A highly active and stable 3D dandelion spore-structured self-supporting Ir-based electrocatalyst for proton exchange membrane water electrolysis fabricated using structural reconstruction

Yeo, Kyeong-Rim; Lee, Kug‐Seung; Kim, Hoyoung; Lee, Jinwoo; Kim, Soo‐Kil

doi:10.1039/d2ee01042a

Cited by 60 publications

(28 citation statements)

References 64 publications

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“…10(a)) [145,227]. The current density in PEMWE is expected to be higher than 1 A•cm -2 , with the operating temperature around 60 to 80 °C, and the energy efficiency is expected to be between 75% and 80% [228,229]. Actually, though many catalysts have been demonstrated to have good catalytic performance in acidic OER, they might not be available in the practical PEMWE application [36].…”

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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“…As a prominent half-reaction, the electrocatalytic oxygen evolution reaction (OER) has attracted great attention in the diverse energy-related realm, such as producing clean hydrogen from overall water splitting, fuel cells, renewable metal-air batteries, and CO 2 reduction. − Unfortunately, in practical applications, the actual potential to drive OER is as high as 1.8 V, even to 2.0 V, much higher than 1.23 V, the theoretical thermodynamics potential. , This high input potential inevitably causes extra energy consumption. Therefore, replacing OER with more easily oxidizable species is an effective and environmentally friendly way. , Among them, the urea oxidation reaction (UOR), which has a lower theoretical voltage of only 0.37 V cuts a striking figure. − Moreover, UOR holds great significance for the treatment of urea-rich industrial wastewater and domestic sewage. , Thus, UOR is an ideal alternative to the conventional OER.…”

Section: Introductionmentioning

confidence: 99%

Boosting Urea Electrooxidation Activity of Ni₅P₄ by Vanadium Doping for Urea-Assisted Renewable Energy Conversion Devices

Cao

Sun

et al. 2023

ACS Sustainable Chem. Eng.

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The urea oxidation reaction (UOR), a competitive substitute for the oxygen evolution reaction (OER), holds superior potential to meet the upsurge of renewable energy conversion due to low theoretical potential while the sluggish UOR kinetics impede its practical application. In this report, for the first time, we demonstrate that the UOR activity of Ni5P4 is improved via V incorporation. The novel amorphous V-doped Ni5P4 (V10%-Ni5P4) microflower structure with optimized electronic structure was prepared by a solvothermal–phosphorization process. With V atoms involved, the V10%-Ni5P4 microflowers are assembled by much thinner, denser nanosheet units compared with the Ni5P4 counterpart, which endows it with more active sites, enhanced mass transfer, conductivity, and better wettability. The V10%-Ni5P4 microflowers exhibit outstanding UOR activity of 282 mA cm–2 at 1.6 V vs RHE with a low Tafel slope (36.1 mV dec–1). Furthermore, the urea-assisted electrolytic cell only needs 1.44 V to provide 50 mA cm–2 and the urea-assisted rechargeable Zn-Air battery (uZAB) is illustrated to have a higher open-circuit voltage of 1.43 V and possesses a lower potential gap than that Pt/Ir-based uZABs. This report sheds light on the role of vanadium in crystallization and structure optimization and lays the foundation for developing new UOR electrocatalysts.

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“…11–13 Currently, Ir-based catalysts are the only available acidic OER electrocatalysts with both reasonable activity and stability for commercial PEMWE electrolyzers. 14–16 However, large-scale deployment of PEMWE electrolyzers is restricted by the low earth abundance and high cost of iridium. 13,17 Therefore, the development of more active and robust electrocatalysts remains a pivotal task for acidic OER and HER.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous PdIr alloy for high-efficiency and durable water splitting in acidic media

et al. 2023

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A highly active and stable 3D dandelion spore-structured self-supporting Ir-based electrocatalyst for proton exchange membrane water electrolysis fabricated using structural reconstruction

Abstract: A highly active and stable 3D dandelion spore-structured self-supporting Ir-based electrocatalyst for proton exchange membrane water electrolysis fabricated using structural reconstruction.

Cited by 60 publications

References 64 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

Boosting Urea Electrooxidation Activity of Ni₅P₄ by Vanadium Doping for Urea-Assisted Renewable Energy Conversion Devices

Nanoporous PdIr alloy for high-efficiency and durable water splitting in acidic media

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A highly active and stable 3D dandelion spore-structured self-supporting Ir-based electrocatalyst for proton exchange membrane water electrolysis fabricated using structural reconstruction

Abstract: A highly active and stable 3D dandelion spore-structured self-supporting Ir-based electrocatalyst for proton exchange membrane water electrolysis fabricated using structural reconstruction.

Cited by 60 publications

References 64 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

Boosting Urea Electrooxidation Activity of Ni5P4 by Vanadium Doping for Urea-Assisted Renewable Energy Conversion Devices

Nanoporous PdIr alloy for high-efficiency and durable water splitting in acidic media

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Product

Resources

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Boosting Urea Electrooxidation Activity of Ni₅P₄ by Vanadium Doping for Urea-Assisted Renewable Energy Conversion Devices