Abstract
AbstractHerein, a reduced Co3O4/C (rCo3O4/C) composite with rich oxygen vacancies has been fabricated through facile sodium borohydride reduction treatment to act as an effective promoter for Pt nanoparticles (NPs). The Pt NPs are highly dispersed onto the hybrid support with average size of 1.89 nm. Electrochemical measurements show that the Pt−rCo3O4/C‐2 h catalyst with abundant oxygen vacancies possesses better CO tolerance and stability and exhibits a higher mass activity (MA) of 1412 mA ⋅ mg−1(Pt) than that of pristine Co3O4/C supported Pt nanoparticles (Pt−pCo3O4/C) in acidic medium. The enhanced catalytic performance can be attributed to sodium borohydride reduction enriching the oxygen vacancies of Co3O4, which can generate a large amount of −OH species more easily via hydrolysis to oxidize CO species adsorbed on Pt surface to release Pt active sites. Consequently, the construction of oxygen vacancy‐rich materials as co‐catalysts can deliver excellent catalytic performance for Pt‐based electrocatalysts.
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