Comparative Study of Pt/CeO2-CNTs and PtRu/C as Methanol  Electro-oxidation Catalysts

Acta Chimica Sinica ›› 2009, Vol. 67 ›› Issue (5): 361-366. Previous Articles Next Articles

Original Articles

甲醇电氧化催化剂Pt/CeO2-CNTs与PtRu/C的比较研究

王建设*,a,b 王留成a 赵建宏a 宋成盈a 邱新平*,b 陈立泉b

(a郑州大学化工学院郑州 450000)
(b清华大学化学系北京 100084)

投稿日期:2008-07-13 修回日期:2008-10-10 发布日期:2009-03-14
通讯作者: 王建设

Comparative Study of Pt/CeO2-CNTs and PtRu/C as Methanol Electro-oxidation Catalysts

Wang, Jianshe ^*,a,b Wang, Liucheng ^a Zhao, Jianhong ^a

Song, Chengying ^a
Qiu, Xinping ^*,b Chen, Liquan ^b

(a School of Chemical Engineering, Zhengzhou University, Zhengzhou 450000)
(b Department of Chemistry, Tsinghua University, Beijing 100084)

Received:2008-07-13 Revised:2008-10-10 Published:2009-03-14
Contact: Wang, Jianshe

Abstract

To gain insight into the catalytic and structural properties of as-prepared Pt/CeO2-CNT and as-received PtRu/C (E-TEK), CO stripping and constant potential electro-oxidation of CO ad-layer were conducted with Pt/CeO2-CNT and PtRu/C. Besides, cyclic voltammetry (CV) scanning and constant potential electro-oxidation of methanol were conducted as comparison. Tests with CO electro-oxidation indicated that CO ad-layer was more readily electro-oxidized on PtRu/C than on Pt/CeO2-CNT while tests with methanol electro-oxidation showed that Pt/CeO2-CNT and PtRu/C exhibited nearly the same apparent activity. To probe the structural reason behind this discrepancy, cyclic voltammetry scanning and CO stripping methods were applied to PtRu/C. Analysis based on experimental results indicates that the structural reason for the not-so-high-as-expected activity for methanol electro-oxidation on PtRu/C lies in two aspects: one is the limited specific area of Pt and the other is the decreased Pt-Ru interfaces due to Ru dissolution. The study showed that simultaneously increasing the specific area of Pt and Pt-Ru interfaces was significant for effective co-catalysis of Ru, the intrinsically more active component toward CO and methanol electro-oxidation.

Key words: direct methanol fuel cell, methanol electro-oxidation, co-catalysis, Pt/CeO2-CNTs, PtRu/C

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甲醇电氧化催化剂Pt/CeO2-CNTs与PtRu/C的比较研究

Comparative Study of Pt/CeO2-CNTs and PtRu/C as Methanol Electro-oxidation Catalysts

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