Sol-Gel Synthesis of Ruthenium Oxide Nanowires To Enhance Methanol Oxidation in Supported Platinum Nanoparticle Catalysts.

Autor: Sztaberek L; Department of Chemistry, Fordham University, 441 East Fordham Road, Bronx, New York 10458, United States.; Department of Environmental Control Technology, New York City College of Technology, 300 Jay Street, Brooklyn, New York 11201, United States., Mabey H; Department of Chemistry and Biochemistry, Manhattan College, 4513 Manhattan College Parkway, Riverdale, New York 10471, United States., Beatrez W; Department of Chemistry, Fordham University, 441 East Fordham Road, Bronx, New York 10458, United States., Lore C; Department of Chemistry and Biochemistry, Manhattan College, 4513 Manhattan College Parkway, Riverdale, New York 10471, United States., Santulli AC; Department of Chemistry and Biochemistry, Manhattan College, 4513 Manhattan College Parkway, Riverdale, New York 10471, United States., Koenigsmann C; Department of Chemistry, Fordham University, 441 East Fordham Road, Bronx, New York 10458, United States.
Jazyk: angličtina
Zdroj: ACS omega [ACS Omega] 2019 Aug 21; Vol. 4 (10), pp. 14226-14233. Date of Electronic Publication: 2019 Aug 21 (Print Publication: 2019).
DOI: 10.1021/acsomega.9b01489
Abstrakt: A template-directed, sol-gel synthesis is utilized to produce crystalline RuO 2 nanowires. Crystalline nanowires with a diameter of 128 ± 15 nm were synthesized after treating the nanowires at 600 °C in air. Analysis of these nanowires by X-ray powder diffraction revealed the major crystalline phase to be tetragonal RuO 2 with a small quantity of metallic ruthenium present. Further analysis of the nanowire structures by high-resolution transmission electron microscopy reveals that they are polycrystalline and are composed of interconnected, highly crystalline, nanoparticles having an average size of ∼25 nm. Uniform 3 nm Pt nanoparticles were dispersed on the surface of RuO 2 nanowires using an ambient, solution-based technique yielding a hybrid catalyst for methanol oxidation. Linear sweep voltammograms (LSVs) and chronoamperometry performed in the presence of methanol in an acidic electrolyte revealed a significant enhancement in the onset potential, mass activity, and long-term stability compared with analogous Pt nanoparticles supported on commercially available Vulcan XC-72R carbon nanoparticles. Formic acid oxidation LSVs and CO stripping voltammetry revealed that the RuO 2 -supported Pt nanoparticles exhibit significantly higher CO tolerance, which leads to higher catalytic stability over a period of several hours. X-ray photoelectron spectroscopy results suggest that crystalline RuO 2 leads to less-significant oxidation of the Pt surface relative to more widely studied hydrous RuO 2 supports, thereby increasing catalytic performance.
Competing Interests: The authors declare no competing financial interest.
Databáze: MEDLINE
Externí odkaz: