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

Paganoto, Giordano T.; Santos, Deise Menezes; Evangelista, Tereza Cristina Santos; Guimarães, Marco César Cunegundes; Carneiro, Maria Tereza Weitzel Dias; Ribeiro, Josimar

doi:10.1155/2017/8786013

Cited by 6 publications

(4 citation statements)

References 43 publications

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“…Besides, such observation is also well consistent with the previous reports concerning the XRD patterns of PtGa composites. 35,36 From these characterizations, we thus deduced that the PtGa alloy NWs were formed by continuous incorporation of Ga into the Pt NW seeds.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

Unconventional p–d Hybridization Interaction in PtGa Ultrathin Nanowires Boosts Oxygen Reduction Electrocatalysis

et al. 2019

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Alloying 3d transition metals with Pt has been discovered as an effective strategy to boost the catalytic activity in oxygen reduction reaction (ORR), which, however, often raises the insufficient catalyst durability issue due to rapid leaching of the 3d metal elements. To overcome this issue and realize enhancements in both the activity and the durability properties, here we report a new catalytic structure based on PtGa ultrathin alloy nanowires (NWs), which feature an unconventional strong p−d hybridization interaction. Relative to commercial Pt catalyst, the optimum Pt 4.31 Ga NWs catalyst exhibited 10.5-and 12.1-fold enhancement in the ORR mass activity and specific activity, respectively. Particularly, the Pt 4.31 Ga NWs catalyst showed only 15.8% loss in the mass activity after 30 000 cycles of durability test, as compared to a big decrease of 79.6% for the commercial Pt catalyst. Our mechanistic studies find a strong p−d hybridization interaction between Ga and Pt that accounts for the improved ORR performance via synergistically optimizing the surface electronic structure, enhancing the oxidation resistance of Pt, and suppressing the leaching of lattice Ga. We believe this work provides new perspectives to design active and durable electrocatalysts toward ORR.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Unconventional p–d Hybridization Interaction in PtGa Ultrathin Nanowires Boosts Oxygen Reduction Electrocatalysis

et al. 2019

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“…β-Ga 2 O 3 became a dominant material in the semiconducting industry, especially in power device applications, due to its fascinating wide band gap (4.9 eV) with very high breakdown potential (∼8 MV/cm) . β-Ga 2 O 3 is also known for its abundant surface medium–strong Lewis acid sites which has a significant effect on its catalytic behavior, and few reports are available demonstrating addition of gallium to Pt based catalyst for methanol oxidation, methanol oxidation coupled with oxygen reduction, and ethanol oxidation reaction. However, the authors have not come across any such reports on electrospun β-Ga 2 O 3 nanofibers for bifunctional electrochemical catalysis, particularly HER and ORR.…”

Section: Introductionmentioning

confidence: 99%

Gallium Oxide Nanofibers for Hydrogen Evolution and Oxygen Reduction

Kakoria¹,

Devi²,

Anand³

et al. 2018

ACS Appl. Nano Mater.

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An effective, cost-efficient catalyst material that can replace platinum as electrode material in fuel cell has become the focus point of non-fossil fuel based alternate energy systems. Transition/post-transition metal oxide based catalyst development is now the thrust area in the above-mentioned context for efficient energy conversions, especially oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). Here, for the first time, application of electrospun β-gallium oxide (β-Ga2O3) nanofibers, a post-transition metal oxide, as an efficient bifunctional catalyst material is reported. These nanofibers are highly porous (specific surface area ∼100–300 m2/g) and exhibit a mesoporous architecture (pore size ∼1.5–2 nm) which facilitates better ion transport through the spongy morphology of individual nanofiber. The fabricated β-Ga2O3 nanofibers performed at par with the Pt/C catalyst, like for ORR the onset potential was 0.84 V (vs RHE) and for HER, although the onset potential was −0.34 V (vs RHE), the current density was visibly better than the latter catalyst. This catalyst also performed much better in methanol tolerance test and was near similar in current retention for 6 h, as measured in chronoamperometry. This performance was solely attributed to the large surface area and unique morphology presented by the material, via a rather simple fabrication technique, without addition of any dopant material.

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“…Gallium (Ga) element is inexpensive compared to the noble metal such as Pt 156 with low toxicity and melting point properties while easily incorporated into microscale channels made Ga an interesting electrode material. 157 Ga's presence weakens the interaction between CO species and noble metal active site 145 while exhibits a promotional effect toward alcohol oxidation reaction when combined with noble metal. 157 Wang et al 18 successfully fabricated nanoporous Pt-Ga alloy film supported on Pt foil and found that the poison carbonaceous intermediates adsorption on the nanoporous Pt-Ga foil was found to be weaker than Pt foil, which indicated that Ga presence also enhanced CO-tolerance.…”

Section: Development Of Pt-based and Pdbased Catalyst With Gallium Metalmentioning

confidence: 99%

“…157 Ga's presence weakens the interaction between CO species and noble metal active site 145 while exhibits a promotional effect toward alcohol oxidation reaction when combined with noble metal. 157 Wang et al 18 successfully fabricated nanoporous Pt-Ga alloy film supported on Pt foil and found that the poison carbonaceous intermediates adsorption on the nanoporous Pt-Ga foil was found to be weaker than Pt foil, which indicated that Ga presence also enhanced CO-tolerance. The nanoporous structure was observed to retain its structure after 4000 cycles, which proved improved stability even under harsh testing conditions.…”

Section: Development Of Pt-based and Pdbased Catalyst With Gallium Metalmentioning

confidence: 99%

Research and innovation in the electrocatalyst development toward glycerol oxidation reaction

2021

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Direct glycerol fuel cell (DGFCs) is an interesting type of fuel cell that can produce energy and high-end chemicals using excess and less expensive fuel, glycerol. The commercialization of DGFCs meets with many challenges, especially on its catalyst development. Common catalysts usually tested in DGFCs are platinum-based (Pt) and palladium-based catalyst (Pd). The expensive value of the noble metal such as Pt and Pd becomes a limitation towards the commercialization. This review shows and summarizes numerous improvements achieved on the anode catalyst for GOR to reduce the noble metal dependency while maximizing the activity performance, durability-stability, and GOR yield selectivity on certain valuable chemicals introducing multiple optimized syntheses methods with timesaving and cost-effective benefits. Finally, this review proposes the next direction of catalyst development to be taken in the future based on the recent developments and innovations implemented and tested.

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

Cited by 6 publications

References 43 publications

Unconventional p–d Hybridization Interaction in PtGa Ultrathin Nanowires Boosts Oxygen Reduction Electrocatalysis

Unconventional p–d Hybridization Interaction in PtGa Ultrathin Nanowires Boosts Oxygen Reduction Electrocatalysis

Gallium Oxide Nanofibers for Hydrogen Evolution and Oxygen Reduction

Research and innovation in the electrocatalyst development toward glycerol oxidation reaction

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