Methanol Oxidation and Oxygen Reduction Activity of PtIrCo-Alloy Nanocatalysts Supercritically Deposited within 3D Carbon Aerogel Matrix

Kolla, Praveen; Smirnova, Alevtina

doi:10.1016/j.electacta.2015.09.033

Cited by 36 publications

(19 citation statements)

References 51 publications

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“…Chemical synthesis, including the chemical reduction methods in aqueous solution [55,56] or in organic solvents, [57][58][59] is common bottom-up assembly approach used to fabricate amorphous alloys apart from the fast cooling methods mentioned above. Unlike the fast cooling processes, the chemical reduction method is not limited by the glass forming ability of the components from solution.…”

Section: Chemical Synthesismentioning

confidence: 99%

“…[12] In order to further develop higher surface area MGNs, dealloying is considered as www.advmat.de www.advancedsciencenews.com the subtractive surface modification technique since it allows the exposure of the inner active sites through porosity formation. The knowledge gained from the thin film MG library was used to explain why Pt-BMG(42) yielded a better dealloying effect than Pt-BMG (57). The parting limit is defined as the threshold when the selective dissolution is made possible, [80] i.e., further dealloying will not further increase the surface area.…”

Section: Surface Modification Techniquesmentioning

confidence: 99%

“…Doubek et al reported an ECSA of ≈20 m 2 Ptg −1 for nanoporous nanorods, [12] Gumeci et al ≈20-30 m 2 Ptg −1 for sonochemically prepared nanoparticles, [41] Kolla and Smirnova Adv. a) Reported values of onset potential and current density for ORR in RDE experiments from references, a (PdCuSi), [125] b (Pd-NiB/C), [55] c (Ni59Nb40PtxM1-x (M = Ru, Sn)), [126] d (Pt 42.5 Cu 27 Ni 9.5 P 21 ), [12] e (PtCu 3 ), [41] f (PtIrCo/C), [57] g (AgCu). 2019, 31, 1802120 Figure 13.…”

Section: Orrmentioning

confidence: 99%

“…[57] The reader should note that compared to the ECSA from a nanodispersed Pt/C (≈60 m 2 Ptg −1 ), most 3D-N MG have lower values and as a consequence, high current density values should not be favored. [57] The reader should note that compared to the ECSA from a nanodispersed Pt/C (≈60 m 2 Ptg −1 ), most 3D-N MG have lower values and as a consequence, high current density values should not be favored.…”

Section: Orrmentioning

confidence: 99%

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Recent Advances in Metallic Glass Nanostructures: Synthesis Strategies and Electrocatalytic Applications

Doubek

McMillon‐Brown

et al. 2018

Advanced Materials

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transformers [2] and load bearing applications. [3] In the last few decades, the study of nanomaterials has become a central focus in nanoscience and nanotechnology. [4] In fact, many studies have shown that with reduction in size, nanomaterials display novel electrical, mechanical, chemical and optical properties, which are largely believed to be the result of surface and quantum confinement effects. [4,5] Remarkably, this trend has found traction in the metallic glass field where metallic glasses nanostructures (MGNs) demonstrate an important role in many applications such as light harvesting, [6] photovoltaic, [7] biomedical, [8] magneto-optical, [9] organic synthesis, [10] lithium-ion batteries [11] and electrocatalysis. [12] Recently, MGNs are receiving increased attention due to their distinguished performance, such as high activity and long term stability in electrocatalytic reactions. [12,13] Although several review papers have already covered the topic of nanopatterning of bulk metallic glasses (BMGs), [14][15][16] the correlation between recent synthetic methods and electrocatalytic applications for MGNs has not been thoroughly addressed. Moreover, there is currently no review that unites MGNs synthesized from different approaches (top-down and bottom-up) with conventional electrochemical reactions. Therefore, in this review our mission is to: 1) present a focused perspective on the latest fabrication techniques of MGNs toward the pursuit of novel electrocatalysts and electrodes; 2) highlight recent advances in computational screening and predictions that could be applied toward new metallic glass electrocatalyst discovery; and 3) report distinct advancements in electrocatalytic applications related to MGNs by creating a comprehensive discussion for commonly employed kinetic parameters and their connection with the unique material structure. Finally, as the first progress report on the metallic glass based electrocatalysts, we will also highlight some of the challenges that need to be addressed toward future progress in this field.BMGs are those metallic glasses (MGs) that can be made in 'bulk' scale with good glass forming abilities, [17] representing a versatile platform for many applications. To date, a wide range of BMG-forming alloys have been developed, including Zr-, [18] Fe-, [19] Cu-, [20] Ni-, [21] Ti-, [22] Mg-, [23] Pd-, [24] Au-, [25] and Pt-based compositions. [26] Moreover, the increased disorder brought by the higher degree of multinary systems is believed to contribute to improving the glass formation. [27] The evolution to multicomponent alloys of the most recent MG studies has also made them natural candidates for catalysis. The amorphous multinary Recent advances in metallic glass nanostructures (MGNs) are reported, covering a wide array of synthesis strategies, computational discovery, and design solutions that provide insight into distinct electrocatalytic applications. A brief introduction to the development and unique features of MGNs with an overview of top-down and bottom-up sy...

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Section: Chemical Synthesismentioning

confidence: 99%

Section: Surface Modification Techniquesmentioning

confidence: 99%

Section: Orrmentioning

confidence: 99%

Section: Orrmentioning

confidence: 99%

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Recent Advances in Metallic Glass Nanostructures: Synthesis Strategies and Electrocatalytic Applications

Doubek

McMillon‐Brown

et al. 2018

Advanced Materials

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“…This can result in a loss in the oxygen reduction reaction (ORR) activity as well as in membrane degradation, leading to a decrease in the cell potential by as much as 200 mV. [6][7][8] Pt x Ir y has been proposed as a promising alternative to Pt x Ru y , as Ir is more resistant to dissolution 9,10 than Ru and as the presence of Ir has been reported to enhance the MOR activity (vs. Pt alone) in binary, [11][12][13][14][15][16][17] ternary, 16,18,19 and quaternary 20 alloy catalysts. Contrary to Pt-Ru, Pt x Ir y has also been reported to have good catalytic activity toward the oxygen reduction reaction (ORR), which occurs at the DMFC cathode.…”

mentioning

confidence: 99%

Understanding the Role of Ir during Methanol Oxidation at Pt_xIr_yAlloy Nanoparticles

Sawy

Birss

2017

J. Electrochem. Soc.

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The formation of Pt x Ir y alloy nanoparticles (NPs), having a controlled bulk and surface composition over a wide range of Ir content (35-90 at% Ir), was reported in our recent work. While this prior work did examine the activity of these NPs toward the methanol oxidation reaction (MOR), this was done only per mass of catalyst and only under RT conditions. Here, the MOR activity is reported based on the real surface area of the NPs, determined using several electrochemical methods as well as TEM analysis, in both room temperature (RT) and 60 • C methanol-containing 0.5 M H 2 SO 4 solutions. These more comprehensive results suggest that the bi-functional effect of Ir on Pt activity plays the most significant role in catalyzing the MOR, with the optimum Ir content found to be ca. 35 at% and 50 at% at low and high potentials, respectively, at both temperatures. This demonstrates that less Ir is needed when the CO production rate is low, as is the case for methanol oxidation at the low potentials desired in operating direct methanol fuel cells.

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Promoting Electrocatalysis upon Aerogels

2018

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Electrocatalysis plays a prominent role in renewable energy conversion and storage, enabling a number of sustainable processes for future technologies. There are generally three strategies to improve the efficiency (or activity) of the electrocatalysts: i) increasing the intrinsic activity of the catalyst itself, ii) improving the exposure of active sites, and iii) accelerating mass transfer during catalysis (both reactants and products). These strategies are not mutually exclusive and can ideally be addressed simultaneously, leading to the largest improvements in activity. Aerogels, as featured by large surface area, high porosity, and self‐supportability, provide a platform that matches all the aforementioned criteria for the design of efficient electrocatalysts. The field of aerogel synthesis has seen much progress in recent years, mainly thanks to the rapid development of nanotechnology. Employing precursors with different properties enables the resulting aerogel with targeted catalytic properties and improved performances. Here, the design strategies of aerogel catalysts are demonstrated, and their performance for several electrochemical reactions is reviewed. The common principles that govern electrocatalysis are further discussed for each category of reactions, thus serving as a guide to the development of future aerogel electrocatalysts.

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Methanol Oxidation and Oxygen Reduction Activity of PtIrCo-Alloy Nanocatalysts Supercritically Deposited within 3D Carbon Aerogel Matrix

Cited by 36 publications

References 51 publications

Recent Advances in Metallic Glass Nanostructures: Synthesis Strategies and Electrocatalytic Applications

Recent Advances in Metallic Glass Nanostructures: Synthesis Strategies and Electrocatalytic Applications

Understanding the Role of Ir during Methanol Oxidation at Pt_xIr_yAlloy Nanoparticles

Promoting Electrocatalysis upon Aerogels

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Methanol Oxidation and Oxygen Reduction Activity of PtIrCo-Alloy Nanocatalysts Supercritically Deposited within 3D Carbon Aerogel Matrix

Cited by 36 publications

References 51 publications

Recent Advances in Metallic Glass Nanostructures: Synthesis Strategies and Electrocatalytic Applications

Recent Advances in Metallic Glass Nanostructures: Synthesis Strategies and Electrocatalytic Applications

Understanding the Role of Ir during Methanol Oxidation at PtxIryAlloy Nanoparticles

Promoting Electrocatalysis upon Aerogels

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Understanding the Role of Ir during Methanol Oxidation at Pt_xIr_yAlloy Nanoparticles