Journal
CHEMICAL ENGINEERING JOURNAL
Volume 423, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130241
Keywords
Oxygen reduction; Fuel cell; Cross-linking strategy; Metal organic frameworks
Categories
Funding
- National Natural Science Foundation of China [22075102, 22005120, 21576301, 51973244]
- NaturalScience Foundation of Guangdong Province, China [2017A030313048]
- Fundamental Research Funds for the Central Universities [21619317, 21620329]
- Postdoctoral Research Foundation of China [2020M673071]
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This work presents the development of carbon nanotube cross-linking MOF-derived Fe/N/C catalysts for oxygen reduction electrocatalysis in fuel cells. The strategy improved activity and stability by offering convenient electron conduction channels, and identified low-spin D1-FeIIN4 and high-spin D3-N-FeN4 as the main active sites. The novel catalyst achieved high performance of 0.732 A cm-2 at 0.7 V, shedding light on the development of non-precious metal catalysts for fuel cells.
In this work, we report our recent efforts in developing carbon nanotube cross-linking MOF-derived Fe/N/C catalysts as oxygen reduction electrocatalysts for fuel cell. It is witnessed that the carbon nanotube cross-linking strategy can effectively improve the activity and stability of fuel cell, which can be assigned to its fast and convenient electron conduction channels offered by loosely cross-linked carbon nanotubes. The results of 57Fe Mo center dot ssbauer spectroscopy show that there are three spin states of Fe-N4 structure in the material, of which lowspin state D1-FeIIN4 and high-spin state D3-N-FeN4 are both considered to be the main active sites of oxygen reduction reaction. For fuel cell, high performance of 0.732 A cm-2 at 0.7 V is reached. The novel cross-linking catalyst sheds light on the development of non-precious metal catalysts for fuel cells.
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