Subject Area物理化学
Improving the Long-term Durability of PEMFC Cathode by Employing Pt/TiO2/C and Pt/IrO2/C Catalysts
Chen J(陈剑); Liu X(刘欣); Zhang L(张莉); Zhang HM(张华民)
Conference NameThe 60th Annual Meeting of the International Society of Electrochemistry
Conference Date2009-8-16
Conference Place中国
Funding Organizationthe International Society of Electrochemistry
AbstractThe long-term durability of the cathode catalyst is one of the most important issues for the widespread commercial application of PEMFCs. In this work, the catalysts Pt/TiO2/C and Pt/IrO2/C were prepared and served as the cathode electrocatalyst for PEMFC. The long-term durability of Pt/TiO2/C and Pt/IrO2/C catalysts was investigated both inside and outside a fuel cell by measuring single cell performance, CV curve and EIS. Meanwhile, the changes of the morphologies for the catalysts before and after the accelerating aging test (AAT) that conducted in an operated fuel cell were observed and recorded by TEM. The Pt/TiO2/C was prepared by a two-step method [1] using Ti(OBu)4 as the precursor, while the Pt/IrO2/C was prepared by incipient wetness technique [2]. The loading of Pt in both catalysts was 40wt.%. The long-term durability of both the home-made Pt/C catalyst and the commercial Pt/C catalyst(ETEK) was also tested for the comparison. There are two kinds of AAT tests employed in this work. One is to operate the single cell with potential sweep test in the potential range of +0.6 V to +1.2 V for 3000 cycles, and the other is to test the CV curves with the catalysts in 0.5M H2SO4 in the potential range of -0.25 V to +1.0 V for 1000 cycles. From the CV curves as shown in Fig. 1, it can be found that after the tests, the remained electrochemical active surface area (EAS) for Pt/TiO2/C and Pt/IrO2/C was 75.7% and 67.2%, respectively, which were obviously larger than the value of 42.6% for Pt/C catalyst. The phenomena indicated that the electroactivity of Pt/TiO2/C and Pt/IrO2/C are more stable than Pt/C when they were served as the cathode catalyst for PEMFC. The resistance of charge transfer (Rct) obtained from EIS also supported the experimental phenomena and the conclusions mentioned above. The morphologies of the catalysts before and after the AAT were observed and recorded by using TEM. After the tests, the obvious agglomeration and coalescence of Pt particles in the Pt/C catalyst were observed. The mean particle size of Pt in Pt/C increased from 5.3 nm to 26.5 nm with a broad size distribution. But for Pt/TiO2/C catalyst, after the test the mean particle size of Pt increased from 7.3 nm to 9.2 nm, which was much smaller than the value for that in Pt/C catalyst. In brief, the long-term durability of Pt/TiO2/C and Pt/IrO2/C as PEMFC cathode catalyst is obviously better than that of Pt/C catalyst.
Document Type会议论文
Corresponding AuthorChen J(陈剑)
Recommended Citation
GB/T 7714
Chen J,Liu X,Zhang L,et al. Improving the Long-term Durability of PEMFC Cathode by Employing Pt/TiO2/C and Pt/IrO2/C Catalysts[C],2009:12/1.
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