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Acta Phys. -Chim. Sin.  2012, Vol. 28 Issue (10): 2263-2268    DOI: 10.3866/PKU.WHXB201208171
ELECTROCHEMISTRY AND NEW ENERGY     
Nanocomposite Cathode Catalyst with High Methanol Tolerance and Durability
ZHENG Ning, ZHU Chun-Mei, SUN Bin, SHI Zu-Jin, LIU Yan, WANG Yuan
Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
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Abstract  

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 wordsNanocomposite catalyst      Nitrogen-doped carbon nanohorns      Phthalocyanine      Durability      Methanol tolerance      Cathode of direct methanol fuel cells     
Received: 09 July 2012      Published: 17 August 2012
MSC2000:  O646.54  
Fund:  

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).

Cite this article:

ZHENG Ning, ZHU Chun-Mei, SUN Bin, SHI Zu-Jin, LIU Yan, WANG Yuan. Nanocomposite Cathode Catalyst with High Methanol Tolerance and Durability. Acta Phys. -Chim. Sin., 2012, 28(10): 2263-2268.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201208171     OR     http://www.whxb.pku.edu.cn/Y2012/V28/I10/2263

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