Fabrication and electrochemical investigations of nanostructured PtSn-NiTiO3 heterostructured electrocatalysts for direct methanol oxidation

IF 2 3区化学 Q4 CHEMISTRY, PHYSICAL

Chemical Physics Pub Date : 2024-11-12 DOI:10.1016/j.chemphys.2024.112516

V. Chellasamy , P. Thangadurai

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Abstract

The methanol oxidation reaction of a PtSn nanoparticle decorated NiTiO₃ nanostructured material system is reported in this paper. NiTiO₃ and PtSn nanoparticles were formed in rhombohedral and cubic phases, respectively. The crystallite size of the PtSn nanoparticles was calculated to be 2.8 nm from the XRD peak parameters and TEM studies. The surface plasmon resonance peak observed at 308 nm indicates the decoration of PtSn-NiTiO₃ nanostructures with Pt nanoparticles on the surface. The chemical oxidation states investigated by XPS showed a metallic state of Pt and Sn with a small amount of surface oxidization. From the electrochemical analysis, the Pt_0.5Sn_0.5-NiTiO₃ nanostructures showed superior electrocatalytic performance with higher electrochemical surface area (252 m²/g), high current density (196 mA/cm²), lower Tafel value (161.31 mV/dec) and small charge transfer resistance. This work demonstrated that the Pt_0.5Sn_0.5 −NiTiO₃ nanostructure would be a suitable electrocatalyst for oxidation for methanol in DMFC.

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用于直接甲醇氧化的纳米结构 PtSn-NiTiO3 异质结构电催化剂的制备和电化学研究

本文报告了铂硒纳米粒子装饰的 NiTiO3 纳米结构材料体系的甲醇氧化反应。NiTiO3 和 PtSn 纳米粒子分别以斜方体和立方体形式形成。根据 XRD 峰参数和 TEM 研究，计算出 PtSn 纳米粒子的结晶尺寸为 2.8 nm。在 308 nm 处观察到的表面等离子共振峰表明，PtSn-NiTiO3 纳米结构的表面装饰有铂纳米粒子。通过 XPS 调查的化学氧化态显示，铂和锡处于金属态，表面有少量氧化。从电化学分析来看，Pt0.5Sn0.5-NiTiO3 纳米结构具有较高的电化学比表面积（252 m2/g）、较高的电流密度（196 mA/cm2）、较低的塔菲尔值（161.31 mV/dec）和较小的电荷转移电阻，显示出卓越的电催化性能。这项研究表明，Pt0.5Sn0.5 -NiTiO3 纳米结构将成为 DMFC 中甲醇氧化的合适电催化剂。

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来源期刊

Chemical Physics 化学-物理：原子、分子和化学物理

CiteScore

4.60

自引率

4.30%

发文量

278

审稿时长

39 days

期刊介绍： Chemical Physics publishes experimental and theoretical papers on all aspects of chemical physics. In this journal, experiments are related to theory, and in turn theoretical papers are related to present or future experiments. Subjects covered include: spectroscopy and molecular structure, interacting systems, relaxation phenomena, biological systems, materials, fundamental problems in molecular reactivity, molecular quantum theory and statistical mechanics. Computational chemistry studies of routine character are not appropriate for this journal.