Understanding the electrocatalytic activity of transition metal nanoparticles for solid oxide cell fuel electrodes

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Abstract

In this work, we utilized the concept of decoupling the electrocatalytic activity from the current conducting phase of solid oxide cell fuel electrodes to investigate the electrochemical performance of three different transition metals, namely Ni, Co, and Fe. It was found that the nickel and cobalt infiltrated cells had comparable performances in both 4% H2O/H2 and 50% H2O/H2. Furthermore, iron nanoparticles were found to be the better electrocatalyst at low pO2 values, however at higher pO2 values the iron infiltration became the inferior catalyst. Investigating the temperature dependence of the polarization resistance in terms of activation energy and pre-exponential factor showed interesting differences between the metal catalysts and a dependence on the gas atmosphere. The results were analyzed by developing a model based on the harmonic oscillator, the model allows for correlating changes in activation energy and pre-exponential factor with kinetic parameters of the electrode reaction. The model indicates that at higher pO2 values, iron nanoparticles experience a surface blockade, i.e. strong bonding of the reactants to the catalytic sites. For the nickel electrocatalyst, an increase in steam content according to the model leads to an increase in the turnover frequency, which is in good agreement with earlier reports in literature.
Original languageEnglish
Article number135004
JournalElectrochimica Acta
Volume327
Number of pages9
ISSN0013-4686
DOIs
Publication statusPublished - 2019

Keywords

  • Solid oxide cells
  • Infiltration
  • Electrocatalytic activity
  • Model for adsorption of species
  • Nanoparticles
  • Fuel electrodes

Cite this

@article{e37b8952d3bc441db9e6daa083c54aae,
title = "Understanding the electrocatalytic activity of transition metal nanoparticles for solid oxide cell fuel electrodes",
abstract = "In this work, we utilized the concept of decoupling the electrocatalytic activity from the current conducting phase of solid oxide cell fuel electrodes to investigate the electrochemical performance of three different transition metals, namely Ni, Co, and Fe. It was found that the nickel and cobalt infiltrated cells had comparable performances in both 4{\%} H2O/H2 and 50{\%} H2O/H2. Furthermore, iron nanoparticles were found to be the better electrocatalyst at low pO2 values, however at higher pO2 values the iron infiltration became the inferior catalyst. Investigating the temperature dependence of the polarization resistance in terms of activation energy and pre-exponential factor showed interesting differences between the metal catalysts and a dependence on the gas atmosphere. The results were analyzed by developing a model based on the harmonic oscillator, the model allows for correlating changes in activation energy and pre-exponential factor with kinetic parameters of the electrode reaction. The model indicates that at higher pO2 values, iron nanoparticles experience a surface blockade, i.e. strong bonding of the reactants to the catalytic sites. For the nickel electrocatalyst, an increase in steam content according to the model leads to an increase in the turnover frequency, which is in good agreement with earlier reports in literature.",
keywords = "Solid oxide cells, Infiltration, Electrocatalytic activity, Model for adsorption of species, Nanoparticles, Fuel electrodes",
author = "Drasb{\ae}k, {Daniel B.} and Traulsen, {Marie L.} and Sudireddy, {Bhaskar R.} and Peter Holtappels",
year = "2019",
doi = "10.1016/j.electacta.2019.135004",
language = "English",
volume = "327",
journal = "Electrochimica Acta",
issn = "0013-4686",
publisher = "Pergamon Press",

}

TY - JOUR

T1 - Understanding the electrocatalytic activity of transition metal nanoparticles for solid oxide cell fuel electrodes

AU - Drasbæk, Daniel B.

AU - Traulsen, Marie L.

AU - Sudireddy, Bhaskar R.

AU - Holtappels, Peter

PY - 2019

Y1 - 2019

N2 - In this work, we utilized the concept of decoupling the electrocatalytic activity from the current conducting phase of solid oxide cell fuel electrodes to investigate the electrochemical performance of three different transition metals, namely Ni, Co, and Fe. It was found that the nickel and cobalt infiltrated cells had comparable performances in both 4% H2O/H2 and 50% H2O/H2. Furthermore, iron nanoparticles were found to be the better electrocatalyst at low pO2 values, however at higher pO2 values the iron infiltration became the inferior catalyst. Investigating the temperature dependence of the polarization resistance in terms of activation energy and pre-exponential factor showed interesting differences between the metal catalysts and a dependence on the gas atmosphere. The results were analyzed by developing a model based on the harmonic oscillator, the model allows for correlating changes in activation energy and pre-exponential factor with kinetic parameters of the electrode reaction. The model indicates that at higher pO2 values, iron nanoparticles experience a surface blockade, i.e. strong bonding of the reactants to the catalytic sites. For the nickel electrocatalyst, an increase in steam content according to the model leads to an increase in the turnover frequency, which is in good agreement with earlier reports in literature.

AB - In this work, we utilized the concept of decoupling the electrocatalytic activity from the current conducting phase of solid oxide cell fuel electrodes to investigate the electrochemical performance of three different transition metals, namely Ni, Co, and Fe. It was found that the nickel and cobalt infiltrated cells had comparable performances in both 4% H2O/H2 and 50% H2O/H2. Furthermore, iron nanoparticles were found to be the better electrocatalyst at low pO2 values, however at higher pO2 values the iron infiltration became the inferior catalyst. Investigating the temperature dependence of the polarization resistance in terms of activation energy and pre-exponential factor showed interesting differences between the metal catalysts and a dependence on the gas atmosphere. The results were analyzed by developing a model based on the harmonic oscillator, the model allows for correlating changes in activation energy and pre-exponential factor with kinetic parameters of the electrode reaction. The model indicates that at higher pO2 values, iron nanoparticles experience a surface blockade, i.e. strong bonding of the reactants to the catalytic sites. For the nickel electrocatalyst, an increase in steam content according to the model leads to an increase in the turnover frequency, which is in good agreement with earlier reports in literature.

KW - Solid oxide cells

KW - Infiltration

KW - Electrocatalytic activity

KW - Model for adsorption of species

KW - Nanoparticles

KW - Fuel electrodes

U2 - 10.1016/j.electacta.2019.135004

DO - 10.1016/j.electacta.2019.135004

M3 - Journal article

VL - 327

JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

M1 - 135004

ER -