Опубликована: Янв. 1, 2024
Язык: Английский
Applied Catalysis B Environment and Energy, Год журнала: 2024, Номер 359, С. 124461 - 124461
Опубликована: Июль 31, 2024
Язык: Английский
Процитировано
28
Energy & Fuels, Год журнала: 2024, Номер 38(21), С. 20791 - 20806
Опубликована: Окт. 18, 2024
Creating cost-effective, chemically stable electrocatalysts to improve the hydrogen evolution reaction (HER) and oxygen (OER) remains a major challenge in electrocatalytic water splitting. We synthesized highly efficient NiFe-layered double hydroxide (LDH) electrocatalyst using solvent-free method. The formation of well-interconnected metal ions with nanospherical architectures created an extensive electrochemically active surface area enriched catalytically sites, demonstrating synergistic effects. Preserving suitable stoichiometric ratio, such as Ni6Fe4LDH, was crucial enhancing catalytic performance for both HER OER. optimal Ni6Fe4LDH ratio established overpotentials 167 mV (112 dec–1) 280 (116 OER, attaining 10 mA cm–2 current density 1 M KOH. Moreover, demonstrated impressive robustness, up 90 h minor decrease 4.1 4.6% Notably, bifunctional two-electrode arrangement Ni6Fe4LDH/NF||Ni6Fe4LDH/NF, effective electrolysis accomplished, preserving at bias 1.64 V over 140 h, slight loss 3.9% density.
Язык: Английский
Процитировано
9
Advanced Functional Materials, Год журнала: 2025, Номер unknown
Опубликована: Апрель 16, 2025
Abstract Elevating iron‐involved sites in NiFe (oxy)hydroxides significantly accelerates oxygen evolution reaction (OER) kinetics but often sacrifices stability due to extensive metal ablation during industrial electrolysis. Here, an ions migration‐induced stabilization strategy is introduced explore robust catalysts for OER. The present approach involving cathodic polarization of Fe‐rich NiFe‐layered double hydroxides (LDH) facilitates selective substitution Ni with Fe cations and deep oxyanions OH ‐ , leading decreased layer thickness, enriched sites, aggravated lattice distortion reorganized NiFe‐LDH (R‐NiFe‐LDH). Correspondingly, R‐NiFe‐LDH fully transforms into γ‐(NiFe)OOH retained nanosheet morphology, reduced distortions, dramatically inhibited dissolution prolonged It achieves exceptional durability at 500 mA cm −2 retaining ≈90% over 5 days, substantially outperforming pristine (50% loss). Over 2 months, delivers only a 70 mV overpotential increase, whereas decays by 140 just 75 h. An anion exchange membrane water electrolyzer applying as both electrodes exhibit zero decay 1000 100 h, compared rate 3.6 h −1 the counterpart. This work showcases straightforward engineering atomic arrangements toward
Язык: Английский
Процитировано
1
ACS Materials Letters, Год журнала: 2024, Номер unknown, С. 3548 - 3556
Опубликована: Июль 11, 2024
Язык: Английский
Процитировано
5
Inorganic Chemistry Frontiers, Год журнала: 2024, Номер 11(21), С. 7426 - 7436
Опубликована: Янв. 1, 2024
We designed an ASCs based on curled MOF nanosheets. Due to the Jahn–Teller effect and lattice strain "double enhance" conductivity regulate nanostructure of MOF, which results in a high energy density assembled ASCs.
Язык: Английский
Процитировано
5
Science China Chemistry, Год журнала: 2024, Номер 67(10), С. 3468 - 3481
Опубликована: Авг. 16, 2024
Язык: Английский
Процитировано
4
Small, Год журнала: 2025, Номер unknown
Опубликована: Фев. 21, 2025
Abstract NiFe‐layered double hydroxides (LDHs) are promising electrocatalysts for the oxygen evolution reaction (OER) in alkaline media. Here, operando X‐ray diffraction (XRD) and total scattering used with Pair Distribution Function (PDF) analysis to investigate atomic structure of catalytically active material follow structural changes under operating conditions. XRD shows an interlayer contraction applied oxidative potential, which relates a transition from α‐LDH γ‐LDH phase. The phase is reversible, recovered at 1.3 VRHE. However, PDF irreversible increase stacking disorder conditions, along decrease LDH sheet size. thus that conditions induce breakdown particles leading crystallite
Язык: Английский
Процитировано
0
Applied Catalysis B Environment and Energy, Год журнала: 2025, Номер unknown, С. 125251 - 125251
Опубликована: Март 1, 2025
Язык: Английский
Процитировано
0
Advanced Functional Materials, Год журнала: 2025, Номер unknown
Опубликована: Апрель 24, 2025
Abstract Anion exchange membrane water electrolysis (AEMWE) offers a promising route for green hydrogen production avoiding noble metal catalysts. The sluggish oxygen evolution reaction (OER) kinetics constrained by the intrinsic activity and limited abundance of active sites however remains significant barrier to advancement AEMWE. In this study, heteroatom doping is combined with molybdate‐leaching strategy enhance both site in single catalyst. Iron doped into nickel molybdate through microwave‐assisted method, followed molybdenum leaching, formed molybdate‐derived Fe‐doped hydroxide (MD‐FeNi). synergistic effects bimetallic composition expanded surface area facilitate transformation Ni(OH) 2 MD‐FeNi NiOOH, significantly enhancing OER activity. When integrated an AEMWE system, catalyst achieves impressive current density 7.48 A cm −2 at V, which ≈2.2 2.0 times higher than that derived (3.35 ) traditional Fe (3.75 ). Furthermore, binary high‐activity system has demonstrated broad applicability across various catalytic systems, Ag‐doped copper high‐efficient CO electroreduction cobalt NaBH 4 hydrolysis reaction, indicating its potential diverse applications.
Язык: Английский
Процитировано
0
Applied Catalysis B Environment and Energy, Год журнала: 2025, Номер unknown, С. 125435 - 125435
Опубликована: Май 1, 2025
Язык: Английский
Процитировано
0