Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 590, Issue -, Pages 622-631Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.01.097
Keywords
Metal-organic frameworks; Nitrogen doping; Co3Fe7 alloys; Carbon network; Oxygen reduction
Categories
Funding
- National Key Research and Development Program of China [2018YFB1502903]
- Zhejiang Provincial Natural Science Foundation of China [LQ20E030016, LY19B060006]
- National Natural Science Foundation of China [21103024, 21603072, 61171008]
- Technology Development Project of Jiaxing University
- G60 STI Valley Industry & Innovation Institute, Jiaxing University
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In this study, nitrogen-doped Fe/Co bimetallic electrocatalysts were prepared using adjusted metal-organic frameworks, showing excellent oxygen reduction reaction (ORR) activity and methanol crossover tolerance. The desirable performance is attributed to the uniform distribution of Co3Fe7 active sites, electron density modification, and hierarchical pore structure with large surface area.
Sufficient and well-distributed active sites and highly conductive carbon matrix are two important factors to achieve highly efficient electrocatalysts. In this study, we report an adjusted metal-organic frameworks (MOF)-based route for the preparation of nitrogen-doped Fe/Co bimetallic electrocatalysts. With suitable Fe/Co molar ratio (Fe/Co = 1/4.15), Co nanoparticles (NPs) with mild oxidation state and Co3Fe7 alloys wrapped with thin graphene layers are embedded in an integrated and continuous carbon network. The corresponding FC@NCs-4.15 catalyst exhibits excellent oxygen reduction reaction (ORR) activity (onset potential (E-onset) of 0.94 V and half-wave potential (E-1/2) of 0.84 V vs RHE) in alkaline medium, close to commercial Pt/C and superior to the other two FC@NCs. The desirable ORR performance results from the uniform distribution Co3Fe7 active sites, electron density modification from Co NPs to surrounding carbon layers, hierarchical pore structure with large surface area, low carbon content, high pyridinic and graphitic N components. The FC@NCs-4.15 also displays satisfactory methanol crossover tolerance and durability. (C) 2021 Elsevier Inc. All rights reserved.
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