Hollow Multishelled High Entropy Oxide with Inert Aluminum Stabilizer for Boosted Electrochemical Lithium Storage DOI Open Access

Fengfeng Dong,

Qiaoling Kang,

Rui Wang

et al.

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

Published: March 16, 2025

Abstract High entropy oxides (HEOs) have gained increasing attention as lithium‐ion battery anodes, owing to their multi‐principal synergistic effect and structural stability. However, the conversion type HEOs also suffer from low intrinsic conductivity, volume expansion, slow kinetics traditional metal oxide. Herein, a (FeCoNiCrMn) 2 O 3 HEO with hollow multishelled structure Al‐doping (Al‐HEO‐HoMS) is successfully prepared by thermal diffusion‐assisted template method. The effectively accommodates changes mitigates strains, resulting in excellent electrochemical Most importantly, inserted Al dopant Al‐HEO‐HoMS serves pegging points, securely fastening other metallic elements Al─O bonds maintain stability of anodes during repeated lithiation/delithiation. Additionally, abundant oxygen vacancies optimized electronic brought doping been validated accelerate lithiation kinetics. Consequently, anode exhibits high reversible capacity 1540 mAh g −1 after 500 cycles at 1 A . combination inert regulation expected alleviate expansion problem, offering universal strategy for designing advanced batteries.

Language: Английский

Unlocking Efficiency: Minimizing Energy Loss in Electrocatalysts for Water Splitting DOI Creative Commons
Wenxian Li, Yang Liu,

Ashraful Azam

et al.

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

Published: June 25, 2024

Abstract Catalysts play a crucial role in water electrolysis by reducing the energy barriers for hydrogen and oxygen evolution reactions (HER OER). Research aims to enhance intrinsic activities of potential catalysts through material selection, microstructure design, various engineering techniques. However, consumption has often been overlooked due intricate interplay among catalyst microstructure, dimensionality, catalyst–electrolyte–gas dynamics, surface chemistry, electron transport within electrodes, transfer electrode components. Efficient development high‐current‐density applications is essential meet increasing demand green hydrogen. This involves transforming with high into electrodes capable sustaining current densities. review focuses on improvement strategies mass exchange, charge transfer, resistance decrease consumption. It bridge gap between laboratory‐developed, highly efficient industrial regarding structural catalyst‐electrode interplay, outlining roadmap hierarchically structured electrode‐based minimizing loss electrocatalysts splitting.

Language: Английский

Citations

34
Gas Evolution in Water Electrolysis DOI
Paul A. Kempler, Robert H. Coridan, Long Luo

et al.

Chemical Reviews, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 11, 2024

Gas bubbles generated by the hydrogen evolution reaction and oxygen during water electrolysis influence energy conversion efficiency of production. Here, we survey what is known about interaction gas electrode surfaces on practicable devices used for electrolysis. We outline physical processes occurring life cycle a bubble, summarize techniques to characterize phenomena in situ practical device environments, discuss ways that electrodes can be tailored facilitate removal at high current densities. Lastly, review efforts model behavior individual multiphase flows produced gas-evolving electrodes. conclude our with short summary outstanding questions could answered future electrochemical environments or improved simulations flows.

Language: Английский

Citations

34
Ultrastable supported oxygen evolution electrocatalyst formed by ripening-induced embedding DOI
Wenjuan Shi, Tonghao Shen, C. Xing

et al.

Science, Journal Year: 2025, Volume and Issue: 387(6735), P. 791 - 796

Published: Jan. 2, 2025

The future deployment of terawatt-scale proton exchange membrane water electrolyzer (PEMWE) technology necessitates development an efficient oxygen evolution catalyst with low cost and long lifetime. Currently, the stability most active iridium (Ir) catalysts is impaired by dissolution, redeposition, detachment, agglomeration Ir species. Here we present a ripening-induced embedding strategy that securely embeds in cerium oxide support. Cryogenic electron tomography all-atom kinetic Monte Carlo simulations reveal synchronizing growth rate support nucleation Ir, regulated sonication, pivotal for successful synthesis. A PEMWE using this achieves cell voltage 1.72 volts at current density 3 amperes per square centimeter loading just 0.3 milligrams degradation 1.33 microvolts hour, as demonstrated 6000-hour accelerated aging test.

Language: Английский

Citations

15
Dynamic Redox Induced Localized Charge Accumulation Accelerating Proton Exchange Membrane Electrolysis DOI Creative Commons
Bin Chang, Yuanfu Ren, Nan Mu

et al.

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

Published: Jan. 2, 2025

The sluggish anodic oxygen evolution reaction (OER) in proton exchange membrane (PEM) electrolysis necessitates applied bias to facilitate electron transfer as well bond cleavage and formation. Traditional electrocatalysis focuses on analyzing the effects of transfer, while role charge accumulation induced by overpotential has not been thoroughly investigated. To explore influence mechanism bias-driven accumulation, capacitive Mn is incorporated into IrO

Language: Английский

Citations

4
Supported IrO2 Nanocatalyst with Multilayered Structure for Proton Exchange Membrane Water Electrolysis DOI Open Access

Yuannan Wang,

Zicheng Zhao,

Xiao Liang

et al.

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

Published: Aug. 7, 2024

Abstract The design of a low‐iridium‐loading anode catalyst layer with high activity and durability is key challenge for proton exchange membrane water electrolyzer (PEMWE). Here, the synthesis novel supported IrO 2 nanocatalyst tri‐layered structure, dubbed @TaO x @TaB that composed ultrasmall nanoparticles anchored on amorphous TaO overlayer TaB nanorods reported. composite electrocatalyst shows great stability toward oxygen evolution reaction (OER) in acid, thanks to its dual‐interface structural feature. electronic interaction /TaO interface can regulate coverage surface hydroxyl groups, Ir 3+ / 4+ ratio, redox peak potential enhancing OER activity, while dense prevent further oxidation substrate stabilize catalytic layers improving during OER. be used fabricate an PEMWE iridium‐loading as low 0.26 mg cm −2 . delivers current densities at cell voltages (e.g., 3.9 A @2.0 V), gives excellent retention more than 1500 h 2.0 density.

Language: Английский

Citations

15
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
Honeycomb‐Structured IrOx Foam Platelets as the Building Block of Anode Catalyst Layer in PEM Water Electrolyzer DOI

Zhoubing Xie,

Hui Chen, Xiyang Wang

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 20, 2024

Abstract Achieving robust long‐term durability with high catalytic activity at low iridium loading remains one of great challenges for proton exchange membrane water electrolyzer (PEMWE). Herein, we report the low‐temperature synthesis oxide foam platelets comprising edge‐sharing IrO 6 octahedral honeycomb framework, and demonstrate structural advantages this material multilevel tuning anodic catalyst layer across atomic‐to‐microscopic scales PEMWE. The integration foam‐like texture platelet morphology into a single system assures generation exposure highly active stable sites oxygen evolution reaction (OER), while facilitating reduction both mass transport loss electronic resistance layer. As proof concept, electrode assembly in single‐cell PEMWE based on honeycomb‐structured x platelets, (~0.3 mg Ir /cm 2 ), is demonstrated to exhibit ampere‐level current densities remain more than 2000 hours.

Language: Английский

Citations

10
Recent achievements in noble metal-based oxide electrocatalysts for water splitting DOI
Feng Wang,

Linfeng Xiao,

Y.‐B. Jiang

et al.

Materials Horizons, Journal Year: 2025, Volume and Issue: 12(6), P. 1757 - 1795

Published: Jan. 1, 2025

Noble metal-based oxide electrocatalysts are essential for the development of H 2 production technology by water electrolysis, and this review summarises recent research progress noble metal oxides in field electrolysis.

Language: Английский

Citations

1
Phase‐Engineered Bi‐RuO2 Single‐Atom Alloy Oxide Boosting Oxygen Evolution Electrocatalysis in Proton Exchange Membrane Water Electrolyzer DOI Open Access
Zhichao Yang, Yutian Ding, Wen Chen

et al.

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

Published: Jan. 16, 2025

Abstract Engineering nanomaterials at single‐atomic sites can enable unprecedented catalytic properties for broad applications, yet it remains challenging to do so on RuO 2 ‐based electrocatalysts proton exchange membrane water electrolyzer (PEMWE). Herein, the rational design and construction of Bi‐RuO single‐atom alloy oxide (SAAO) are presented boost acidic oxygen evolution reaction (OER), via phase engineering a novel hexagonal close packed ( hcp ) RuBi alloy. This SAAO electrocatalyst exhibits low overpotential 192 mV superb stability over 650 h 10 mA cm −2 , enabling practical PEMWE that needs only 1.59 V reach 1.0 A under industrial conditions. Operando differential electrochemical mass spectroscopy analysis, coupled with density functional theory studies, confirmed adsorbate‐evolving mechanism incorporation Bi 1 improves activity by electronic optimization hindering surface Ru demetallation. work not introduces new strategy fabricate high‐performance atomic‐level, but also demonstrates their potential use in electrolyzers.

Language: Английский

Citations

1
Recent advances and modulation tactics in Ru- and Ir-based electrocatalysts for PEMWE anodes at large current densities DOI Creative Commons
Yu Wang, Haijing Yan, Honggang Fu

et al.

eScience, Journal Year: 2024, Volume and Issue: unknown, P. 100323 - 100323

Published: Oct. 1, 2024

Language: Английский

Citations

8