Citation: ZHANG Jie, DOU Mei-Ling, WANG Feng, LIU Jing-Jun, LI Zhi-Lin, JI Jing, SONG Ye. Synthesis of PDDA-Decorating MWCNTs Supported Pt Electrocatalysts and Catalytic Properties for Oxygen Reduction Reaction in Alkaline Medium[J]. Acta Physico-Chimica Sinica, ;2015, 31(9): 1727-1732. doi: 10.3866/PKU.WHXB201507161
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Multi-walled carbon nanotubes (MWCNTs) were modified with the long-chain polymer poly (diallyldimethylammonium chloride) (PDDA) and used as support for Pt nanoparticles (NPs). Pt/PDDA/ MWCNTs electrocatalysts were prepared by electrostatic adsorption of Pt NPs on the PDDA/MWCNTs support. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) characterization revealed that the Pt NPs were well dispersed on the PDDA/MWCNTs support, with an average diameter of ~3.6 nm. Thermo gravimetric analysis showed that the loading of Pt was 36%(w). Rotating disk electrode (RDE) measurements showed that the Pt/PDDA/MWCNTs catalyst had excellent electrocatalytic activity for oxygen reduction in alkaline medium. Compared with commercial Pt/C (40%(w)), the Pt/PDDA/MWCNTs catalyst exhibited a positive shift of 30 mV for the oxygen reduction onset and half-wave potential. Kinetics study further confirmed the significantly enhanced oxygen reduction activity of the Pt/PDDA/MWCNTs catalyst in the alkaline medium.
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