成果報告書詳細
管理番号20140000000093
タイトル*平成25年度中間年報 固体酸化物形燃料電池等実用化推進技術開発 次世代技術開発 可逆動作可能な固体酸化物型燃料電池による低コスト水素製造および高効率発電を利用した電力貯蔵
公開日2014/5/17
報告書年度2013 - 2013
委託先名国立大学法人九州大学
プロジェクト番号P13001
部署名新エネルギー部
和文要約
英文要約 For development of reversible operation SOFCs, active fuel side anode (anode for SOFC) are essentially required. In this study, effects of oxide ion conductor with NiFe bimetal were investigated. It was found that fuel electrode activity in both electrolysis and fuel cell mode was much increased by mixing Sm doped CeO2 or La(Sr)Fe(Mn)O3. In particular, NiFe mixed with 10 wt% Sm doped CeO2 shows 1.75 A/cm2 at 1.6V for H2O(40vol%) electrolysis and 0.6W/cm2 of maximum power density for H2+3 vol% H2O at 1073 K. Application of NiFe cermet for Fe-air reversible cell and discharge potential as well as discharge capacity were further studied and in agreement with reversible cell, in Fe-air cell mode, discharge potential and capacity were also much increased by using NiFe cemet. Although we did not examine NiFe-GDC cermet for fuel electrode, it can be said that NiFe-CeO2 base cermet is promising for anode of reversible type SOFC.
In order to make testing cell, tubular type cell is essentially required. In this study, by using donated Ni-GDC cermet substrate, preparation of LSGM electrolyte film was studied with dip coated method. LSGM film with 40mm thick film was successfully deposited by using Ti added LDC as a buffer layer. After co-sintering, dense LAGM film was obtained, however, during reduction of NiO-GDC substrate, expansion of substrate was occurred and the LSGM film was clucked. Therefore, reduction of Ni-GDC substrate is important to obtain the dense LSGM film. By using diluted H2 for reduction, dense LSGM film could be obtained and 1.0 V of OCV was observed. However, the observed OCV is slightly lower than theoretical value. Therefore, further detail study on reduction of substrate are required.
For achieving high discharge rate, effect of catalyst on Fe for oxidation was studied and pure Fe powder is not oxidized up to 673K, however, by combination with La(Sr)Fe(Mn)O3 or Ce(Mn.Fe)O2, oxidation of Fe can be occurred from 473K and finalized at 773K. Therefore, modification of Fe powder with these oxide ion conducting oxide could be much increased Fe oxidation rate and reversibility of redox reaction.
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