Ti/SnO 2 -Sb-Ir electrodes doped with a low Ir content were prepared, and they were used in acidic water electrolysis for the oxygen evolution reaction (OER). The results showed that an IrO 2 −SnO 2 solid solution was formed, and the electrode surface was relatively compact. The doping of IrO 2 could significantly improve the electrocatalytic activity and stability of Ti/SnO 2 -Sb electrode for OER. The electrode modified with only 5 mol % Ir met the needs of acidic water electrolysis. Meanwhile, the performances of the electrode approached that of Ti/IrO 2 when Ir content was only 8 mol %, which resulted from the fact that IrO 2 doping improved the chemical stability as well as the electrocatalytic activity of the electrode. Moreover, the deactivation behavior of the electrode was investigated as well. It was mainly ascribed to the chemical composition and morphology change induced by continuous dissolution of the metal oxides, which eventually led to the passivation of the Ti substrate.
The deposition of calcium carbonate
scale on a metal surface is
undesirable in industrial processes. Electrochemical corrosion processes
at the metal–water interface can induce the deposition of calcium
carbonate scale. In this paper, galvanic deposition and potentiostatic
deposition methods were used to investigate the influence of electrochemical
corrosion behavior of carbon steel on the deposition behavior of calcium
carbonate. Results reveal that aragonite tends to deposit on carbon
steel due to the disturbance of ferrous ions released from a micro
galvanic corrosion cell. Once anodically released ferrous ions diffuse
to the adjacent cathodic regions; they not only can decrease the interfacial
oxygen concentration by preferentially consuming local dissolved oxygen
but also can lower the local pH by forming iron hydroxides. Such processes
build a relative low CaCO3 supersaturation environment
at the metal–water interface, favoring the deposition of aragonite.
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