Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (10): 2263-2268.doi: 10.3866/PKU.WHXB201208171

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Nanocomposite Cathode Catalyst with High Methanol Tolerance and Durability

ZHENG Ning, ZHU Chun-Mei, SUN Bin, SHI Zu-Jin, LIU Yan, WANG Yuan   

  1. Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2012-07-09 Revised:2012-08-16 Published:2012-09-26
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20803001, 20973003, 51121091, 21133001), and National Key Basic Research Special Foundation of China (2011CB808702).


We report the preparation, characterization and elelctrocatalytic properties of a novel nanocomposite cathode catalyst (TiOPc-Pt/NSWCNH) which is assembled using Pt nanoclusters, TiOPc nanocrystal, and nitrogen-doped single walled carbon nanohorns (NSWCNHs) as building blocks. TiOPc-Pt/NSWCNH is characterized by inserting most of the Pt nanoparticles in nano-networks formed by stacking of NSWCNHs, and contacting of a part of the Pt nanoparticles with TiOPc nanocrystals. TiOPc-Pt/NSWCNH exhibits high electrocatalytic activity, excellent selectivity and durability for oxygen reduction reaction (ORR) in the presence of methanol. In an O2-saturated HClO4 aqueous solution containing methanol (0.5 mol·L-1), the onset potential over the TiOPc-Pt/NSWCNH catalyst shifted by more than 260 mV toward positive relative to that over a commercial Pt/C-JM catalyst. The mass activity and specific activity for ORR over TiOPc-Pt/NSWCNH at 0.85 V (versus a reversible hydrogen electrode (RHE)) was 83.5 A·g-1 and 0.294 mA·cm-2, respectively, which were much higher than those of Pt/C-JM. Cyclic voltammetry accelerated aging tests (0.6-1.0 V for 15000 cycles) in an O2-saturated HClO4 aqueous solution containing methanol revealed that TiOPc-Pt/NSWCNH possessed a higher durability compared to TiOPc-Pt/C. The high methanol tolerance of TiOPc-Pt/NCNH may be mainly derived from the electron transfer from TiOPc nanocrystals to Pt nanoparticles. The nano-network and the high graphitization degree of NSWCNHs are responsible for the excellent durability of TiOPc-Pt/NSWCNH.

Key words: Nanocomposite catalyst, Nitrogen-doped carbon nanohorns, Phthalocyanine, Durability, Methanol tolerance, Cathode of direct methanol fuel cells