DOI number:10.1002/adma.202505781

Journal:Advanced Materials

Key Words:Xiandi Sun†, Jiashun Wu†, Tao Wang†, Xiao-Long Zhang, Pei Liu, Hongyu Sun, Hang Liu, Siyu Chen, Jia Ge, Tianrui Liu, Haibing Wei*, Chuan-Ling Zhang, Huai-Ping Cong, Zhenbin Wang*, Ya-Rong Zheng*, Min-Rui Gao*

Abstract:Ruthenium-based materials are promising alternatives to expensive platinum for the anodic hydrogen oxidation reaction (HOR) in anion exchange membrane fuel cells (AEMFCs), but face stability issues due to the strong oxophilicity. Here, an oxidation-resistant ruthenium multigrain catalyst is reported that exposes rich (10-11) facets for high-performing HOR catalysis in alkaline electrolytes. The catalyst exhibits a high kinetic current density of 61 mA cm−2 at an overpotential of 50 mV, which is 25.6- and 7.8-times higher than that of commercial ruthenium-carbon and platinum-carbon catalysts, respectively. Moreover, it also demonstrates a wide stability window up to 0.3 V versus the reverse hydrogen electrode and enhanced tolerance to carbon monoxide. An AEMFC containing this catalyst at the anode achieves peak power densities of 1.31 and 1.06 W cm−2 under hydrogen-oxygen and hydrogen-air conditions at 90 °C, respectively, and operates steadily. Experimental and theoretical studies reveal that the (10-11) facet possesses a higher oxidation barrier and lower hydrogen oxidation barrier than the common (0002) facets, enabling the exceptional HOR performances in alkali.

Indexed by:Journal paper

Page Number:e05781

Translation or Not:no

Date of Publication:2025-07-24

Included Journals:SCI