Metal (Mn, Fe, Co, Ni, Cu, and Zn) Phthalocyanine-Immobilized Mesoporous Carbon Nitride Materials as Durable Electrode Modifiers for the Oxygen Reduction Reaction

• DOI: 10.1021/acs.langmuir.0c01822
• Publication Date: 2020-09-24T21:40:14Z
• Authors: Devesh Kumar Singh; Vellaichamy Ganesan; Dharmendra Kumar ...; Mamta Yadav
• Keywords: Overpotential; Carbon fibers; Carbon nitride

In the search for alternative sources to replace fossil fuels, carbon nitride materials can be used in a variety of ways. present work, porosity is introduced material using mesoporous silica material, MCM-41, as hard template, and (MCN) synthesized. Further, MCN modified by immobilizing metal phthalocyanine (MPc, where M = Mn, Fe, Co, Ni, Cu, Zn). The resulting MPc-incorporated (MPc@MCN) were tested electrocatalytic oxygen reduction reaction (ORR) acidic basic media. Detailed studies reveal that FePc@MCN CoPc@MCN exhibit higher ORR activity than other composites 0.1 KOH. follows direct four-electron mechanism shows onset potential (vs RHE) at 0.93 V (in KOH), which very close exhibited state-of-the-art Pt-C (1.0 V), several similar MPc with supports environments. Besides, due inherent property coordination through nitrogen on MCN, excellent stability even after 3000 cyclic voltammetry (CV) cycles. was found have better methanol tolerance comparison medium. highly selective two-electron both media lower overpotential many reported catalysts reduction. Therefore, these (FePc@MCN CoPc@MCN) suitable alternatives Pt expensive related applications.