Iron Integration in Nickel Hydroxide Matrix vs Surface for Oxygen-Evolution Reaction: Where the Nernst Equation Does Not Work

• DOI: 10.1021/acs.jpclett.4c00604
• Publication Date: 2024-03-25T20:23:02Z
• Authors: Mohammad Saleh Al...; Subhajit Nandy; Keun Hwa Chae; Mohammad Mahdi Na...
• Keywords: Oxygen evolution; Matrix (chemical analysis); Nickel oxide

This study focuses on the oxygen-evolution reaction (OER) activity comparison between two forms of NiFe (hydr)oxides: compound 1, where Fe ions are applied surface nickel (hydr)oxide, and 2, with incorporated into structural matrix (hydr)oxide. The observed exponential link Coulombic energy total charge system points to a direct proportionality potential concentration oxidized (e.g., V ∝ [oxidized Ni]), diverging from logarithmic relationship outlined in Nernst equation or its modifications, which is not evident this case. Initial visible spectroscopy indicates notable trend toward oxidation. As, during oxidation, more Ni oxidized, repulsion effect develops, diminishing likelihood further distinct linear correlation emerges quantity Ni(II) potentials.