Brotons-Alcázar Isaac, Torres-Cavanillas Ramón, Morant-Giner Marc, Cvikl Martin, Mañas-Valero Samuel, Forment-Aliaga Alicia, Coronado Eugenio
Instituto de Ciencia Molecular (ICMol), Universitat de València, c/Catedrático José Beltrán, 2, 46980 Paterna, Spain.
Dalton Trans. 2021 Nov 16;50(44):16281-16289. doi: 10.1039/d1dt02536h.
Transition metal chalcogenophosphates of general formula MPX have attracted recent interest in the field of 2D materials due to the possibility of tuning their properties upon reaching the 2D limit. Several works address this challenge by dry mechanical exfoliation. However, only a few of them use a scalable approach. In this work, we apply a general chemical protocol to exfoliate MnPS. The method employs in the first step chemical intercalation and liquid phase exfoliation and in the second step the addition of molecules used as capping agents on the inorganic layers. Therefore, molecules of different nature prompt the quality of the exfoliated material and its stabilization in an aqueous solution, opening the possibility of using these functionalized layers in several fields. Here we illustrate this possibility in electrochemistry. Thus, we show that when polyethylenimine is used as the capping agent, it is possible to reach a compromise between the stability of high quality MnPS flakes in aqueous suspension and their optimum performance as an electrocatalytic system for HER activity.
通式为MPX的过渡金属硫代磷酸盐由于在达到二维极限时可调节其性能，最近在二维材料领域引起了关注。一些研究通过干机械剥离来应对这一挑战。然而，其中只有少数采用了可扩展的方法。在这项工作中，我们应用一种通用的化学方案来剥离MnPS。该方法第一步采用化学插层和液相剥离，第二步在无机层上添加用作封端剂的分子。因此，不同性质的分子会影响剥离材料的质量及其在水溶液中的稳定性，从而为在多个领域使用这些功能化层开辟了可能性。在此我们展示了在电化学领域的这种可能性。因此，我们表明，当使用聚乙烯亚胺作为封端剂时，在高质量MnPS薄片在水悬浮液中的稳定性与其作为HER活性电催化系统的最佳性能之间可以达成折衷。
