Pt-decorated binary transition metal oxides (MnO-NiO, MnO-TiO2) for enhanced electrocatalysis of oxygen reduction and borohydride oxidation

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering B-advanced Functional Solid-state Materials Pub Date : 2024-10-03 DOI:10.1016/j.mseb.2024.117745

Marta Martins , Gamze Bozkurt , Ayşe Bayrakçeken , Gülin S. Pozan Soylu , Biljana Šljukić , Diogo M.F. Santos

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Abstract

Integrating transition metal oxides with precious metals is a strategic approach to designing cost-effective electrocatalysts with enhanced stability. Herein, platinum (Pt) nanoparticles (NPs) were prepared by microwave irradiation and anchored onto MnO and two binary metal oxides, MnO-NiO and MnO-TiO₂, obtained by solid-state dispersion. Voltammetric and electrochemical impedance spectroscopy techniques evaluated their performance for oxygen reduction reaction (ORR) and borohydride oxidation reaction (BOR) in alkaline media. Tafel slope and the number of exchanged electrons, n, were determined to compare the three electrocatalysts’ performance for fuel cell applications. Pt/MnO-NiO revealed a Tafel slope of 177 mV dec^–1 for ORR and an n value of ca. 4 and 3 e^- for ORR and BOR, respectively. These findings demonstrate that Pt NPs supported on binary metal oxide supports, particularly Pt/MnO-NiO, are promising electrocatalysts for ORR and BOR in alkaline media, thus recommending their use in direct borohydride fuel cells.

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铂装饰的二元过渡金属氧化物（MnO-NiO、MnO-TiO2）用于增强氧还原和硼氢化物氧化的电催化作用

将过渡金属氧化物与贵金属相结合是设计具有成本效益且稳定性更强的电催化剂的一种战略方法。本文采用微波辐照法制备了铂纳米颗粒（NPs），并将其锚定在氧化锰和两种二元金属氧化物（MnO-NiO 和 MnO-TiO2）上。伏安法和电化学阻抗谱技术评估了它们在碱性介质中进行氧还原反应（ORR）和硼氢化物氧化反应（BOR）的性能。测定了塔菲尔斜率和交换电子数 n，以比较三种电催化剂在燃料电池应用中的性能。Pt/MnO-NiO 在 ORR 中的塔菲尔斜率为 177 mV dec-1，在 ORR 和 BOR 中的 n 值分别约为 4 和 3 e-。这些研究结果表明，支撑在二元金属氧化物（尤其是 Pt/MnO-NiO）上的铂氮氧化物是在碱性介质中实现 ORR 和 BOR 的理想电催化剂，因此建议将其用于直接硼氢化燃料电池。

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来源期刊

Materials Science and Engineering B-advanced Functional Solid-state Materials 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.