无粘结剂FeNi MOF电催化剂中fe诱导稳定γ-NiOOH增强析氧的实时监测

IF 13 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Small Pub Date : 2025-04-24 DOI:10.1002/smll.202501142

Kuan-Lun Chen, Yu-Hsuan Chou, Tsai-Jen Lin, Mu-Jeng Cheng, Po-Keng Hsiao, Ying-Chih Pu, I-Wen Peter Chen

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引用次数: 0

摘要

氢能是一种很有前途的可再生能源，金属有机骨架（mof）由于其丰富的活性位点、高孔隙率和大表面积而被认为是潜在的水电解电催化剂。采用无粘结剂的一锅法，将泡沫镍（NF）浸泡在苯-1,3,5-三羧酸（BTC）、N，N-二甲基甲酰胺（DMF）和铁（Fe）盐的溶液中，合成了双金属铁-镍-苯-1,3,5-三羧酸/泡沫镍（FeNi-BTC/NF） MOF。FeNi-BTC/NF在100 mA cm−2下的过电位为276 mV， Tafel斜率为94 mV dec−1，稳定性超过120 h。Fe-Ni相互作用有助于形成稳定的γ-羟基氧化镍（γ-NiOOH）相，防止其还原为羟基化镍（Ni(OH) 2），这对提高析氧反应（OER）性能至关重要。通过原位拉曼光谱电化学分析发现，这种相变增强了电催化活性。此外，高价Fe调节Ni的电子结构，使FeNi-BTC/NF在更高的电位下转化为γ-NiOOH， Fe和γ-NiOOH协同提高OER效率。这些发现为Fe/Ni原子相互作用和FeNi-BTC/NF mof的相变提供了新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Real-Time Monitoring of Fe-Induced Stable γ-NiOOH in Binder-Free FeNi MOF Electrocatalysts for Enhanced Oxygen Evolution

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Real-Time Monitoring of Fe-Induced Stable γ-NiOOH in Binder-Free FeNi MOF Electrocatalysts for Enhanced Oxygen Evolution

Hydrogen energy is a promising renewable source, and metal-organic frameworks (MOFs) are considered potential electrocatalysts for water electrolysis due to their abundant active sites, high porosity, and large surface area. The synthesis of bimetallic iron-nickel-benzene-1,3,5-tricarboxylate/nickel foam (FeNi-BTC/NF) MOF is reported using a binder-free one-pot method by immersing nickel foam (NF) into a solution of benzene-1,3,5-tricarboxylic acid (BTC), N,N-dimethylformamide (DMF), and iron (Fe) salts. FeNi-BTC/NF exhibits a low overpotential of 276 mV at 100 mA cm⁻², a Tafel slope of 94 mV dec⁻¹, and stability exceeding 120 h. The Fe-Ni interaction facilitates the formation of a stable gamma-nickel oxyhydroxide (γ-NiOOH) phase, preventing its reversion to nickel hydroxyide (Ni(OH)₂), which is crucial for improving oxygen evolution reaction (OER) performance. This phase transition, revealed via in situ Raman spectroelectrochemical analysis, enhances electrocatalytic activity. Additionally, high-valent Fe modulates the electronic structure of Ni, enabling FeNi-BTC/NF to transform into γ-NiOOH at higher potentials, with Fe and γ-NiOOH synergistically boosting OER efficiency. The findings offer insights into Fe/Ni atom interactions and phase transformations in FeNi-BTC/NF MOFs for enhanced water splitting.

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来源期刊

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.