Jump to main content
Jump to site search

Issue 43, 2018
Previous Article Next Article

Tailoring the nano heterointerface of hematite/magnetite on hierarchical nitrogen-doped carbon nanocages for superb oxygen reduction

Author affiliations

Abstract

Nowadays the main challenge for large-scale applications of fuel cells is the designing of cheap and stable electrocatalysts for the oxygen reduction reaction (ORR). Herein, we report a convenient approach to a highly active cheap ORR electrocatalyst by tailoring the nano heterointerface of α-Fe2O3/Fe3O4 on hierarchical nitrogen-doped carbon nanocages (hNCNC) via the partial carbothermal reduction of α-Fe2O3 nanocrystals to Fe3O4. The so-constructed heterostructural α-Fe2O3/Fe3O4/hNCNC electrocatalyst exhibits excellent ORR performance surpassing commercial Pt/C, with a high onset potential (1.03 V vs. reversible hydrogen electrode) and half-wave potential (0.838 V), large limiting current density (6.02 mA cm−2 at 0.5 V), and robust durability and methanol tolerance. The heterostructure is identified by high-angle annular dark field scanning transmission electron microscopy coupled with electron energy-loss spectroscopy. Acid leaching experiments and theoretical calculations indicate that the heterostructural α-Fe2O3/Fe3O4 species with variable Fe valences are responsible for the high ORR performance. In principle, regulating the nano heterointerface based on the multivalent metal species in a nanocrystal matrix could become a new convenient approach to developing high-performance electrocatalysts or even various functional materials.

Graphical abstract: Tailoring the nano heterointerface of hematite/magnetite on hierarchical nitrogen-doped carbon nanocages for superb oxygen reduction

Back to tab navigation

Supplementary files

Publication details

The article was received on 05 Jul 2018, accepted on 08 Aug 2018 and first published on 13 Aug 2018


Article type: Paper
DOI: 10.1039/C8TA06442C
J. Mater. Chem. A, 2018,6, 21313-21319

  •   Request permissions

    Tailoring the nano heterointerface of hematite/magnetite on hierarchical nitrogen-doped carbon nanocages for superb oxygen reduction

    H. Fan, K. Mao, M. Liu, O. Zhuo, J. Zhao, T. Sun, Y. Jiang, X. Du, X. Zhang, Q. Wu, R. Che, L. Yang, Q. Wu, X. Wang and Z. Hu, J. Mater. Chem. A, 2018, 6, 21313
    DOI: 10.1039/C8TA06442C

Search articles by author

Spotlight

Advertisements