scholarly journals Surfactant-Free Synthesis of Three-Dimensional Perovskite Titania-Based Micron-Scale Motifs Used as Catalytic Supports for the Methanol Oxidation Reaction

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 909
Author(s):  
Nathaniel Hurley ◽  
Luyao Li ◽  
Christopher Koenigsmann ◽  
Stanislaus S. Wong
Keyword(s):  
Chemical Composition ◽  
Methanol Oxidation ◽  
Oxidation Reaction ◽  
Specific Activity ◽  
Three Dimensional ◽  
Methanol Oxidation Reaction ◽  
Perovskite Materials ◽  
Synthesis Procedure ◽  
Catalytic Supports ◽  
A Site

We synthesized and subsequently rationalized the formation of a series of 3D hierarchical metal oxide spherical motifs. Specifically, we varied the chemical composition within a family of ATiO3 (wherein “A” = Ca, Sr, and Ba) perovskites, using a two-step, surfactant-free synthesis procedure to generate structures with average diameters of ~3 microns. In terms of demonstrating the practicality of these perovskite materials, we have explored their use as supports for the methanol oxidation reaction (MOR) as a function of their size, morphology, and chemical composition. The MOR activity of our target systems was found to increase with decreasing ionic radius of the “A” site cation, in order of Pt/CaTiO3 (CTO) > Pt/SrTiO3 (STO) > Pt/BaTiO3 (BTO). With respect to morphology, we observed an MOR enhancement of our 3D spherical motifs, as compared with either ultra-small or cubic control samples. Moreover, the Pt/CTO sample yielded not only improved mass and specific activity values but also a greater stability and durability, as compared with both commercial TiO2 nanoparticle standards and precursor TiO2 templates.

Directed self-assembly pathways of three-dimensional Pt/Pd nanocrystal superlattice electrocatalysts for enhanced methanol oxidation reaction

2018 ◽  
Vol 6 (26) ◽  
pp. 12759-12767 ◽  
Author(s):  
Guangran Xu ◽  
Rui Si ◽  
Jiayin Liu ◽  
Luyao Zhang ◽  
Xia Gong ◽  
...  
Keyword(s):  
Methanol Oxidation ◽  
Self Assembly ◽  
Oxidation Reaction ◽  
Active Sites ◽  
Nitrogen Doping ◽  
Three Dimensional ◽  
Methanol Oxidation Reaction ◽  
Assembly Strategy ◽  
Nanocrystal Superlattices ◽  
Assembly Pathways

A new directed self-assembly strategy is developed to achieve 3D Pt/Pd nanocrystal superlattices with enhanced electrocatalytic performance for methanol oxidation reaction due to the enriched metallic Pt active sites by appropriate Pd alloying and surface nitrogen doping.

scholarly journals Tailoring the composition of ultrathin, ternary alloy PtRuFe nanowires for the methanol oxidation reaction and formic acid oxidation reaction

2015 ◽  
Vol 8 (1) ◽  
pp. 350-363 ◽  
Author(s):  
Megan E. Scofield ◽  
Christopher Koenigsmann ◽  
Lei Wang ◽  
Haiqing Liu ◽  
Stanislaus S. Wong
Keyword(s):  
Chemical Composition ◽  
Formic Acid ◽  
Methanol Oxidation ◽  
Ternary Alloy ◽  
Oxidation Reaction ◽  
Formic Acid Oxidation ◽  
Methanol Oxidation Reaction ◽  
Acid Oxidation ◽  
Formic Acid Oxidation Reaction

We have synthesized novel ultrathin ternary PtRuFe nanowires (NW) and probed both their methanol oxidation reaction (MOR) and formic acid oxidation reaction (FAOR) activities as a function of chemical composition.

Low Density Three-Dimensional Metal Foams as Significant Electrocatalysts toward Methanol Oxidation Reaction

2018 ◽  
Vol 6 (2) ◽  
pp. 2062-2068 ◽  
Author(s):  
Divya Catherin Sesu ◽  
Indrajit Patil ◽  
Moorthi Lokanathan ◽  
Haridas Parse ◽  
Phiralang Marbaniang ◽  
...  
Keyword(s):  
Methanol Oxidation ◽  
Oxidation Reaction ◽  
Three Dimensional ◽  
Metal Foams ◽  
Methanol Oxidation Reaction ◽  
Low Density

Nanomaterials-Based PEM Electrodes by Combining Chemical and Physical Depositions

2011 ◽  
Vol 8 (4) ◽  
Author(s):  
R. Giorgi ◽  
L. Giorgi ◽  
S. Gagliardi ◽  
E. Salernitano ◽  
M. Alvisi ◽  
...  
Keyword(s):  
Polymer Electrolyte ◽  
Methanol Oxidation ◽  
Oxidation Reaction ◽  
Specific Activity ◽  
Catalyst Activity ◽  
Catalyst Support ◽  
Sputter Deposition ◽  
Utilization Efficiency ◽  
Methanol Oxidation Reaction ◽  
Carbon Based

The real market penetration of polymer electrolyte fuel cells is hindered by the high cost of this technology mainly due to the expensive platinum catalyst. Two approaches are followed to reduce the cost: one way is to increase the Pt utilization efficiency reducing at the same time the total load and the other way is to increase the catalytic activity of the catalyst/support assembly. In this work, the increase of utilization efficiency is addressed by optimizing the catalyst distribution on the uppermost layer of the electrode via electrodeposition and sputter deposition, while the improvement of the catalyst activity is pursued by nanostructuring the catalysts and the carbon-based supports. A very low Pt loading (0.006 mg cm−2) was obtained by sputter deposition on electrodes that exhibited a mass specific activity for methanol oxidation reaction better than a commercial product. Carbon nanofibers used as catalyst support of electrodeposited platinum nanoparticles resulted in improved mass specific activity and long term stability compared to conventional carbon-based supports. Finally, PtAu alloys developed by sputter deposition were found more efficient than commercial PtRu catalyst for the methanol oxidation reaction. In conclusion, polymer electrolyte membrane fuel cell electrode based on nanomaterials, developed by combining physical and chemical deposition processes, showed outstanding electrochemical performance.

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