Phase Engineering Modulates the Electronic Structure of the IrO2/MoS2 Heterojunction for Efficient and Stable Water Splitting DOI
Shougang Sun,

Ziqi Wan,

Yingying Xu

et al.

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

The engineering of dual-functional catalytic systems capable driving complete water dissociation in acidic environments represents a critical requirement for advancing proton exchange membrane electrolyzer technology, yet significant challenges remain. In this work, we investigate an IrO2/MoS2/CNT heterostructure catalyst demonstrating enhanced bifunctional performance both the oxygen evolution reaction (OER) and hydrogen (HER) under conditions. Strategic incorporation IrO2 into MoS2/CNT heterojunction induces partial phase transformation from 2H to metastable 1T configuration MoS2, thereby modulating electronic structure improving overall splitting. optimized exhibited exceptional overpotentials 9 mV 182 at current density 10 mA cm–2 media. Full-cell evaluations further confirmed its practical potential, showing 1.47 V operation voltage that outperforms standard Pt/C||IrO2 counterparts by 120 mV. experimental results revealed n–n between IrO2/CNT generates built-in electric field, enhancing charge redistribution electron transport. Moreover, functional theory simulations identify iridium centers as dominant loci, with 1T-MoS2 mediating equilibration atomic interfaces. This modification facilitates *OH adsorption *OOH deprotonation lowers kinetic barrier during water-splitting process.

Language: Английский

Water‐Hydroxide Trapping in Hollandite‐Type Iridium Oxide Enables Efficient Proton Exchange Membrane Water Electrolysis DOI Open Access

Zhaoyan Luo,

Yinnan Qian,

Zijie Yang

et al.

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

Published: March 5, 2025

Abstract The development of highly active iridium oxides with excellent stability in acidic environments and significantly reduced Ir content is crucial for advancing competitive proton exchange membrane water electrolyzer (PEMWE) technologies. In this study, an intrinsically acid‐stable low‐iridium (Ir/IrO x (OH) y ·(H 2 O) n ) OER electrocatalyst via alkali‐assisted ethylene glycol reduction method designed. Ir/IrO shows a hollandite‐like structure abundant edge‐sharing IrO 6 octahedra that accommodates structural OH ligands its tunnels. situ/operando spectroscopies demonstrate lattice (or ligands)–mediated oxygen bypasses key rate‐limiting steps the process, including oxygen–oxygen bond formation adsorbate evolution mechanism (AEM) deprotonation (LOM), which typically hinder efficiency. Moreover, interfacial are shown to accelerate intermediates, thereby enhancing kinetics hydrogen reaction (HER). resulting catalyst achieves lower overpotential 1.79 V exhibits high durability, sustaining 1200 h at 1 A cm −2 under industrial conditions. These findings highlight potential high‐performance, durable PEMWE systems.

Language: Английский

Citations

0
Desert Beetle Inspired Heterogeneous Electrode for Large Current Density Hydrogen Evolution Reaction DOI Open Access

Yingjia Sun,

Chunhui Zhang, Ziwei Guo

et al.

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

Published: March 18, 2025

Abstract The hydrogen (H 2 ) evolution reaction (HER) is a pivotal process in the production of green H , which will play crucial role future sustainable energy systems. Despite extensive efforts to optimize catalyst activity, great challenges related mass transfer at electrode interface still impede improvement HER efficiency. Here, catalytic system inspired designed by desert‐beetle's hydrophilic/hydrophobic patterned back, natural structure capable condensing and transporting fog droplets. This composed superaerophobic (SAB) electrocatalytic dots surrounded with superaerophilic (SAL) coating, can efficiently enhance gaseous dissolved achieve exceptional performance. Such desert beetle‐inspired using platinum (Pt) as achieves an excellent current density (−1252 mA cm −2 −0.5 V versus RHE, times higher than conventional Pt (−408.5 ). overpotential required −10 only −7 mV, compared −25 mV on electrode. also applicable various catalysts (e.g., Re‐Co, Co‐Cu, Co‐Mo, Cu‐Mo, Ni‐Mo), exhibit minimum 200% increase, their structures.

Language: Английский

Citations

0
Regulating the H adsorption on supported RuO2 toward efficient Hydrogen evolution catalysis DOI

Fangfang Wan,

Donghao Ye,

Yajin Ye

et al.

Applied Catalysis A General, Journal Year: 2025, Volume and Issue: unknown, P. 120226 - 120226

Published: March 1, 2025

Language: Английский

Citations

0
High‐Performance FeRu Alloy Electrocatalyst Integrated with a Mo Substrate for Hydrogen Evolution Reaction in Seawater DOI Open Access

Mengtian Huo,

Xinran Sun,

Jianhang Sun

et al.

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

Published: March 19, 2025

Abstract The production of hydrogen from seawater offers a potential pathway to accomplish sustainable energy solutions. However, this process is impeded by the sluggish kinetics evolution reaction (HER) and corrosive nature seawater. In work, an FeRu alloy electrocatalyst integrated with Mo substrate (FeRu/MoO 2 @Mo) developed, specifically designed for HER in both alkaline environments. FeRu/MoO @Mo catalyst demonstrated remarkable performance, achieving overpotentials only 22, 42, 65 mV solution, simulated seawater, real at 10 mA cm −2 . Moreover, exhibited long‐term stability HER, maintaining its activity least 400 h under conditions 1 m KOH. situ Raman spectroscopy theoretical calculations revealed incorporation Fe reduces density states near Fermi level Ru, thereby optimizing adsorption–desorption behavior enhancing activity. This work scalable cost‐effective strategy development efficient non‐platinum catalysts.

Language: Английский

Citations

0
Phase Engineering Modulates the Electronic Structure of the IrO2/MoS2 Heterojunction for Efficient and Stable Water Splitting DOI
Shougang Sun,

Ziqi Wan,

Yingying Xu

et al.

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

The engineering of dual-functional catalytic systems capable driving complete water dissociation in acidic environments represents a critical requirement for advancing proton exchange membrane electrolyzer technology, yet significant challenges remain. In this work, we investigate an IrO2/MoS2/CNT heterostructure catalyst demonstrating enhanced bifunctional performance both the oxygen evolution reaction (OER) and hydrogen (HER) under conditions. Strategic incorporation IrO2 into MoS2/CNT heterojunction induces partial phase transformation from 2H to metastable 1T configuration MoS2, thereby modulating electronic structure improving overall splitting. optimized exhibited exceptional overpotentials 9 mV 182 at current density 10 mA cm–2 media. Full-cell evaluations further confirmed its practical potential, showing 1.47 V operation voltage that outperforms standard Pt/C||IrO2 counterparts by 120 mV. experimental results revealed n–n between IrO2/CNT generates built-in electric field, enhancing charge redistribution electron transport. Moreover, functional theory simulations identify iridium centers as dominant loci, with 1T-MoS2 mediating equilibration atomic interfaces. This modification facilitates *OH adsorption *OOH deprotonation lowers kinetic barrier during water-splitting process.

Language: Английский

Citations

0