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Fe-N-functionalized carbon electrocatalyst derived from zeolitic imidazolate framework for oxygen reduction: Fe and NH3 treatment effects

Abstract

Non-precious iron-nitrogen-functionalized carbon (Fe-N-C) electrocatalysts for oxygen reduction reaction (ORR) are prepared from ZIF-8 and iron acetylacetonate. The amount of Fe in the precursor mixture is varied to scrutinize the effect of Fe on structural and catalytic properties of resulting Fe-N-C. The electrocatalytic activity of the optimized sample in acidic electrolyte is comparable to that of commercial Tanaka Pt/C electrocatalyst. The catalyst was also assembled in a membrane electrode assembly as a cathode electrode for a single cell test, which shows remarkable fuel cell performance compared to other related studies of non-precious metal-based catalysts for ORR. Such high ORR catalytic performance can be ascribed to synergistic effect of Fe-N-C species, high density pyridinic N species, N-doped carbon-encapsulated iron carbide (NC-Fe3C) nanoparticles, and high electrical conductivity as well as the porous framework structure of the as-prepared ZIF-based Fe-N-C catalyst. In addition, different properties of catalysts prepared in nitrogen or ammonia (NH3) atmosphere are also investigated. Interestingly, it is found that NH3 treatment helps to not only improve carbon porosity and nitrogen content but also increase carbon graphitization and induce NC-Fe3C formation, leading to enhanced ORR activity and durability of thus-prepared catalysts.

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Publication details

The article was received on 03 Jun 2018, accepted on 10 Sep 2018 and first published on 10 Sep 2018


Article type: Paper
DOI: 10.1039/C8CY01140K
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Fe-N-functionalized carbon electrocatalyst derived from zeolitic imidazolate framework for oxygen reduction: Fe and NH3 treatment effects

    T. Tran, C. Shin, B. Lee, J. Samdani, J. Park, T. Kang and J. Yu, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY01140K

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