Synthesis of Ordered Mesoporous Fe-N-C-PANI Catalyst via Self-assembly and Its Oxygen Reduction Reaction Activity in Acid Medium

doi:10.7503/cjcu20160941

Abstract

Abstract:

Highly ordered mesoporous Fe-N-C-PANI electrocatalysts were synthesized by ethanol evaporation induced self-assembly using triblock copolymer Pluronic F127 as template, phenol-formaldehyde resin as carbon precursor and polyaniline as the N precursor. XRD, TEM, BET, XPS and RDE techniques were used to characterize the composition, morphology and electrocatalytic activity of the catalysts. The results show that the catalyst pyrolyzed at 800℃ has distinctly ordered mesoporous structure and straightest channel, and its speci-fic surface area is as high as 1007 m²/g. The results of XPS show that the percentage of pyidinic N and Graphitic N of Fe-N-C-PANI-800 is 3.86%(molar fraction). In the process of heat treatment, Fe(Ⅲ) was reduced to metallic Fe, and the introduction of N was facilitated, which made iron carbide turn into Fe-N_x active sites, and enhanced the ORR catalytic performance of catalysts. But when the temperature rise to 900℃, the formation of metallic Fe decreases its ORR activity. In the acid medium, Fe-N-C-PANI-800 has an onset potential of 0.89 V(vs. RHE) and a half-wave potential of 0.81 V(vs. RHE). Ordered mesoporous catalyst had higher graphitization structure, which improved its stability.

Key words: Proton exchange membrane fuel cell, Non-noble metal electrocatalyst, Ordered mesoporous, Oxygen reduction reaction(ORR)

CLC Number:

O643

TrendMD:

KANG Huan, LI Shang, LIU Chang, GUO Wei, PAN Mu. Synthesis of Ordered Mesoporous Fe-N-C-PANI Catalyst via Self-assembly and Its Oxygen Reduction Reaction Activity in Acid Medium[J]. Chem. J. Chinese Universities, 2017, 38(8): 1423.

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