Displacement reduction routed Au–Pt bimetallic nanoparticles: a highly durable electrocatalyst for methanol oxidation and oxygen reduction

Gowthaman, N.S.K.; Sinduja, Bharathi; Shankar, Sekar; John, S. Abraham

doi:10.1039/c7se00565b

Cited by 26 publications

(21 citation statements)

References 41 publications

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“…The benefit of adding hydrophilicity to the support was also seen in other systems, such as reduced graphene oxide. , Notably, these two TMVCP-Pt catalysts also showed higher alkaline MOR activity compared to some previously reported Pt-based NMs, as listed in Table S2 in the SI. For instance, the mass activities (although under higher alkaline concentrations) were 939, 1200, and 132 A/g for Pt NPs supported on multiple-layered graphene, PtNi alloy NPs, and Au–Pt coreshell NPs, respectively. These values are all lower than TMVCP-Pt NRs and Pt NPs, illustrating the great promise of TMVCP as a building block for the fabrication of highly efficient electrocatalysts.…”

Section: Results and Discussionmentioning

confidence: 99%

Tunable Assembly of Protein Enables Fabrication of Platinum Nanostructures with Different Catalytic Activity

Pan

Blum

Mauzeroll

2021

ACS Appl. Mater. Interfaces

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Proteins are promising biofunctional units for the construction of nanomaterials (NMs) due to their abundant binding sites, intriguing self-assembly properties, and mild NM synthetic conditions. Tobacco mosaic virus coat protein (TMVCP) is a protein capable of self-assembly into distinct morphologies depending on the solution pH and ionic strength. Herein, we report the use of TMVCP as a building block to organize nanosized platinum into discrete nanorings and isolated nanoparticles by varying the solution pH to modulate the protein assembly state. Compared with a commercial Pt/C catalyst, the TMVCPtemplated platinum materials exhibited significant promotion of the catalytic activity and stability toward methanol electrooxidation in both neutral and alkaline conditions. The enhanced catalytic performance is likely facilitated by the protein support. Additionally, Pt nanorings outperformed isolated nanoparticles, although they are both synthesized on TMVCP templates. This could be due to the higher mechanical stability of the protein disk structure and possible cooperative effects between adjacent nanoparticles in the ring with narrow interparticle spacing.

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Section: Results and Discussionmentioning

confidence: 99%

Tunable Assembly of Protein Enables Fabrication of Platinum Nanostructures with Different Catalytic Activity

Pan

Blum

Mauzeroll

2021

ACS Appl. Mater. Interfaces

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“…Figure displays the Nyquist plots of SPCE and Ag–P NPs/SPCE. The Nyquist plot exhibited the linear portions at lower frequencies, which are associated with the diffusion behavior and the semicircle portions at higher frequencies, which are associated with the electrochemical process subject to electron transfer, and the diameter is resembled to the resistivity of the electrode. , Moreover, from the semicircle, the charge transfer resistance (R CT ) of the electrode can be obtained. The EIS data were well fitted with the Randles equivalent circuit model (inset, Figure ).…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Scaffold Based on Silver Phosphate Nanoparticles for the Quantification of Acetaminophen in Body Fluids and Pharmaceutical Formulations

Gowthaman

Lim

Shankar

2019

ACS Appl. Nano Mater.

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Herein, we present the electrochemical scaffold for the quantification of acetaminophen (ACAP) using a silver phosphate nanoparticle (Ag−P NP) fabricated screen-printed carbon electrode (SPCE). The Ag−P NPs were synthesized by a facile method through simply refluxing the reaction mixture of AgNO 3 and Na 2 HPO 4 at 120 °C in the presence of citric acid followed by calcination. The obtained Ag−P NPs were characterized by Fourier transform infrared (FT-IR) and UV− vis diffused reflectance spectroscopies, X-ray diffraction (XRD), and electron microscopic tools. The as-prepared Ag−P NPs exhibited the bandgap energy of 2.2 eV, and the prepared Ag−P NPs have a sphere-like morphology with 13 nm average size. The main strategy of this study lies in providing the electrocatalytic oxidation of ACAP at the surface of the Ag−P NPs modified electrode. The developed sensor was applied to determine ACAP from commercial drugs and human fluids. The Ag-P NPs modified electrode detects ACAP in the linear concentration of 0.1−1900 μM with the lowest detection limit of 0.39 nM (S/N = 3) with the superior sensitivity of 2244.4 μA/μM•cm 2 . Further, the developed sensor showed excellent specificity, sensitivity, reproducibility, and stability compared to the previously reported sensors. Finally, the developed sensor has been exploited to testify the practicability by determining the concentration of ACAP from pharmaceutical samples and human fluids. The synthesized Ag−P NPs were also utilized for antibacterial studies against Staphylococcus aureus and Aspergillus niger.

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“…However, the optical and catalytic properties can be improved by combining two different metals at nanometric scale [61], in which, metal composition and shape provide unique functionality [62]. Among the different bimetallic NPs, Au-Pt NPs show higher electrocatalytic activity that represents widely promising functions in catalysis applications, such as a suitable catalyst for methanol oxidation and oxygen reduction reaction [63]. The enhanced photocatalytic activity is attributable to the synergy of the metal composition and the SPR effects.…”

Section: Resultsmentioning

confidence: 99%

Ultrasonic Influence on Plasmonic Effects Exhibited by Photoactive Bimetallic Au-Pt Nanoparticles Suspended in Ethanol

Hurtado-Aviles

Torres²,

Trejo-Valdéz

et al. 2019

Materials

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The optical behavior exhibited by bimetallic nanoparticles was analyzed by the influence of ultrasonic and nonlinear optical waves in propagation through the samples contained in an ethanol suspension. The Au-Pt nanoparticles were prepared by a sol-gel method. Optical characterization recorded by UV-vis spectrophotometer shows two absorption peaks correlated to the synergistic effects of the bimetallic alloy. The structure and nanocrystalline nature of the samples were confirmed by Scanning Transmission Electron Microscopy with X-ray energy dispersive spectroscopy evaluations. The absorption of light associated with Surface Plasmon Resonance phenomena in the samples was modified by the dynamic influence of ultrasonic effects during the propagation of optical signals promoting nonlinear absorption and nonlinear refraction. The third-order nonlinear optical response of the nanoparticles dispersed in the ethanol-based fluid was explored by nanosecond pulses at 532 nm. The propagation of high-frequency sound waves through a nanofluid generates a destabilization in the distribution of the nanoparticles, avoiding possible agglomerations. Besides, the influence of mechanical perturbation, the container plays a major role in the resonance and attenuation effects. Ultrasound interactions together to nonlinear optical phenomena in nanofluids is a promising alternative field for a wide of applications for modulating quantum signals, sensors and acousto-optic devices.

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Displacement reduction routed Au–Pt bimetallic nanoparticles: a highly durable electrocatalyst for methanol oxidation and oxygen reduction

Abstract: Au@Pt core@shell NPs were synthesized by a galvanic displacement reduction method and fabricated on an electrode surface for the investigation of methanol oxidation and oxygen reduction reactions.

Cited by 26 publications

References 41 publications

Tunable Assembly of Protein Enables Fabrication of Platinum Nanostructures with Different Catalytic Activity

Tunable Assembly of Protein Enables Fabrication of Platinum Nanostructures with Different Catalytic Activity

Electrochemical Scaffold Based on Silver Phosphate Nanoparticles for the Quantification of Acetaminophen in Body Fluids and Pharmaceutical Formulations

Ultrasonic Influence on Plasmonic Effects Exhibited by Photoactive Bimetallic Au-Pt Nanoparticles Suspended in Ethanol

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