Electrochemical Oxidation of the Carbon Support to Synthesize Pt(Cu) and Pt-Ru(Cu) Core-Shell Electrocatalysts for Low-Temperature Fuel Cells

催化作用 电化学 材料科学 X射线光电子能谱 原电池 碳纤维 欠电位沉积 高分辨率透射电子显微镜 炭黑 纳米颗粒 化学工程 金属 无机化学 化学 纳米技术 电极 循环伏安法 冶金 复合数 透射电子显微镜 物理化学 天然橡胶 复合材料 工程类 生物化学
作者
Griselda Caballero-Manrique,Enric Brillas,Francesc Centellas,José António Garrido,Rosa Marı́a Rodrı́guez,Pere Lluı́s Cabot
出处
期刊:Catalysts [MDPI AG]
卷期号:5 (2): 815-837 被引量:19
标识
DOI:10.3390/catal5020815
摘要

The synthesis of core-shell Pt(Cu) and Pt-Ru(Cu) electrocatalysts allows for a reduction in the amount of precious metal and, as was previously shown, a better CO oxidation performance can be achieved when compared to the nanoparticulated Pt and Pt-Ru ones. In this paper, the carbon black used as the support was previously submitted to electrochemical oxidation and characterized by XPS. The new catalysts thus prepared were characterized by HRTEM, FFT, EDX, and electrochemical techniques. Cu nanoparticles were generated by electrodeposition and were further transformed into Pt(Cu) and Pt-Ru(Cu) core-shell nanoparticles by successive galvanic exchange with Pt and spontaneous deposition of Ru species, the smallest ones being 3.3 nm in mean size. The onset potential for CO oxidation was as good as that obtained for the untreated carbon, with CO stripping peak potentials about 0.1 and 0.2 V more negative than those corresponding to Pt/C and Ru-decorated Pt/C, respectively. Carbon oxidation yielded an additional improvement in the catalyst performance, because the ECSA values for hydrogen adsorption/desorption were much higher than those obtained for the non-oxidized carbon. This suggested a higher accessibility of the Pt sites in spite of having the same nanoparticle structure and mean size.
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