Tuning the Hydrogen Evolution Activity of Co₂NiO₄ via Precursor-Controlled Synthesis.

ABSTRACT: The realization of efficient and durable earth-abundant electrocatalysts for alkaline hydrogen evolution reaction (HER) is critical for scalable hydrogen production, yet remains limited by insufficient intrinsic activity. Herein, we demonstrate a precursor-controlled hydrothermal strategy that enables precise morphology and surface-state regulation of spinel Co₂NiO₄ directly grown on nickel foam, allowing a clear correlation between catalyst architecture and HER performance. By replacing urea with hexamethylenetetramine, an ultrathin, highly interconnected two-dimensional nanosheet network (CNO-HT) is obtained, which promotes efficient electron transport, rapid electrolyte penetration, and maximized exposure of catalytically active sites. Structural and spectroscopic

SUBMITTER: Ahmed ATA 

PROVIDER: S-EPMC12897932 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature