کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1292535 | 973390 | 2006 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Multi-scale dispersion in fuel cell anode catalysts: Role of TiO2 towards achieving nanostructured materials
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Multi-scale dispersion in fuel cell anode catalysts: Role of TiO2 towards achieving nanostructured materials Multi-scale dispersion in fuel cell anode catalysts: Role of TiO2 towards achieving nanostructured materials](/preview/png/1292535.png)
چکیده انگلیسی
Multi-scale dispersion involving dispersion of catalyst particles on carbon support as well as intra-particle dispersion within the particles of a ternary Pt-Ru-Ti/C catalyst has been demonstrated. The presence of TiO2 can dramatically decreases the grain size of the obtained catalyst to about 1-2Â nm when compared with similarly prepared Pt-Ru/C (3-4Â nm) catalyst indicating that TiO2 can enhance the dispersion of the catalyst particles on carbon support. The structure and distribution of the Pt-Ru-Ti/C catalyst nanoparticles has been studied from high angle annular dark-field (HAADF) images combining with energy-dispersive X-ray spectroscopy (EDX). The composition of the Pt-Ru-Ti/C was found to be 50:34:16 (Pt:Ru:Ti, at%). The role of TiO2 in improving the intra-particle distribution has been investigated by X-ray absorption spectroscopy (XAS) at extended X-ray absorption fine structure region (EXAFS). The XAS parameters suggest that the Pt-Ru-Ti/C catalyst possess a structure in which the core is rich in Pt-Ru alloy and the shell is rich in Pt. In the shell, the Pt, Ru and TiO2 species are distributed homogenously. As a result of the improved multi-scale dispersion, the Pt-Ru-Ti/C catalyst exhibited enhanced activity towards methanol oxidation when compared to the commercial E-TEK 30 Pt-Ru/C catalyst and shows nearly similar performance when compared to the commercial JM 30 Pt-Ru/C catalyst with promising applications in fuel cells.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 159, Issue 1, 13 September 2006, Pages 29-33
Journal: Journal of Power Sources - Volume 159, Issue 1, 13 September 2006, Pages 29-33
نویسندگان
Jiun-Ming Chen, Loka Subramanyam Sarma, Ching-Hsiang Chen, Ming-Yao Cheng, Shou-Chu Shih, Guo-Rung Wang, Din-Goa Liu, Jyh-Fu Lee, Mau-Tsu Tang, Bing-Joe Hwang,