Heterostructure formation and chemical modulation of colloidal Au–Co–Fe nanoparticles for alkaline water oxidation

• DOI: 10.1111/jace.20665
• Publication Date: 2025-05-20T11:35:52Z
• Authors: Gyuhyeon Kim; Wooseok Jeong; Hyeonseok Lee; Yeongbin Lee; Heesoo Jeong; Don‐Hyung Ha
• Keywords: Alkaline earth metal

Abstract Heterostructure engineering is an effective strategy for designing high‐performance electrochemical catalysts by enhancing conductivity and inducing charge transfer at the interface. Several studies have been conducted to control morphology of heterostructured nanoparticles (NPs); however, on three‐metal systems are lacking. In this study, we developed a morphology‐controllable synthesis method (Au, Co, Fe) catalysts, including Au–CoFe 2 O 4 heterodimers Au–Co 0.75 Fe 0.25 core–shell NPs. Oxygen evolution reaction (OER) performance measurements revealed that heterodimer NPs possessed superior catalytic activity compared CoFe NPs, requiring 297.14 mV overpotential current density 100 mA/cm . addition, displays Tafel slope value 39.93 mV/dec exhibits no noticeable degradation 50 h stability test The enhanced may be attributed electronic structure modulation induced high electronegativity Au suppression leaching during OER. This provides with diverse compositions can contribute design catalysts.