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

研究成果: ジャーナルへの寄稿学術誌査読

4 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)1249-1255
ページ数7
ジャーナルEnergy Conversion and Management
50
5
DOI
出版ステータス出版済み - 5月 1 2009

!!!All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • 原子力エネルギーおよび原子力工学
  • 燃料技術
  • エネルギー工学および電力技術

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