Work

Hydroxyl Spillover Activated from the Strongly Coupled Ru@Mn 3 O 4 Heterostructure to Promote Alkaline Hydrogen Evolution

Year: 2025

Type: article

Abstract: Alkaline hydrogen evolution reaction (HER) has great potential in practical hydrogen production. However, constructing an excellent catalyst with advantages of both superior water dissociation ability and easy OH * desorption remains urgently needed and yet challenging for the alkaline HER. Herein, superior water dissociation process, facile OH * desorption, and optimized H adsorption are realized on a strongly coupled heterostructure of Ru@Mn 3 O 4 , in which Ru clusters are decorated on Mn 3 O 4 via Ru─O─Mn bonds. The highly oxophilic Mn 3 O 4 facilitates the water dissociation, whereas the formed heterointerface can efficiently desorb OH * via hydroxyl spillover effect and optimize H adsorption. Consequently, the Ru@Mn 3 O 4 presents remarkable HER performance with a low overpotential of 17 mV at 10 mA cm −2 and Tafel slope of 30 mV dec −1 , surpassing recently reported Ru‐based catalysts and commercial Pt/C. More importantly, the mass activity (MA) and turnover frequency (TOF) of the Ru@Mn 3 O 4 increase about 11‐ and 8‐fold, respectively, compared to Pt/C at 100 mV in 1.0 M KOH. This study provides a new strategy for designing high‐performance HER catalysts and enhancing the catalytic performance through hydroxyl spillover effect and sheds a light on understanding the HER mechanism.

Source: Angewandte Chemie International Edition

DOI: 10.1002/anie.202504667