Single atom Fe-based catalyst derived from hierarchical (Fe, N)-ZIF-8/CNFs for high-efficient ORR activity. (21st September 2022) - Miao, Wenfang
Abstract : (i) The three-dimensional conductive network of CNFs improves intrinsic activity. (ii) Fe–Phen complex encapsulated in ZIF-8 provides atomically dispersed FeN x sites. (iii) Hierarchical Fe–N x –CNFs presents excellent ORR performance. Abstract : The development of high-efficiency, stable, and low-cost Fe–N–C electrocatalysts for the oxygen reduction reaction (ORR) has attracted considerable attention. Herein, a stable atomically dispersed Fe–N x -based catalyst was synthesized from a hierarchical structure involving carbon nanofiber (CNF)-supported zeolitic-imidazolate-framework-8 (ZIF-8) encapsulated Fe–Phen complex ((Fe, N)-ZIF-8/CNFs). The Fe–N x –CNFs obtained from the pyrolysis of (Fe, N)-ZIF-8/CNFs showed a good hierarchical multi-layer structure. The natural network structure of the carbon nanofibers serves as a matrix to uniformly distribute the ZIF-8 particles, and the Fe–N x sites derived from the Fe–Phen complex were uniformly distributed in ZIF-8 particles. It exhibits excellent ORR performance with a high half-wave potential of 0.875 V ( vs. RHE), which was 55 mV higher than that of the commercial Pt/C catalyst. In addition, density functional theory (DFT) calculations on the catalyst further revealed the origin of the ORR activity via a 4e − pathway from the precise local coordination of FeN4 sites.