Influences of Cerium on the Electrodeposition Process and Physicochemical Properties of Lead Dioxide Electrodes

Abstract

The influence of cerium on lead dioxide electrodeposition process on a glass carbon electrode (GCE) from lead nitrate solution was studied by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). Cerium exhibit an inhibition effect on the lead dioxide electrodeposition process. Instantaneous nucleation mechanism can be found for lead dioxide electrodeposition according to Scharifker-Hills' model with three-dimensional growth, which is not influenced by the addition of cerium. The morphology and structure of Ce-doped PbO 2 electrodes were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the adulteration of cerium can greatly decrease grain size and make the films more compact. Accelerated lifetime tests demonstrate that the adulteration of cerium can highly lengthen the service life of Ce-doped PbO 2 electrode in its practical application. Methylene blue degradation experiments reveal that the Ce-doped PbO 2 electrodes possess excellent electrocatalytic activity.

Preparation and Characterization of PbO2-CeO2Nanocomposite Electrode with High Cerium Content and Its Appplication in the Electrocatalytic Degradation of Malachite Green

“…When the CeO 2 nanoparticles concentration in the solution is 60 mmol L −1 , the atomic percentage of cerium in the electrodes reaches 8.79 at%, which is about 12 times higher than that in the Ce-doped PbO 2 electrode, which is only 0.7 at%. 20 It is worth noting that the atomic percentage of cerium in the electrodes could further increase if added much more CeO 2 nanoparticles, but a conglobation trend occurs, which influence the performance of electrodes. So the appropriate concentration of CeO 2 nanoparticles is kept at 60 mmol L −1 .…”

“…The SnO 2 -Sb 2 O 3 interlayer deposited on the Ti plates was prepared by thermal decomposition, which could enhance the conductivity of the electrode and improve catalytic characteristics. 28 20.0 g SnCl 2 , 2.0 g SbCl 3 and 13.2 mL concentrated HCl were dissolved in 100 mL isopropanol. The Ti…”

“…But the atomic percentage of cerium in the PbO 2 electrodes only 0.4-0.7 at%, 19,20 which is relatively low. If the percentage of cerium continues to increase, the Ce-doped PbO 2 electrodes should become rough and unstable.…”

“…Liu et al 19 investigated on the electrochemical properties of Ce-doped lead dioxide anode and applied it for elimination of nitrophenol. In our previous work, 20 we studied the influence of cerium on lead dioxide electrodeposition process from lead nitrate solution. The results show that the electrocatalytic ability and stability of Ce-doped PbO 2 electrodes enhance with the increase of cerium content.…”

“…The composition of the plating bath was: 0.2 mol L −1 Pb(NO 3 ) 2 and 0.1 mol L −1 HNO 3 , based on our previous work. 20 The CeO 2 nanoparticles were added into the solution from 15 to 60 mmol L −1 . Prior to electrodeposition, ultrasonic agitation was applied to mix the CeO 2 nanoparticles and the electrolyte for 3 h. The sediment volume of CeO 2 suspensions was 2.0 ml by measuring the sediment volume of 10 ml suspensions after 2 h. The Pb electrode was used as the cathode, the anode was Ti coated with a SnO 2 -Sb 2 O 3 interlayer.…”