Nitrogen-doped 3D porous carbons with iron carbide nanoparticles encapsulated in graphitic layers derived from functionalized MOF as an efficient noble-metal-free oxygen reduction electrocatalysts in both acidic and alkaline media

• Published in: RSC advances Vol. 6; no. 112; pp. 110820 - 110830
• Main Authors: Xue, Juanhong, Zhao, Ling, Dou, Zhiyu, Yang, Yan, Guan, Yue, Zhu, Zhen, Cui, Lili
• Format: Journal Article
• Language: English
• Published: 01.01.2016
• Subjects: Acid leaching; annealing; Carbon; catalysts; catalytic activity; coordination polymers; durability; electrochemistry; Graphene; graphene oxide; iron; Iron carbides; leaching; Media; methanol; Methyl alcohol; Nanoparticles; nitrogen content; Oxygen; pyrolysis; surface area; synergism; temperature
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/C6RA24299E

A novel kind of functionalized metal organic framework (F-MOF, Prussian blue/graphene oxide composite, PB/GO) is prepared by a simple method. The morphology characterization indicates that iron carbide nanoparticles supported on highly nitrogen-doped 3D porous carbons (Fe–C/NG) are formed after direct annealing of F-MOF under an Ar atmosphere. Fe–C/NG-10%-700-AL (10% represents the mass ratio between GO and iron salt; 700 stands for pyrolysis temperature; AL means acid leaching) exhibits excellent catalytic activity for the ORR (oxygen reduction reaction) in both acidic and alkaline media, together with superior durability, excellent methanol tolerance and a nearly four-electron pathway for the ORR. The excellent catalytic performance for the ORR on Fe–C/NG-10%-700-AL is attributed to the existence of iron carbide nanoparticles, highly doped N concentration, high surface area and pores of 3D graphene and the synergistic effect between multiple components.