Bimetallic porous porphyrin polymer-derived non-precious metal electrocatalysts for oxygen reduction reactions

Brueller S, Liang HW, Kramm UI, Krumpfer JW, Feng X, Muellen K (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Journal of Materials Chemistry A Royal Society of Chemistry

Book Volume: 3

Pages Range: 23799-23808

Journal Issue: 47

DOI: 10.1039/c5ta06309d

Abstract

The development of efficient and stable electrocatalysts on the basis of non-precious metals (Co, Fe) is considered as one of the most promising routes to replace expensive and susceptible platinum as the oxygen reduction reaction (ORR) catalyst. Here we report a synthetic strategy for the precursor controlled, template-free preparation of novel mono- (Fe; Co) and bimetallic (Fe/Co) nitrogen-doped porous carbons and their electrocatalytic performance towards the ORR. The precursors are composed of metal-porphyrin based conjugated microporous polymers (M-CMPs with M = Fe; Co; Fe/Co) derived from polymerization of metalloporphyrins by the Suzuki polycondensation reaction, which enables the synthesis of bimetallic polymers with alternating metal-porphyrin units for the preparation of carbon-based catalysts with homogenously distributed CoN4 and FeN4 centres. Subsequent pyrolysis of the networks reveals the key role of pre-morphology and network composition on the active sites. 57Fe-Mössbauer spectroscopy was conducted on iron catalysts (Fe; Fe/Co) to determine the coordination of Fe within the N-doped carbon matrix and the catalytic activity-enhancing shift in electron density. In acidic media the bimetallic catalyst demonstrates a synergetic effect for cobalt and iron active sites, mainly through a 4-electron transfer process, achieving an onset potential of 0.88 V (versus a reversible hydrogen electrode) and a half-wave potential of 0.78 V, which is only 0.06 V less than that of the state-of-the-art Pt/C catalyst.

Involved external institutions

Max-Planck-Institut für Polymerforschung (MPI-P) / Max Planck Institute for Polymer Research DE Germany (DE) Technische Universität Darmstadt DE Germany (DE) Technische Universität Dresden DE Germany (DE)

How to cite

APA:

Brueller, S., Liang, H.-W., Kramm, U.I., Krumpfer, J.W., Feng, X., & Muellen, K. (2015). Bimetallic porous porphyrin polymer-derived non-precious metal electrocatalysts for oxygen reduction reactions. Journal of Materials Chemistry A, 3(47), 23799-23808. https://doi.org/10.1039/c5ta06309d

MLA:

Brueller, Sebastian, et al. "Bimetallic porous porphyrin polymer-derived non-precious metal electrocatalysts for oxygen reduction reactions." Journal of Materials Chemistry A 3.47 (2015): 23799-23808.

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