Abstract
The corrosion resistance and electrocatalytic activity for chlorine and oxygen evolutions of amorphous palladium-iridium-phosphorus alloys containing a small amount of titanium, rhodium, platinum and/or ruthernium in a hot concentrated sodium-chloride solution were investigated. The amorphous alloys showed passivation and chlorine evolution by anodic polarization, and their corrosion resistance under the chlorine evolution conditions was considerably high due to the formation of a stable passive film. The electrocatalytic activity of several amorphous alloys for chlorine evolution was significantly higher than that of the DSA-type RuO 2/Ti electrode, while their catalytic activity for oxygen evolution is one or two orders of magnitude lower than that of the RuO 2/Ti electrode, suggesting that the amorphous alloys are capable of producing high purity chlorine with a high efficiency.
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