Investigating the oxygen evolution reaction on Ir(111) electrode in acidic medium using conventional and dynamic electrochemical impedance spectroscopy

Scohy, Marion; Montella, C.; Claudel, Fabien; Abbou, Sofyane; Dubau, Laëtitia; Maillard, Frédéric; Sibert, Éric; Sunde, Svein

doi:10.1016/j.electacta.2019.07.047

Cited by 12 publications

(4 citation statements)

References 66 publications

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“…Accordingly, Figure S6 shows that the potential always exceeded 1.6 V versus RHE and that the time required to reach the cutoff voltage was always less for the unsupported IrO x catalysts during the galvanostatic AST, especially for those that were thermally annealed. In contrast, the catalysts featuring a high ASD (e.g., nonannealed supported IrO x nanocatalysts) or those which were intrinsically very active toward the OER (e.g., anodically formed Ir oxide on thin-films or single crystals 15,38 ) electrocatalysed the OER at lower overpotential and performed best during the galvanostatic AST. A second reason to not consider the time required to reach the cutoff voltage as a criterion of stability has been evoked by Geiger et al 39 These authors related the abrupt and rapid increase in potential to the passivation of the backing electrode and the associated increase in contact resistance with the catalyst.…”

Section: Determination Of S-numbermentioning

confidence: 99%

“…non-annealed supported IrOx nanocatalysts) or those which were intrinsically very active towards the OER (e.g. anodically formed Ir oxide on thin-films or single crystals 15,38 ) electrocatalysed the OER at lower overpotential, and best performed during the galvanostatic AST. A second reason to not consider the time required to reach the cut-off voltage as a criterion of stability has been evoked by Geiger et al 39 .…”

Section: Determination Of S-number Values For Supported and Unsupported Irox Catalystsmentioning

confidence: 99%

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Oxygen Evolution Reaction Activity and Stability Benchmarks for Supported and Unsupported IrO_x Electrocatalysts

et al. 2021

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Advanced materials are needed to meet the requirements of devices designed for harvesting and storing renewable electricity. In particular, polymer electrolyte membrane water electrolyzers (PEMWEs) could benefit from a reduction in the size of the iridium oxide (IrOx) particles used to electrocatalyze the sluggish oxygen evolution reaction (OER). To verify the validity of this approach, we built a library of 18 supported and unsupported IrOx catalysts and established their stability number (S-number) values using inductively-coupled plasma mass spectrometry and electrochemistry. Our results provide quantitative evidence that (i) supported IrOx nanocatalysts are more active towards the OER but less stable than unsupported micrometer-sized catalysts, e.g. commercial IrO2 or porous IrOx microparticles; (ii) tantalum-doped tin oxides (TaTO) used as supports for IrOx nanoparticles are more stable than antimony-doped tin oxides (ATO) and carbon black (Vulcan XC72); (iii) thermal annealing under air atmosphere yields depreciated OER activity but enhanced stability; (iv) the beneficial effect of thermal annealing holds both for microand nano-IrOx particles, and leads to one order of magnitude lower Ir atom dissolution rate with respect to non-annealed catalysts; (v) the best compromise between OER activity and stability was obtained for unsupported porous IrOx microparticles after thermal annealing under air at 450°C. These insights provide guidance on which material classes and strategies are the most likely to increase sustainably the OER efficiency while contributing to diminish the cost of PEMWE devices.

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Section: Determination Of S-numbermentioning

confidence: 99%

Section: Determination Of S-number Values For Supported and Unsupported Irox Catalystsmentioning

confidence: 99%

Oxygen Evolution Reaction Activity and Stability Benchmarks for Supported and Unsupported IrO_x Electrocatalysts

et al. 2021

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“…A slight Sn dissolution peak was noticed during the first positive going potential sweep. Itwas accompanied by a small, rapidly vanishing Ir dissolution peak (not synchronized with the Sn dissolution peak), which indicates that electrochemical conditioning leads to the formation of higher oxidation state Ir atoms which are more resistant towards electrochemical dissolution30,[40][41][57][58] . Similar results were obtained for IrO x /TaTO-2.5, and this is most obvious fromFigure 5dshowing the Ir mass lost (ng cm -2 ) per cycle for all the electrocatalysts investigated in this study.…”

mentioning

confidence: 99%

Manipulating the Corrosion Resistance of SnO₂ Aerogels through Doping for Efficient and Durable Oxygen Evolution Reaction Electrocatalysis in Acidic Media

et al. 2020

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Implementing iridium oxide (IrO x) nanocatalysts can be a major breakthrough for oxygen evolution reaction (OER), the limiting reaction in polymer electrolyte membrane water electrolyser devices. However, this strategy requires developing a support that is electronically conductive, is stable in OER conditions, and features a large specific surface area and a porosity adapted to gas-liquid flows. To address these challenges, we synthesized IrO x nanoparticles, supported them onto doped SnO 2 aerogels (IrO x /doped SnO 2), and assessed their electrocatalytic activity towards the OER and their resistance to corrosion in acidic media by means of a flow cell connected to an inductively-coupled mass spectrometer (FC-ICP-MS). The FC-ICP-MS results show that the long-term OER activity of IrO x /doped SnO 2 aerogels is controlled by the resistance to corrosion of the doping element, and by its concentration in the host SnO 2 matrix. In particular, we provide quantitative evidence that Sb-doped SnO 2 type supports continuously dissolve while Tadoped or Nb-doped SnO 2 supports with appropriate doping concentrations are stable under acidic OER conditions. These results shed fundamental light on the complex

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“…Heterogeneous electrocatalysts have received ever-increasing attention owing to global issues such as climate change and energy supply. Since platinum group metals such as Pt, Pd, Ir, Rh, and Ru are particularly active in electrocatalysis, their development as catalysts has been fundamentally established by single crystals ( 1 – 6 ) and practically proceeded with alloying ( 7 , 8 ), surface defect engineering ( 9 , 10 ), and nanocrystal synthesis ( 7 , 11 ). Specifically, single-atom catalysts (SACs) have been prepared by coordinating single metal atoms with carbon-based supports or by embedding them into the defects in metal oxides/metal-organic frameworks (MOFs) to prevent the clustering ( 12 , 13 ).…”

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confidence: 99%

Achieving complete electrooxidation of ethanol by single atomic Rh decoration of Pt nanocubes

Chang

Hong

Lee

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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Significance Direct ethanol fuel cells are attracting growing attention as portable power sources due to their advantages such as higher mass-energy density than hydrogen and less toxicity than methanol. However, it is challenging to achieve the complete electrooxidation to generate 12 electrons per ethanol, resulting in a low fuel utilization efficiency. This manuscript reports the complete ethanol electrooxidation by engineering efficient catalysts via single-atom modification. The combined electrochemical measurements, in situ characterization, and density functional theory calculations unravel synergistic effects of single Rh atoms and Pt nanocubes and identify reaction pathways leading to the selective C–C bond cleavage to oxidize ethanol to CO 2 . This study provides a unique single-atom approach to tune the activity and selectivity toward complicated electrocatalytic reactions.

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Investigating the oxygen evolution reaction on Ir(111) electrode in acidic medium using conventional and dynamic electrochemical impedance spectroscopy

Cited by 12 publications

References 66 publications

Oxygen Evolution Reaction Activity and Stability Benchmarks for Supported and Unsupported IrO_x Electrocatalysts

Oxygen Evolution Reaction Activity and Stability Benchmarks for Supported and Unsupported IrO_x Electrocatalysts

Manipulating the Corrosion Resistance of SnO₂ Aerogels through Doping for Efficient and Durable Oxygen Evolution Reaction Electrocatalysis in Acidic Media

Achieving complete electrooxidation of ethanol by single atomic Rh decoration of Pt nanocubes

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Investigating the oxygen evolution reaction on Ir(111) electrode in acidic medium using conventional and dynamic electrochemical impedance spectroscopy

Cited by 12 publications

References 66 publications

Oxygen Evolution Reaction Activity and Stability Benchmarks for Supported and Unsupported IrOx Electrocatalysts

Oxygen Evolution Reaction Activity and Stability Benchmarks for Supported and Unsupported IrOx Electrocatalysts

Manipulating the Corrosion Resistance of SnO2 Aerogels through Doping for Efficient and Durable Oxygen Evolution Reaction Electrocatalysis in Acidic Media

Achieving complete electrooxidation of ethanol by single atomic Rh decoration of Pt nanocubes

Contact Info

Product

Resources

About

Oxygen Evolution Reaction Activity and Stability Benchmarks for Supported and Unsupported IrO_x Electrocatalysts

Oxygen Evolution Reaction Activity and Stability Benchmarks for Supported and Unsupported IrO_x Electrocatalysts

Manipulating the Corrosion Resistance of SnO₂ Aerogels through Doping for Efficient and Durable Oxygen Evolution Reaction Electrocatalysis in Acidic Media