Spontaneous aerobic ageing of Fe–N–C materials and consequences on oxygen reduction reaction kinetics

Santos, Keyla Teixeira; Kumar, Kavita; Dubau, Laëtitia; Ge, Hongxin; Berthon‐Fabry, Sandrine; Vasconcellos, C.S.A.; Lima, Fabio H. B.; Asset, Tristan; Atanassov, Plamen; Saveleva, Viktoriia A.; Glatzel, Pieter; Li, X.; Jaouen, Frédéric; Maillard, Frédéric

doi:10.1016/j.jpowsour.2023.232829

Cited by 6 publications

(4 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly to what was recently shown by K.T. Santos et al 24 and Boldrin et al , 25 we reported the drop in ORR activity over time due to storage under atmospheric conditions of the catalyst powder and reactivation upon thermal treatment. Our study confirms their general findings specifically for tetrapyrrolic Fe–N 4 sites employing the very sensitive Mössbauer spectroscopy at cryogenic conditions ( T = 4.2 K).…”

Section: Resultssupporting

confidence: 90%

Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders

Menga,

Wagner,

Fellinger

2023

Mater. Horiz.

View full text Add to dashboard Cite

show abstract

Section: Resultssupporting

confidence: 90%

Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders

Menga,

Wagner,

Fellinger

2023

Mater. Horiz.

View full text Add to dashboard Cite

show abstract

“…The advantages of XANES-EXAFS are its applicability to in situ and operando measurements with fast acquisition time, and its applicability to numerous chemical elements . X-ray emission spectroscopy is a complementary analysis to XAS, which gives information on the average spin state of Fe and could be envisioned to track structural reorganization of Fe-N-C materials during ORR electrocatalysis. − …”

Section: Discussionmentioning

confidence: 99%

Review on the Degradation Mechanisms of Metal-N-C Catalysts for the Oxygen Reduction Reaction in Acid Electrolyte: Current Understanding and Mitigation Approaches

et al. 2023

Self Cite

View full text Add to dashboard Cite

One bottleneck hampering the widespread use of fuel cell vehicles, in particular of proton exchange membrane fuel cells (PEMFCs), is the high cost of the cathode where the oxygen reduction reaction (ORR) occurs, due to the current need of precious metals to catalyze this reaction. Electrochemists tackle this issue in the short/medium term by developing catalysts with improved utilization or efficiency of platinum, and in the longer term, by developing catalysts based on Earth-abundant elements. Considerable progress has been achieved in the initial performance of Metal-nitrogen-carbon (Metal-N-C) catalysts for the ORR, especially with Fe-N-C materials. However, until now, this high performance cannot be maintained for a sufficiently long time in an operating PEMFC. The identification and mitigation of the degradation mechanisms of Metal-N-C electrocatalysts in the acidic environment of PEMFCs has therefore become an important research topic. Here, we review recent advances in the understanding of the degradation mechanisms of Metal-N-C electrocatalysts, including the recently identified importance of combined oxygen and electrochemical potential. Results obtained in a liquid electrolyte and a PEMFC device are discussed, as well as insights gained from in situ and operando techniques. We also review the mitigation approaches that the scientific community has hitherto investigated to overcome the durability issues of Metal-N-C electrocatalysts.

show abstract

“…[48] X-ray emission spectroscopy serves as a supplementary method to XAS, offering insights into the mean spin state of Fe and enabling the monitoring of structural reorganization in FeÀ NÀ C materials throughout ORR electrocatalysis. [49][50][51][52] 57 Fe Moåssbauer spectroscopy has proven to be a unique tool for studying the oxidation state and chemical environment of Fe in FeÀ NÀ C catalysts. Recently, Mössbauer spectroscopy was combined with in situ (inert gas addition to the cathode) electrochemistry using anisole-rich 57 FeÀ NÀ C cathode.…”

Section: Microporous Floodingmentioning

confidence: 99%

Recent Progress on Durable Metal‐N‐C Catalysts for Proton Exchange Membrane Fuel Cells

Wu,

Chen,

et al. 2023

Chemistry An Asian Journal

View full text Add to dashboard Cite

It is essential for the widespread application of proton exchange membrane fuel cells (PEMFCs) to investigate low‐cost, extremely active, and long‐lasting oxygen reduction catalysts. Initial performance of PGM‐free metal‐nitrogen‐carbon (M‐N‐C) catalysts for oxygen reduction reaction (ORR) has advanced significantly, particularly for Fe‐N‐C‐based catalysts. However, the insufficient stability of M‐N‐C catalysts still impedes their use in practical fuel cells. In this review, we focus on the understanding of the structure‐stability relationship of M‐N‐C ORR catalysts and summarize valuable guidance for the rational design of durable M‐N‐C catalysts. In the first section of this review, we discuss the inherent degrading mechanisms of M‐N‐C catalysts, such as Carbon corrosion, demetallation, H2O2 attack, etc. As we gain a thorough comprehension of these deterioration mechanisms, we shift our attention to the investigation of strategies that can mitigate catalyst deterioration and increase its stability. These strategies include enhancing the anti‐oxidation of carbon, fortifying M‐N bonds, and maximizing the effectiveness of free radical scavengers. This review offers a prospective view on the enhancement of the stability of non‐noble metal catalysts.

show abstract

Spontaneous aerobic ageing of Fe–N–C materials and consequences on oxygen reduction reaction kinetics

Cited by 6 publications

References 42 publications

Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders

Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders

Review on the Degradation Mechanisms of Metal-N-C Catalysts for the Oxygen Reduction Reaction in Acid Electrolyte: Current Understanding and Mitigation Approaches

Recent Progress on Durable Metal‐N‐C Catalysts for Proton Exchange Membrane Fuel Cells

Contact Info

Product

Resources

About