Pascal Theis
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View article: Reversibly Redox-Active Iron Oxide Structures in FeNC Catalysts Identified by Microscopy and Spectroelectrochemical EPR and Mössbauer Methods
Reversibly Redox-Active Iron Oxide Structures in FeNC Catalysts Identified by Microscopy and Spectroelectrochemical EPR and Mössbauer Methods Open
Identifying active sites in FeNC catalysts for oxygen reduction reactions (ORR) and active site changes during preparation, storage, and electrochemical cycling are key challenges in the quest for improved catalysts. In this work, high-res…
View article: The fate of FeNC catalysts: Influence of storage conditions on structure and performance evolution
The fate of FeNC catalysts: Influence of storage conditions on structure and performance evolution Open
FeNC materials are considered as promising catalysts for fuel cell application and CO2 reduction. However, a general obstacle is their instability when stored at ambient conditions, typically this resulted in structural changes and loss of…
View article: Reversibly Redox Active Iron Oxide Structures in FeNC Catalysts Identified by Microscopy and Spectroelectrochemical EPR and Mössbauer Spectroscopies
Reversibly Redox Active Iron Oxide Structures in FeNC Catalysts Identified by Microscopy and Spectroelectrochemical EPR and Mössbauer Spectroscopies Open
Identifying active sites in FeNC catalysts for oxygen reduction reactions (ORR) and their alteration during preparation, storage, and electrochemical cycling are key challenges in the quest for improved catalysts. In this work, high-resolu…
View article: Revealing the dynamic changes of FeNC during CO$_2$RR: An integrated approach
Revealing the dynamic changes of FeNC during CO$_2$RR: An integrated approach Open
We explored the electrochemical behaviour of an iron-nitrogen-carbon catalyst in the electrochemical CO$_2$ reduction reaction (CO$_2$RR). The catalyst was prepared by pyrolysis from carbon-supported iron porphyrin to ensure a high concent…
View article: Fe–N–C Electrocatalyst and Its Electrode: Are We Talking about the Same Material?
Fe–N–C Electrocatalyst and Its Electrode: Are We Talking about the Same Material? Open
Evaluation of the electrocatalyst performance data includes\nan\nelectrode preparation step. Herein, we compare the structural composition\nof Fe–N–C materials, used to electrocatalyze the oxygen\nreduction reaction in proton-exchange memb…
View article: Oxygen reduction reaction on FeNC catalysts- Identifying the contribution of iron environments to the direct and indirect reaction pathway
Oxygen reduction reaction on FeNC catalysts- Identifying the contribution of iron environments to the direct and indirect reaction pathway Open
FeNC catalysts are promising catalysts for the oxygen reduction reaction (ORR) in fuel cells while their stability need to be improved. Due to their heterogeneous composition, it is difficult to discriminate the contribution of the various…
View article: In situ 57Fe mössbauer study of a porphyrin based FeNC catalyst for ORR
In situ 57Fe mössbauer study of a porphyrin based FeNC catalyst for ORR Open
FeNC catalysts are important substitutes for the oxygen reduction reaction (ORR) in fuel cells. This work reports on an in situ Mössbauer spectroelectrochemical study of a porphyrin-based catalyst. Activity and selectivity towards ORR were…
View article: Active Site Identification in FeNC Catalysts and Their Assignment to the Oxygen Reduction Reaction Pathway by In Situ <sup>57</sup>Fe Mössbauer Spectroscopy
Active Site Identification in FeNC Catalysts and Their Assignment to the Oxygen Reduction Reaction Pathway by In Situ <sup>57</sup>Fe Mössbauer Spectroscopy Open
FeNC catalysts are the most promising substitutes for Pt‐based catalysts for the oxygen reduction reaction in proton exchange fuel cells. However, it remains unclear which FeN 4 moieties contribute to the reaction mechanism and in which wa…
View article: dataAvailable.zip from Systematic study of precursor effects on structure and oxygen reduction reaction activity of FeNC catalysts
dataAvailable.zip from Systematic study of precursor effects on structure and oxygen reduction reaction activity of FeNC catalysts Open
In this work, the effect of porphyrin loading and template size is varied systematically to study its impact on the oxygen reduction reaction (ORR) activity as followed by rotating ring disc electrode experiments in both acidic and alkalin…