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Abstract
The development of effective oxygen electrode catalysts for renewable energy technologies such as metal-air batteries and fuel cells remains challenging. Here, we prepared a novel high-performance oxygen reduction reaction (ORR) catalyst comprised of Fe2N nanoparticles (NPs) in situ decorated over an N-doped porous carbon derived from pomelo peel (i.e., Fe2N/N-PPC). The decorated Fe2N NPs provided large quantities of Fe-N-C bonding catalytic sites. The as-obtained Fe2N/N-PPC showed superior onset and half-wave potentials (0.966 and 0.891 V, respectively) in alkaline media (0.1 M KOH) compared to commercial Pt/C through a direct four-electron reaction pathway. Fe2N/N-PPC also showed better stability and methanol tolerance than commercial Pt/C. The outstanding ORR performance of Fe2N/N-PPC was attributed to its high specific surface area and the synergistic effects of Fe2N NPs. The utilization of agricultural wastes as a precursor makes Fe2N/N-PPC an ideal non-precious metal catalyst for ORR applications.
Highlights
According to the United Nations, almost 140 billion metric tons of biomass is generated globally from agricultural wastes
The X-ray diffraction (XRD) patterns of Fe-pomelo peel-derived carbon (PPC) and Fe-N-doped pomelo peel-derived carbon (N-PPC) showed a broad peak at 23◦ a small shoulder peak at 43.3◦ assigned to the (002) (100) planes of graphite, respectively
The Fe-based NPs were accompanied by strong C signals, thereby demonstrating that these NPs were successfully loaded on the PPC material
Summary
According to the United Nations, almost 140 billion metric tons of biomass is generated globally from agricultural wastes. The valorization of biomass can potentially reduce the use of fossil fuels while mitigating greenhouse gas emissions [1]. Biomass wastes, such as bananas [2,3], tea leaves [4], poplar catkins [5], gingko leaves [6], coconut shells [1], eggshell membranes [7], and sodium alginate [8], have been increasingly used for fabricating carbon materials. Biomass raw materials can be used to synthesize carbon materials with a high surface area and porous structure This approach possesses several advantages (e.g., low cost, environmental friendliness, and convenience) over other routes employing different raw materials. Biomass-derived carbons have been employed as environmental adsorption materials [9] and lithium-ion battery anodes [10], among other uses [11]
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