Fe2O3-encapsulated and Fe-Nx-containing hierarchical porous carbon spheres as efficient electrocatalyst for oxygen reduction reaction. (12th January 2022)

• Record Type: Journal Article
• Authors: Gan, Ruihui; Wang, Yali; Ma, Wenjun; Dirican, Mahmut; Zhao, Sa; Song, Yan; Zhang, Xiangwu; Ma, Chang; Shi, Jingli
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 4(2022)
• Page Start: 2103
• Page End: 2113
• Publication Date: 2022-01-12
• Subjects: Oxygen reduction reaction -- Multi-cage structures -- Fe2O3 nanoparticle -- Fe-Nx -- Rechargeable zinc-air battery; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.10.157
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: It is highly desirable to develop high-efficiency non-precious electrocatalysts toward oxygen reduction reaction (ORR). In this work, Fe2 O3 -encapsulated and Fe-Nx-containing porous carbon spheres (Fe2 O3 /N-MCCS) with unique multi-cage structures and high specific surface area (1360 m 2 g −1 ) are fabricated. The unique porous structure of Fe2 O3 /N-MCCS ensures fast transportation of oxygen during ORR. The combined effect of Fe2 O3 nanoparticles and Fe-Nx configurations endows Fe2 O3 /N-MCCS (E1/2 = 0.837 V vs. RHE) with superior ORR activity and methanol tolerance to Pt/C. And, Fe2 O3 /N-MCCS exhibits better stability than nitrogen-modified carbon. The characterization results of Fe2 O3 /N-MCCS after long-term test reveals its excellent structural stability. Impressively, zinc-air battery based on Fe2 O3 /N-MCCS showed a peak power density of 132.4 mW cm −2 and a specific capacity of 797 mAh g −1, respectively. Graphical abstract: Image 1 Highlights: Hierarchical porous multi-cage carbon spheres provide high-speed mass-transfer channels for ORR. Fe-Nx configurations and Fe2 O3 nanoparticles jointy promote ORR. Catalyzer exhibits excellent ORR activity, methanol resistance, and considerable stability. The Zn-air battery exhibits a peak power density of 132.4 mW cm −2 and a specific capacity of 797 mAh g −1 .