Electrochemical Properties of Nanostructured AgxPt100-x/C Electrocatalyst for Oxygen Reduction Reaction

Godínez-García, Andrés; García‐García, Alejandra; Martínez-Tejada, H.V.; Pérez-Robles, J.F.; Solorza‐Feria, O.

doi:10.14447/jnmes.v15i3.56

Cited by 5 publications

(2 citation statements)

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“…Owing to the presence of nanostructured Au and Ag, the Pd/Pt–Au–Ag CMs/SMs were expected to exhibit intense optical properties based on the LSPR. In contrast, Pd and Pt are known to dampen the LSPR properties of Au and Ag nanomaterials when combined, − which could have occurred in the Pd/Pt–Au–Ag CMs/SMs. Interestingly, the Pd–Au–Ag CMs/SMs exhibited intense and broad plasmonic absorption bands in the range of visible and near-infrared light (400–1000 nm).…”

Section: Resultsmentioning

confidence: 99%

Wrapping AgCl Nanostructures with Trimetallic Nanomeshes for Plasmon-Enhanced Catalysis and in Situ SERS Monitoring of Chemical Reactions

Ryu

Shin

et al. 2019

ACS Appl. Mater. Interfaces

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Selective chemical control of multiple reactions is incredibly important for the fabrication of sophisticated nanostructures for functional applications. A representative example is the synthesis of plasmonic nanomaterial−silver chloride (AgCl) conjugates, where metal ions should be selectively reduced into metallic nanostructures for plasmon-enhanced catalytic activity, while the reducible AgCl nanomaterials remain intact despite the presence of a chemical reductant. In addition to the selectively controlled reduction, the plasmonic nanostructures should be appropriately designed for the high stability and photoefficiency of catalysts. In this study, we demonstrate how AgCl nanocubes and nanospheres could be comprehensively wrapped by plasmonic three-dimensional nanomesh structures consisting of gold, silver, and palladium by the selective reduction of their ionic precursors while the AgCl nanostructures remain intact. Complete trimetallic wrapping provided the absorption of visible light, while the porosity of the nanomesh structures exposed the photocatalytic AgCl surface to catalyze desired reactions. Platinum in place of palladium was examined to demonstrate the versatility of the wrapping scheme, resulting in an extraordinary catalytic activity. Importantly, the detailed chemical mechanism behind the trimetallic wrapping of the AgCl nanostructures was systematically investigated to understand the roles of each reaction component in controlling the chemical selectivity. The synthesized AgCl−trimetal nanoconjugates excellently exhibit both metal-based and plasmon-enhanced catalytic properties for the removal of environmentally harmful Cr 6+ . Moreover, their applications as surface-enhanced Raman-scattering (SERS) probes for the in situ monitoring of catalytic reduction in real-time and as single-nanoparticle SERS probes for molecular detection are thoroughly demonstrated.

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Section: Resultsmentioning

confidence: 99%

Wrapping AgCl Nanostructures with Trimetallic Nanomeshes for Plasmon-Enhanced Catalysis and in Situ SERS Monitoring of Chemical Reactions

Ryu

Shin

et al. 2019

ACS Appl. Mater. Interfaces

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“…However the need for lowered cost and improved durability challenge widespread commercialization. [2][3][4][5] The core of a PEM fuel cell is the membrane electrode assembly (MEA), which consists of a thin polymer electrolyte membrane, whose 2 surfaces are covered by anode and cathode catalyst layers, and then gas diffusion layers. The MEA is prone to degradation under the duty cycles required for an automotive fuel cell.…”

Section: Introductionmentioning

confidence: 99%

Pd–Pt nanostructures on carbon nanofibers as an oxygen reduction electrocatalyst

Godínez-García

Gervasio

2014

RSC Adv.

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A new oxygen reduction catalyst is made of Pd and Pt nanostructures (Pd-Pt) supported on a herring-bone arrangement of carbon nanofibers (NFs) and is synthesized in one pot by the sequential reduction of Pd 2+ and Pt 4+ in aqueous chloride solution with ethylene glycol and then adding the carbon NF to precipitate the catalyst. The exchange current density for the oxygen reduction reaction (ORR) on Pd-Pt is 1.44 Â 10 À4 mA cm À2 versus 1.41 Â 10 À4 mA cm À2 for pure Pt as determined using a thin-film rotating disk electrode (TF-RDE) method. A single cell hydrogen anode and oxygen cathode fuel cell in which the cathode is catalyzed with Pd-Pt gives a performance as good as or better than with a commercial Pt catalyst in the cathode for the same total metal loading, 0.5 mg metal cm À2 . This shows the catalyst made of Pd-Pt supported on carbon NF is a low cost alternative to Pt on carbon, because it gives the same or better activity with less Pt.

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Electrochemical properties of mechanically milled Ni-20Cr for H2 oxidation in alkaline fuel cells

Antonio-Gordillo

Godínez-García

Alonso-González

et al. 2023

Chemical Physics Letters

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Electrochemical Properties of Nanostructured AgxPt100-x/C Electrocatalyst for Oxygen Reduction Reaction

Cited by 5 publications

References 0 publications

Wrapping AgCl Nanostructures with Trimetallic Nanomeshes for Plasmon-Enhanced Catalysis and in Situ SERS Monitoring of Chemical Reactions

Wrapping AgCl Nanostructures with Trimetallic Nanomeshes for Plasmon-Enhanced Catalysis and in Situ SERS Monitoring of Chemical Reactions

Pd–Pt nanostructures on carbon nanofibers as an oxygen reduction electrocatalyst

Electrochemical properties of mechanically milled Ni-20Cr for H2 oxidation in alkaline fuel cells

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