Operando Synchrotron Imaging of Electrolyte Distribution in Silver-Based Gas Diffusion Electrodes During Oxygen Reduction Reaction in Highly Alkaline Media

2021 ◽  
Author(s):  
Melanie Cornelia Paulisch ◽  
Marcus Gebhard ◽  
David Franzen ◽  
André Hilger ◽  
Markus Osenberg ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Gas Diffusion Electrodes ◽  
Synchrotron Imaging

Oxygen Reduction Reaction Causes Iron Leaching from Fe-N-C Electrocatalysts

2021 ◽  
Author(s):  
Yu-Ping Ku ◽  
Konrad Ehelebe ◽  
Markus Bierling ◽  
Florian Speck ◽  
Dominik Seeberger ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Inductively Coupled Plasma ◽  
Catalyst Layer ◽  
Platinum Group Metal ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Inductively Coupled ◽  
Design And Synthesis

Abstract The electrochemical activity of modern Fe-N-C electrocatalysts in alkaline media is on par with that of platinum. For successful application in fuel cells, however, also high durability and longevity must be demonstrated. Currently, design and synthesis of simultaneously active and stable platinum group metal-free electrocatalysts is hindered by a limited understanding of Fe-N-C degradation, especially under operando conditions. In this work, using a gas diffusion electrode half-cell coupled with inductively coupled plasma mass spectrometry setup, Fe dissolution is studied under more realistic conditions, i.e. real catalyst layer and current densities up to 125 mA·cm-2. Varying the rate of oxygen reduction reaction, we show a remarkable correlation between Faradaic electrode charge and Fe dissolution. This finding is rationalized assuming that oxygen reduction and Fe dissolution reactions are interlinked, likely through a common intermediate formed during the Fe3+/Fe2+ redox transitions in coordinated Fe cations. Moreover, such linear correlation allows an introduction and use of a simple metric (stability number). Hence, in the current work, a powerful tool for a more applied stability screening of different electrocatalysts is introduced, which allows on the one hand fast performance investigations under more realistic conditions, and on the other hand more advanced mechanistic understanding of Fe-N-C degradation in catalyst layers.

Development of silver-gas diffusion electrodes for the oxygen reduction reaction by electrodeposition

2013 ◽  
Vol 143 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Sónia Salomé ◽  
Rosa Rego ◽  
M. Cristina Oliveira
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Gas Diffusion Electrodes

scholarly journals Fuel cell catalyst layer evaluation using a gas diffusion electrode half-cell: Oxygen reduction reaction on Fe-N-C in alkaline media

2020 ◽  
Vol 116 ◽  
pp. 106761
Author(s):  
Konrad Ehelebe ◽  
Talal Ashraf ◽  
Simon Hager ◽  
Dominik Seeberger ◽  
Simon Thiele ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Catalyst Layer ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Gas Diffusion Electrode ◽  
Alkaline Media ◽  
Half Cell ◽  
Fuel Cell Catalyst

scholarly journals Spatially resolved model of oxygen reduction reaction in silver-based porous gas-diffusion electrodes based on operando measurements

2021 ◽  
Vol 375 ◽  
pp. 137976
Author(s):  
David Franzen ◽  
Melanie C. Paulisch ◽  
Barbara Ellendorff ◽  
Ingo Manke ◽  
Thomas Turek
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Gas Diffusion Electrodes ◽  
Spatially Resolved

Effect of carbon surface oxidation on platinum supported carbon particles on the performance of gas diffusion electrodes for the oxygen reduction reaction

2008 ◽  
Vol 38 (6) ◽  
pp. 869-874 ◽  
Author(s):  
Ahmad Nozad Golikand ◽  
Elaheh Lohrasbi ◽  
Mohammad Ghannadi Maragheh ◽  
Mehdi Asgari
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Surface Oxidation ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Carbon Surface ◽  
Gas Diffusion Electrodes ◽  
Carbon Particles

Carbon Paper-Supported NiCo/C–N Catalysts Synthesized by Directly Pyrolyzing NiCo-Doped Polyaniline for Oxygen Reduction Reaction

NANO ◽  
2018 ◽  
Vol 13 (01) ◽  
pp. 1850006 ◽  
Author(s):  
Zhongliang Deng ◽  
Qingfeng Yi ◽  
Yuanyuan Zhang ◽  
Huidong Nie ◽  
Guang Li ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Current Density ◽  
Electrocatalytic Activity ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Carbon Paper ◽  
Onset Potential ◽  
Doped Polyaniline

In this study, we report the findings that the C–N composites containing Ni and Co (Ni1Co1/C–N, Ni3Co1/C–N, Ni6Co1/C–N, Ni9Co1/C–N, Ni[Formula: see text]Co0/C–N and Ni0Co[Formula: see text]/C–N) can be produced by direct pyrolysis of the NiCo-doped polyaniline (PANI) precursors in N2 atmosphere at 800[Formula: see text]C and show efficient electroactivity for oxygen reduction reaction (ORR) in alkaline media. Distribution and compositions of the catalysts were characterized by SEM, TEM, EDS and XRD techniques. The catalysts were loaded on carbon paper to prepare gas diffusion electrodes, in which electrocatalytic activity for ORR in alkaline media was investigated by voltammetric techniques. The ORR current density on these carbon paper-supported NiCo/C–N catalysts exhibits a linear increase with the negative shift of ORR potential. The ORR onset potential is around [Formula: see text]0.2[Formula: see text]V (versus Ag/AgCl) in alkaline media. Among the prepared catalysts, the catalyst Ni6Co1/C–N presents the largest ORR current density, which is 68.5[Formula: see text]mA[Formula: see text]cm[Formula: see text]@[Formula: see text]0.8[Formula: see text]V (versus Ag/AgCl) in alkaline media. Moreover, Ni6Co1/C–N catalyst also presents good electrocatalytic activity stability for ORR.

Ultra-low loading Pt-sputtered gas diffusion electrodes for oxygen reduction reaction

2018 ◽  
Vol 48 (2) ◽  
pp. 221-232 ◽  
Author(s):  
Gustav Sievers ◽  
Tanja Vidakovic-Koch ◽  
Christian Walter ◽  
Florian Steffen ◽  
Sven Jakubith ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Gas Diffusion Electrodes

scholarly journals Insights on platinum-carbon catalyst degradation mechanism for oxygen reduction reaction in acidic and alkaline media

2021 ◽  
Vol 487 ◽  
pp. 229356
Author(s):  
Marc Francis Labata ◽  
Guangfu Li ◽  
Joey Ocon ◽  
Po-Ya Abel Chuang
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Degradation Mechanism ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Carbon Catalyst ◽  
Acidic And Alkaline Media

scholarly journals Superior FexN electrocatalyst derived from 1,1′-diacetylferrocene for oxygen reduction reaction in alkaline and acidic media

2020 ◽  
Vol 9 (1) ◽  
pp. 843-852
Author(s):  
Hunan Jiang ◽  
Jinyang Li ◽  
Mengni Liang ◽  
Hanpeng Deng ◽  
Zuowan Zhou
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Current Density ◽  
Active Sites ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Acidic Media ◽  
Onset Potential ◽  
Acidic And Alkaline Media ◽  
The Stability

AbstractAlthough Fe–N/C catalysts have received increasing attention in recent years for oxygen reduction reaction (ORR), it is still challenging to precisely control the active sites during the preparation. Herein, we report FexN@RGO catalysts with the size of 2–6 nm derived from the pyrolysis of graphene oxide and 1,1′-diacetylferrocene as C and Fe precursors under the NH3/Ar atmosphere as N source. The 1,1′-diacetylferrocene transforms to Fe3O4 at 600°C and transforms to Fe3N and Fe2N at 700°C and 800°C, respectively. The as-prepared FexN@RGO catalysts exhibited superior electrocatalytic activities in acidic and alkaline media compared with the commercial 10% Pt/C, in terms of electrochemical surface area, onset potential, half-wave potential, number of electrons transferred, kinetic current density, and exchange current density. In addition, the stability of FGN-8 also outperformed commercial 10% Pt/C after 10000 cycles, which demonstrates the as-prepared FexN@RGO as durable and active ORR catalysts in acidic media.

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