Corrosion Study of Cr-Oxide Ceramics Using Rotating Ring Disk Electrode

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Proton Exchange Membrane Electrolysis demands new resistant and cheap materials for the anode components, and Cr-based spinels are acid stable ceramics, which may meet the requirements of such application to some extent. This work reports the electrochemical behavior of spinel-structured MnCu0.25Cr1.75O4 and NiCr2Oup to 2.0 V in order to determine the stability/dissolution of such materials when exposed to anodic potential. The ceramic/graphite composite was deposited on a rotating ring disk electrode and scanned while the ring electrode was held at 0.5 V vs SHE. The dissolution of Cr species was observed to happen as the oxidation proceeded by collecting the dissolved products at the ring electrode. HCrO4 and MnO4 were identified as dissolved products. Analysis of post-test solutions, revealed the difference between chemical and electrochemical corrosion of the materials.
Original languageEnglish
JournalJournal of The Electrochemical Society
Issue number11
Pages (from-to)C3159-C3169
Publication statusPublished - 2019
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