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In Situ Growth of Nitrogen-Doped Carbon-Coated γ-Fe₂O₃ Nanoparticles on Carbon Fabric for Electrochemical N₂ Fixation

Author:
Li, Yan, Kong, Yan, Hou, Yang, Yang, Bin, Li, Zhongjian, Lei, Lecheng, Wen, Zhenhai
Source:
ACS sustainable chemistry & engineering 2019 v.7 no.9 pp. 8853-8859
ISSN:
2168-0485
Subject:
ammonia, carbon, catalysts, catalytic activity, cations, electrochemistry, electrodes, fabrics, ferric oxide, nanoparticles, nitrogen, nitrogen fixation
Abstract:
Although electrocatalytic N₂ fixation has been regarded as a promising alternative strategy to the current Haber–Bosch technique for ammonia synthesis, it still remains a great challenge to develop low-cost and high-efficiency electrocatalysts with high catalytic activity and good selectivity. Here, we report the fabrication of a free-standing 3D hybrid electrode by in situ growth of N-doped carbon-coated γ-Fe₂O₃ nanoparticles supported on carbon fabric (γ-Fe₂O₃-NC/CF), which manifests a high Faradaic efficiency (FE) of 12.28% and a considerable ammonia yield of 11.7 × 10–¹⁰ mo1 s–¹ cm–². Systematic characterization coupled with comprehensive electrochemical studies imply that the cation vacancies on the surface of γ-Fe₂O₃-NC/CF generated during the electrochemical activation process majorly contribute to the enhanced electrocatalytic activity for the nitrogen reduction reaction (NRR).
Agid:
6422651