Halogens as Positive Electrode Active Species for Flow Batteries and Regenerative Fuel Cells

2020 ◽  
Vol 3 (3) ◽  
pp. 431-465 ◽  
Author(s):  
Alexander Jameson ◽  
Elod Gyenge
Keyword(s):  
Fuel Cells ◽  
Active Species ◽  
Positive Electrode ◽  
Flow Batteries

scholarly journals High-power positive electrode based on synergistic effect of N- and WO3 -decorated carbon felt for vanadium redox flow batteries

Carbon ◽  
2018 ◽  
Vol 136 ◽  
pp. 444-453 ◽  
Author(s):  
Mir Ghasem Hosseini ◽  
Seyedabolfazl Mousavihashemi ◽  
Sebastián Murcia-López ◽  
Cristina Flox ◽  
Teresa Andreu ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
High Power ◽  
Positive Electrode ◽  
Carbon Felt ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

Fuel Cells and Flow Batteries: A Comparative Process and Design Analysis

2014 ◽  
Vol 56 (1) ◽  
pp. 49-60
Author(s):  
W. Winkler ◽  
M. C. Williams
Keyword(s):  
Fuel Cells ◽  
Design Analysis ◽  
Flow Batteries

Solving the Conundrum of Active Site Density of PGM-free ORR Catalysts in situ Fuel Cells Using Fourier Transform Alternating Current Voltammetry

2021 ◽  
Author(s):  
Rifael Snitkoff ◽  
Ariel Friedman ◽  
Yan Yurko ◽  
Piotr Zelenay ◽  
Alan Bond ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Active Site ◽  
Alternating Current ◽  
Reduction Reaction ◽  
Active Species ◽  
Site Density ◽  
Alternating Current Voltammetry ◽  
Commercial Applications ◽  
First Time

Abstract Advances in the development of Pt-group metal-free (PGM-free) catalysts for oxygen reduction reaction in fuel cells produced active catalysts that allow to reduce the performance gap to the incumbent Pt-based materials. However, the utilization of the state-of-the-art PGM-free catalysts in commercial applications is currently impeded by their relatively low durability. Methods designed to study catalyst degradation in operating fuel cells are critical for the understanding and ultimately solving the durability issues. This work is the first report on the use of Fourier-transformed alternating current voltammetry (FTacV) as an electrochemical method for accurately quantifying the electrochemical site density of PGM-free ORR catalysts, and following their degradation during the operation of polymer electrolyte fuel cells. Using this method we were capable of detecting changes in performance of electrochemically active species (electrocatalytic centers in this case), allowing us, for the first time, to calculate the electrochemical active site density (EASD) which is necessary for the elucidation of the degradation mechanisms of PGM-free ORR catalysts in situ fuel cells.

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