Surface states in bulk single crystal of topological semimetal Co3Sn2S2 toward water oxidation
Surface states in bulk single crystal of topological semimetal Co3Sn2S2 toward water oxidation
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DOI：
10.1126/sciadv.aaw9867
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发表时间：
2019-08-01
期刊：
影响因子：
13.6
通讯作者：
Felser, Claudia
中科院分区：
文献类型：
--
作者：
Li, Guowei;Xu, Qiunan;Felser, Claudia
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（TSS）。它们强烈影响材料的表面电子结构，可以作为一个很好的平台，以了解表面反应。在这里，我们合成了高品质的大块单晶Co3Sn2S2，自然主机的拓扑半金属的能带结构。这保证了来自Co原子的稳健TSS的存在。Co_3Sn_2S_2晶体暴露出由Co原子构成的Kagome晶格，具有较高的电导率。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定制TSS的高活性电催化剂的合理设计的重要性。
The band inversion in topological phase matters bring exotic physical properties such as the topologically protected surface states (TSS). They strongly influence the surface electronic structures of the materials and could serve as a good platform to gain insight into the surface reactions. Here we synthesized high-quality bulk single crystals of Co3Sn2S2 that naturally hosts the band structure of a topological semimetal. This guarantees the existence of robust TSS from the Co atoms. Co3Sn2S2 crystals expose 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 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 TSS for the rational design of high-activity electrocatalysts.