Dessie Tesfaye Alamirew, Seifu Lemlem Seyoum, Dilebo Woldesenbet Bafe
Faculty of Chemical and Food Engineering, Bahir Dar Institute of Technology, Bahir Dar University, Bahir Dar, 79, Ethiopia.
Department of Chemistry, College of Natural and Computational Science, Jinka University, Jinka, 555, Ethiopia.
ChemistryOpen. 2025 Sep;14(9):e202500033. doi: 10.1002/open.202500033. Epub 2025 May 2.
Chlorine-coordinated iron phthalocyanine is designed and synthesized for 4 e pathway oxygen reduction reaction (ORR). Iron phthalocyanine (FePc) is a promising nonprecious catalyst for the ORR. Unfortunately, FePc with plane-symmetric Fe-N4 site usually exhibits an unsatisfactory ORR activity due to its poor O adsorption and activation. In this work, Chlorine-coordinated iron phthalocyanine (Cl-FePc) has been studied as a catalyst for the electrochemical ORR. Coordination of iron phthalocyanine with chlorine introduces additional active sites for ORR, improving its catalytic activity. The chlorine atoms enhance the electron transfer process and facilitate the ORR validated by in situ Raman spectroscopy. The obtained catalyst exhibits fast kinetics for O adsorption and activation with an ultralow Tafel slope of 30 mV dec and a remarkable half-wave potential of 0.80 V. This work offers a new strategy to regulate catalytic sites for better performance ORR.
氯配位铁酞菁被设计并合成用于4电子途径氧还原反应（ORR）。铁酞菁（FePc）是一种有前景的ORR非贵金属催化剂。不幸的是，具有平面对称Fe-N4位点的FePc由于其较差的O吸附和活化能力，通常表现出不令人满意的ORR活性。在这项工作中，氯配位铁酞菁（Cl-FePc）已被研究作为电化学ORR的催化剂。铁酞菁与氯的配位引入了额外的ORR活性位点，提高了其催化活性。氯原子增强了电子转移过程，并通过原位拉曼光谱验证促进了ORR。所获得的催化剂表现出快速的O吸附和活化动力学，具有30 mV dec的超低塔菲尔斜率和0.80 V的显著半波电位。这项工作提供了一种新策略来调节催化位点以实现更好性能的ORR。
