On the origin of univalent Mg$^+$ ions in solution and their role in anomalous anodic hydrogen evolution
Abstract
Aqueous metal corrosion is a major economic concern in modern society. A phenomenon that has puzzled generations of scientists in this field is the so-called anomalous hydrogen evolution: the violent dissolution of magnesium under electron-rich (anodic) conditions, accompanied by strong hydrogen evolution, and a key mechanism hampering Mg technology. Experimental studies have indicated the presence of univalent Mg in solution, but these findings have been largely ignored because they defy our common chemical understanding and evaded direct experimental observation. Using recent advances in the \emph{ab initio} description of solid-liquid electrochemical interfaces under controlled potential conditions, we described the full reaction path of Mg atom dissolution from a kinked Mg surface under anodic conditions. Our study reveals the formation of a solvated [Mg(OH)] ion complex, challenging the conventional assumption of Mg ion. This insight provides an intuitive explanation for the postulated presence of (coulombically) univalent Mg ions and the absence of protective oxide/hydroxide layers normally formed under anodic/oxidizing conditions. The discovery of this unexpected and unconventional reaction mechanism is crucial for identifying new strategies for corrosion prevention and can be transferred to other metals.
Keywords
Cite
@article{arxiv.2407.13472,
title = {On the origin of univalent Mg$^+$ ions in solution and their role in anomalous anodic hydrogen evolution},
author = {Florian Deißenbeck and Sudarsan Surendralal and Mira Todorova and Stefan Wippermann and Jörg Neugebauer},
journal= {arXiv preprint arXiv:2407.13472},
year = {2026}
}