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New Perspective of Electrochemical Nucleation and Growth Based on Local Electrochemistry: A Multi-microscopy Approach

par Torres Morillo, Daniel ;Bernal, Miguel ;Ustarroz Troyano, Jon
Référence Annual Meeting(74th: September, 2023: Lyon, France), Annual Meeting of the International Society of Electrochemistry
Publication Publié, 2023-09

Abstract de conférence

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Résumé :

Electrodeposition remains an electrochemical reaction of fundamental interest in many technologies and applications. This demands a comprehensive understanding of the electrodeposition process and the different stages which control the electrochemical nucleation and growth (EN&G) of a new phase on a foreign substrate. However, such understanding remains elusive due to the challenge of probing micro/nanoscopic nucleation sites and extracting a statistical interpretation of the nucleation process. Moreover, the electrochemical magnitudes are generally recorded over macroscopic areas (mm2), then correlated with surface characterization obtained from a much different scale (~μm2), which is not necessarily representative of the macroscopic surface. Therefore, it becomes extremely relevant to establish correlations between the local electrochemical evaluation and the local features through surface characterization techniques that can be co-located with the same area on the same scale. We have employed Scanning Electrochemical Cell Microscopy (SECCM) as a powerful and versatile scanning probe technique, capable of surveying the surface with a high spatial-temporal resolution, to study the EN&G of Cu on a glassy carbon substrate on a scale closer to the initial stages of the electrodeposition process (i.e., local scale). Combining the local electrochemical information with other imaging methods, such as Scanning Electron Microscopy (SEM), that can be co-located with the same area on the same scale, we can establish unambiguous correlations and a more complete understanding of the electrochemical response at the local scale. This so-called multi-microscopy approach provides us the means to study the relationship between the EN&G and the morphological, structural, and compositional features of a substrate and the deposit. By characterizing the electrochemical response on a scale closer to the initial stages of electrodeposition, we can bring forward information that is simply unavailable with the conventional macroscopic approach and conceive new analysis strategies to understand the real nature of active sites for nucleation [1,2].[1] D. Torres, M. Bernal, A. Demaude, S. Hussain, L. Bar, P. Losada-Pérez, F. Reniers, J. Ustarroz, Distribution of Copper Electrochemical Nucleation Activities on Glassy Carbon: A New Perspective Based on Local Electrochemistry, J. Electrochem. Soc. 169 (2022) 102513.[2] M. Bernal, D. Torres, S.S. Parapari, M. Čeh, K.Ž. Rožman, S. Šturm, J. Ustarroz, A microscopic view on the electrochemical deposition and dissolution of Au with scanning electrochemical cell microscopy – Part I, Electrochim. Acta. 445 (2023) 142023.