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首页> 外文期刊>Nanotechnology >Preparation of a nanoporous active tungsten foil by two-step anodizing and deoxidized annealing for hydrogen evolution reaction
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Preparation of a nanoporous active tungsten foil by two-step anodizing and deoxidized annealing for hydrogen evolution reaction

机译：通过两步阳极氧化和脱氧退火的纳米多孔活性钨箔进行氢气进化反应的制备

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摘要

Nanoporous metals made by anodizing represent a class of active materials with unique structural properties. In this work, nanoporous active W foils (NPAWFs) are prepared via two-step anodizing and deoxidized annealing in hydrogen atmosphere. During the course of this research, the anodizing and annealing conditions have been optimized systematically. The morphology, composition and catalytic property of as-prepared NPAWFs have been characterized by field-emission scanning electron microscope, energy dispersive spectrometer, x-ray diffraction and electrochemical measurements. The final results show that a reduction in the anodizing voltage from 60 V for 60 min to 40 V for 60 min causes better growth of nanoporous structure, and the deoxidation at 700 degrees C for 3 h can remove oxygen in the nanoporous layer while retaining the nanoporous structure and activity. Compared with non-treated W foil, the NPAWF exhibits superior hydrogen evolution reaction (HER) activity with a low onset overpotential of 199 mV and Tafel slope of 84 mV dec(-1) due to its nanoporous structure and large specific surface area. Additionally, the NPAWF shows outstanding long-term stability in acidic media, indicating it is a promising transition metal HER electrocatalyst and can also be used as a high active matrix material.
机译：通过阳极氧化制造的纳米多孔金属代表一类具有独特结构性质的活性材料。在这项工作中，通过在氢气氛中通过两步阳极氧化和脱氧的退火制备纳米多孔活性W箔（NPAWF）。在本研究过程中，系统地优化了阳极氧化和退火条件。通过现场发射扫描电子显微镜，能量分散光谱仪，X射线衍射和电化学测量的特征在于制备的NPAWF的形态，组合物和催化性。最终结果表明，60m至40V的阳极氧化电压降低60分钟导致纳米多孔结构的更好生长，并且700℃的脱氧可以在保持纳米多孔层中除去氧气纳米多孔结构和活动。与未治疗的W箔相比，NPAWF由于其纳米多孔结构和大的比表面积，具有89mV和84mV DEC（-1）的低发作过度的氢进化反应（其）活性。另外，NPAWF在酸性培养基中显示出突出的长期稳定性，表明它是一种有望的过渡金属来催化剂，也可以用作高活性基质材料。

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