SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 86: Solid-Liquid Interfaces II: Reactions and Electrochemistry I

O 86.9: Vortrag

Donnerstag, 30. März 2023, 17:15–17:30, TRE Phy

Electrodeposition and Electrochemical Characterization of Thin Nickel Overlayers on Au(111) — •Markus Wittmann, Ludwig A. Kibler, and Timo Jacob — Ulm University, Institute of Electrochemistry, 89069 Ulm, Germany

Nickel is widely used in energy storage and conversion, e.g. nickel–iron, nickel–cadmium, and nickel–metal hydride batteries. The behavior of nickel electrodes has been investigated extensively. However, a detailed understanding of adsorption and absorption processes on the atomic level is still missing. In particular, the distinction between surface and bulk atoms, as well as adsorbed hydrogen during electrooxidation is difficult.[1,2] Here we report on the electrochemical fabrication of thin nickel overlayers on Au(111) and their electrochemical characterization. Stable nickel overlayers have been electrochemically deposited onto Au(111) from a 1 mM NiSO4 solution and subsequently characterized by cyclic voltammetry in a 10 mM KOH solution. The current density–potential curves of nickel overlayers on an Au(111) single crystal in comparison with the behavior of Au(111) and Ni(111) in 10 mM KOH help separating surface and bulk contributions of nickel electrooxidation. This is especially relevant for small deposits with a high surface-to-bulk ratio. In addition, relations between the structure of the nickel electrodeposit and its electrochemical behavior are addressed.

[1] D. S. Hall et al., J. Electrochem. Soc. 160 (2003) 235–243.

[2] L. F. Huang et al., J. Phys. Chem. C 121 (2017) 782–9789.