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Title: Highly efficient nonprecious metal catalyst prepared with metal–organic framework in a continuous carbon nanofibrous network

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

Fuel cell vehicles, the only all-electric technology with demonstrated >300 miles/fill travel range, use platinum as the electrode catalyst. The high price of Pt creates a major cost barrier for large-scale implementation of proton exchange membrane fuel cells. Non-precious metal catalysts (NPMCs) represent attractive low-cost alternatives. However, a significantly lower turn-over frequency at the individual catalytic site renders the traditional carbon-supported NPMCs inadequate in reaching the desired performance afforded by Pt. Unconventional catalyst design aiming at maximizing the active site density at much improved mass and charge transports is essential for the next-generation NPMC. We report here a new method of preparing highly efficient, nanofibrous NPMC for cathodic oxygen reduction reaction by electrospinning a polymer solution containing ferrous organometallics and zeolitic imidazolate framework followed by thermal activation. The new catalyst offers a carbon nano-network architecture made of microporous nanofibers decorated by uniformly distributed high density active sites. In a single-cell test, the membrane electrode containing such catalyst delivered an unprecedented volumetric activities of 3.3 A cm-3 at 0.9V or 450 A cm-3 extrapolated at 0.8 V, representing the highest reported value in the literature. Significantly improved fuel cell durability was also observed.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Fuel Cell Technologies (FCTO); USDOE Office of Science (SC)
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1392082
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 34; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English

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