标题：Nanoporous PtRu alloys for electrocatalysis
作者：Xu, C.;Wang, L.;Mu, X.;Ding, Y.
作者机构：[Xu, C] School of Chemistry and Chemical Engineering, University of Jinan, Jinan, China;[ Wang, L] School of Chemistry and Chemical Engineering, Shand 更多
通讯作者地址：[Xu, CX]Univ Jinan, Sch Chem & Chem Engn, Jinan, Peoples R China.
来源：Langmuir: The ACS Journal of Surfaces and Colloids
摘要：We describe a facile route to the straightforward fabrication of nanoporous (NP) PtRu alloys with predetermined bimetallic compositions. Electron microscopy and X-ray diffraction characterizations demonstrate that selective etching of Al from ternary PtRuAl source alloys generates three-dimensional bicontinuous NP-PtRu alloy nanostructures with a single-phase face-centered-cubic crystalline structure. X-ray photoelectron spectroscopy shows a slight electronic structure modification of Pt by alloying with Ru as well as uniform surface and bulk bimetallic ratio. With characteristic structural dimensions less than 5 nm, these high surface area bimetallic nanostructures show distinct electrocatalytic performance as the Ru content varies within the structure. Among all samples, NP-Pt_(70)Ru _(30) shows the highest specific activity as well as the most negative onset potential toward methanol oxidation reaction. NP-Pt_(50)Ru _(50) was found to possess a similar specific activity to the commercial E-TEK Pt_(50)Ru_(50)/C catalyst, but its onset and peak potentials are about 70 mV more negative. CO stripping experiments demonstrate that the adsorption of CO is the weakest on NP-Pt_(70)Ru_(30), and further increasing the Ru content actually shifts the CO stripping peak to a more positive potential. Thus, the overall sequence for CO-tolerance is NP-Pt_(70)Ru_(30) > NP-Pt_(50)Ru_(50) ≈ Pt_(50)Ru_(50)/C > NP-Pt_(30)Ru_(70) > Pt/C.