Liberman Itamar, He Wenhui, Shimoni Ran, Ifraemov Raya, Hod Idan
Department of Chemistry , Ilse Katz Institute for Nanoscale Science and Technology , Ben-Gurion University of the Negev , Beer-Sheva , 8410501 , Israel . Email:
Chem Sci. 2019 Nov 6;11(1):180-185. doi: 10.1039/c9sc04141a. eCollection 2020 Jan 7.
There is an on-going search for new earth-abundant electrocatalytic materials, suitable for replacing noble-metals as efficient accelerators of energy-conversion reactions. In this regard, over the last few years, metal-organic framework (MOF)-converted materials have demonstrated promising electrocatalytic properties. Nevertheless, the discovery of new catalytic materials requires development of methods combining high-throughput synthesis and electrochemical-activity screening. To do so, here we couple the synthetical and the analytical virtues of scanning electrochemical microscopy (SECM). Namely, we first utilized an SECM tip electrode to induce spatially confined (μm-scale) electrochemical conversion of cobalt-based ZIF-67 MOFs into patterns of cobalt sulfide with a tuned chemical composition. In turn, the same SECM setup was used to map the H evolution activity of the as-formed cobalt sulfide. Hence, the presented method should have great implications for future screening of new electrocatalytic materials for a variety of energy-related applications.
目前正在寻找新的储量丰富的地球电催化材料，以取代贵金属作为能量转换反应的高效促进剂。在这方面，在过去几年中，金属有机框架（MOF）转化材料已显示出有前景的电催化性能。然而，新催化材料的发现需要开发结合高通量合成和电化学活性筛选的方法。为此，我们在此结合了扫描电化学显微镜（SECM）的合成和分析优点。具体而言，我们首先利用SECM尖端电极诱导钴基ZIF-67 MOF在空间上受限（微米尺度）的电化学转化，形成具有调谐化学成分的硫化钴图案。反过来，使用相同的SECM装置来绘制所形成的硫化钴的析氢活性。因此，所提出的方法对于未来筛选用于各种能量相关应用的新型电催化材料应该具有重大意义。
