Kinetics of oxidation of H2 and reduction of H2O in Ni-YSZ based solid oxide cells

Sune Dalgaard Ebbesen; Mogens Bjerg Mogensen

doi:10.1149/05049.0167ecst

Kinetics of oxidation of H₂ and reduction of H₂O in Ni-YSZ based solid oxide cells

Sune Dalgaard Ebbesen, Mogens Bjerg Mogensen

Department of Energy Conversion and Storage

Research output: Contribution to journal › Conference article › Research › peer-review

Abstract

Reduction of H2O and oxidation of H2 was studied in a Ni-YSZ electrode supported Solid Oxide Cells produced at DTU Energy conversion (former Risø DTU). Polarisation (i-V) and electrochemical impedance spectroscopic characterisation show that the kinetics for reduction of H 2O is slower compared to oxidation of H2. The kinetic differences cannot be explained by the reaction mechanisms which are similar in the two cases but are rather an effect of the thermodynamics. The preliminary analysis performed in this study show that the slow kinetic for reduction is partly related to the endothermic nature of the reaction, cooling the active electrode, thereby leading to slower kinetics at low current densities. Likewise, the increased kinetic for oxidation was found to be related to the exothermic nature of the reaction, heating the active electrode, and thereby leading to faster kinetics. At higher current densities an increase caused by diffusion becomes more pronounced. © The Electrochemical Society.

Original language	English
Journal	E C S Transactions
Volume	50
Issue number	49
Pages (from-to)	167-182
ISSN	1938-5862
DOIs	https://doi.org/10.1149/05049.0167ecst
Publication status	Published - 2012
Event	Pacific Rim Meeting on Electrochemical and Solid-State Science: 222nd Meeting of ECS — The Electrochemical Society and 2012 Fall Meeting of The Electrochemical Society of Japan - Hawaii Convention Center and the Hilton Hawaiian Village, Honolulu, United States Duration: 7 Oct 2012 → 12 Oct 2012 http://www.electrochem.org/meetings/biannual/222/222.htm

Conference

Conference	Pacific Rim Meeting on Electrochemical and Solid-State Science
Location	Hawaii Convention Center and the Hilton Hawaiian Village
Country/Territory	United States
City	Honolulu
Period	07/10/2012 → 12/10/2012
Internet address	http://www.electrochem.org/meetings/biannual/222/222.htm

Keywords

Energy conversion
Nickel
Oxidation
Reaction kinetics
Thermodynamics
Kinetics

Access to Document

10.1149/05049.0167ecst

Cite this

@inproceedings{feccd1510e9e4cc2b80c95a2e1e7cb1c,

title = "Kinetics of oxidation of H2 and reduction of H2O in Ni-YSZ based solid oxide cells",

abstract = "Reduction of H2O and oxidation of H2 was studied in a Ni-YSZ electrode supported Solid Oxide Cells produced at DTU Energy conversion (former Ris{\o} DTU). Polarisation (i-V) and electrochemical impedance spectroscopic characterisation show that the kinetics for reduction of H 2O is slower compared to oxidation of H2. The kinetic differences cannot be explained by the reaction mechanisms which are similar in the two cases but are rather an effect of the thermodynamics. The preliminary analysis performed in this study show that the slow kinetic for reduction is partly related to the endothermic nature of the reaction, cooling the active electrode, thereby leading to slower kinetics at low current densities. Likewise, the increased kinetic for oxidation was found to be related to the exothermic nature of the reaction, heating the active electrode, and thereby leading to faster kinetics. At higher current densities an increase caused by diffusion becomes more pronounced. {\textcopyright} The Electrochemical Society.",

keywords = "Energy conversion, Nickel, Oxidation, Reaction kinetics, Thermodynamics, Kinetics",

author = "Ebbesen, {Sune Dalgaard} and Mogensen, {Mogens Bjerg}",

year = "2012",

doi = "10.1149/05049.0167ecst",

language = "English",

volume = "50",

pages = "167--182",

journal = "E C S Transactions",

issn = "1938-5862",

publisher = "The Electrochemical Society",

number = "49",

note = "Pacific Rim Meeting on Electrochemical and Solid-State Science : 222nd Meeting of ECS — The Electrochemical Society and 2012 Fall Meeting of The Electrochemical Society of Japan, PRIME ; Conference date: 07-10-2012 Through 12-10-2012",

url = "http://www.electrochem.org/meetings/biannual/222/222.htm",

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TY - GEN

T1 - Kinetics of oxidation of H2 and reduction of H2O in Ni-YSZ based solid oxide cells

AU - Ebbesen, Sune Dalgaard

AU - Mogensen, Mogens Bjerg

PY - 2012

Y1 - 2012

N2 - Reduction of H2O and oxidation of H2 was studied in a Ni-YSZ electrode supported Solid Oxide Cells produced at DTU Energy conversion (former Risø DTU). Polarisation (i-V) and electrochemical impedance spectroscopic characterisation show that the kinetics for reduction of H 2O is slower compared to oxidation of H2. The kinetic differences cannot be explained by the reaction mechanisms which are similar in the two cases but are rather an effect of the thermodynamics. The preliminary analysis performed in this study show that the slow kinetic for reduction is partly related to the endothermic nature of the reaction, cooling the active electrode, thereby leading to slower kinetics at low current densities. Likewise, the increased kinetic for oxidation was found to be related to the exothermic nature of the reaction, heating the active electrode, and thereby leading to faster kinetics. At higher current densities an increase caused by diffusion becomes more pronounced. © The Electrochemical Society.

AB - Reduction of H2O and oxidation of H2 was studied in a Ni-YSZ electrode supported Solid Oxide Cells produced at DTU Energy conversion (former Risø DTU). Polarisation (i-V) and electrochemical impedance spectroscopic characterisation show that the kinetics for reduction of H 2O is slower compared to oxidation of H2. The kinetic differences cannot be explained by the reaction mechanisms which are similar in the two cases but are rather an effect of the thermodynamics. The preliminary analysis performed in this study show that the slow kinetic for reduction is partly related to the endothermic nature of the reaction, cooling the active electrode, thereby leading to slower kinetics at low current densities. Likewise, the increased kinetic for oxidation was found to be related to the exothermic nature of the reaction, heating the active electrode, and thereby leading to faster kinetics. At higher current densities an increase caused by diffusion becomes more pronounced. © The Electrochemical Society.

KW - Energy conversion

KW - Nickel

KW - Oxidation

KW - Reaction kinetics

KW - Thermodynamics

KW - Kinetics

U2 - 10.1149/05049.0167ecst

DO - 10.1149/05049.0167ecst

M3 - Conference article

VL - 50

SP - 167

EP - 182

JO - E C S Transactions

JF - E C S Transactions

SN - 1938-5862

IS - 49

T2 - Pacific Rim Meeting on Electrochemical and Solid-State Science

Y2 - 7 October 2012 through 12 October 2012

ER -