Preparation and Electrochemical Performance of Palladium-Nickel Bimetallic Electrode Modified by Polymeric Pyrrole and Sodium Dodecylbenzenesulfonate

Palladium-nickel(Pd-Ni) bimetallic composite electrodes(Pd-Ni/PPy/Ti electrode and Pd-Ni(SDBS)/PPy/Ti electrode) were fabricated on meshed titanium(Ti) substrates by electrochemical deposition in the presence of polymeric pyrrole(PPy) and PPy-sodium dodecylbenzenesulfonate(SDBS),respectively.The effects of the doped SDBS on electrochemical catalytic activities were studied.Cyclic voltammetry(CV) revealed that the hydrogen adsorption peak value of Pd-Ni/PPy/Ti electrode was-93 mA,and that of Pd-Ni(SDBS)/PPy/Ti electrode was-154 mA,which indicated that the latter had better electrochemical catalytic activity.Scanning electron microscope(SEM) images revealed the effects of PPy and SDBS on the surface morphologies of electrodes.The quantities of the Pd and Ni on Pd-Ni/PPy/Ti and Pd-Ni(SDBS)/PPy/Ti electrodes were analyzed by means of inductively coupled plasma-atomic emission spectrometry(ICP-AES).The results of X-ray diffraction(XRD) showed that both electrode films were made of Pd-Ni alloy.Experimental results indicate that Pd-Ni(SDBS)/PPy/Ti electrode has good electrochemical catalytic activity and high potential of reductive dechlorination under lower Pd loading due to the addition of surfactant SDBS.