Metal‐Oxygen Octahedra Regulation of Iridium‐Based Perovskites for Efficient and Durable Acidic Water Oxidation DOI Open Access
Yang Yang, Yu‐Ting Chen, Yueying Yan

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 26, 2025

Abstract The dissolution and inactivation of anodic oxygen evolution reaction (OER) electrocatalysts remain significant barriers to the development acidic water electrolysis. Here, activity stability BaIrO 3 (BIO) perovskite are enhanced through controlled regulation metal‐oxygen octahedra via B‐site substitution with Co (BICO). During OER process, Ba leads formation highly active IrCoO x nanoparticles on amorphous surface layers BICO. introduction not only increases concentration high‐valence Ir species high but also prevents excessive oxidation by taking over its role during reaction. Theoretical calculations reveal a substantial reduction in energy barrier rate‐determining step (RDS) after doping. BICO‐2 electrocatalyst demonstrates exceptional performance, requiring an overpotential 216 mV achieve current density 10 mA cm −2 , while maintaining continuous operation for 140 h without degradation, boasting number (S‐number) 4.3 × 5 . Additionally, exhibits excellent durability proton exchange membranes (PEM) This work introduces novel approach designing fabricating efficient, long‐lasting electrocatalysts, offering insights advancing electrolysis technologies.

Language: Английский

Durable Acidic Oxygen Evolution Via Self-Construction of Iridium Oxide/Iridium-Tantalum Oxide Bi-Layer Nanostructure with Dynamic Replenishment of Active Sites DOI Creative Commons

Qi Guo,

Rui Li, Yanan Zhang

et al.

Nano-Micro Letters, Journal Year: 2025, Volume and Issue: 17(1)

Published: Feb. 25, 2025

Abstract Proton exchange membrane (PEM) water electrolysis presents considerable advantages in green hydrogen production. Nevertheless, oxygen evolution reaction (OER) catalysts PEM currently encounter several pressing challenges, including high noble metal loading, low mass activity, and inadequate durability, which impede their practical application commercialization. Here we report a self-constructed layered catalyst for acidic OER by directly using an Ir–Ta-based metallic glass as the matrix, featuring nanoporous IrO 2 surface formed situ on amorphous IrTaO x nanostructure during OER. This distinctive architecture significantly enhances accessibility utilization of Ir, achieving activity 1.06 A mg Ir −1 at 300 mV overpotential, 13.6 31.2 times greater than commercial Ir/C , respectively. The also exhibits superb stability under industrial-relevant current densities acid, indicating its potential uses. Our analyses reveal that coordinated nature surface-active species is effectively modulated through electronic interaction between Ta, preventing them from rapidly evolving into valence states suppressing lattice participation. Furthermore, underlying dynamically replenishes depletion sites inward crystallization selective dissolution, thereby ensuring catalyst’s long-term durability.

Language: Английский

Citations

1
Mastering the Use of Nanoprobes Beamlines for Electrochemistry: The Importance of Tracking Radiation Damage and Exploring Material Heterogeneity DOI Creative Commons
R. Vicente, Itamar T. Neckel, Pablo S. Fernández

et al.

ACS electrochemistry., Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

Language: Английский

Citations

0
Emergent Epitaxial Configuration of Pr3IrO7 Domains via YSZ (111) Substrate DOI Creative Commons
Gahee Noh, Lu Guo, Pratap Pal

et al.

Small Structures, Journal Year: 2025, Volume and Issue: unknown

Published: March 17, 2025

The 5 d rare Earth iridate is an intriguing material with exhibiting exotic electronic and magnetic phases due to spin‐orbit coupled states. Ternary iridium oxides Ln 3 IrO 7 contain unusual Ir 5+ (5 4 ) system, which remain a subject of active research. Fabricating epitaxial films challenging substrate compatibility, but it offers valuable platform explore behaviors under reduced dimensionality interactions, revealing novel phenomena based on ). In this regard, demonstrates that Pr its highly anisotropic orthorhombic structure can be epitaxially grown cubic (111)‐oriented yttrium‐stabilized ZrO 2 (YSZ) substrate. film exhibits six domains, where the (220) (202) planes aligning YSZ (111) threefold symmetry. This diverse domain configuration in leads unique properties, spin‐glass‐like behavior. thin for exploring unconventional states, their successful heteroepitaxy substrates opens new avenues discovering physical phenomena.

Language: Английский

Citations

0
Metal‐Oxygen Octahedra Regulation of Iridium‐Based Perovskites for Efficient and Durable Acidic Water Oxidation DOI Open Access
Yang Yang, Yu‐Ting Chen, Yueying Yan

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 26, 2025

Abstract The dissolution and inactivation of anodic oxygen evolution reaction (OER) electrocatalysts remain significant barriers to the development acidic water electrolysis. Here, activity stability BaIrO 3 (BIO) perovskite are enhanced through controlled regulation metal‐oxygen octahedra via B‐site substitution with Co (BICO). During OER process, Ba leads formation highly active IrCoO x nanoparticles on amorphous surface layers BICO. introduction not only increases concentration high‐valence Ir species high but also prevents excessive oxidation by taking over its role during reaction. Theoretical calculations reveal a substantial reduction in energy barrier rate‐determining step (RDS) after doping. BICO‐2 electrocatalyst demonstrates exceptional performance, requiring an overpotential 216 mV achieve current density 10 mA cm −2 , while maintaining continuous operation for 140 h without degradation, boasting number (S‐number) 4.3 × 5 . Additionally, exhibits excellent durability proton exchange membranes (PEM) This work introduces novel approach designing fabricating efficient, long‐lasting electrocatalysts, offering insights advancing electrolysis technologies.

Language: Английский

Citations

0