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

Phosphorus–tungsten dual-doping boosts acidic overall seawater splitting performance over RuOx nanocrystals DOI

Junyang Ding,

Zimo Peng,

Zhiwei Wang

et al.

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(41), P. 28023 - 28031

Published: Jan. 1, 2024

Dual-doped ruthenium-based nanocrystals were developed as efficient and stable electrocatalysts for acidic overall seawater splitting with superior activity durability.

Language: Английский

Citations

35
Self‐Encapsulation of High‐Entropy Alloy Nanoparticles inside Carbonized Wood for Highly Durable Electrocatalysis DOI

Y Wang,

Yang Zhang,

Pengyu Xing

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(28)

Published: April 26, 2024

High-entropy alloy nanoparticles (HEAs) show great potential in emerging electrocatalysis due to their combination and optimization of multiple elements. However, synthesized HEAs often exhibit a weak interface with the conductive substrate, hindering applications long-term catalysis energy conversion. Herein, highly active durable electrocatalyst composed quinary (PtNiCoFeCu) encapsulated inside activated carbonized wood (ACW) is reported. The self-encapsulation achieved during Joule heating synthesis (2060 K, 2 s) where naturally nucleate at defect sites. In meantime, catalyze deposition mobile carbon atoms form protective few-layer shell rapid quenching process, thus remarkably strengthening stability between ACW. As result, HEAs@ACW shows not only favorable activity an overpotential 7 mV 10 mA cm

Language: Английский

Citations

28
Europium Oxide Evoked Multisite Synergism to Facilitate Water Dissociation for Alkaline Hydrogen Evolution DOI
Yu Zhu,

Xiangrui Wu,

Zixin Wu

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: July 2, 2024

Abstract Exploring an efficient nonnoble metal catalyst for hydrogen evolution reaction (HER) is critical industrial alkaline water electrolysis. However, it remains a great challenge due to the additional energy required H─OH bond cleavage and lack of enough H 2 O adsorption sites most catalysts. Herein, integration oxophilic Eu 3 with NiCo alloy evoked multisite synergism facilitate dissociation HER proposed. The optimized ‐NiCo exhibits excellent activity low overpotential only 60 mV at 10 mA cm −2 good electrochemical stability, which superior that ‐free comparable benchmark Pt/C. key roles on enhanced performance are identified by in situ Raman spectroscopy theoretical calculations. It discovered strong oxophilicity facilitates breakage bonding while evoking electron redistribution /NiCo interface accelerating Volmer step HER. Furthermore, obtained as both anode cathode displays overall water‐splitting stability 1.0 M KOH solution. believed this study provides important inspiration design high‐performance electrocatalysts toward based rare‐earth materials.

Language: Английский

Citations

24
Strain-Triggered Distinct Oxygen Evolution Reaction Pathway in Two-Dimensional Metastable Phase IrO2 via CeO2 Loading DOI
Hao Yu, Yujin Ji, Chenchen Li

et al.

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(29), P. 20251 - 20262

Published: July 12, 2024

A strain engineering strategy is crucial for designing a high-performance catalyst. However, how to control the in metastable phase two-dimensional (2D) materials technically challenging due their nanoscale sizes. Here, we report that cerium dioxide (CeO

Language: Английский

Citations

20
Hydrothermal synthesis and characterization of FeSbO2F2 nanoparticle and its applications towards hydrogen evolution reaction, dye management and bacterial disinfection studies DOI
Sayantani Paul,

Sangita Das,

Debojyoti Kundu

et al.

Inorganic Chemistry Communications, Journal Year: 2025, Volume and Issue: unknown, P. 114073 - 114073

Published: Feb. 1, 2025

Language: Английский

Citations

2
Boron‐Induced Interstitial Effects Drive Water Oxidation on Ordered Ir‐B Compounds DOI
Ding Chen, Ruohan Yu, Hongyu Zhao

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(35)

Published: May 21, 2024

Abstract Interstitial filling of light atoms strongly affects the electronic structure and adsorption properties parent catalyst due to ligand ensemble effects. Different from conventional doping surface modification, constructing ordered intermetallic structures is more promising overcome dissolution reconstruction active sites through strong interactions generated by atomic periodic arrangement, achieving joint improvement in catalytic activity stability. However, for tightly arranged metal lattices, such as iridium (Ir), obtaining further unveiling their interstitial effects are still limited highly activated processes. Herein, we report a high‐temperature molten salt assisted strategy form Ir−B compounds (IrB 1.1 ) with boron (B) atoms. The B residing lattice Ir constitutes favorable surfaces donor‐acceptor architecture, which has an optimal free energy uphill rate‐determining step (RDS) oxygen evolution reaction (OER), resulting enhanced activity. Meanwhile, coupling structural units suppresses demetallation behavior Ir, ensuring Such B‐induced endow IrB higher OER performance than commercial IrO 2 , validated proton exchange membrane water electrolyzers (PEMWEs).

Language: Английский

Citations

10
Optimal Electrocatalyst Design Strategies for Acidic Oxygen Evolution DOI Creative Commons
Dongdong Zhang, Qilong Wu, Liyun Wu

et al.

Advanced Science, Journal Year: 2024, Volume and Issue: 11(38)

Published: Aug. 9, 2024

Abstract Hydrogen, a clean resource with high energy density, is one of the most promising alternatives to fossil. Proton exchange membrane water electrolyzers are beneficial for hydrogen production because their current facile operation, and gas purity. However, large‐scale application electrochemical splitting acidic electrolytes severely limited by sluggish kinetics anodic reaction inadequate development corrosion‐ highly oxidation‐resistant anode catalysts. Therefore, catalysts excellent performance long‐term durability must be developed oxygen evolution reactions (OER) in media. This review comprehensively outlines three commonly employed strategies, namely, defect, phase, structure engineering, address challenges within OER, while also identifying existing limitations. Accordingly, correlation between material design strategies catalytic discussed terms contribution activity stability. In addition, various nanostructures that can effectively enhance catalyst at mesoscale summarized from perspective engineering technology, thus providing suitable satisfy industrial requirements. Finally, future outlook area OER presented.

Language: Английский

Citations

9
Twin-distortion modulated ultra-low coordination PtRuNi-Ox catalyst for enhanced hydrogen production from chemical wastewater DOI Creative Commons
Yue Zhang,

Xueqin Mu,

Zhengyang Liu

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Nov. 22, 2024

The development of efficient and robust catalysts for hydrogen evolution reaction is crucial advancing the economy. In this study, we demonstrate that ultra-low coordinated hollow PtRuNi-Ox nanocages exhibit superior catalytic activity stability across varied conditions, notably surpassing commercial Pt/C catalysts. Notably, achieve current densities 10 mA cm−2 at only 19.6 ± 0.1, 20.9 21.0 0.1 mV in alkaline freshwater, chemical wastewater, seawater, respectively, while maintaining satisfied with minimal loss after 40,000 cycles. situ experiments theoretical calculations reveal coordination Pt, Ru, Ni atoms creates numerous dangling bonds, which lower water dissociation barrier optimizing adsorption. This research marks a notable advancement precise engineering atomically dispersed multi-metallic centers energy-related applications. Efficient are key to economy, particularly reaction. Here, authors report offer comparable performance both freshwater wastewater conditions.

Language: Английский

Citations

9
Rational Design of β-MnO2 via Ir/Ru Co-substitution for Enhanced Oxygen Evolution Reaction in Acidic Media DOI

Runxu Deng,

Feng Liu,

Shixin Gao

et al.

ACS Catalysis, Journal Year: 2025, Volume and Issue: 15(3), P. 1782 - 1794

Published: Jan. 17, 2025

The efficiency of the oxygen evolution reaction (OER) in acidic media is severely limited by poor stability, low activity, and high cost available catalysts. Enhancing intrinsic activity while maintaining stability reducing reliance on precious metals crucial. typical adsorbate mechanism (AEM) leads to overpotentials making transition alternative mechanisms, such as lattice (LOM) or oxide path (OPM), highly desirable due their lower overpotentials. Here, we combine density functional theory (DFT) calculations with experimental validation enhance β-MnO2 via co-substitution ruthenium (Ru) iridium (Ir), enabling from AEM OPM. DFT reveal that hindered weak nucleophilicity water, LOM suffers kinetic barriers structural distortions. In contrast, OPM demonstrates a significantly barrier, facilitated synergistic interaction between Ru Ir. Experimentally, IrRuMnOx was synthesized through co-precipitation hydrothermal methods, showing an 80-fold improvement mass 96-fold increase compared commercial IrO2, minimal noble metal leaching, confirmed inductively coupled plasma optical emission spectroscopy (ICP-OES). exhibited ultralow overpotential 475 mV at 1 A·cm–2 Tafel slope 44.26 mV·dec–1 0.5 M H2SO4, stable performance for over 100 h. Moreover, IrRuMnOx-based membrane electrode, Ir loading 0.075 mgIr·cm–2, achieved remarkable current densities 1.0 1.66 V 2.0 1.91 80 °C. This surpasses both unsupported conventional supported Ir-based catalysts comparable levels. study offers critical insights into OER mechanisms paves way developing efficient durable electrocatalysts hydrogen production.

Language: Английский

Citations

1
Proton Exchange Membrane Water Splitting: Advances in Electrode Structure and Mass‐Charge Transport Optimization DOI Creative Commons
Wenting Feng, Bin Chang, Yuanfu Ren

et al.

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

Published: March 4, 2025

Abstract Proton exchange membrane water electrolysis (PEMWE) represents a promising technology for renewable hydrogen production. However, the large‐scale commercialization of PEMWE faces challenges due to need acid oxygen evolution reaction (OER) catalysts with long‐term stability and corrosion‐resistant electrode assemblies (MEA). This review thoroughly examines deactivation mechanisms acidic OER crucial factors affecting assembly instability in complex environments, including catalyst degradation, dynamic behavior at MEA triple‐phase boundary, equipment failures. Targeted solutions are proposed, improvements, optimized designs, operational strategies. Finally, highlights perspectives on strict activity/stability evaluation standards, situ/operando characteristics, practical electrolyzer optimization. These insights emphasize interrelationship between catalysts, MEAs, activity, stability, offering new guidance accelerating systems.

Language: Английский

Citations

1