کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
189226 459676 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pt–Ru nanoparticles supported on functionalized carbon as electrocatalysts for the methanol oxidation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Pt–Ru nanoparticles supported on functionalized carbon as electrocatalysts for the methanol oxidation
چکیده انگلیسی

Platinum–ruthenium alloy electrocatalysts, for methanol oxidation reaction, were prepared on carbons thermally treated in helium atmosphere or chemically functionalized in H2O2, or in HNO3 + H2SO4 or in HNO3 solutions. The functionalized carbon that is produced using acid solutions contains more surface oxygenated functional groups than carbon treated with H2O2 solution or HeTT. The XRD/HR-TEM analysis have showed the existence of a higher alloying degree for Pt–Ru electrocatalysts supported on functionalized carbon, which present superior electrocatalytic performance, assessed by cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy, as compared to electrocatalysts on unfunctionalized carbon. It also was found that Pt–Ru alloy electrocatalysts on functionalized carbon improve the reaction rate compared to Pt–Ru on carbons treated with H2O2 solution and thermally. A mechanism is discussed, where oxygenated groups generated from acid functionalization of carbon and adsorbed on Pt–Ru electrocatalysts are considered to enhance the electrocatalytic activity of the methanol oxidation reaction.

Figure optionsDownload as PowerPoint slideHighlights
► The functionalized carbon using acid solutions contains surface oxygenated groups.
► Uniform dispersion of PtRu nanoparticles on the carbon surface was achieved.
► Physical analysis showed the formation of PtRu alloy catalysts on functionalized carbon.
► PtRu alloy catalysts on functionalized carbon enhanced the methanol oxidation rate.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 56, Issue 24, 1 October 2011, Pages 8509–8518
نویسندگان
, , , , , ,