Details
| Original language | English |
|---|---|
| Pages (from-to) | 4477-4488 |
| Number of pages | 12 |
| Journal | ACS catalysis |
| Volume | 15 |
| Issue number | 6 |
| Early online date | 2 Mar 2025 |
| Publication status | Published - 21 Mar 2025 |
Abstract
High-temperature proton exchange membrane fuel cells (HT-PEMFCs) typically rely on platinum-based catalysts, which require high loadings due to Pt deactivation by phosphates from the phosphoric acid-doped membrane. As alternative catalysts for the oxygen reduction reaction, metal-nitrogen-carbons (M-N-Cs) are promising due to their high intrinsic activity and tolerance to phosphates. However, low volumetric activity compared to Pt nanoparticles on carbon blacks (Pt/C) and insufficient stability limit their applicability. In order to enhance the stability and activity of Fe-N-Cs, this study investigates the incorporation of tin as a second metal, resulting in Fe-Sn-N-Cs, prepared by a metal-organic framework (MOF)-based approach. Stable and highly active catalysts with total mass activities of 8.2 A g-1 (Fe-Sn-N-C (1:1)) and 19.3 A g-1 (Fe-Sn-N-C (1:0.3)) in 0.5 mol L-1 H3PO4, drastically exceeding those of the commercial Fe-N-C catalyst PMF-014401 (Pajarito-Powder, 4.8 A g-1), are obtained by a synthesis without the need for subsequent purification steps. A stress test under harsh conditions (0.6-1.0 VRHE, 10,000 cycles, O2-saturated electrolyte) ascertains stability-enhancing effects of tin, highlighting an increase in stability in conjunction with the tin content. These results provide a valuable contribution to the development of cost-effective HT-PEMFCs by significantly enhancing the catalytic activity of platinum group metal-free catalysts.
Keywords
- M-N-C, metal organic frameworks, multimetallic catalysts, non-PGM catalysts, oxygen reduction reaction, PEM fuel cells, rotating ring disc electrode
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- General Chemistry
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In: ACS catalysis, Vol. 15, No. 6, 21.03.2025, p. 4477-4488.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Fe-Sn-N-C Catalysts
T2 - Advancing Oxygen Reduction Reaction Performance
AU - Buschermöhle, Julia G.
AU - Müller-Hülstede, Julia
AU - Schmies, Henrike
AU - Schonvogel, Dana
AU - Zierdt, Tanja
AU - Lucka, Rene
AU - Renz, Franz
AU - Wagner, Peter
AU - Wark, Michael
N1 - Publisher Copyright: © 2025 The Authors. Published by American Chemical Society.
PY - 2025/3/21
Y1 - 2025/3/21
N2 - High-temperature proton exchange membrane fuel cells (HT-PEMFCs) typically rely on platinum-based catalysts, which require high loadings due to Pt deactivation by phosphates from the phosphoric acid-doped membrane. As alternative catalysts for the oxygen reduction reaction, metal-nitrogen-carbons (M-N-Cs) are promising due to their high intrinsic activity and tolerance to phosphates. However, low volumetric activity compared to Pt nanoparticles on carbon blacks (Pt/C) and insufficient stability limit their applicability. In order to enhance the stability and activity of Fe-N-Cs, this study investigates the incorporation of tin as a second metal, resulting in Fe-Sn-N-Cs, prepared by a metal-organic framework (MOF)-based approach. Stable and highly active catalysts with total mass activities of 8.2 A g-1 (Fe-Sn-N-C (1:1)) and 19.3 A g-1 (Fe-Sn-N-C (1:0.3)) in 0.5 mol L-1 H3PO4, drastically exceeding those of the commercial Fe-N-C catalyst PMF-014401 (Pajarito-Powder, 4.8 A g-1), are obtained by a synthesis without the need for subsequent purification steps. A stress test under harsh conditions (0.6-1.0 VRHE, 10,000 cycles, O2-saturated electrolyte) ascertains stability-enhancing effects of tin, highlighting an increase in stability in conjunction with the tin content. These results provide a valuable contribution to the development of cost-effective HT-PEMFCs by significantly enhancing the catalytic activity of platinum group metal-free catalysts.
AB - High-temperature proton exchange membrane fuel cells (HT-PEMFCs) typically rely on platinum-based catalysts, which require high loadings due to Pt deactivation by phosphates from the phosphoric acid-doped membrane. As alternative catalysts for the oxygen reduction reaction, metal-nitrogen-carbons (M-N-Cs) are promising due to their high intrinsic activity and tolerance to phosphates. However, low volumetric activity compared to Pt nanoparticles on carbon blacks (Pt/C) and insufficient stability limit their applicability. In order to enhance the stability and activity of Fe-N-Cs, this study investigates the incorporation of tin as a second metal, resulting in Fe-Sn-N-Cs, prepared by a metal-organic framework (MOF)-based approach. Stable and highly active catalysts with total mass activities of 8.2 A g-1 (Fe-Sn-N-C (1:1)) and 19.3 A g-1 (Fe-Sn-N-C (1:0.3)) in 0.5 mol L-1 H3PO4, drastically exceeding those of the commercial Fe-N-C catalyst PMF-014401 (Pajarito-Powder, 4.8 A g-1), are obtained by a synthesis without the need for subsequent purification steps. A stress test under harsh conditions (0.6-1.0 VRHE, 10,000 cycles, O2-saturated electrolyte) ascertains stability-enhancing effects of tin, highlighting an increase in stability in conjunction with the tin content. These results provide a valuable contribution to the development of cost-effective HT-PEMFCs by significantly enhancing the catalytic activity of platinum group metal-free catalysts.
KW - M-N-C
KW - metal organic frameworks
KW - multimetallic catalysts
KW - non-PGM catalysts
KW - oxygen reduction reaction
KW - PEM fuel cells
KW - rotating ring disc electrode
UR - http://www.scopus.com/inward/record.url?scp=85219477103&partnerID=8YFLogxK
U2 - 10.1021/acscatal.4c06338
DO - 10.1021/acscatal.4c06338
M3 - Article
AN - SCOPUS:85219477103
VL - 15
SP - 4477
EP - 4488
JO - ACS catalysis
JF - ACS catalysis
SN - 2155-5435
IS - 6
ER -