CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology, Beijing 100190, China.
Nanoscale. 2017 May 4;9(17):5641-5647. doi: 10.1039/c7nr00895c.
Two-dimensional transition-metal dichalcogenides (TMDs) have attracted much research interest in the hydrogen evolution reaction (HER) due to their superior electrocatalytic properties. Beyond binary TMDs, ternary TMD alloys, as electrocatalysts, were also gradually acknowledged for their remarkable efficiency in HER. Herein, we successfully synthesized monolayer dendritic ternary WSSe flakes possessing abundant active edge sites on a single crystalline SrTiO (STO(100)). And the obtained dendritic WSSe flakes could be transferred intact to arbitrary substrates, for example, SiO/Si and Au foils. Intriguingly, the transferred dendritic WSSe flakes on Au foil demonstrate a significant HER performance, reflected by a rather lower Tafel slope of ∼69 mV dec and a much higher exchange current density of ∼50.1 μA cm outshining other CVD-grown two-dimensional TMD flakes. Furthermore, our new material shows excellent stability in electro-catalyzing the HER, suggestive of its robustness for being an excellent electrocatalyst. We believe that this work broadens the outlook for the synthesis of two-dimensional TMDs toward satisfying the applications in electrocatalysis.
二维过渡金属二硫属化物（TMDs）由于其优异的电催化性能，在析氢反应（HER）中引起了广泛的研究兴趣。除了二元 TMDs 之外，三元 TMD 合金作为电催化剂，其在 HER 中的高效性也逐渐得到认可。在此，我们成功合成了单层树枝状三元 WSSe 薄片，在单晶 SrTiO（STO（100））上具有丰富的活性边缘位。并且获得的树枝状 WSSe 薄片可以完整地转移到任意基底上，例如 SiO2/Si 和金箔。有趣的是，在金箔上转移的树枝状 WSSe 薄片表现出显著的 HER 性能，其塔菲尔斜率相当低约为 69 mV dec，交换电流密度高得多约为 50.1 μA cm，优于其他 CVD 生长的二维 TMD 薄片。此外，我们的新材料在电催化析氢中表现出优异的稳定性，表明其作为一种优秀的电催化剂具有很强的鲁棒性。我们相信这项工作拓宽了二维 TMDs 的合成前景，以满足电催化应用的需求。
