Ultimate Corrosion to Pt‐Cu Electrocatalysts for Enhancing Methanol Oxidation Activity and Stability in Acidic Media

2021 ◽  
Author(s):  
Yong Wang ◽  
Hao-Zheng Yu ◽  
Jie Ying ◽  
Ge Tian ◽  
Yu Liu ◽  
...  
Keyword(s):  
Methanol Oxidation ◽  
Acidic Media ◽  
Oxidation Activity

Mn-Mo-O Catalysts for Methanol Oxidation. I. Preparation and Characterization of the Catalysts

1992 ◽  
Vol 57 (12) ◽  
pp. 2529-2538 ◽  
Author(s):  
Krasimir Ivanov ◽  
Penka Litcheva ◽  
Dimitar Klissurski
Keyword(s):  
Methanol Oxidation ◽  
Solution Concentration ◽  
Alkaline Media ◽  
Acidic Media ◽  
Chemical Methods ◽  
X Ray ◽  
Ph Values ◽  
Precipitate Composition

Mn-Mo-O catalysts with a different Mo/Mn ratio have been prepared by precipitation. The precipitate composition as a function of solution concentration and pH was studied by X-ray, IR, thermal and chemical methods. Formation of manganese molybdates with MnMoO4.1.5H2O, Mn3Mo3O12.2.5H2O, and Mn3Mo4O15.4H2O composition has been supposed. It is concluded that pure MnMoO4 may be obtained in both acid and alkaline media, the pH values depending on the concentration of the initial solutions. The maximum Mo/Mn ratio in the precipitates is 1.33. The formation of pure Mn3Mo4O15.4H2O is possible in weakly acidic media. This process is favoured by increasing the concentration of initial solutions.

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.

scholarly journals Enhanced electrocatalytic performance of platinum nanoparticles on thiolated polyaniline-multiwalled carbon nanotubes for methanol oxidation

RSC Advances ◽  
2018 ◽  
Vol 8 (59) ◽  
pp. 33742-33747 ◽  
Author(s):  
Zhaohong Su ◽  
Chaorong Li ◽  
Yongbing Cheng ◽  
Qingwen Gui ◽  
Yuanfu Xiong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Methanol Oxidation ◽  
Platinum Nanoparticles ◽  
Electrocatalytic Oxidation ◽  
Pt Nanoparticles ◽  
Acidic Media ◽  
Multiwalled Carbon ◽  
Oxidation Of Methanol ◽  
Electrocatalytic Performance

Pt nanoparticles (PtNPs) well-dispersed on thiolated polyaniline (TPANI)-multiwalled carbon nanotubes (MWCNTs) were prepared for enhanced electrocatalytic oxidation of methanol in acidic media.

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.

scholarly journals Effect of Pt Oxidation State on Methanol Oxidation Activity

2011 ◽  
Vol 32 (1-2) ◽  
pp. 86-92 ◽  
Author(s):  
Jianhuang ZENG ◽  
Ting SHU ◽  
Shijun LIAO ◽  
Zhenxing LIANG
Keyword(s):  
Oxidation State ◽  
Methanol Oxidation ◽  
Oxidation Activity

PtRu-SiO2-TiO2/C Anode Electrocatalyst for Direct Methanol Fuel Cell

2011 ◽  
Vol 287-290 ◽  
pp. 1369-1374 ◽  
Author(s):  
Jian Feng Ju ◽  
Dong Hui Wu ◽  
Yu Jun Shi
Keyword(s):  
Fuel Cell ◽  
Methanol Oxidation ◽  
Direct Methanol Fuel Cell ◽  
Nitrogen Adsorption ◽  
Surface Characteristics ◽  
Cyclic Voltammograms ◽  
Oxidation Activity ◽  
Transmission Electron ◽  
Direct Methanol ◽  
Methanol Fuel Cell

The PtRu-SiO2-TiO2/C anode electrocatalyst ( loading 10wt% PtRu ) of direct methanol fuel cell is prepared by the surface reductive deposition method, using Vulcan XC-72 carbon black coated with nanometer SiO2-TiO2 (SiO2-TiO2/C) as the isotopic carrier. The surface characteristics of nanometer SiO2-TiO2 is studied through nitrogen adsorption, which shows that it is of porous structure together with large surface area, that is benefit to enhance the activity of SiO2-TiO2 and the dispersion of PtRu nanoparticle on the carrier of SiO2-TiO2/C. X-ray diffraction( XRD ) and transmission electron microscopy( TEM ) are used to characterize the catalyst. The PtRu nanoparticle homodisperse in SiO2-TiO2/C carrier with diameter around 2.4 nm. Cyclic voltammograms and chronoamperograms are conducted to compare the electrochemical methanol oxidation activity of the PtRu-SiO2-TiO2/C catalyst with the commercial PuRu/C catalyst ( 20 wt% of PtRu ). The results show that PtRu-SiO2-TiO2/C has higher catalytic activity and anti-poisoning ability for methanol oxidation, the addition of porous SiO2-TiO2 can replace the PtRu to some extent, comparing with the commercial PuRu/C catalyst, not only the loading of PtRu has been cut down 50%, but also the electro-oxidizing activity of methanol improved. The electro-oxidizing mechanism is basically analyzed.

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