Control of Ir oxidation states to overcome the trade-off between activity and stability for the oxygen evolution reaction

Lee, Seung Woo; Baik, Chaekyung; Kim, Do-Hyung; Pak, Chanho

doi:10.1016/j.jpowsour.2021.229689

Cited by 40 publications

(16 citation statements)

References 66 publications

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“…The cell voltage was found to be as low as 1.56 V at 80 °C to provide 1.0 A•cm −2 , and the mass activity based on noble metal (1.242 A•mg −1 for IrRu/T 90 G 10 ) at 1.6 V was much higher than that of commercial IrO 2 . Ir/Nb 2 O 5−x was constructed by depositing metal Ir nanoparticles on Nb 2 O 5−x , where the Ir atoms were placed tightly on the [001] crystal plane of Nb 2 O 5−x to create a thick Ir shell with approximately 1 nm in thickness [231]. The MEA with an anode catalyst of Ir/Nb 2 O 5−x , a cathode catalyst of commercial Pt/C, and a membrane of Nafion 115 was evaluated at 80 °C.…”

Section: Ir-based Single-atom Catalysts (Sacs)mentioning

confidence: 99%

Iridium-based catalysts for oxygen evolution reaction in acidic media: Mechanism, catalytic promotion effects and recent progress

Wang¹,

Schechter²,

Feng³

2023

Nano Research Energy

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Iridium (Ir)-based catalysts are highly efficient for the anodic oxygen evolution reaction (OER) due to high stability and anticorrosion ability in the strong acid electrolyte. Recently, intensive attention has been directed to novel, efficient, and lowcost Ir-based catalysts to overcome the challenges of their application in the water electrolysis technique. To make a comprehensive understanding of the recently developed Ir-based catalysts and their catalytic properties, the mechanism and catalytic promotion principles of Ir-based catalysts were discussed for OER in the acid condition aimed for the proton exchange membrane water electrolyzer (PEMWE) in this review. The OER catalytic mechanisms of the adsorbate evolution mechanism and the lattice oxygen mechanism were first presented and discussed for easy understanding of the catalytic mechanism; a brief perspective analysis of promotion principles from the aspects of geometric effect, electronic effect, synergistic effect, defect engineering, support effect was concluded. Then, the latest progress and the practical application of Ir-based catalysts were introduced in detail, which was classified into the varied composition of Ir catalyst in terms of alloys, hetero-element doping, perovskite, pyrochlore, heterostructure, core-shell structure, and supported catalysts. Finally, the problems and challenges faced by the current Ir-based catalyst in the acidic electrolyte were put forward. It is concluded that highly efficient catalysts with low Ir loading should be developed in the future, and attention should be paid to probing the structural and performance correlation, and their application in real PEMWE devices. Hopefully, the current effort can be helpful in the catalysis mechanism understanding of Ir-based catalysts for OER, and instructive to the novel efficient catalysts design and fabrication.

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Section: Ir-based Single-atom Catalysts (Sacs)mentioning

confidence: 99%

Iridium-based catalysts for oxygen evolution reaction in acidic media: Mechanism, catalytic promotion effects and recent progress

Wang¹,

Schechter²,

Feng³

2023

Nano Research Energy

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“…Studies have shown that the dissolution can be alleviated by thermal annealing, despite the sacrifice of activity. [ 334 ] It is emphasized that electronic structure regulations and mechanism modulations help regulation of oxidation states [ 335 ] to avoid severe dissolution, which have been mentioned above. Moreover, the optimization of CL layer structure plays an important role in promoting mass transfer and maintaining stability.…”

Section: Application In Pemwementioning

confidence: 99%

Advances in Oxygen Evolution Electrocatalysts for Proton Exchange Membrane Water Electrolyzers

Chen

Guo

Pan

et al. 2022

Advanced Energy Materials

164

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“…In particular, the Ir(III) catalyst on the shell of the catalyst was shown to provide higher catalytic activity while the Ir(IV) core prevented dissolution of the catalyst. Similarly, Lee et al developed iridium-based catalysts with a gradient oxidation state with the O/Ir ratio, decreasing from the shell to the core of the catalyst . Following accelerated stress tests, the catalyst with gradient Ir oxidation states was shown to have improved performance and low dissolution rates, when compared to state-of-the-art iridium oxide, satisfying the balance between activity and stability.…”

Section: Challenges With Balancing Activity and Stability Of Oxygen E...mentioning

confidence: 99%

The Role of Electrocatalysts in the Development of Gigawatt-Scale PEM Electrolyzers

Ouimet¹,

Glenn²,

Porcellinis³

et al. 2022

ACS Catal.

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Electrocatalysts are nanomaterials of paramount importance within water electrolyzers, because they facilitate the electron transfer between reactants and electrode, enabling the chemical transformation of water into hydrogen and oxygen. In this Perspective, recent findings in electrocatalyst development for the next generation of polymer electrolyte membrane (PEM) water electrolyzers at scale are discussed. We discuss opportunities to create catalyst architectures, the importance to demonstrate electrode manufacturing tools, and how useful advanced characterization methods shall, in the short term, allow large-scale deployment of water splitting devices with higher efficiency, acceptable durability, and low cost. We envision next-generation PEM cells permitting a transformational change in the chemical industry by the manufacturing of low-cost hydrogen.

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Control of Ir oxidation states to overcome the trade-off between activity and stability for the oxygen evolution reaction

Cited by 40 publications

References 66 publications

Iridium-based catalysts for oxygen evolution reaction in acidic media: Mechanism, catalytic promotion effects and recent progress

Iridium-based catalysts for oxygen evolution reaction in acidic media: Mechanism, catalytic promotion effects and recent progress

Advances in Oxygen Evolution Electrocatalysts for Proton Exchange Membrane Water Electrolyzers

The Role of Electrocatalysts in the Development of Gigawatt-Scale PEM Electrolyzers

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