PtIr/C Catalysts Synthesized by Electrochemical Dispersion Method for Proton Exchange Membrane Fuel Cells

Kuriganova, Alexandra B.; Leont’ev, I. N.; Smirnova, N. V.

doi:10.1134/s1023193518060113

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…20,21 However, also other Pt-based bimetallic electrocatalysts are investigated for PEMFCs like PtIr. 22 Ir is equally scarce and recently has become even more expensive than Pt. 23 The motivation behind developing PtIr catalysts is not necessarily the optimization of the binding energy of reaction intermediates but rather the fact that Iroxide is an active catalyst for the oxygen evolution reaction (OER).…”

Section: ■ Introductionmentioning

confidence: 99%

“…In proton exchange membrane fuel cells (PEMFCs), most conversion losses arise at the cathode where the oxygen reduction reaction (ORR) takes place . The electrocatalyst of choice for the cathode currently consists of bimetallic Pt nanoparticles (NPs), mainly PtCo, immobilized onto a carbon support. , The alloying optimizes the adsorption strength of the ORR reaction intermediates (O ad , OH ad , and OOH ad ) on Pt and thus the ORR rate. , However, also other Pt-based bimetallic electrocatalysts are investigated for PEMFCs like PtIr . Ir is equally scarce and recently has become even more expensive than Pt .…”

Section: Introductionmentioning

confidence: 99%

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Bifunctional Pt-IrO₂ Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles versus Nanocomposite Catalysts

Quinson

Zhang

et al. 2021

ACS Catal.

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In the present study, different concepts for the development of bifunctional oxygen reduction reaction/oxygen evolution reaction (ORR/OER) electrocatalysts are explored and compared. Bifunctional ORR/OER catalysts are often suggested to improve the stability during startup and shutdown of fuel cells. Furthermore, they have been proposed for the so-called unitized regenerative fuel cells (URFCs) that would allow a closed loop system to use and produce hydrogen on demand. We compare the electrocatalytic performance of conventional Pt x Ir y alloy nanoparticles (NPs) with Pt–IrO2 NP composites (nanocomposites), both immobilized onto a commercial carbon support. The Pt–IrO2 nanocomposites thereby consist of a mixture of Pt NPs and IrO2 NPs. By probing the electrocatalytic performance before and after exposing the electrocatalysts to accelerated degradation tests (ADTs), it is shown that the Pt–IrO2 nanocomposite concept offers advantages but also some disadvantages over the conventional alloy concept. In particular, it is shown that while the nanocomposites are initially less active for the ORR because of an interparticle effect, their performance is less affected by the ADTs. However, all the tested catalysts experience a decline of the Ir/Pt ratio upon ADT treatment, highlighting the limiting value of Ir as an OER catalyst for startup–shutdown protection in fuel cells as well as the challenging stability requirements for URFCs.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bifunctional Pt-IrO₂ Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles versus Nanocomposite Catalysts

Quinson

Zhang

et al. 2021

ACS Catal.

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“…To date, various electrode materials including carbon materials, redox active polymers and metallic nanomaterials have been attached onto a glassy carbon electrode to attain better sensitivity and selectivity. Among them, current investigation focus more on carbon materials, such as amorphous carbon, [7] carbon nanotubes, [8] and graphene, [9] because of their superior chemical stability and adsorptivity. Acetylene black (AB) is particularly pure form of graphitic, carbon black pigment, formed by thermal decomposition of acetylene in air under pressure.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Detection of Catechol and Hydroquinone Using Acetylene Black and Gold Nanoparticle Composite Modified Electrodes

Zhu

Wang

et al. 2022

ChemistrySelect

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Quantitative analysis of dihydroxybenzene isomers holds great significance to agricultural chemistry, food safety and environmental protection. In this work, we demonstrate a facile strategy to determine catechol and hydroquinone by using acetylene black and gold nanoparticle composite modified electrodes (Au/AB/GCE). Compared with bare glassy carbon electrode (GCE), Au/AB/GCE showed much better performance in electrocatalytic oxidation-reduction of catechol and hydroquinone. The linear correlation between the peak currents and analyte concentrations suggested the simultaneous detection with ultralow limits of detection (0.5 μM and 1 μM for catechol and hydroquinone, respectively). Besides, the determination is selective and out of interference of common inorganic ions and organic compounds. Anson equation was employed to make a reasonable hypothesis, that the increased surface area and electrical conductivity of Au/AB/GCE contributed these good results. This strategy may become a promising means for ratiometric and simultaneous detection of catechol and hydroquinone in water with convenience and high sensitivity.

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“…20,21 However, also other Pt-based bimetallic electrocatalysts are investigated for PEMFCs like PtIr. 22 Ir is equally scarce and recently even more expensive than Pt. 23 The motivation behind developing PtIr catalysts is not necessarily the optimization of the binding energy of reaction intermediates but rather the fact that Ir-oxide is an active catalyst for the oxygen evolution reaction (OER).…”

Section: Introductionmentioning

confidence: 99%

Bifunctional Pt-IrO2 Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles vs. Nanocomposite Catalysts

Du¹,

Quinson²,

Zhang³

et al. 2020

Preprint

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In the present study different concepts for the development of bifunctional oxygen reduction reaction / oxygen evolution reaction (ORR / OER) electrocatalysts are explored and compared. Bifunctional ORR / OER catalysts are often suggested to improve the stability during startup and shutdown of fuel cells. Furthermore, they are proposed for so-called unitized regenerative fuel cells (URFCs) that would allow a closed loop system to use and produce hydrogen on demand. We compare the electrocatalytic performance of conventional PtxIry alloy nanoparticles (NPs) with Pt – IrO2 NP composites (nanocomposites), both immobilized onto a commercial carbon support. The Pt – IrO2 nanocomposites thereby consist of a mixture of Pt NPs and IrO2 NPs. By probing the electrocatalytic performance before and after exposing the electrocatalysts to accelerated degradation tests (ADTs) it is shown that the Pt – IrO2 nanocomposite concept offers advantages but also some disadvantages over the conventional alloy concept. In particular it is shown that while the nanocomposites are initially less active for the ORR due to an interparticle effect, their performance is less affected by the ADTs. However, all tested catalysts experience a decline of the Ir / Pt ratio upon the ADTs treatment, highlighting the challenging stability requirements for URFCs.

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PtIr/C Catalysts Synthesized by Electrochemical Dispersion Method for Proton Exchange Membrane Fuel Cells

Cited by 7 publications

References 16 publications

Bifunctional Pt-IrO₂ Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles versus Nanocomposite Catalysts

Bifunctional Pt-IrO₂ Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles versus Nanocomposite Catalysts

Simultaneous Detection of Catechol and Hydroquinone Using Acetylene Black and Gold Nanoparticle Composite Modified Electrodes

Bifunctional Pt-IrO2 Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles vs. Nanocomposite Catalysts

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PtIr/C Catalysts Synthesized by Electrochemical Dispersion Method for Proton Exchange Membrane Fuel Cells

Cited by 7 publications

References 16 publications

Bifunctional Pt-IrO2 Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles versus Nanocomposite Catalysts

Bifunctional Pt-IrO2 Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles versus Nanocomposite Catalysts

Simultaneous Detection of Catechol and Hydroquinone Using Acetylene Black and Gold Nanoparticle Composite Modified Electrodes

Bifunctional Pt-IrO2 Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles vs. Nanocomposite Catalysts

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Bifunctional Pt-IrO₂ Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles versus Nanocomposite Catalysts

Bifunctional Pt-IrO₂ Catalysts for the Oxygen Evolution and Oxygen Reduction Reactions: Alloy Nanoparticles versus Nanocomposite Catalysts