Fe-Sn-N-C Catalysts: Advancing Oxygen Reduction Reaction Performance

被引:0
作者
Buschermoehle, Julia G. [1 ,2 ]
Mueller-Huelstede, Julia [1 ]
Schmies, Henrike [1 ]
Schonvogel, Dana [1 ]
Zierdt, Tanja [1 ]
Lucka, Rene [3 ]
Renz, Franz [3 ]
Wagner, Peter [1 ]
Wark, Michael [2 ]
机构
[1] German Aerosp Ctr DLR, Inst Engn Thermodynam, D-26129 Oldenburg, Germany
[2] Carl von Ossietzky Univ Oldenburg, Inst Chem, D-26129 Oldenburg, Germany
[3] Leibniz Univ Hannover, Inst Inorgan Chem, D-30167 Hannover, Germany
来源
ACS CATALYSIS | 2025年 / 15卷 / 06期
关键词
PEM fuel cells; oxygen reduction reaction; non-PGM catalysts; metal organic frameworks; multimetalliccatalysts; M-N-C; rotating ring discelectrode; NITROGEN-CARBON CATALYSTS; DUAL-METAL SITES; PEM FUEL-CELLS; FE/N/C-CATALYSTS; DOPED CARBON; STABILITY; POLYANILINE; ADSORPTION; DESIGN; ORR;
D O I
10.1021/acscatal.4c06338
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:4477 / 4488
页数:12
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