Fabrication and nucleation study of β-PbO2–Co3O4 OER energy-saving electrode

Abstract

In this study, β-PbO 2-Co 3 O 4 composite coatings were synthesized on a substrate using the electrodeposition method in an electrolyte containing Pb 2+ and Co 3 O 4 particles. The preparation process study shows that the β-PbO 2 bath containing Co 3 O 4 particles becomes more stable for an ultrasonic dispersion time within 30 min, with the stability beginning to decrease after the ultrasonic time exceeds 30 min. Co 3 O 4 particles in the β-PbO 2 bath are positively charged, with anions being adsorbed onto the particles. The nucleation behavior study shows that the electric field force plays a dominant role in the adsorption process for the Co 3 O 4 particles. The nucleation and growth of β-PbO 2 on the Co 3 O 4 particles started for the particles closer to the substrate. In addition, the thickness of the β-PbO 2 layer on the Co 3 O 4 particles was inversely proportional to the distance between the Co 3 O 4 particles and the substrate. Compared to the pure PbO 2 electrode, the oxygen evolution overpotentials for the β-PbO 2-Co 3 O 4 electrode are decreased significantly, which demonstrates an energy-saving effect.

Impact of Co3O4 nanoparticles on epoxy's mechanical and corrosion-resistance properties for carbon steel in seawater

“…High zeta potential for a dispersion system, whether positive or negative, suggests that the particles are resistant to aggregation and indicates an apparently stable system 38 . The surface of synthesized Co 3 O 4 -NPs is the negative value of zeta potential which agrees with the literature 39 , 40 .

Figure 4 Zeta potential distribution of Co 3 O 4 -NPs.

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