Highly porous Ti-Ni anodes for electrochemical oxidations
This work describes a general method to obtain highly porous electrodes and their use as Dimensionally Stable Anodes for the O2 evolution (OER) and CO2 reduction reactions(CO2RR). By using a powder metallurgy based process, where metallic titanium and nickel powders are pressed and thermally treated to form “green compacts”, we obtain electrodes that benefit from a 1000 fold increase in the Electrochemically Surface Area (ECSA). In addition, active catalytic species for water oxidation (i.e. NiOOH) are generated during the processing converting these electrodes as ideal candidates to be evaluated in oxidation reactions. Excellent OER performance is obtained with overpotentials below 270 mV at 10 mA/cm2, exceeding those of commercially available alternatives. Alternatively, the electrode can be used as counterelectrode for CO2 reduction reaction with similar results to those obtained with Pt. The current work paves the way for a generic method that will be expanded for other electrochemical reactions.