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Edge-hosted Fe-N3 sites on a multiscale porous carbon framework combining high intrinsic activity with efficient mass transport for oxygen reduction

DOI: 10.1016/j.checat.2021.09.012 DOI Help

Authors: Jingjing Liu (Hunan University) , Zhichao Gong (Hunan University) , Christopher Allen (University of Oxford; Diamond Light Source) , Wen Ge (China University of Geosciences) , Haisheng Gong (Hunan University) , Jiangwen Liao (Beijing Synchrotron Radiation Facility) , Jianbin Liu (Hunan University) , Kang Huang (Hunan University) , Minmin Yan (Hunan University) , Rui Liu (Hunan University) , Guanchao He (Hunan University) , Juncai Dong (Beijing Synchrotron Radiation Facility) , Gonglan Ye (Hunan University) , Huilong Fei (Hunan University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chem Catalysis , VOL 3

State: Published (Approved)
Published: October 2021
Diamond Proposal Number(s): 27260

Abstract: Metal- and nitrogen-coordinated nanocarbons (M-N/Cs) represent the most promising nonprecious catalysts for the oxygen reduction reaction (ORR), but it remains challenging to simultaneously achieve high intrinsic activity, fast mass transport, and efficient utilization of active sites in a single catalyst. Herein, we design an Fe-N/C catalyst consisting of edge-hosted Fe-N3 sites dispersed on multiscale porous carbon frameworks (eFe-N3/PCF). The low coordination and edge effect of the Fe-N3 moieties endow eFe-N3/PCF with high intrinsic activity, while the enriched nanopores enable improved mass transport and atom utilization efficiency. When evaluated by a rotating disk electrode in the base, eFe-N3/PCF presents early-onset and half-wave potentials of 1.090 and 0.934 V versus the reversible hydrogen electrode, respectively. Furthermore, when employed as gas diffusion electrodes, eFe-N3/PCF displays excellent mass-transport efficiency that enables high-rate/power capabilities at practically high current densities. This work opens up opportunities for designing high-performance ORR electrocatalysts toward applications in diverse energy conversion and storage technologies.

Journal Keywords: edge-hosted Fe-N3 sites; high intrinsic activity; efficient mass transport; oxygen reduction

Diamond Keywords: Batteries; Fuel Cells

Subject Areas: Chemistry, Materials, Energy

Diamond Offline Facilities: Electron Physical Sciences Imaging Centre (ePSIC)
Instruments: E02-JEM ARM 300CF

Added On: 18/10/2021 10:40

Discipline Tags:

Catalysis Physical Chemistry Energy Energy Storage Materials Science Energy Materials Chemistry

Technical Tags:

Microscopy Electron Microscopy (EM) Scanning Electron Microscopy (SEM) Transmission Electron Microscopy (TEM)