Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 259, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118042
Keywords
Direct methanol fuel cells; Electrocatalysts; Metal-organic frameworks; Oxygen reduction reaction; Atomically dispersed Fe atoms
Funding
- Key Program of the Chinese Academy of Sciences [KFZD-SW-419]
- National Natural Science Foundation of China [21503228]
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The rational design of highly efficient, low-cost and methanol-tolerant catalysts toward the oxygen reduction reaction (ORR) is urgently desired for the commercialization of direct methanol fuel cells (DMFCs). Herein, a novel Fe-N-C catalyst (ZIF/MIL-10-900) is derived from a mixture of ZIF-8 and MIL-101(Fe) and atomically dispersed FeN4 structures are confirmed by Mossbauer spectra and X-ray absorption spectroscopy. Study on the pyrolysis procedure reveals that Fe atoms in FeN4 are from MIL-101(Fe), while ZIF-8 acts as structural support and nitrogen sources. The as-prepared catalyst demonstrates a comparable ORR activity with the commercial Pt/ C possessing a half-wave potential (E-1/2) of 0.78 V in acids, in combination with excellent methanol tolerance and stability. One of the highest peak power density of 83 mW cm(-2) in DMFC (3 M CH3OH) by adopting ZIF/MIL-10-900 as cathode catalyst is obtained, which is 2.8-fold higher than that of the commercial Pt/C in the same operating condition.
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