Abstract
Development and design of low-cost and efficient cathode catalysts for the commercialization application implementation of high electrochemical performance aluminum-air (Al-air) battery will be of significant importance. Herein, we have synthesized nitrogen-doped carbon nanotube (N-CNT) supported Fe/Ce bimetallic catalyst (Fe/Ce-NCNT) by a chemical vapor deposition (CVD) strategy. Ce metal better catalyze the growth of carbon nanotubes, anchoring more iron atoms and increasing the number of Fe-NX active site. The Fe/Ce-NCNT-0.2 catalyst shows an excellent ORR ability (E1/2 = 0.88 V) in alkaline media, attributing to its high conductivity, hierarchical micropores/mesopores structure, abundant active sites. Moreover, the assembled aqueous Al-air battery with Fe/Ce-NCNT-0.2 exhibits a high performance with the power density of 164 mW cm−2 and energy density of 2409 Wh Kg−1 at 100 mA cm−2. The Fe/Ce-NCNT-0.2 possesses high voltage under high current density load, manifesting great commercial potential.
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