A Novel Stripping Method for Platinum Metal Oxide Layer Catalyst on Titanium Substrate

초록

Platinum group metals (PGM) are important and rare metals which are entirely imported from overseas and are only present in a few regions of certain countries. Any supply or demand disruption could pose a significant risk to the domestic advanced industrial sector. Currently, PGM oxide electrodes are not recycled and are entirely exported as scrap. This study focused on developing a novel stripping method for the catalyst layer of PGM oxide electrodes. Mechanical stripping methods used in the industry, such as sandblasting and chemical stripping, are unable to reuse substrates due to potentially damaging the titanium and introducing excessive impurities into the material, which leads to technical limitations in refining and purifying recycled electrodes. Therefore, an experimental study was conducted on a thermochemical stripping method to overcome these shortcomings. By selecting an alkaline surface coating solution and determining the optimal process parameters, such as heat treatment temperature and time, this study presents a novel stripping method that enables the reuse of titanium substrates while minimizing damage and impurities mixed in the stripped material. Later, this approach was used to efficiently recycle iridium, a poorly soluble element among PGM oxide electrodes. © 2025, Korea Society of Waste Management. All rights reserved.

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