Synergistic coupling of defective SOx-containing carbon and iron phthalocyanine for efficient oxygen reduction†
Abstract
Iron phthalocyanine (FePc) has emerged as a viable non-precious metal catalyst for the oxygen reduction reaction (ORR), offering a potential substitute for costly precious metals. However, fine-tuning its electronic structure to optimize intermediate adsorption remains a challenge. In this study, we report a significant enhancement of the ORR catalytic activity of FePc through a synergistic interaction with a defective SOx-enriched carbon substrate. Our experimental and theoretical investigations reveal that the introduction of SOx groups via ultrasonication effectively modifies the electronic configuration of the Fe–N4 center, facilitating the desorption of OH* intermediates. The resulting U-FePc@DSNC catalyst exhibits exceptional catalytic activity and stability in alkaline media, achieving a remarkable half-wave potential (E1/2) of 0.93 V. This approach offers a promising strategy for precise modulation of the adsorption properties of Fe-based active centers, paving the way for the development of highly efficient and cost-effective ORR catalysts.
- This article is part of the themed collection: 2024 Inorganic Chemistry Frontiers HOT articles