Carbon and binder free rechargeable Li–O2 battery cathode with Pt/Co3O4 flake arrays as catalyst

Abstract Pt nanoparticles modified Co 3 O 4 flake arrays are prepared by an electrochemically assisted method and the subsequent cool sputtering, a carbon and binder free approach. When used as the cathode catalysts of Li–O 2 batteries, these porous films supply the O 2 transport adequate channels by the macropores surrounded by Co 3 O 4 flakes, which endow the cathodes stable two-phase interface in discharge/charge processes. The superior ability of Pt catalyzing O 2 evolution leads the batteries showing a much lower overpotential (3.2 V) in charge process compared with those using pristine Co 3 O 4 arrays as catalysts (4.0 V). The enhancement of decomposing the discharging precipitate promotes the Li–O 2 batteries' reversibility obviously, which realize more than 30 discharge/charge cycles.

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