Co-Zn-MOFs Derived N-Doped Carbon Nanotubes with Crystalline Co Nanoparticles Embedded as Effective Oxygen Electrocatalysts

The oxygen reduction reaction (ORR) is a crucial step in fuel cells and metal-air batteries. It is necessary to expand the range of efficient non-precious ORR electrocatalysts on account of the low abundance and high cost of Pt/C catalysts. Herein, we synthesized crystalline cobalt-embedded N-doped...

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Published inNanomaterials (Basel, Switzerland) Vol. 11; no. 2; p. 261
Main Authors Zhang, Wendi, Liu, Xiaoming, Gao, Man, Shang, Hong, Liu, Xuanhe
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 20.01.2021
MDPI
Subjects
Annealing
Batteries
Carbon
Carbon nanotubes
Catalysts
Chemical reduction
Chemical synthesis
Cobalt
Crystal structure
Crystallinity
Electrocatalysts
Electrodes
Electrolytes
Electrolytic cells
Ethanol
Fuel cells
Fuel technology
High temperature
Ion diffusion
Metal-organic frameworks
Morphology
N-doped carbon
Nanoparticles
Nanotechnology
Nanotubes
Oxygen
oxygen reduction reaction
Oxygen reduction reactions
Platinum
Scanning electron microscopy
Thermogravimetric analysis
Ultrasonic imaging
Voltammetry
Zinc
United States > US
Germany
oxygen reduction reaction
N-doped carbon
metal-organic frameworks
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Summary:The oxygen reduction reaction (ORR) is a crucial step in fuel cells and metal-air batteries. It is necessary to expand the range of efficient non-precious ORR electrocatalysts on account of the low abundance and high cost of Pt/C catalysts. Herein, we synthesized crystalline cobalt-embedded N-doped carbon nanotubes (Co@CNTs-T) via facile carbonization of Co/Zn metal-organic frameworks (MOFs) with dicyandiamide at different temperatures (t = 600, 700, 800, 900 °C). Co@CNTs- 800 possessed excellent ORR activities in alkaline electrolytes with a half wave potential of 0.846 V vs. RHE (Reversible Hydrogen Electrode), which was comparable to Pt/C. This three-dimensional network, formed by Co@CNTs-T, facilitated electron migration and ion diffusion during the ORR process. The carbon shell surrounding the Co nanoparticles resulted in Co@CNTs-800 being stable as an electrocatalyst. This work provides a new strategy to design efficient and low-cost oxygen catalysts.
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ISSN:2079-4991
2079-4991
DOI:10.3390/nano11020261