arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.08567cond-mat.mtrl-sci
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拓扑半金属Co $_3$ Sn $_2$ S $_2$块体单晶中水氧化的表面态

Surface states in bulk single crystal of topological semimetal Co$_3$Sn$_2$S$_2$ towards water oxidation

Guowei Li, Qiunan Xu, Wujun Shi, Chenguang Fu, Lin Jiao, Machteld E. Kamminga, Mingquan Yu, Harun Tüysüz, Nitesh Kumar, Vicky Süß, Rana Saha, Abhay K. Srivastav… 展开作者

Guowei Li, Qiunan Xu, Wujun Shi, Chenguang Fu, Lin Jiao, Machteld E. Kamminga, Mingquan Yu, Harun Tüysüz, Nitesh Kumar, Vicky Süß, Rana Saha, Abhay K. Srivastava, Steffen Wirth, Gudrun Auffermann, Johannes Gooth, Stuart Parkin, Yan Sun, Enke Liu, Claudia Felser

摘要:

拓扑相物质的能带反转带来了奇异的物理性质,如拓扑保护表面态的出现。它们强烈地影响所研究材料的表面电子结构,并且可以作为一个很好的平台来深入了解表面反应的催化机制。在这里,我们合成了拓扑半金属Co $_3$ Sn $_2$ S $_2$的高质量块体单晶。我们发现,在室温下,Co $_3$ Sn $_2$ S $_2$自然地拥有拓扑半金属的能带结构。这就保证了Co原子表面态的存在。Co $_3$ Sn $_2$ S $_2$大块单晶暴露出由Co原子构成的Kagome晶格,具有高的电导率。它们作为析氧过程(OER)的催化中心,由于部分填充的$e_g$轨道,使成键和电子转移更有效。该块体单晶显示出优异的OER催化性能,尽管表面积比Co基纳米结构催化剂小得多。我们的研究结果强调了裁剪拓扑非平凡的表面状态的高活性电催化剂的合理设计的重要性。

英文摘要:

The band inversion in topological phase matters bring exotic physical properties such as the emergence of a topologically protected surface states. They strongly influence the surface electronic structures of the investigated materials and could serve as a good platform to gain insight into the catalytic mechanism of surface reactions. Here we synthesized high-quality bulk single crystals of the topological semimetal Co$_3$Sn$_2$S$_2$. We found that at room temperature, Co$_3$Sn$_2$S$_2$ naturally hosts the band structure of a topological semimetal. This guarantees the existence of robust surface states from the Co atoms. Bulk single crystal of Co$_3$Sn$_2$S$_2$ exposes their Kagome lattice that constructed by Co atoms and have high electrical conductivity. They serves as catalytic centers for oxygen evolution process (OER), making bonding and electron transfer more efficient due to the partially filled $e_g$ orbital. The bulk single crystal exhibits outstanding OER catalytic performance, although the surface area is much smaller than that of Co-based nanostructured catalysts. Our findings emphasize the importance of tailoring topological non-trivial surface states for the rational design of high-activity electrocatalysts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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