Stable Pt – Ru ∕ C Catalysts Prepared from New Precursors by Thermal Reduction for Direct Methanol Fuel Cell
Stable Pt – Ru ∕ C Catalysts Prepared from New Precursors by Thermal Reduction for Direct Methanol Fuel Cell
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DOI：
10.1149/1.2120287
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发表时间：
2005-12
影响因子：
3.9
通讯作者：
Zhen-bo Wang;Geping Yin;Peng-fei Shi
中科院分区：
文献类型：
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作者：
Zhen-bo Wang;Geping Yin;Peng-fei Shi
本研究旨在提高Pt-Ru合金催化剂的活性，从而降低甲醇电氧化阳极中催化剂的负载。以Pt(nh3) 2 (no2) 2和自制的Ru化合物为前驱体，在不同还原温度和还原时间下制备了直接甲醇燃料电池（DMFC）的Pt-Ru/C阳极催化剂。用它们制成的玻碳工作电极，用循环伏安法和计时安培法检测了它们的性能。采用透射电镜和x射线衍射测定了催化剂的粒径和分布。以Pt(nh3) 2 (no2) 2和自行制备的Ru化合物为前驱物制备的Pt-Ru/C催化剂的活性和稳定性均高于化学还原或热还原由h2ptcl6和rucl3制备的催化剂。热还原次数和温度影响Pt-Ru/C催化剂的性能。Pt-Ru/C催化剂的粒径随着温度的升高而增大。在360℃条件下制备的Pt-Ru/C催化剂的催化活性高于320℃和400℃条件下制备的催化剂。Pt-Ru/C催化剂的粒径随还原时间的延长而增大。在360°C还原2 h后，其体积较小，约为3.7 nm，催化活性高于还原1 h和3 h后的催化活性。
This research is aimed at improving the activity of Pt-Ru alloy catalysts, thus to lower the catalyst loading in anodes for methanol electro-oxidation. The direct methanol fuel cell's (DMFC's) anodic catalysts as Pt-Ru/C were prepared from Pt(NH 3 ) 2 (NO 2 ) 2 and self-prepared Ru compound as precursors at different temperatures and times of duration during their reduction. Their performances were examined by cyclic voltammetry and chronoamperometry with a glassy carbon working electrode made from them. The particle size and its distribution of the catalysts were determined by means of transmission electron microscopy and X-ray diffraction. The activity and stability of Pt-Ru/C catalysts prepared from Pt(NH 3 ) 2 (NO 2 ) 2 and self-prepared Ru compound as precursors is higher than those from H 2 PtCl 6 and RuCl 3 by chemical or thermal reduction. The times and temperatures of thermal reduction affect the performance of Pt-Ru/C catalysts. The particle size of Pt-Ru/C catalysts increases with increasing temperature. The catalytic activity of Pt-Ru/C catalysts prepared at 360°C is higher than that of those prepared at 320 and 400°C. The particle size of Pt-Ru/C catalysts increases with the duration of reduction time. After 2 h at 360°C of reduction it is small, about 3.7 nm, and the catalytic activity is higher than those after 1 and 3 h of reduction.