Why Dimensionally Stable Anodes and Titanium Plates are Used for Electrodeposition Of Copper?

Why Dimensionally Stable Anodes and Titanium Plates are Used for Electrodeposition Of Copper?

Recently, dimensionally stable anode (DSA) for the electrochemical reaction is used in various electric industries such as electroplating, non-degradable wastewater treatment, seawater purification, catalyst electrode of the fuel cell.

The electrodeposited copper foil process was reduction copper from electrolyte using DSA and titanium plate cathode. High current is applied in this process, copper is deposited at a high rate on the cathode, and oxygen evolution reaction increased in the anode. Increasing oxygen reaction was facilitated degradation on the surface of the anode, a corresponding increase in applied voltage, and power consumption.

Therefore, the long-term stability of DSA is the most important property for electrodeposition of copper thin film. DSAs have fabricated two or three components of metal oxide such as iridium, ruthenium, tantalum, and platinum because of their electrochemical performance and stability. It was generally known that electrochemical performance and lifetime of the DSA could be determined by the electrode production method such as the pre-treatment of titanium surface, coating thickness, the optimal composition of novel metal oxide, and heat treatment.

Surface etching of titanium plate by acid solution leads to remove the oxide layer and surface roughening, which is ascribed to an increase in interfacial bonding between the coating layer and substrate due to an increase in the surface contact area. The thick coating layer has reduced the heat of reaction during electrochemical reaction at high current conditions. The high heat of reaction for DSA is delaminated the interface between the novel coating layer and titanium substrate. The fabricated DSA by thermal decomposition at high temperature existed mud crack structure. The electrolyte penetrates into the inner surface (grain boundary and cracks) of electrodes during the electrolysis, leading to an increase in the active site for oxygen evolution.