Efficient Fe–Nx/C electrocatalyst for the oxygen reduction reaction derived from porphyrin-encapsulated zeolitic imidazolate frameworks. (18th March 2021)

• Record Type: Journal Article
• Authors: Park, Jungwon; Kim, Byung Hoon; Kim, Miyeon; Mun, Junyoung; Lee, Chang Yeon
• Is Part Of: New journal of chemistry. Volume 45:Number 13(2021)
• Page Start: 6018
• Page End: 6024
• Publication Date: 2021-03-18
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d1nj00102g
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Carbon-supported porphyrin-encapsulated and -functionalized zeolitic imidazole frameworks (ZIFs) were pyrolyzed to afford an efficient electrocatalyst for the oxygen reduction reaction (ORR). Abstract : The development of non-platinum catalysts for the oxygen reduction reaction (ORR) in fuel cells is an urgent challenge given the limited reserves of platinum. The Fe–N x /C electrocatalyst possessing isolated atomic metal active sites on N-doped carbon matrices is one of the most promising candidates for platinum-based catalyst alternatives because of its high efficiency and durability. Here carbon-supported porphyrin-encapsulated and -functionalized metal–organic frameworks (MOFs) have been synthesized to afford an Fe-implanted nitrogen-doped porous carbon electrocatalyst via pyrolysis. The fabricated electrocatalyst exhibited outstanding oxygen reduction catalytic activity with a half-wave potential of 0.916 V ( vs. RHE), surpassing state-of-the-art Pt/C (0.891 V). Durability tests revealed that the half-wave potential decreased by only 15 mV after 30 000 cycles. Abundant and well-separated atomic Fe–N x /C active sites in the catalyst play an essential role in the superior ORR activity.