Towards a comprehensive understanding of platinum dissolution in acidic media

摘要: Platinum is one of the most important electrode materials for continuous electrochemical energy conversion due to its high activity and stability. The resistance this scarce material towards dissolution however limited under harsh operational conditions that can occur in fuel cells or other devices. In order improve understanding platinum, we therefore investigate issue with an flow cell system connected inductively coupled plasma mass spectrometer (ICP-MS) capable online quantification even small traces dissolved elements solution. data combined downstream analytics are used evaluate influence various parameters on processes acidic electrolytes at room temperature. a transient process, occurring during both positive- negative-going sweeps over potentials ca. 1.1 VRHE depending strongly structure chemistry formed oxide. amount anodically platinum thereby related number low-coordinated surface sites, whereas cathodic depends oxide timescale. Thus, tentative mechanism Pt suggested based place exchange oxygen atoms from sub-surface positions.