A comparative study of PtCo, PtCr, and PtCoCr catalysts for oxygen electro-reduction reaction
A comparative study of PtCo, PtCr, and PtCoCr catalysts for oxygen electro-reduction reaction
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DOI：
10.1016/j.electacta.2010.04.056
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发表时间：
2010-07-30
影响因子：
6.6
通讯作者：
McGinn, Paul J.
中科院分区：
文献类型：
--
作者：
Jeon, Min Ku;Zhang, Yuan;McGinn, Paul J.
对碳负载的Pt30Co70、Pt30Cr70和Pt30Co30Cr40催化剂的氧电还原活性进行了比较研究。在NaBH4还原合成的合金催化剂中，ORR比活性比铂/碳催化剂提高了3倍以上，而质量活性没有明显提高。在900℃还原条件下热处理后，合金催化剂的ORR比活性增加，其ORR相对活性排序为：PtCo/C-900(2800亩A厘米(铂)(-2))>；PtCoCr/C-900(1770亩A厘米(铂)(-2))>；PTCR/C-900(871亩A厘米(铂)(-2))>；铂/C-900(393亩A厘米(铂)(-2))>；铂/C(334亩A厘米(铂)(-2))。另一方面，ORR质量活度的大小顺序为PTCR/C-900(140 mA mg(铂)(-1))和GT；PtCoCr/C-900(111 mA mg(铂)(-1))和GT；PtCo/C-900(84.1 mA mg(铂)(-1))。循环伏安结果表明，在PTCR/C-900催化剂中，虽然它的比活性最低，但它具有较大的电化学活性比表面积，产生了较高的质量活性。PtCoCr/C-900催化剂的中间EAS和ORR活性表明，PtCo/C-900(低质量高比活性)和PTCR/C-900(高质量低比活性)的特点是通过将铂与钴和铬合金化而结合在一起的。(C)2010爱思唯尔有限公司。保留所有权利。
A comparative study of carbon supported Pt30Co70, Pt30Cr70, and Pt30Co30Cr40 catalysts for oxygen electro-reduction reaction (ORR) activity was performed. In alloy catalysts synthesized via NaBH4 reduction, more than a 3-fold improvement was observed in ORR specific activity compared with that of Pt/C catalyst, while mass activities did not show significant improvement. After annealing at 900 degrees C under reducing conditions, the ORR specific activities of the alloy catalysts increased to give a relative ORR catalytic activity ordering of PtCo/C-900 (2800 mu A cm(Pt)(-2)) > PtCoCr/C-900 (1770 mu A cm(Pt)(-2)) > PtCr/C-900 (871 mu A cm(Pt)(-2))> Pt/C-900 (393 mu A cm(Pt)(-2)) > Pt/C (334 mu A cm(Pt)(-2)). On the other hand, the ORR mass activity followed an order of PtCr/C-900 (140 mA mg(Pt)(-1)) > PtCoCr/C-900 (111 mA mg(Pt)(-1))> PtCo/C-900 (84.1 mA mg(Pt)(-1)). Cyclic voltammetry results suggest that incorporation of Cr resulted in a large electrochemically active surface area producing higher mass activity in the PtCr/C-900 catalyst although it showed the lowest specific activity among the alloy catalysts. The intermediate EAS and ORR activity values of the PtCoCr/C-900 catalyst suggest that the characteristics of the PtCo/C-900 (low mass and high specific activities) and PtCr/C-900 (high mass and low specific activities) are combined by alloying of Pt with both Co and Cr. (C) 2010 Elsevier Ltd. All rights reserved.