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Title: Modular Iron–Bipyridine-Based Conjugated Aerogels as Catalysts for Oxygen Reduction Reaction

Journal Article · · ACS Catalysis
 [1];  [2];  [2]; ORCiD logo [3];  [4]; ORCiD logo [2]
  1. Bar-Ilan Univ., Ramat Gan (Israel); Israel Atomic Energy Commission (IAEC), Yavne (Israel). Soreq Nuclear Research Centre (Soreq NRC)
  2. Bar-Ilan Univ., Ramat Gan (Israel)
  3. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  4. Israel Atomic Energy Commission (IAEC), Yavne (Israel). Soreq Nuclear Research Centre (Soreq NRC)

Aerogels have a large surface area and a porous structure, which make them an attractive catalyst support materials for fuel cells. Modifying the aerogels’ building blocks and introducing catalytic sites into their backbones allow them to function as both catalysts and supports, thereby increasing the density and distribution of catalyst active sites. In this work, we studied conjugated aerogels containing iron–bipyridine catalytic sites for the oxygen reduction reaction. To demonstrate the variation in physical and electrochemical properties of these aerogels, a series of aerogels were synthesized by a Glaser coupling reaction. Iron salt was added to the three-dimensional gel to produce iron–bipyridine complexes and obtain atomically dispersed catalytic sites. The electrocatalytic activity and electrical conductivity of the aerogels were increased after their heat treatment to yield Fe-doped carbon aerogels. The control of metal loadings was accomplished by changing the bipyridine content during the aerogel synthesis, resulting in 0.9–4.1 wt % Fe. In conclusion, the results show a correlation between Fe loading, aerogel structure, and catalytic activity, achieving high performance for the oxygen reduction reaction in both acidic and alkaline media.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2281115
Journal Information:
ACS Catalysis, Vol. 13, Issue 21; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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