کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7734441 1497959 2015 34 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Performance of vertically oriented graphene supported platinum-ruthenium bimetallic catalyst for methanol oxidation
ترجمه فارسی عنوان
عملکرد گرافن عمودی گرا، کاتالیزور دوتایی فلزی پلاتین-روتنیم برای اکسیداسیون متانول
کلمات کلیدی
سلول های سوخت مستقیم متانول، اکسیداسیون متانول، الکتروتالیز، گرافن عمودی گرا، کاتالیزور دوتایی،
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
This work reports the electrocatalytic performance of vertically oriented graphene (VG) supported Pt-Ru bimetallic catalysts toward methanol oxidation reaction (MOR). Dense networks of VG are directly synthesized on carbon paper (CP) via a microwave plamsa-enhanced chemical vapor deposition (PECVD) method. A repeated pulse potentials approach is applied in a conventional three-electrode electrochemical system for the co-electrodeposition of Pt-Ru bimetallic nanoparticles. It is found that, the decoration of VG can simultaneously lead to a ∼3.5 times higher catalyst mass loading and a ∼50% smaller nanoparticle size than the pristine CP counterparts. An optimum Pt molar ratio of 83.4% in the deposits, achieved with a [H2PtCl6]:[RuCl3] of 1:1 in the electrolyte, is clarified with synthetically considering the mass specific activity, CO tolerance, and catalytic stability. According to Tafel analysis and cyclic voltammetry (CV) tests, the Pt-Ru/VG catalyst with the optimized Pt molar ratio can realize a faster methanol dehydrogenation than Pt/VG, and present a significantly enhanced catalytic activity (maximum current density of 339.2 mA mg−1) than those using pristine CP and Vulcan XC-72 as the supports.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 273, 1 January 2015, Pages 530-537
نویسندگان
, , , , ,