Rate determining step of direct hydrogen and electricity production in SrZr0.9Yb0.1O3-a fuel cell supplied with CH4 + H2O

Satoshi Fukada; Shigenori Suemori; Ken Onoda

doi:10.1016/j.enconman.2009.01.023

Rate determining step of direct hydrogen and electricity production in SrZr_0.9Yb_0.1O_3-a fuel cell supplied with CH₄ + H₂O

Satoshi Fukada, Shigenori Suemori, Ken Onoda

Engineering Science for Advanced energy system

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Direct hydrogen production and its subsequent electricity generation in a ceramic fuel cell system of a SrZr_0.9Yb_0.1O_3-a tube with one end closed is investigated experimentally under the condition where moist CH₄ (or H₂) is supplied to its anode compartment and moist O₂ is supplied to its cathode compartment. Experiments are performed based on an alternating current impedance method. The following three mass transfer resistances are determined separately: (i) the steam generation reaction on its Ni anode (CH₄ + H₂O = CO + 3H₂); (ii) the transfer of hydrogen ions through the proton conducting ceramic; and (iii) the cathode reaction between H₂ and O₂. It is found that the rate determining step of the overall hydrogen transfer in the cell system of CH₄ + H₂O|Ni|SrZr_0.9Yb_0.1O_3-a|NiO|O₂ + H₂O is the steam reformation reaction on the anode. The electrochemical polarization of the anode due to the CH₄-steam reformation has the activation energy of 89.5 kJ/mol. On the other hand, the rate determining step of the system described as H₂(+H₂O)|Ni|SrZr_0.9Yb_0.1O_3-a|NiO|O₂ + H₂O is H⁺ migration through the ceramic electrolyte when T > 700 °C. The activation energy of H⁺ migration through the ceramic is 31.5 kJ/mol. The values of the Warburg impedance constants and capacitances of an electric double layer are determined as a function of temperature from 600 °C to 800 °C, when either a CH₄ + H₂O or H₂ + H₂O mixture is supplied to the anode.

Original language	English
Pages (from-to)	1249-1255
Number of pages	7
Journal	Energy Conversion and Management
Volume	50
Issue number	5
DOIs	https://doi.org/10.1016/j.enconman.2009.01.023
Publication status	Published - May 2009

All Science Journal Classification (ASJC) codes

Renewable Energy, Sustainability and the Environment
Nuclear Energy and Engineering
Fuel Technology
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.enconman.2009.01.023

Cite this

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title = "Rate determining step of direct hydrogen and electricity production in SrZr0.9Yb0.1O3-a fuel cell supplied with CH4 + H2O",

abstract = "Direct hydrogen production and its subsequent electricity generation in a ceramic fuel cell system of a SrZr0.9Yb0.1O3-a tube with one end closed is investigated experimentally under the condition where moist CH4 (or H2) is supplied to its anode compartment and moist O2 is supplied to its cathode compartment. Experiments are performed based on an alternating current impedance method. The following three mass transfer resistances are determined separately: (i) the steam generation reaction on its Ni anode (CH4 + H2O = CO + 3H2); (ii) the transfer of hydrogen ions through the proton conducting ceramic; and (iii) the cathode reaction between H2 and O2. It is found that the rate determining step of the overall hydrogen transfer in the cell system of CH4 + H2O|Ni|SrZr0.9Yb0.1O3-a|NiO|O2 + H2O is the steam reformation reaction on the anode. The electrochemical polarization of the anode due to the CH4-steam reformation has the activation energy of 89.5 kJ/mol. On the other hand, the rate determining step of the system described as H2(+H2O)|Ni|SrZr0.9Yb0.1O3-a|NiO|O2 + H2O is H+ migration through the ceramic electrolyte when T > 700 °C. The activation energy of H+ migration through the ceramic is 31.5 kJ/mol. The values of the Warburg impedance constants and capacitances of an electric double layer are determined as a function of temperature from 600 °C to 800 °C, when either a CH4 + H2O or H2 + H2O mixture is supplied to the anode.",

author = "Satoshi Fukada and Shigenori Suemori and Ken Onoda",

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doi = "10.1016/j.enconman.2009.01.023",

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T1 - Rate determining step of direct hydrogen and electricity production in SrZr0.9Yb0.1O3-a fuel cell supplied with CH4 + H2O

AU - Fukada, Satoshi

AU - Suemori, Shigenori

AU - Onoda, Ken

PY - 2009/5

Y1 - 2009/5

N2 - Direct hydrogen production and its subsequent electricity generation in a ceramic fuel cell system of a SrZr0.9Yb0.1O3-a tube with one end closed is investigated experimentally under the condition where moist CH4 (or H2) is supplied to its anode compartment and moist O2 is supplied to its cathode compartment. Experiments are performed based on an alternating current impedance method. The following three mass transfer resistances are determined separately: (i) the steam generation reaction on its Ni anode (CH4 + H2O = CO + 3H2); (ii) the transfer of hydrogen ions through the proton conducting ceramic; and (iii) the cathode reaction between H2 and O2. It is found that the rate determining step of the overall hydrogen transfer in the cell system of CH4 + H2O|Ni|SrZr0.9Yb0.1O3-a|NiO|O2 + H2O is the steam reformation reaction on the anode. The electrochemical polarization of the anode due to the CH4-steam reformation has the activation energy of 89.5 kJ/mol. On the other hand, the rate determining step of the system described as H2(+H2O)|Ni|SrZr0.9Yb0.1O3-a|NiO|O2 + H2O is H+ migration through the ceramic electrolyte when T > 700 °C. The activation energy of H+ migration through the ceramic is 31.5 kJ/mol. The values of the Warburg impedance constants and capacitances of an electric double layer are determined as a function of temperature from 600 °C to 800 °C, when either a CH4 + H2O or H2 + H2O mixture is supplied to the anode.

AB - Direct hydrogen production and its subsequent electricity generation in a ceramic fuel cell system of a SrZr0.9Yb0.1O3-a tube with one end closed is investigated experimentally under the condition where moist CH4 (or H2) is supplied to its anode compartment and moist O2 is supplied to its cathode compartment. Experiments are performed based on an alternating current impedance method. The following three mass transfer resistances are determined separately: (i) the steam generation reaction on its Ni anode (CH4 + H2O = CO + 3H2); (ii) the transfer of hydrogen ions through the proton conducting ceramic; and (iii) the cathode reaction between H2 and O2. It is found that the rate determining step of the overall hydrogen transfer in the cell system of CH4 + H2O|Ni|SrZr0.9Yb0.1O3-a|NiO|O2 + H2O is the steam reformation reaction on the anode. The electrochemical polarization of the anode due to the CH4-steam reformation has the activation energy of 89.5 kJ/mol. On the other hand, the rate determining step of the system described as H2(+H2O)|Ni|SrZr0.9Yb0.1O3-a|NiO|O2 + H2O is H+ migration through the ceramic electrolyte when T > 700 °C. The activation energy of H+ migration through the ceramic is 31.5 kJ/mol. The values of the Warburg impedance constants and capacitances of an electric double layer are determined as a function of temperature from 600 °C to 800 °C, when either a CH4 + H2O or H2 + H2O mixture is supplied to the anode.

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