Sonochemical Formation of Ga-Pt Intermetallic Nanoparticles Embedded in Graphene and its Potential Use as an Electrocatalyst

Kumar, Vijay Bhooshan; Sanetuntikul, Jakkid; Ganesan, P.; Porat, Ze’ev; Shanmugam, Sangaraju; Gedanken, Aharon

doi:10.1016/j.electacta.2015.12.193

Cited by 36 publications

(33 citation statements)

References 37 publications

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“…Recent studies have reported gallium (Ga) has positive effects on activity of Pt and Ni catalyst for electrochemical reactions. Kumar et al showed Ga–Pt intermetallic nanoparticles had higher catalytic activity toward ORR and methanol oxidation reaction than Pt . Studt et al presented Ni–Ga intermetallic compounds as stable candidates with good activity for reduction of CO 2 to methanol .…”

Section: Methodsmentioning

confidence: 99%

Ga–Doped Pt–Ni Octahedral Nanoparticles as a Highly Active and Durable Electrocatalyst for Oxygen Reduction Reaction

et al. 2018

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Bimetallic PtNi nanoparticles have been considered as a promising electrocatalyst for oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells (PEMFCs) owing to their high catalytic activity. However, under typical fuel cell operating conditions, Ni atoms easily dissolve into the electrolyte, resulting in degradation of the catalyst and the membrane-electrode assembly (MEA). Here, we report gallium-doped PtNi octahedral nanoparticles on a carbon support (Ga-PtNi/C). The Ga-PtNi/C shows high ORR activity, marking an 11.7-fold improvement in the mass activity (1.24 A mg) and a 17.3-fold improvement in the specific activity (2.53 mA cm) compared to the commercial Pt/C (0.106 A mg and 0.146 mA cm). Density functional theory calculations demonstrate that addition of Ga to octahedral PtNi can cause an increase in the oxygen intermediate binding energy, leading to the enhanced catalytic activity toward ORR. In a voltage-cycling test, the Ga-PtNi/C exhibits superior stability to PtNi/C and the commercial Pt/C, maintaining the initial Ni concentration and octahedral shape of the nanoparticles. Single cell using the Ga-PtNi/C exhibits higher initial performance and durability than those using the PtNi/C and the commercial Pt/C. The majority of the Ga-PtNi nanoparticles well maintain the octahedral shape without agglomeration after the single cell durability test (30,000 cycles). This work demonstrates that the octahedral Ga-PtNi/C can be utilized as a highly active and durable ORR catalyst in practical fuel cell applications.

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Section: Methodsmentioning

confidence: 99%

Ga–Doped Pt–Ni Octahedral Nanoparticles as a Highly Active and Durable Electrocatalyst for Oxygen Reduction Reaction

et al. 2018

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“…In addition to the aforementioned common intermetallic nanocatalysts, some other Pt‐based ordered nanocrystals with unusual composition have also been explored for fuel cells‐based electrocatalysis such as PtZr,[6b] PtSn, PtNi, PtCr, PtAl,[6c] PtGa, PtIrCo, PtCoCr, PtAuCu[11b] and so on. Most of these intermetallic electrocatalysts exhibited enhanced catalytic performance, especially in terms of durability, towards either the oxidation of various fuels or the reduction of oxygen compared to their disordered counterparts or benchmark Pt/C catalyst, thus highlighting the importance of turning disordered structure into ordered intermetallic phase in boosting electrocatalysis.…”

Section: Ordered Intermetallic Pt‐based Catalystsmentioning

confidence: 99%

Tuning Multimetallic Ordered Intermetallic Nanocrystals for Efficient Energy Electrocatalysis

Luo

Sun

Wang

et al. 2016

Advanced Energy Materials

150

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Ordered intermetallic alloys have attracted extensive attention as advanced electrocatalysts for polymer electrolyte membrane fuel cells (PEMFCs) reactions with much improved activity and stability. Here, latest progress in tuning intermetallic Pt‐ and Pd‐based nanocrystals with tunable morphology and structure for catalyzing both the cathodic reduction of oxygen and anodic oxidation of fuels (e.g., methanol, ethanol and formic acid) in PEMFCs is highlighted. Making/tuning interesting intermetallic PtM (M = Fe, Co, Pb, Cu, etc.)‐based nanocrystals for boosting oxygen reduction reaction with high activity and stability by using/controlling high‐temperature annealing treatment is discussed. In all the reported Pt‐based intermetallic nanocrystals, controlling the degree of ordering under the proper high temperature treatment is the key for achieving the optimized electrocatalysis. In order to search for cheaper catalysts, the progress on making Pd‐based intermetallic nanocrystals is also discussed. Furthermore, future research directions are proposed and discussed to further enhance the efficiency of such unique intermetallic multimetallic nanocatalysts. This report aims to demonstrate the potential of ordered intermetallic strategy for boosting electrocatalysis and stimulating more research efforts in this field.

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“…Therefore, the PtGa/C electrocatalyst may be more selective for the formation of more oxidized species such as acetic acid and CO 2 compared with Pt 100 /C. According to Kumar et al [ 26 ] the addition of gallium may modify the center of the d-band of the Pt metal. The d-band center shifts up to the Fermi level as compared to the parent metals via combination with a second metal over layering the Pt surface, resulting in an increase in the absorbate binding energy and thus promoting the performance of intermetallic for the CO oxidation.…”

Section: Resultsmentioning

confidence: 99%

“…Kumar et al [26] recently found that the PtGa/graphene showed better activity for methanol oxidation reaction and oxygen oxidation reaction than a commercial Pt/C catalyst. PtGa alloy decreased the CO electrooxidation potential in 0.2 V versus ERH compared to pure platinum.…”

Section: Introductionmentioning

confidence: 99%

“…The paper proposed by Hogarth and Ralph [ 25 ] reported that the PtGa/C electrocatalyst showed a promotional effect toward methanol oxidation reaction in acid electrolyte, reducing the alcohol oxidation potential when compared Pt, PtOs, PtPd, PtIr, PtW, and PtRh. Kumar et al [ 26 ] recently found that the PtGa/graphene showed better activity for methanol oxidation reaction and oxygen oxidation reaction than a commercial Pt/C catalyst. PtGa alloy decreased the CO electrooxidation potential in 0.2 V versus ERH compared to pure platinum.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical and Morphological Investigations of Ga Addition to Pt Electrocatalyst Supported on Carbon

Paganoto¹,

Santos

Evangelista³

et al. 2017

The Scientific World Journal

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This paper is consisted in the synthesis of platinum-based electrocatalysts supported on carbon (Vulcan XC-72) and investigation of the addition of gallium in their physicochemical and electrochemical properties toward ethanol oxidation reaction (EOR). PtGa/C electrocatalysts were prepared through thermal decomposition of polymeric precursor method at a temperature of 350°C. Six different compositions were homemade: Pt50Ga50/C, Pt60Ga40/C, Pt70Ga30/C, Pt80Ga20/C, Pt90Ga10/C, and Pt100/C. These electrocatalysts were electrochemically characterized by cyclic voltammetry (CV), chronoamperometry (CA), chronopotentiometry (CP), and electrochemical impedance spectroscopy (EIS) in the presence and absence of ethanol 1.0 mol L−1. Thermogravimetric analysis (TGA), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and transmission electron microscopy (TEM) were also carried out for a physicochemical characterization of those materials. XRD results showed the main peaks of face-centered cubic Pt. The particle sizes obtained from XRD and TEM analysis range from 7.2 nm to 12.9 nm. The CV results indicate behavior typical of Pt-based electrocatalysts in acid medium. The CV, EIS, and CA data reveal that the addition of up to 31% of gallium to the Pt highly improves catalytic activity on EOR response when compared to Pt100/C.

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Sonochemical Formation of Ga-Pt Intermetallic Nanoparticles Embedded in Graphene and its Potential Use as an Electrocatalyst

Cited by 36 publications

References 37 publications

Ga–Doped Pt–Ni Octahedral Nanoparticles as a Highly Active and Durable Electrocatalyst for Oxygen Reduction Reaction

Ga–Doped Pt–Ni Octahedral Nanoparticles as a Highly Active and Durable Electrocatalyst for Oxygen Reduction Reaction

Tuning Multimetallic Ordered Intermetallic Nanocrystals for Efficient Energy Electrocatalysis

Electrochemical and Morphological Investigations of Ga Addition to Pt Electrocatalyst Supported on Carbon

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