Defect-enriched, active, self-supporting, coralline-like, high-entropy spinel oxide (FeNiCoMnCr) 3 O 4 electrodes for high-stability oxygen evolution reaction

This work reports a self-supporting high-entropy spinel oxide (FeNiCoMnCr) 3 O 4 electrode, whose abundant oxygen vacancies promote OER intermediates adsorption and reduce energy barrier of the *O formation step, showing the excellent OER performance.