity, pore size, and overall morphology of the foams. Obtained Co and Co-Pt foams were investigated using electrochemical impedance spectroscopy, and true surface area estimated from double-layer capacitance. The foams were tested as catalysts in alkaline electrochemical water splitting reactions. Co foams were also used as very sensitive and responsive sensors for free chlorine in water, by modifying them, forming a Prussian Blue-like compound. Commercial Cu foams have been also investigated as potential cathodes for copper electrowinning. Using EIS data it has been established that the true surface area of the foam is 7-14 times larger than falt copper plates of the same geometrical area. The commercial Cu foam also had a lower charge transfer resistance, when compared to a flat surface. Also, the foam had times better hydrodynamic capabilities, than the flat surface. The commercial Cu foam was modified by depositing Fe onto it and used as a catalyst in the Fenton reaction. Effects of deposition conditions, as well as the concentration of H2O2, methyl orange, and temperature, were investigated on the efficiency of the methyl orange breakdown. |
