Raghuveer Vadari, Manthiram Arumugam, Bard Allen J
Materials Science and Engineering Program, The University of Texas at Austin, Austin, Texas 78712, USA.
J Phys Chem B. 2005 Dec 8;109(48):22909-12. doi: 10.1021/jp054815b.
The catalytic activity of carbon supported Pd-Co-Mo for the oxygen reduction reaction (ORR) in a single cell proton exchange membrane fuel cell (PEMFC) has been investigated at 60 degrees C and compared with data from commercial Pt catalyst and our previously reported Pd-Co-Au and Pd-Ti catalysts. The Pd-Co-Mo catalyst with a Pd:Co:Mo atomic ratio of 70:20:10 exhibits slightly higher catalytic activity like the Pd-Co-Au catalyst than the commercial Pt catalyst, but with excellent chemical stability unlike the Pd-Co-Au catalyst. The Pd-Co-Mo catalyst also exhibits better tolerance to methanol poisoning than Pt. Investigation of the catalytic activity of the Pd-Co-Mo system with varying composition and heat treatment temperature reveals that a Pd:Co:Mo atomic ratio of 70:20:10 with a heat treatment temperature of 500 degrees C exhibits the highest catalytic activity. Although the degree of alloying increases with increasing temperature from 500 to 900 degrees C as indicated by the X-ray diffraction data, the catalytic activity decreases due to an increase in particle size and a decrease in surface area.
在60摄氏度下研究了碳载Pd-Co-Mo在单电池质子交换膜燃料电池（PEMFC）中对氧还原反应（ORR）的催化活性，并与商业Pt催化剂以及我们之前报道的Pd-Co-Au和Pd-Ti催化剂的数据进行了比较。Pd:Co:Mo原子比为70:20:10的Pd-Co-Mo催化剂表现出略高于商业Pt催化剂的催化活性，与Pd-Co-Au催化剂类似，但与Pd-Co-Au催化剂不同的是，它具有优异的化学稳定性。Pd-Co-Mo催化剂对甲醇中毒的耐受性也比Pt更好。对不同组成和热处理温度的Pd-Co-Mo体系催化活性的研究表明，热处理温度为500摄氏度、Pd:Co:Mo原子比为70:20:10时表现出最高的催化活性。尽管如X射线衍射数据所示，随着温度从500摄氏度升高到900摄氏度，合金化程度增加，但由于粒径增大和表面积减小，催化活性降低。
