Recent development of Au arched Pt nanomaterials as promising electrocatalysts for methanol oxidation reaction

Lou, Wenhua; Ali, Asad; Shen, Pei Kang

doi:10.1007/s12274-021-3461-5

Cited by 62 publications

(17 citation statements)

References 155 publications

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“…Compared to other bimetallic core–shell NCs, Au@Pt systems offer the amalgamation of the plasmonic properties of the core (Au) with the catalytic properties of the shell (Pt), resulting in improved catalytic activity and stability compared to the monometallic counterparts, along with the tunability of the optical properties. − To realize these advantages, the versatile seed-mediated method has been employed to generate simpler bimetallic structures using spherical, rod, cube, octahedral, prism, and star-shaped Au NCs as the core. − In recent years, Au NCs with high-index facets (HIFs), viz., high density of undercoordinated atoms on the surface, at steps and kinks, were realized as potential seeds for the subsequent deposition of Pt via the seed-mediated growth method. This has resulted in Au@Pt core–shell concave cube, concave cuboid (CCB), and hexoctahedral and tetrahexahedral NCs. − While the seed-mediated method is a facile route for the precise generation of bimetallic Au@Pt nanostructures, it is, however, always accompanied by tedious multi-step processes.…”

Section: Introductioncontrasting

confidence: 64%

Seed-Mediated Growth of Pt on High-Index Faceted Au Nanocrystals: The Ag Lining and Implications for Electrocatalysis

Pandikassala

Rajendra

Kurungot

et al. 2021

ACS Appl. Nano Mater.

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Bimetallic Au@Pt nanocrystals (NCs) offer a unique combination of plasmonic and catalytic properties and are a growing field of research. Herein, we report an unusual observation in the behavior of silver ions (Ag + ), which was found to play a dominant role in dictating the Pt deposition in a seed-mediated growth method. While the literature is replete with various instances of Ag-assisted Pt deposition whereby higher concentration of Ag + translates into a thicker Pt shell, in the present study, contradictory observations were made. In the presence of lower amounts of Ag + , thick Pt shells were visualized, while at higher concentrations of Ag + , the extent of Pt deposition via the galvanic replacement reaction was reduced. Additionally, the presence of Ag was deemed necessary for the Pt deposition to take place, either in the form of an underpotential deposition layer on the Au NCs or by introducing Ag + in the growth solution. We have demonstrated our findings on two different Au NCs enclosed with high-index facets, concave cuboid, and elongated tetrahexahedra, which mirror similar observations and provide generality to our claim. To the best of our knowledge, the time required for Pt deposition on the Au core in the present work is the least among the reported seed-mediated routes. Furthermore, this work, besides presenting a facile and general route for the amalgamation of catalytic and plasmonic properties in hybrid Pt−Au NCs, sheds light on the mechanistic aspects of Ag-assisted wet-chemical generation of bimetallic Au@Pt NCs. The overall electrocatalytic performance of our Au@Pt NCs toward the oxygen reduction reaction was realized to be impressive.

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Section: Introductioncontrasting

confidence: 64%

Seed-Mediated Growth of Pt on High-Index Faceted Au Nanocrystals: The Ag Lining and Implications for Electrocatalysis

Pandikassala

Rajendra

Kurungot

et al. 2021

ACS Appl. Nano Mater.

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“…First, the electrocatalysts used in the anode composition still rely on precious metals, which raises the cost of the DMFCs and, thus, limits their commercial use [ 8 ]. Second, the catalytic efficiency of catalysts based on noble metals such as platinum is still below the expected level due to the fact of their high susceptibility to poisoning by CO and HCO species [ 9 , 10 ]. So, there is a need to find alternative ways to overcome this problem and build anodes from nonprecious metals.…”

Section: Introductionmentioning

confidence: 99%

Molten Salts Approach of Poly(vinyl alcohol)-Derived Bimetallic Nickel–Iron Sheets Supported on Porous Carbon Nanosheet as an Effective and Durable Electrocatalyst for Methanol Oxidation

Thamer

Hameed

El‐Newehy

2023

Gels

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The preparation of metallic nanostructures supported on porous carbon materials that are facile, green, efficient, and low-cost is desirable to reduce the cost of electrocatalysts, as well as reduce environmental pollutants. In this study, a series of bimetallic nickel–iron sheets supported on porous carbon nanosheet (NiFe@PCNs) electrocatalysts were synthesized by molten salt synthesis without using any organic solvent or surfactant through controlled metal precursors. The as-prepared NiFe@PCNs were characterized by scanning and transmission electron microscopy (SEM and TEM), X-ray diffraction, and photoelectron spectroscopy (XRD and XPS). The TEM results indicated the growth of NiFe sheets on porous carbon nanosheets. The XRD analysis confirmed that the Ni1−xFex alloy had a face-centered polycrystalline (fcc) structure with particle sizes ranging from 15.5 to 30.6 nm. The electrochemical tests showed that the catalytic activity and stability were highly dependent on the iron content. The electrocatalytic activity of catalysts for methanol oxidation demonstrated a nonlinear relationship with the iron ratio. The catalyst doped with 10% iron showed a higher activity compared to the pure nickel catalyst. The maximum current density of Ni0.9Fe0.1@PCNs (Ni/Fe ratio 9:1) was 190 mA/cm2 at 1.0 M of methanol. In addition to the high electroactivity, the Ni0.9Fe0.1@PCNs showed great improvement in stability over 1000 s at 0.5 V with a retained activity of 97%. This method can be used to prepare various bimetallic sheets supported on porous carbon nanosheet electrocatalysts.

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“…20,21 Several metal oxides such as MnO 2 , RuO 2 , IrO 2, and MoO 2 are claimed in numerous studies as electrocatalyst for methanol oxidation reaction (MOR); they bring significant features in the electrochemical properties of Pt. 22,23 Ni nanoparticles have gained considerable focus due to their low cost and high MOR activity; with regards to Ni-based electrocatalyst, their MOR activity is due to the conversion of Ni (2+) to Ni (3+) and vice versa. 24,25 Economics is the serious parameter in the choice of catalyst and now researchers are interested in finding the alternative of the precious metal as they are less available and they hinder the commercialization of DMFC, 26 one of the economical, stable, and highly active catalysts reported in the literature for the oxidation of methanol is NiCo 2 O 4 supported on graphene oxide.…”

Section: Introductionmentioning

confidence: 99%

“…However, Pt‐Ru is considered as the best binary catalyst among them and adsorbs and activates water on the Pt surface and plays important role in the oxidation of CO adsorbed on the surface to CO 2 20,21 . Several metal oxides such as MnO 2 , RuO 2 , IrO 2, and MoO 2 are claimed in numerous studies as electrocatalyst for methanol oxidation reaction (MOR); they bring significant features in the electrochemical properties of Pt 22,23 …”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic study of cu/NiMOFand itsg‐C₃N₄composites for methanol oxidation reaction

Abbasi

Nооr

Iqbal

et al. 2022

Intl J of Energy Research

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Summary Graphitic carbon nitride is of interest for its intercalation, ion exchange, and redox properties as it exhibits high catalytic activity. Besides, its high nitrogen content and facile synthesis procedure may provide a good balance between activity and durability. We report novel g‐C3N4 based MOF as a novel electrocatalyst for methanol oxidation reaction (MOR). Two methods are involved in the catalytic synthesis, namely the hydrothermal method for the Cu/Ni MOF and its composites synthesis, and g‐C3N4 is obtained by pyrolysis of melamine. To explore the structural and morphological properties, all the catalysts were eventually characterized using XRD, FTIR, SEM, and EDX techniques, whereas cyclic voltammetry (CV) revealed the electrochemical response for the oxidation of methanol in 3 M methanol and 1 M NaOH on modified glassy carbon electrode (GCE). The electrochemical results illustrate that as the amount of g‐C3N4 increases current density for methanol oxidation reaction (MOR). The maximum current density is 103.42 mA/cm2 shown by Cu/Ni MOF@5 wt% g‐C3N4 at 0.9 V while the scan rate is 50 mV/s. Thus, graphitic carbon nitride addition in MOF composites enhanced its durability and high carbon monoxide (CO) tolerance makes active catalysts in alkaline electrolyte.

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Recent development of Au arched Pt nanomaterials as promising electrocatalysts for methanol oxidation reaction

Cited by 62 publications

References 155 publications

Seed-Mediated Growth of Pt on High-Index Faceted Au Nanocrystals: The Ag Lining and Implications for Electrocatalysis

Seed-Mediated Growth of Pt on High-Index Faceted Au Nanocrystals: The Ag Lining and Implications for Electrocatalysis

Molten Salts Approach of Poly(vinyl alcohol)-Derived Bimetallic Nickel–Iron Sheets Supported on Porous Carbon Nanosheet as an Effective and Durable Electrocatalyst for Methanol Oxidation

Electrocatalytic study of cu/NiMOFand itsg‐C₃N₄composites for methanol oxidation reaction

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Recent development of Au arched Pt nanomaterials as promising electrocatalysts for methanol oxidation reaction

Cited by 62 publications

References 155 publications

Seed-Mediated Growth of Pt on High-Index Faceted Au Nanocrystals: The Ag Lining and Implications for Electrocatalysis

Seed-Mediated Growth of Pt on High-Index Faceted Au Nanocrystals: The Ag Lining and Implications for Electrocatalysis

Molten Salts Approach of Poly(vinyl alcohol)-Derived Bimetallic Nickel–Iron Sheets Supported on Porous Carbon Nanosheet as an Effective and Durable Electrocatalyst for Methanol Oxidation

Electrocatalytic study of cu/NiMOFand itsg‐C3N4composites for methanol oxidation reaction

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Electrocatalytic study of cu/NiMOFand itsg‐C₃N₄composites for methanol oxidation reaction