Barrio Jesús, Pedersen Angus, Feng Jingyu, Sarma Saurav Ch, Wang Mengnan, Li Alain Y, Yadegari Hossein, Luo Hui, Ryan Mary P, Titirici Maria-Magdalena, Stephens Ifan E L
Department of Materials, Royal School of Mines, Imperial College London London SW27 AZ England UK
Department of Chemical Engineering, Imperial College London London SW7 2AZ England UK
J Mater Chem A Mater. 2022 Feb 11;10(11):6023-6030. doi: 10.1039/d1ta09560a. eCollection 2022 Mar 15.
Single-atom catalysts, in particular the Fe-N-C family of materials, have emerged as a promising alternative to platinum group metals in fuel cells as catalysts for the oxygen reduction reaction. Numerous theoretical studies have suggested that dual atom catalysts can appreciably accelerate catalytic reactions; nevertheless, the synthesis of these materials is highly challenging owing to metal atom clustering and aggregation into nanoparticles during high temperature synthesis treatment. In this work, dual metal atom catalysts are prepared by controlled post synthetic metal-coordination in a CN-like material. The configuration of the active sites was confirmed by means of X-ray adsorption spectroscopy and scanning transmission electron microscopy. During oxygen reduction, the catalyst exhibited an activity of 2.4 ± 0.3 A g at 0.8 V a reversible hydrogen electrode in acidic media, comparable to the most active in the literature. This work provides a novel approach for the targeted synthesis of catalysts containing dual metal sites in electrocatalysis.
单原子催化剂，特别是Fe-N-C材料家族，已成为燃料电池中铂族金属作为氧还原反应催化剂的一种有前景的替代物。大量理论研究表明，双原子催化剂可以显著加速催化反应；然而，由于在高温合成处理过程中金属原子聚集成簇并聚合成纳米颗粒，这些材料的合成极具挑战性。在这项工作中，通过在类CN材料中进行可控的后合成金属配位来制备双金属原子催化剂。通过X射线吸附光谱和扫描透射电子显微镜确定了活性位点的构型。在氧还原过程中，该催化剂在酸性介质中相对于可逆氢电极在0.8 V时表现出2.4±0.3 A g的活性，与文献中最具活性的催化剂相当。这项工作为电催化中靶向合成含双金属位点的催化剂提供了一种新方法。
