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Preparation of FeNi-based nanoporous amorphous alloy films and their electrocatalytic oxygen evolution properties
International Journal of Hydrogen Energy ( IF 7.2 ) Pub Date : 2023-03-07 , DOI: 10.1016/j.ijhydene.2023.02.079
Dianjin Ding, Jinzhao Huang, Jun Tang, Sixuan Zhang, Xiaolong Deng

The progress of this research is the preparation of FeNi alloy thin films by magnetron sputtering. Each step of the experimental process is based on the electrocatalytic performance of the sample, and characterized by many characterizations means such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), X-ray energy spectrometry (EDS) and step gauge thickness test for morphology, structure and elemental composition, etc. The analysis of the characterization results is used as a support for the experimental process. Adjustment of various preparation process parameters for material growth and subsequent processing include doping of non-metallic elements and construction of nanostructures. Doping of C elements can make FeNi based alloy films further amorphous. Zn element is used as a pore-forming agent. The two processes of doping and high-temperature vacuum dealloying can make the film obtain a nanoporous structure, which greatly increases the specific surface area. These two strategies reduce the overpotential (η10) of oxygen evolution reaction (OER) of FeNi alloy thin films to 393 mV and 314 mV, which are reduced by 47 mV and 79 mV step by step. The electrochemical properties of the finally obtained alloy film are: overpotential of 314 mV, Tafel slope of 61.8 mV/dec and the stability of only 10% decay at a current density of 10 mA/cm2 for 12 h. In this study, low-cost transition metals were used as the main materials to design OER catalysts, and the catalytic efficiency was comparable to that of commercial noble metal catalysts. The physical preparation methods made each sample have good reproducibility. It provides the experimental basis and theoretical basis for the design and synthesis of new catalytic materials at a higher level.



中文翻译:

FeNi基纳米多孔非晶合金薄膜的制备及其电催化析氧性能

本研究的进展是采用磁控溅射法制备FeNi合金薄膜实验过程的每一步都是基于样品的电催化性能,通过X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、X-对形貌、结构和元素组成等进行射线能谱分析(EDS)和阶梯厚度测试,对表征结果进行分析,作为实验过程的支撑。调整材料生长的各种制备工艺参数后续加工包括非金属元素的掺杂和纳米结构的构建。C元素的掺杂可以使FeNi基合金薄膜进一步非晶化。Zn元素用作造孔剂。掺杂和高温真空脱合金两个过程可以使薄膜获得纳米多孔结构,大大增加了比表面积。这两种策略将FeNi合金薄膜的析氧反应(OER)的过电位(η10)降低到393 mV和314 mV,并逐步降低47 mV和79 mV。这最终得到的合金薄膜的电化学性能为:过电位314 mV,Tafel斜率61.8 mV/dec,在10 mA/cm2电流密度下12 h仅衰减10%的稳定性。本研究以低成本的过渡金属为主要材料设计了OER催化剂,催化效率与商业贵金属催化剂相当。物理制备方法使每个样品具有良好的重现性。为更高水平的新型催化材料的设计与合成提供实验依据和理论依据。

更新日期:2023-03-07
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