Spectroscopic and morphological studies on the electrooxidation of Pt–Ni alloys in HCl solution

Chen, Shu; San, Wu; Zheng, Jianbin; Li, Zelin

doi:10.1016/j.jelechem.2009.01.005

Cited by 7 publications

(1 citation statement)

References 23 publications

(27 reference statements)

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“…While the roughening might be caused by the limited dissolution of Si, which is supported by a slight decrease of surface Si from the XPS data obtained right after these CV measurements, as shown in SI Figure S6. However, it should be noted that even after hundreds of cycles, most of the Si near the surface still remained, which is remarkably different from what is seen after acid leaching of PtNi or PtCu alloys, where the surface transition metals quickly dissolve into the acid leaving a Pt-rich shell on the surface. − …”

Section: Results and Discussionmentioning

confidence: 84%

Pt—Si Bifunctional Surfaces for CO and Methanol Electro-Oxidation

et al. 2015

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The bimetallic surfaces offer activity benefits derived from synergistic effects among active sites with uniquely different functions, which is particularly important for the development of highly effective heterogeneous catalysts for specific technological applications, such as energy conversion and storage. Here we report on Pt-Si bulk samples prepared by arc-melting, for the first time, with high activities towards the electro-oxidation of CO and methanol. Increasing the Si concentration on the surface was correlated with the shifts of onset oxidation potentials to lower values and higher activities for CO and methanol electro-oxidation. It is proposed that the reaction on the Pt-Si catalyst could follow a Langmuir-Hinshelwood type of mechanism, where substantially enhanced catalytic activity is attributed to the fine-tuning of the surface Pt-Si atomic structure.

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