Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (9): 1727-1732.doi: 10.3866/PKU.WHXB201507161

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Synthesis of PDDA-Decorating MWCNTs Supported Pt Electrocatalysts and Catalytic Properties for Oxygen Reduction Reaction in Alkaline Medium

Jie. ZHANG,Mei-Ling. DOU,Feng. WANG*(),Jing-Jun. LIU,Zhi-Lin. LI,Jing. JI,Ye. SONG   

  • Received:2015-05-06 Published:2015-09-06
  • Contact: Feng. WANG E-mail:wangf@mail.buct.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(51125007)

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Abstract:

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.

Key words: Platinum, Poly(diallyldimethylammonium chloride), Multi-walled carbon nanotubes, Oxygen reduction reaction