IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Li Ma, Nikolaos Antonios Iaktnthos Nemet, Martin Bremholm, Zhaozong Sun, Anders Koldby Vestergaard, Zheshen Li, Jeppe V. Lauritsen
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引用次数: 0

摘要

本研究利用同步辐射 X 射线光谱学(XPS)研究了拓扑韦尔半金属 Co3Sn2S2 的表面成分演变,该金属被认为是超高真空(UHV)到催化反应条件下水分离的活性催化剂。我们发现,在环境空气中裂解的表面完全氧化,形成钴氧化物和锡氧化物/氢氧化物。该表面显示出 503 mV 的过电位,以达到 10 mA cm-2 的电流密度进行 OER。然而,超高压裂解表面保持了 Co3Sn2S2 的原始特征,与空气裂解样品相比,显示出明显缓慢的动力学特性。在各种暴露条件下系统跟踪氧化过程发现,在超高压下暴露于 O2 和 H2O 时,会形成少量的锡氧化物,而在大气条件下,锡和液态水之间会发生强烈的相互作用。相反,较高的暴露压力会促进钴的氧化,从而在大气中形成钴氧化物,这与催化活性的增强有关。尽管在表面稳健性方面存在不利的证据,但这项工作为了解 Co3Sn2S2 表面的反应性提供了重要的启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Surface compositional modification of Weyl semimetal Co3Sn2S2(0001) from vacuum to electrochemical water splitting conditions

Surface compositional modification of Weyl semimetal Co3Sn2S2(0001) from vacuum to electrochemical water splitting conditions
This study investigates the surface compositional evolution of the topological Weyl semimetal Co3Sn2S2, proposed to be an active catalyst for water splitting, from ultra high vacuum (UHV) to catalytic reaction conditions, using synchrotron X-ray spectroscopy (XPS). We found that the surface cleaved in ambient air is completely oxidized, forming Co oxides and Sn oxides/hydroxides. This surface exhibits an overpotential of 503 mV to achieve a current density of 10 mA cm−2 for OER. However, the UHV-cleaved surface maintains Co3Sn2S2 pristine features, showing remarkably slow kinetics compared to the air-cleaved sample. Systematically tracking the oxidation process under various exposure conditions reveals that a small amount of Sn oxides forms upon exposures to O2 and H2O under UHV, while a strong interaction between Sn and liquid water occurs at atmosphere conditions. In contrast, higher exposed pressure promotes Co oxidation, resulting in the formation of Co oxides in atmospheric air, which correlates with enhanced catalytic activity. Despite unfavorable evidence regarding the surface robustness, this work provides crucial insights into Co3Sn2S2 surface reactivity.
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来源期刊
Applied Surface Science
Applied Surface Science 工程技术-材料科学:膜
CiteScore
12.50
自引率
7.50%
发文量
3393
审稿时长
67 days
期刊介绍: Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.
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