Bulk and Surface Compositions of PtRu Catalysts and Their Methanol Oxidation Activity and Durability

2019 ◽  
Vol 33 (1) ◽  
pp. 275-286
Author(s):  
Taigo Onodera ◽  
Shuichi Suzuki ◽  
Yoshiyuki Takamori ◽  
Hideo Daimon
Keyword(s):  
Methanol Oxidation ◽  
Oxidation Activity ◽  
Ptru Catalysts

Methanol Oxidation Activity of Nanosized PtRu Catalysts and Their Microstructures

2010 ◽  
Vol 5 (2) ◽  
pp. 120-124 ◽  
Author(s):  
H. Daimon ◽  
T. Onodera ◽  
T. Nakagawa ◽  
H. Nitani ◽  
T. A. Yayamoto
Keyword(s):  
Methanol Oxidation ◽  
Oxidation Activity ◽  
Ptru Catalysts

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.

PtRu Catalysts on Nitrogen-Doped Carbon Nanotubes with Conformal Hydrogenated TiO2 Shells for Methanol Oxidation

2022 ◽  
Author(s):  
Archana Sekar ◽  
Nathaniel Metzger ◽  
Sabari Rajendran ◽  
Ayyappan Elangovan ◽  
Yonghai Cao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Methanol Oxidation ◽  
Nitrogen Doped ◽  
Ptru Catalysts ◽  
Nitrogen Doped Carbon

Formation of PtRu alloy nanoparticle catalyst by radiolytic process assisted by addition of dl-tartaric acid and its enhanced methanol oxidation activity

2011 ◽  
Vol 13 (10) ◽  
pp. 5275-5287 ◽  
Author(s):  
Satoru Kageyama ◽  
Satoshi Seino ◽  
Takashi Nakagawa ◽  
Hiroaki Nitani ◽  
Koji Ueno ◽  
...  
Keyword(s):  
Tartaric Acid ◽  
Methanol Oxidation ◽  
Oxidation Activity ◽  
Radiolytic Process ◽  
Nanoparticle Catalyst

Improved Methanol Oxidation Activity Through Oxidation-Induced Phase Separation of PtRu Electrocatalysts

2000 ◽  
Vol 6 (S2) ◽  
pp. 24-25
Author(s):  
R.M. Stroud ◽  
J.W. Long ◽  
K.E. Swider ◽  
D.R. Rolison
Keyword(s):  
Fuel Cells ◽  
Methanol Oxidation ◽  
Direct Methanol Fuel Cells ◽  
Ruthenium Oxide ◽  
Hydrogen Fuel ◽  
Oxidation Activity ◽  
Power Sources ◽  
Bimetallic Alloys ◽  
Point Of Use ◽  
Direct Methanol

Direct methanol fuel cells (DMFCs) offer a simpler, safer technology for point-of-use power sources compared to other hydrogen fuel cells, by avoiding the need to store hydrogen fuel or to carry out the reformation of hydrocarbons. The direct methanol oxidation electrocatalyst of choice is a nanoscale black consisting of a 50:50 atom % mixture of Pt and Ru. It has recently become known that these presumed bimetallic alloys in fact contain an array of metal, oxide and hydrous phases, which are easily misidentified in routine x-ray diffraction measurements due to particle size-broadening and poor crystallinity. By combining transmission electron microscopy, electrochemistry and thermogravimetric studies, we demonstrate here that the route to improved catalytic activity is not by phase purification of the bimetallic alloys, but instead phase engineering of hydrous ruthenium oxide and Pt mixtures.

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