Abstract
Titanium-based PbO2 electrodes are widely used for chemical industries, such as electrodialysis, electrolysis, and electrodepositing, to improve the mechanical and life cycle properties of Pb metal electrodes. However, PbO2 electrodes are usually electrodeposited onto rigid metals due to its soft characteristic, which results in severe passivation problems requiring thin thickness and high porosity. It is of great importance to develop a rigid Pb metal electrode system since thermal spraying and welding methods fail to manufacture such a promising electrode. In the present work, the cold spraying method was used to deposit a pure Pb metal coating with thickness of above 500 μm on Q235 steel substrate. The coating has good physical performances, the porosity is less than 1%, and the bonding strength ranges from 6.25 to 7.75 MPa. The cross-sectional morphology suggests that no through-thickness pores exist in the coating. The oxygen evolution potential is larger than 1.5 V vs. SCE, which is similar to the potential of the titanium-based PbO2 electrode. Dynamic polarization curves and cyclic voltammetry curves of coated sample in sodium sulfate solution indicate that cold sprayed Pb coating is a good electrode for electrochemical reduction reactions. All our results mean that cold spraying is capable of manufacturing electrode materials for electrochemical industries.
Highlights
PbO2 electrodes are widely used for chemical industries, such as electrodialysis, electrolysis, and electrodepositing, and especially in the production of 1,4-dicyanobutane, which is usually in plate shape (Figure 1 shows a typical schematic setup of a bipolar electrolysis system [1,2,3].The distance (L) between electrodes in an electrochemical system is always very narrow—always narrower than 3 mm—to improve the reaction efficiency by increasing the turbulence of the electrolyte flow
Dynamic polarization curves and cyclic voltammetry curves of coated sample in sodium sulfate solution indicate that cold sprayed Pb coating is a good electrode for electrochemical reduction reactions
PbO2 electrodes were prepared on Pb metal directly by anodic oxidation [4]
Summary
The distance (L) between electrodes in an electrochemical system is always very narrow—always narrower than 3 mm—to improve the reaction efficiency by increasing the turbulence of the electrolyte flow. PbO2 electrodes were prepared on Pb metal directly by anodic oxidation [4]. These kinds of electrodes suffer from poor mechanical properties. PbO2 electrodes are usually prepared on some rigid valve metal, such as titanium, tantalum, and zirconium, which have both high mechanical strength and good conductivity. Titanium-based PbO2 anodes fail because of corrosion of the substrate, resulting in an abrupt increase of the cell voltage of the electrochemical system [5,6]. A transition layer was usually used to promote the anticorrosion
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