氢氧化镍析氧的光谱电化学分析：氧空位、电荷转移和丝素蛋白的作用

IF 4.4 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Advanced Materials Interfaces Pub Date : 2025-06-01 DOI:10.1002/admi.202500190

Eduardo R. do Nascimento, Michele L. de Souza, Alexandre G. Brolo, Wendel A. Alves

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引用次数: 0

摘要

研究了氢氧化镍（Ni(OH) 2）催化剂上的析氧反应（OER），重点研究了氧空位（Ov）、电荷转移和丝素蛋白在析氧反应中的作用。包括原位表面增强拉曼（SERS）和紫外可见光谱在内的光谱电化学技术表明，Ov形成和Ni到au的电荷转移促进了高价Ni和超氧化物的生成。提出了一种描述晶格氧参与的Mars-van Krevelen机制。研究发现，丝素蛋白通过降低关键中间体的活化能来提高催化活性，这一点从较高的传递系数和Tafel斜率分析中可以看出。在+300 mV过电位下，丝素修饰的样品的固有周转频率（tfs）为≈0.7 s⁻¹，优于无丝素修饰的样品（≈0.4 s⁻¹）。这些结果强调了结构缺陷和界面修饰之间的协同作用，以改善Ni(OH) 2基OER催化剂的可持续能源应用。

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Spectroelectrochemical Analysis of Oxygen Evolution by Nickel Hydroxide: Role of Oxygen Vacancies, Charge Transfer, and Silk Fibroin

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Spectroelectrochemical Analysis of Oxygen Evolution by Nickel Hydroxide: Role of Oxygen Vacancies, Charge Transfer, and Silk Fibroin

This study investigates the oxygen evolution reaction (OER) on nickel hydroxide (Ni(OH)₂) catalysts, focusing on the roles of oxygen vacancies (O_v), charge transfer, and silk fibroin. Spectroelectrochemical techniques, including in situ surface-enhanced Raman (SERS) and UV–vis spectroscopy, revealed that O_v formation and Ni-to-Au charge transfer facilitate the generation of high-valence Ni and superoxide species. A Mars–van Krevelen mechanism is proposed to describe the participation of lattice oxygen. Silk fibroin is found to enhance catalytic activity by lowering the activation energy of key intermediates, as indicated by higher transfer coefficients and Tafel slope analysis. At +300 mV overpotential, fibroin-modified samples exhibited intrinsic turnover frequencies (TOFs) of ≈0.7 s⁻¹, outperforming fibroin-free counterparts (≈0.4 s⁻¹). These results highlight the synergy between structural defects and interfacial modifications in improving Ni(OH)₂-based OER catalysts for sustainable energy applications.

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来源期刊

Advanced Materials Interfaces CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

8.40

自引率

5.60%

发文量

1174

审稿时长

1.3 months

期刊介绍： Advanced Materials Interfaces publishes top-level research on interface technologies and effects. Considering any interface formed between solids, liquids, and gases, the journal ensures an interdisciplinary blend of physics, chemistry, materials science, and life sciences. Advanced Materials Interfaces was launched in 2014 and received an Impact Factor of 4.834 in 2018. The scope of Advanced Materials Interfaces is dedicated to interfaces and surfaces that play an essential role in virtually all materials and devices. Physics, chemistry, materials science and life sciences blend to encourage new, cross-pollinating ideas, which will drive forward our understanding of the processes at the interface. Advanced Materials Interfaces covers all topics in interface-related research: Oil / water separation, Applications of nanostructured materials, 2D materials and heterostructures, Surfaces and interfaces in organic electronic devices, Catalysis and membranes, Self-assembly and nanopatterned surfaces, Composite and coating materials, Biointerfaces for technical and medical applications. Advanced Materials Interfaces provides a forum for topics on surface and interface science with a wide choice of formats: Reviews, Full Papers, and Communications, as well as Progress Reports and Research News.