کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5367056 1388360 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reversible surface structural changes in Pt-based bimetallic nanoparticles during oxidation and reduction cycles
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Reversible surface structural changes in Pt-based bimetallic nanoparticles during oxidation and reduction cycles
چکیده انگلیسی

The surface states of supported PtNi nanoparticles treated at alternating O2 and H2 atmosphere were studied by X-ray photoelectron spectroscopy. Reversible structural changes at the surfaces of the supported PtNi nanoparticles in response to reaction gases were observed, showing NiO-rich surface in oxidizing gases and Pt-rich surface in reducing gases. The dynamic behaviors can be attributed to two opposite gas-driven mass transport processes at bimetallic particle surfaces, including surface segregation of Pt at the bimetallic particles in H2 and encapsulation of the particles by NiO in O2. The similar surface structural changes can be observed in other bimetallic catalyst systems, as exemplified in supported PtCu and PtCo nanoparticles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 255, Issue 16, 30 May 2009, Pages 7296-7301
نویسندگان
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