Jump to main content
Jump to site search

Issue 34, 2018
Previous Article Next Article

A rationally designed Fe-tetrapyridophenazine complex: a promising precursor to a single-atom Fe catalyst for an efficient oxygen reduction reaction in high-power Zn–air cells

Author affiliations

Abstract

The development of low-cost and highly efficient single-atom oxygen reduction catalysts to replace platinum for fuel cells and metal–air cells is highly desirable but remains challenging. Herein, we report the fabrication of isolated single-atom Fe anchored on porous nitrogen-doped carbon from the pyrolysis of a well-designed solely Fe-tetrapyridophenazine coordination complex. The N-rich bridging ligand, tetrapyridophenazine (tpphz) is first employed as a spatial isolation agent of Fe that suppresses its aggregation during high temperature pyrolysis, resulting in highly reactive and stable single-atom Fe ORR catalysts. The catalyst shows remarkable ORR activity with a half-wave potential of 0.863 V versus the reversible hydrogen electrode (RHE) (21 mV more positive than that of commercial 20 wt% Pt/C) and excellent durability in 0.1 M KOH. Whereas in acidic media, the Fe single atoms also demonstrate ORR activity comparable to and stability much higher than those of Pt/C. Notably, Zn–air cells made using the as-prepared catalyst as the cathode provide a high open circuit voltage (1.53 V) and gravimetric energy density (947 W h kg−1), which are higher than commercial Pt/C based Zn–air cells (1.50 V and 828 W h kg−1). This work will open a new avenue to design single-atom catalysts for clean renewable energy storage and conversion devices.

Graphical abstract: A rationally designed Fe-tetrapyridophenazine complex: a promising precursor to a single-atom Fe catalyst for an efficient oxygen reduction reaction in high-power Zn–air cells

Back to tab navigation

Supplementary files

Publication details

The article was received on 30 May 2018, accepted on 10 Aug 2018 and first published on 13 Aug 2018


Article type: Paper
DOI: 10.1039/C8NR04372H
Citation: Nanoscale, 2018,10, 16145-16152
  •   Request permissions

    A rationally designed Fe-tetrapyridophenazine complex: a promising precursor to a single-atom Fe catalyst for an efficient oxygen reduction reaction in high-power Zn–air cells

    Z. K. Yang, C. Yuan and A. Xu, Nanoscale, 2018, 10, 16145
    DOI: 10.1039/C8NR04372H

Search articles by author

Spotlight

Advertisements