scholarly journals The effects of ruthenium-oxidation states on Ru dissolution in PtRu thin-film electrodes

2009 ◽  
Vol 24 (9) ◽  
pp. 2762-2766 ◽  
Author(s):  
Yejun Park ◽  
Byungjoo Lee ◽  
Chunjoong Kim ◽  
Yuhong Oh ◽  
Seunghoon Nam ◽  
...  
Keyword(s):  
Thin Film ◽  
Methanol Oxidation ◽  
Oxidation States ◽  
Hydrogen Electrode ◽  
Oxidation Activity ◽  
Oxidation Treatment ◽  
Ruthenium Oxidation ◽  
Normal Hydrogen ◽  
Thin Film Electrodes ◽  
Anodic Oxidation Treatment

The effects of ruthenium (Ru)-oxidation states were investigated on Ru dissolution from PtRu thin-film electrodes, with the 200 cycles between 0.4 and 1.05 V (versus normal hydrogen electrode). The Ru-oxidation states of the PtRu thin films were systematically modified by an anodic (oxidation) treatment. The anodic-treated PtRu electrodes, whose methanol-oxidation activity was similar to untreated electrodes before the 200 cycles, showed a remarkable decrease in methanol oxidation after the cycles, because of the Ru dissolution from the PtRu surface. The results suggest that the Ru-oxide species are the origin of Ru dissolution in the PtRu alloy.

Nanostructured Platinum/Iron Phosphate Thin-Film Electrodes for Methanol Oxidation

2006 ◽  
Vol 9 (10) ◽  
pp. E27 ◽  
Author(s):  
Byungjoo Lee ◽  
Chunjoong Kim ◽  
Yejun Park ◽  
Tae-Gon Kim ◽  
Byungwoo Park
Keyword(s):  
Thin Film ◽  
Methanol Oxidation ◽  
Iron Phosphate ◽  
Thin Film Electrodes

Nanoscale Structural and Chemical Segregation in Pt50Ru50 Electrocatalysts

2001 ◽  
Vol 7 (S2) ◽  
pp. 1112-1113
Author(s):  
Rhonda M. Stroud ◽  
Jeffrey W. Long ◽  
Karen E. Swider-Lyons ◽  
Debra R. Rolison
Keyword(s):  
Methanol Oxidation ◽  
Structural Heterogeneity ◽  
Oxidation Activity ◽  
Bimetallic Alloy ◽  
Transmission Electron ◽  
Chemical Segregation ◽  
High Fraction ◽  
Argon Mixture ◽  
Microscopy Techniques ◽  
Electron Energy Loss

To address how the chemical and structural heterogeneity of Pt50Ru50 nanoparticles affects methanol oxidation activity, we have employed an arsenal of transmission electron microscopy techniques (conventional bright field-imaging, selected area diffraction, atomic-resolution lattice imaging, electron-energy loss spectroscopy, and energy-dispersive x-ray spectroscopy) to characterize 2.5-nm particles in differing oxidation and hydration states. Our studies demonstrate that electrocatalysts containing a high fraction of Ru-rich hydrous oxide, as apposed to the anhydrous PtRu bimetallic alloy, have as much as 250x higher methanol oxidation activityThe nominally 2.5-nm Pt50Ru50 particles were studied in as-received, reduced and reoxidized forms. The reducing treatment consisted of 2 h at 100 °C in flowing 10% PL/argon mixture. For re-oxidation, the reduced particles were heated for 20 h at 100 °C in an H2O-saturated oxygen atmosphere. The particles were suspended in methanol, and pipetted onto holey-carboncoated Cu grids for TEM studies.

One-step hydrothermal method for preparation of Ni/carbon thin film electrodes for efficient electroreduction of imidacloprid

2021 ◽  
Vol 45 (7) ◽  
pp. 3469-3478
Author(s):  
Zongyu Liu ◽  
Ying Tian ◽  
Xuewei Dong ◽  
Xiaohui Zhou ◽  
Xiao Liu ◽  
...  
Keyword(s):  
Thin Film ◽  
Hydrothermal Method ◽  
Removal Efficiency ◽  
Carbon Thin Film ◽  
One Step ◽  
Thin Film Electrodes

A Ni/CTF was used as the cathode for electroreduction of imidacloprid, achieving a 92.1% removal efficiency for the electroreduction of imidacloprid.

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