Non-PGM electrocatalysts for PEM fuel cells: effect of fluorination on the activity and stability of a highly active NC_Ar + NH3 catalyst

2019 ◽  
Vol 12 (10) ◽  
pp. 3015-3037 ◽  
Author(s):  
Gaixia Zhang ◽  
Xiaohua Yang ◽  
Marc Dubois ◽  
Michael Herraiz ◽  
Régis Chenitz ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Pem Fuel Cells ◽  
Highly Active

F2-Fluorination of Fe/N/C catalysts poisons FeN4, but not CNx sites. Main causes of instability in PEMFCs are either FeN4 demetalation for Fe/N/C or H2O2 when FeN4 sites are poisoned by fluorination or absent as in MOF_CNx_Ar + NH3.

Reply to the ‘Comment on “Non-PGM electrocatalysts for PEM fuel cells: effect of fluorination on the activity and stability of a highly active NC_Ar + NH3 catalyst”’ by Xi Yin, Edward F. Holby and Piotr Zelenay, Energy Environ. Sci., 10.1039/D0EE02069A

2021 ◽  
Vol 14 (2) ◽  
pp. 1034-1041
Author(s):  
Jean-Pol Dodelet ◽  
Vassili Glibin ◽  
Gaixia Zhang ◽  
Ulrike I. Kramm ◽  
Régis Chenitz ◽  
...  
Keyword(s):  
Fuel Cells ◽  
High Performance ◽  
Pem Fuel Cells ◽  
Fast Decay ◽  
Highly Active ◽  
Energy Environ

The fast decay in PEM fuel cells of a highly active, high performance, but unstable Fe/N/C catalyst like our NC_Ar + NH3 follows a chemical, not an electrochemical, demetallation mechanism for its ORR active FeN4 sites in the catalyst micropores.

A specific demetalation of Fe–N4 catalytic sites in the micropores of NC_Ar + NH3 is at the origin of the initial activity loss of the highly active Fe/N/C catalyst used for the reduction of oxygen in PEM fuel cells

2018 ◽  
Vol 11 (2) ◽  
pp. 365-382 ◽  
Author(s):  
Régis Chenitz ◽  
Ulrike I. Kramm ◽  
Michel Lefèvre ◽  
Vassili Glibin ◽  
Gaixia Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Fuel Cells ◽  
Pem Fuel Cells ◽  
Initial Activity ◽  
Performance Loss ◽  
Highly Active ◽  
Catalytic Sites ◽  
Activity Loss

Micropores are largely responsible for Fe/N/C catalytic activity, but are also intrinsically responsible for the rapid initial performance loss in PEMFC.

scholarly journals In-situ TEM and Atomic-Resolution STEM Study of Highly Active Partially Ordered Cu3Pt Nanoparticles used as PEM-Fuel Cells Catalyst

2014 ◽  
Vol 20 (S3) ◽  
pp. 476-477
Author(s):  
Goran Dražić ◽  
Marjan Bele ◽  
Andraž Pavlišič ◽  
Primož Jovanovič ◽  
Milena Zorko ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Pem Fuel Cells ◽  
Atomic Resolution ◽  
In Situ Tem ◽  
Partially Ordered ◽  
Highly Active

Highly Active Carbon Composite Electrocatalysts for PEM Fuel Cells

2019 ◽  
Vol 11 (1) ◽  
pp. 241-247 ◽  
Author(s):  
Vijayadurga Nallathambi ◽  
Gang Wu ◽  
Nalini Subramanian ◽  
Swaminatha Kumaraguru ◽  
Jong-Won Lee ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Active Carbon ◽  
Pem Fuel Cells ◽  
Carbon Composite ◽  
Highly Active
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