Abstract
Platinum catalysts derived from MOF have shown excellent potential in oxygen reduction reaction (ORR) of fuel cells. In this paper, we applied a simple and efficient synthesis method to prepare ZIF-67-Rx(x = 0–4) with different sizes. Co@MOF-Rx(x = 0–4) skeleton supports with carbon nanotube structure were obtained by further pyrolysis. Pt/Co@MOF-Rx(x = 0–4) catalysts were synthesized by loading Co@MOF-Rx with 10% Pt. By changing the content of metal precursor, the nanometer size of ZIF-67-Rx was reduced from 722 nm to 93 nm. Pt/Co@MOF-Rx showed super high oxygen reduction activity and superior cycle stability. At 0.9 V, the mass activity(MA) and specific activity(SA) were 9.63 mA mgPt−1and 1.33 mA cm2, respectively, which were 1.54 and 1.23 times higher than those of Pt/C(20%). After 6000 cycles, it shows excellent stability than Pt/C(20%). This work brings new opportunities to design and prepare promising catalyst supports for proton exchange membrane fuel cells.
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