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Constructing Co-N-C Catalyst via a Double Crosslinking Hydrogel Strategy for Enhanced Oxygen Reduction Catalysis in Fuel Cells
- Source :
- Small (Weinheim an der Bergstrasse, Germany). 17(29)
- Publication Year :
- 2021
-
Abstract
- Exploiting platinum-group-metal (PGM)-free electrocatalysts with remarkable activity and stability toward oxygen reduction reaction (ORR) is of significant importance to the large-scale commercialization of proton exchange membrane fuel cells (PEMFCs). Here, a high-performance and anti-Fenton reaction cobalt-nitrogen-carbon (Co-N-C) catalyst is reported via employing double crosslinking (DC) hydrogel strategy, which consists of the chemical crosslinking between acrylic acid (AA) and acrylamide (AM) copolymerization and metal coordinated crosslinking between Co2+ and P(AA-AM) copolymer. The resultant DC hydrogel can benefit the Co2+ dispersion via chelated Co-N/O bonds and relieve metal agglomeration during the subsequent pyrolysis, resulting in the atomically dispersed Co-Nx/C active sites. By optimizing the ratio of AA/AM, the optimal P(AA-AM)(5-1)-Co-N catalyst exhibits a high content of nitrogen doping (12.36 at%) and specific surface area (1397 m2 g-1 ), significantly larger than that of the PAA-Co-N catalyst (10.59 at%/746 m2 g-1 ) derived from single crosslinking (SC) hydrogel. The electrochemical measurements reveal that P(AA-AM)(5-1)-Co-N possesses enhanced ORR activity (half-wave potential (E1/2 ) ≈0.820 V versus the reversible hydrogen electrode (RHE)) and stability (≈4 mV shift in E1/2 after 5000 potential cycles in 0.5 m H2 SO4 at 60 oC) relative to PAA-Co-N, which is higher than most Co-N-C catalysts reported so far.
- Subjects :
- Proton exchange membrane fuel cell
02 engineering and technology
010402 general chemistry
Electrochemistry
01 natural sciences
Catalysis
Biomaterials
Metal
chemistry.chemical_compound
Specific surface area
Copolymer
General Materials Science
Electrodes
Acrylic acid
Hydrogels
General Chemistry
021001 nanoscience & nanotechnology
Carbon
0104 chemical sciences
Oxygen
chemistry
Chemical engineering
visual_art
visual_art.visual_art_medium
Reversible hydrogen electrode
0210 nano-technology
Biotechnology
Subjects
Details
- ISSN :
- 16136829
- Volume :
- 17
- Issue :
- 29
- Database :
- OpenAIRE
- Journal :
- Small (Weinheim an der Bergstrasse, Germany)
- Accession number :
- edsair.doi.dedup.....ed8aef660072b4ce185296fb28245862