Abstract
| Original language | English |
|---|---|
| Journal | Applied Catalysis B: Environmental |
| Volume | 234 |
| Pages (from-to) | 357-364 |
| ISSN | 0926-3373 |
| DOIs | |
| Publication status | Published - 2018 |
Keywords
- Oxygen reduction
- Catalyst
- Fuell cell
- Anion
- Poison
Cite this
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Immunity of the Fe-N-C catalysts to electrolyte adsorption: phosphate but not perchloric anions. / Hu, Yang; Jensen, Jens Oluf; Pan, Chao; Cleemann, Lars Nilausen; Shypunov, Illia; Li, Qingfeng.
In: Applied Catalysis B: Environmental, Vol. 234, 2018, p. 357-364.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - Immunity of the Fe-N-C catalysts to electrolyte adsorption: phosphate but not perchloric anions
AU - Hu, Yang
AU - Jensen, Jens Oluf
AU - Pan, Chao
AU - Cleemann, Lars Nilausen
AU - Shypunov, Illia
AU - Li, Qingfeng
PY - 2018
Y1 - 2018
N2 - Non-precious metal catalysts (NPMCs), particularly the type based on carbon-supported FeNx functionalities (Fe-N-C) are a very promising material for replacing the rare and costly platinum-based catalysts in polymer electrolyte membrane fuel cells (PEMFCs). Evaluation of these materials is most often carried out, like for Pt-based catalysts, in dilute perchloric acid by assuming its non-adsorbing nature on the active sites. The assumption is however not true. In this work, a typical Fe-N-C catalyst was first synthesized by high-pressure pyrolysis in the presence of carbon support and thoroughly characterized in terms of morphology, structure and active site distribution. The subsequent electrochemical characterization of the catalyst shows strong adsorption and poisoning effect of, in addition to the known Cl-, perchloric anions on the oxygen reduction reaction (ORR) activity. On the contrary phosphate anions exhibit negligible poisoning effect on the catalyst activity. At 0.8 V vs. RHE, the ORR activity of the catalyst is found to decrease in the order of H3PO4 (8.6 mA mg-1) > H2SO4 (5.3 mA mg-1 ) > HClO4 (3.1 mA mg-1) > HCl (0.7 mA mg-1). The results suggest potential applications of NPMC in high-temperature PEMFCs based on phosphoric acid doped polymer membranes, where high loading platinum catalysts are currently used. As demonstrated in the low current density range of high-temperature PEMFCs, the catalyst shows a comparable performance to the Pt/C catalysts.
AB - Non-precious metal catalysts (NPMCs), particularly the type based on carbon-supported FeNx functionalities (Fe-N-C) are a very promising material for replacing the rare and costly platinum-based catalysts in polymer electrolyte membrane fuel cells (PEMFCs). Evaluation of these materials is most often carried out, like for Pt-based catalysts, in dilute perchloric acid by assuming its non-adsorbing nature on the active sites. The assumption is however not true. In this work, a typical Fe-N-C catalyst was first synthesized by high-pressure pyrolysis in the presence of carbon support and thoroughly characterized in terms of morphology, structure and active site distribution. The subsequent electrochemical characterization of the catalyst shows strong adsorption and poisoning effect of, in addition to the known Cl-, perchloric anions on the oxygen reduction reaction (ORR) activity. On the contrary phosphate anions exhibit negligible poisoning effect on the catalyst activity. At 0.8 V vs. RHE, the ORR activity of the catalyst is found to decrease in the order of H3PO4 (8.6 mA mg-1) > H2SO4 (5.3 mA mg-1 ) > HClO4 (3.1 mA mg-1) > HCl (0.7 mA mg-1). The results suggest potential applications of NPMC in high-temperature PEMFCs based on phosphoric acid doped polymer membranes, where high loading platinum catalysts are currently used. As demonstrated in the low current density range of high-temperature PEMFCs, the catalyst shows a comparable performance to the Pt/C catalysts.
KW - Oxygen reduction
KW - Catalyst
KW - Fuell cell
KW - Anion
KW - Poison
U2 - 10.1016/j.apcatb.2018.03.056
DO - 10.1016/j.apcatb.2018.03.056
M3 - Journal article
VL - 234
SP - 357
EP - 364
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
SN - 0926-3373
ER -