Promoting effects of La for improved oxygen reduction activity and high stability of Pt on Pt–La alloy electrodes
Promoting effects of La for improved oxygen reduction activity and high stability of Pt on Pt–La alloy electrodes
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DOI：
10.1039/c2ee02691k
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发表时间：
2012-05
影响因子：
32.5
通讯作者：
S. Yoo;S. Hwang;June-Gunn Lee;Seung-Cheol Lee;T. Lim;Y. Sung;A. Wiȩckowski;Soo‐Kil Kim
中科院分区：
文献类型：
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作者：
S. Yoo;S. Hwang;June-Gunn Lee;Seung-Cheol Lee;T. Lim;Y. Sung;A. Wiȩckowski;Soo‐Kil Kim
聚合物电解质燃料电池电催化剂的设计取决于两个同样重要的基本原则：电催化活性的优化以及在操作条件下的长期稳定性（例如，pH 0.8V）。具有过渡金属的Pt基合金（即，Pt-La）解决了这两个关键问题。氧还原动力学取决于合金的组成，而合金的组成又与d带中心位置有关。氧还原反应的稳定性可通过Pt-M（M = Ti，Fe，Zr和La）的d带填充和空位的相关性来预测。
The design of polymer electrolyte fuel cell electrocatalysts depends on two equally important fundamental principles: the optimization of electrocatalytic activities as well as the long-term stability under operating conditions (e.g., pH 0.8 V). Pt-based alloys with transition metals (i.e., Pt–La) address both of these key issues. The oxygen reduction kinetics depends on the alloy composition which, in turn, is related to the d-band center position. The stability of the oxygen reduction reaction is predictable by correlation of the d-band fillings and vacancies of Pt–M (M = Ti, Fe, Zr and La).