Platinum-rare earth intermetallic alloys as anode electrocatalysts for borohydride oxidation

被引：36
|
作者：
Santos, D. M. F. [1 ]
Saturnino, P. G. [1 ]
Maccio, D. [2 ]
Saccone, A. [2 ]
Sequeira, C. A. C. [1 ]
机构：
[1] Univ Tecn Lisboa, Inst Super Tecn, Inst Mat & Surfaces Sci & Engn, Mat Electrochem Grp, P-1049001 Lisbon, Portugal
[2] Univ Genoa, DCCI, I-16146 Genoa, Italy
来源：
CATALYSIS TODAY | 2011年 / 170卷 / 01期
关键词：
Sodium borohydride; Oxidation; Platinum-rare earth intermetallics; Cyclic voltammetry; Chronopotentiometry; Direct borohydride fuel cells; METAL CRYSTALLINE ALLOYS; HYDROGEN STORAGE ALLOY; PEM FUEL-CELLS; SODIUM-BOROHYDRIDE; ELECTROCHEMICAL OXIDATION; DIFFUSION-COEFFICIENT; LNPT(2) LN; R R; GOLD; ELECTRODES;
D O I：
10.1016/j.cattod.2011.03.037
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Sodium borohydride (NaBH4) is being actively investigated as an anodic fuel for direct borohydride fuel cells. Platinum (Pt) displays a rather good borohydride (BH4-) oxidation activity but its catalytic effect towards the BH4- hydrolysis leads to an overall number of exchanged electrons in the oxidation process, n, between 2 and 4. The doping of Pt with rare earth (RE) elements may decrease or increase the BH4- hydrolysis, thereby increasing or decreasing the n value. Among other factors, these changes will depend on the composition of the alloying elements as well as on the applied anodic potential range. In this paper, Pt and three Pt-RE intermetallic alloy (Pt-Ho, Pt-Sm, and Pt-Ce) electrodes are studied by cyclic voltammetry (CV) and chronopotentiometry (CP) in the temperature range 25-55 degrees C. Modelling of CV and CP data indicate that these Pt-RE electrodes do not show enhanced performance for the BH4- oxidation in comparison to the single Pt electrocatalyst. Of the Pt alloys, the Pt-Ho shows the highest catalytic activity for the BH4- oxidation reaction and the Pt-Ce the worst. Relevant kinetic parameters (n, alpha, k(s)) are also estimated. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：134 / 140
页数：7
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