Journal
NANOMATERIALS
Volume 12, Issue 19, Pages -Publisher
MDPI
DOI: 10.3390/nano12193306
Keywords
secondary-heteroatom-doping; graphene nanoribbons; unzipping; oxygen reduction reaction
Categories
Funding
- National Natural Science Foundation of China [51972150]
- China Postdoctoral Science Foundation [2020M671357]
- Natural Science Foundation of the Jiangsu Province [BK20210780]
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In this study, an efficient metal-free catalyst consisting of N, S co-doped graphene nanoribbons (N, S-GNR-2s) was developed for oxygen reduction reactions (ORRs). The catalyst exhibited better ORR property compared to the control samples.
The rareness and weak durability of Pt-based electrocatalysts for oxygen reduction reactions (ORRs) have hindered the large-scale application of fuel cells. Here, we developed an efficient metal-free catalyst consisting of N, S co-doped graphene nanoribbons (N, S-GNR-2s) for ORRs. GNRs were firstly synthesized via the chemical unzipping of carbon nanotubes, and then N, S co-doping was conducted using urea as the primary and sulfourea as the secondary heteroatom sources. The successful incorporation of nitrogen and sulfur was confirmed by elemental mapping analysis as well as X-ray photoelectron spectroscopy. Electrochemical testing revealed that N, S-GNR-2s exhibited an E-onset of 0.89 V, E-1/2 of 0.79 V and an average electron transfer number of 3.72, as well as good stability and methanol tolerance. As a result, N, S-GNR-2s displayed better ORR property than either N-GNRs or N, S-GNRs, the control samples prepared with only a primary heteroatom source, strongly clarifying the significance of secondary-heteroatom-doping on enhancing the catalytic activity of carbon-based nanomaterials.
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