Promotion of oxygen reduction performance by Fe3O4 nanoparticles support nitrogen-doped three dimensional meso/macroporous carbon based electrocatalyst

• Published in: International journal of hydrogen energy Vol. 42; no. 7; pp. 4133 - 4145
• Main Authors: Li, Guang-Lan, Liu, Cai-Di, Chen, Si-Mei, Hao, Ce, Cheng, Guang-Chun, Xie, Yang-Yang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 16.02.2017
• Subjects: Fe3O4 nanoparticles; Meso/macropores; Oxygen reduction reaction; Three dimensional structure; Three dimensional structure; Meso/macropores; Oxygen reduction reaction; Fe3O4 nanoparticles
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2016.10.081

Exploring low-cost and high-performance nonprecious metal catalysts for oxygen reduction reaction (ORR) in fuel cells is crucial for the commercialization of energy conversion and storage devices. Here we report a three-dimensional hierarchical porous Fe, N doped carbon catalysts synthesized by a facile pyrolysis method using silica nanospheres as template, glucose, FeSO4·7H2O and dicyandiamide as the carbon, iron and nitrogen precursors, respectively. The corresponding 3DHP/Fe-N-C-900 catalyst exhibits superior ORR activity with the onset potential of 0 V (vs. Ag/AgCl) and long-term stability than that of 20 wt. % Pt/C in alkaline medium. The excellent ORR performance of 3DHP/Fe-N-C-900 can be attributed to the synergistic effect of Fe3O4 and doped N, as well as the three-dimensional meso/macroporous structure with high surface area. The finding of high ORR activity of Fe3O4 nanoparticles coupling with hierarchical porous N-doped carbon materials opens a new avenue for the construction of cost-effective Fe-N-C catalysts for fuel cells. [Display omitted] •The 3DHP/Fe-N-C-900 catalyst possesses high specific surface area.•The iron species only forms Fe3O4 rather than FeNx in 3DHP/Fe-N-C-900.•The 3DHP/Fe-N-C-900 catalyst exhibits excellent catalytic activity for ORR.•The 3DHP/Fe-N-C-900 catalyst displays superior long-term stability.•Such high ORR performance mainly results from the synergistic effect of Fe3O4 nanoparticles and doped N.