Science China Chemistry, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 5, 2024
Язык: Английский
Advanced Materials, Год журнала: 2025, Номер unknown
Опубликована: Янв. 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.
Язык: Английский
Процитировано
3
Advanced Materials, Год журнала: 2025, Номер unknown
Опубликована: Март 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.
Язык: Английский
Процитировано
2
ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown
Опубликована: Март 26, 2025
Proton exchange membrane (PEM) water electrolyzers are one type of the most promising technologies for efficient, nonpolluting and sustainable production high-purity hydrogen. The anode catalysts account a very large fraction cost in PEM electrolyzer also determine lifetime electrolyzer. To date, Ir- Ru-based materials types acidic oxygen evolution reaction (OER), but they still face challenges high or low stability. Hence, exploring Ir stable electrocatalysts OER attracts extensive research interest recent years. Owing to these great efforts, significant developments have been achieved this field. In review, field comprehensively described. possible mechanisms first presented, followed by introduction criteria evaluation electrocatalysts. development then elucidated according strategies utilized tune catalytic performances. Lastly, future burgeoning is discussed.
Язык: Английский
Процитировано
1
Small, Год журнала: 2024, Номер unknown
Опубликована: Дек. 23, 2024
Proton exchange membrane (PEM) electrolysis faces challenges associated with high overpotential and acidic environments, which pose significant hurdles in developing highly active durable electrocatalysts for the oxygen evolution reaction (OER). Ir-based nanomaterials are considered promising OER catalysts PEM due to their favorable intrinsic activity stability under conditions. However, cost limited availability limitations. Consequently, numerous studies have emerged aimed at reducing iridium content while maintaining durability. Furthermore, research on mechanism of has garnered widespread attention differing views among researchers. The recent progress balancing activity, durability, low is summarized this review, a particular focus effects catalyst morphology, heteroatom doping, substrate introduction, novel structure development performance from four perspectives. Additionally, mechanistic discussed, both theoretical experimental approaches elucidate mechanism. Finally, perspectives future developments presented.
Язык: Английский
Процитировано
5
Advanced Energy Materials, Год журнала: 2025, Номер unknown
Опубликована: Фев. 10, 2025
Abstract Exploring low‐iridium (Ir) electrocatalysts for oxygen evolution reaction (OER) is exigent to promote the commercialization of proton electrolyte membrane water electrolyzers (PEMWEs). Herein, study presents a scalable and facile strategy in situ construct an IrO x nanofilm continuously coated on TiO support as efficient durable OER catalyst through one‐step annealing Ir‐salt‐adsorbed titanium‐based metal–organic frameworks (MOFs) precursor. The unique structure forms continuous p‐n junction interface, endowing strong interfacial electron transfer from also ensuring well‐connected conductive network anodic catalytic layer due dispersion . optimal requires low overpotential 233 mV at 10 mA cm −2 with 40‐fold com. 2 mass activity. assembled PEMWE shows cell voltage 1.762 V 1 A ≈220 h operation under start/shut‐down operation. Operando characterizations theoretical calculation reveal that not only reduces energy barrier dissociation deprotonation step *OOH boosting kinetics but prevents oxidation Ir sites form soluble species improves durability. This work offers new avenue rationally design synthesize low‐Ir application.
Язык: Английский
Процитировано
0
Inorganic Chemistry, Год журнала: 2025, Номер unknown
Опубликована: Фев. 25, 2025
Pursuing highly active and stable Ru-based catalysts for the oxygen evolution reaction (OER) under acidic conditions is important in advancing proton exchange membrane (PEM) water electrolyzers. Unfortunately, inadequate stability, especially a large current density of catalysts, still hinders its practical application. Herein, we report La doping strategy that simultaneously enhances both OER activity stability RuO2 media. The introduction into induces tensile strain, which effectively weakens covalency Ru–O bonds. This structural modification significantly inhibits Ru dissolution, thereby substantially enhancing RuO2. Meanwhile, modulates electronic structure optimizes adsorption energy intermediates, electrocatalytic activity. Notably, optimized La0.05-RuO2 electrocatalyst presents an excellent performance 0.5 M H2SO4 electrolyte, delivers low overpotential 190 mV at 10 mA cm–2 sustains 150 h without obvious decay 50 cm–2. More importantly, PEM electrolyzer constructed by using our as anode catalyst, acquires 200 1 A cm–2, highlighting strong potential industrial applications. work sheds new light on designing high-performance toward
Язык: Английский
Процитировано
0
Advanced Functional Materials, Год журнала: 2025, Номер unknown
Опубликована: Март 10, 2025
Abstract The design and fabrication of non‐precious metal materials for bifunctional oxygen electrocatalytic properties with reversible reduction reaction (ORR) evolution (OER) has been a research hotspot in the field zinc–air batteries. Herein, hierarchical carbon nanofiber immobilized iron cobalt oxide particles (FeCoO x ) Fe‐N sites catalyst is synthesized through electrostatic spinning situ polymerization pyrrole coupled pyrolysis. FeCoO /Fe─N─C demonstrates superior performance (E 1/2 = 0.91 V, η 10 350 mV). Liquid batteries employing exhibit high power 184.8 mW cm −2 more than 580 cycles stable cycling ability. Additionally, incorporation cobaltite introduces extra electrons optimizes adsorption capacity intermediates, effectively boosting inherent ORR activity. experimental results illustrate that special geometrical structure spinel ferrite provides excellent OER catalytic performance. Theoretical calculations indicate shifts d‐band center closer to Fermi level f ), thereby modulating hybridization between Fe 3d O 2p orbitals. This work offers an effective approach constructing coupling catalysts have single atoms coexisting efficient catalysis.
Язык: Английский
Процитировано
0
Next Energy, Год журнала: 2025, Номер 8, С. 100260 - 100260
Опубликована: Март 12, 2025
Процитировано
0
Advanced Materials, Год журнала: 2025, Номер unknown
Опубликована: Март 23, 2025
Abstract Developing efficient and stable catalysts that facilitate the oxygen‐evolution reaction (OER) through an oxide‐path mechanism (OPM) is of considerable interest. However, it remains a significant challenge due to stringent structural requirements these catalysts. This work reports using strategy integrates Ir/Mn co‐mixing strong oxide‐support interaction (SOSI) modulation, Ir‐based follow OPM for acidic OER can be developed. The mainly relies on optimizing distance oxygeneous intermediate adsorption sites by modulating SOSI plasma defect engineering trigger pathway with lower energy barrier. density‐functional‐theory (DFT) calculations reveal electronic coupling between Ir Mn via Ir─O─Mn bond ready adsorbed site those site, leading asymmetric oxygen OER. developed catalyst merely requires overpotential 240 mV drive 10 mA cm −2 mass‐activity > 75 times higher than IrO 2 . When used in proton‐exchange‐membrane water‐electrolyzers, shows high performance excellent stability at industrial‐level current density 1.0 A
Язык: Английский
Процитировано
0
ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown
Опубликована: Апрель 1, 2025
Proton-exchange membrane water electrolysis (PEMWE) holds great promise for hydrogen production applications. However, the reliance of PEMWE electrodes on high loadings expensive iridium poses a significant barrier to their commercial viability. Therefore, development high-performance oxygen evolution catalysts with low content is critical importance. In this research, porous antimony tin oxide (ATO) conductive support particle assembly aggregate structure was fabricated by carbon template removal method. ATO-supported IrO2 exhibits significantly improved reaction (OER) activity, much lower overpotential compared unsupported catalyst. Moreover, it achieves 1.8 V at 2 A cm-2 an ultralow loading (0.3 mgIr cm-2) proton-exchange electrolyzer. Characterization techniques and density functional theory calculations have elucidated that enhanced performance attributed morphology ATO strong metal oxide-support interaction between support. These findings validate practicality nanostructured antimony-tin-oxide-supported applications offer pathway design low-Ir OER catalysts.
Язык: Английский
Процитировано
0