Identical-location SEM/EBSD reveals different microstructure-dependent reconstruction of Fe, Co, and Ni electrodes during alkaline oxygen evolution reaction

2026-08-04

Madis Lüsi

Luka Suhadolnik

Črtomir Donik

Irena Paulin

Angelja Kjara Šurca

Martin Šala

Marjan Bele

Nejc Hodnik *

DOI：10.1016/j.electacta.2026.149681

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Abstract

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• IL-SEM/EBSD links OER reconstruction to grain orientation and strain. • Fe shows grain-dependent dissolution and patchy passivation. • Co reconstructs by dissolution–redeposition into oxygen-rich platelets. • Ni forms grain-boundary-promoted porous Fe-containing Ni-based oxyhydroxide. • Microstructure controls alkaline OER activation in Fe and Ni.

Keywords:

Electrocatalysis

Alkaline oxygen evolution reaction

Surface reconstruction

Identical location electron microscopy

Ni oxyhydroxide

Identical-location SEM/EBSD reveals different microstructure-dependent reconstruction of Fe, Co, and Ni electrodes during alkaline oxygen evolution reaction

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