Periodicity in the Electrochemical Dissolution of Transition Metals

Extensive research efforts are currently dedicated to the search for new electrocatalyst materials in which expensive and rare noble metals are replaced with cheaper and more abundant transition metals. Recently, numerous alloys, oxides, and composites with such metals have been identified as highly active electrocatalysts through the use of high-throughput screening methods with the help of activity descriptors. Up to this point, stability has lacked such descriptors. Hence, we elucidate the role of intrinsic metal/oxide properties on the corrosion behavior of representative 3d, 4d, and 5d transition metals. Electrochemical dissolution of nine transition metals is quantified using online inductively coupled plasma mass spectrometry (ICP-MS). Based on the obtained dissolution data in alkaline and acidic media, we establish clear periodic correlations between the amount of dissolved metal, the cohesive energy of the metal atoms (E-coh), and the energy of oxygen adsorption on the metal (Delta H-O,H-ads). Such correlations can support the knowledge-driven search for more stable electrocatalysts.

Automated summary

Current research focuses on finding cheaper transition metals to replace expensive noble metals as electrocatalyst materials, utilizing activity descriptors for identifying highly active electrocatalysts and establishing periodic correlations to support the design of more stable electrocatalysts.