Nanoscale morphological evolution of monocrystalline Pt surfaces during cathodic corrosion

• DOI: 10.1073/pnas.2017086117
• Publication Date: 2020-12-07T21:59:33Z
• Authors: Nakkiran Arulmozhi; Thomas J. P. Hers...; Marc T. M. Koper
• Keywords: Physical Sciences; 02 engineering and technology; 0210 nano-technology

Significance Cathodic corrosion is a relatively unexplored but highly enigmatic electrochemical phenomenon that transforms, roughens, and dissolves metal surfaces under cathodic polarization. We show how cathodic corrosion of a platinum spherical single-crystal electrode in an aqueous alkaline electrolyte leads initially to the formation of etch pits that reflect the local symmetry of the surface and subsequently develop into a growth regime in which self-similar diffusion-limited patterns emerge. These are unique observations that may eventually open the door to controlled surface patterning and nanoparticle preparation.