材料科学
过电位
X射线光电子能谱
塔菲尔方程
氧化物
铜
催化作用
析氧
扫描电子显微镜
纳米纤维
氧化铜
化学工程
分析化学(期刊)
纳米技术
电化学
物理化学
复合材料
冶金
化学
生物化学
电极
色谱法
工程类
作者
Alessandra Patrícia de Araújo Dantas,Rafael A. Raimundo,Pedro de Lima Neto,Caio M. S. Lopes,Jakeline R.D. Santos,Francisco J.A. Loureiro,Tatiany Barata Pereira,Marco A. Morales,Eliton S. Medeiros,Daniel A. Macedo
标识
DOI:10.1016/j.ceramint.2024.01.213
摘要
In this work, we report copper oxide nanofibers (CuO – N) synthesized by Solution Blow Spinning (SBS) for oxygen evolution reaction (OER), and their comparison with a control sample based on a commercial powder (CuO – C). Both materials were characterized by various techniques, including X-ray diffraction (XRD), magnetometry, scanning electron microscopy (SEM), and spectroscopy (Fourier transform infrared (FT-IR), Raman and X-ray photoelectron (XPS)) to confirm the purity, and microstructural and surface chemical properties. Subsequently, the performance of copper oxide catalysts in a 1.0 M KOH solution was investigated. Copper oxide with nanofiber morphology (CuO – N) exhibited a small overpotential of 385 mV @ 10 mA cm−2 and a Tafel coefficient of only 76 mV dec−1, i.e., fast kinetics for water splitting, a result that is modulated by oxygen vacancies (O2/O1 = 0.83). The oxygen vacancies are due to the presence of Cu1+ in the lattice. The analyses of the magnetization measurements at 5 K suggest a larger amount of Cu1+ in sample CuO – N. Therefore, this work sheds light on how to design low-cost nanofibrous catalysts based on abundant transition metals in the earth's crust by SBS, an economical and scalable technique, which is promising for energy applications.
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