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成果報告書詳細
管理番号20170000000142
タイトル*平成28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2017/4/27
報告書年度2016 - 2016
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Title: Low cost hydrogen production and electric storage based on highly efficient power generation using solid oxide reversible type cell.

In the last year, it was found that activity and stability of NiFe-SDC fuel electrode was reasonable under reversible operation condition, however, after 50 cycles, terminal potential was slightly decreased by sintering. In this year, application of oxide for fuel electrode was studied and it was found that Ce0.6Mn0.3Fe0.1O2 (CMF) shows reasonable activity to electrolysis. The observed resistance of CMF fuel electrode decreased with increasing applied potential suggesting that the reduced state of CMF is active to electrolysis reaction. Reversible operation was also studied and reasonable reversibility of the electrode activity was also confirmed.
Preparation of thin film LSGM electrolyte for low temperature steam electrolysis was studied by optimizing the slurry preparation method. By removing bubbles and dust in LSGM slurry, LSGM film with reasonable density was successfully prepared on Ni-GDC porous substrate. The observed open circuit potential was higher than 1.1 V at temperature higher than 500℃, and the power densities of 700 and 50 W/cm2 were achieved at 700 and 500℃, respectively. Although during reduction, crack may be formed and so the OCV is still small, steam electrolysis was performed by using the prepared tubular type cell and the electrolysis current was achieved 0.35 and 0.08A/cm2 at 700 and 500℃, respectively. For achievement of the objective value, further improvement of air electrode activity is still required.
For achieving high charge rate at lower temperature, increase in the reduction rate of Fe3O4 was further required. In this year, we examined the several oxides mixed with Fe for increasing redox rate and stability against cycle redox. It was found that mixing PrBaMn2O5 double perovskite oxide and Cr2O3 was highly effective and almost the theoretical weight change for Fe3O4 to Fe was observed and also weight change was hardly changed by redox treatment up to 10 cycles at 350℃. Charge and discharge property of Fe-air battery using Fe+PrBaMn2O5+Cr2O3 powder was further examined. Discharge and charge potentials of 0.8 and 1.4 V were observed. The discharge capacity of 800 mAh/g-Fe was stably sustained over 20 cycles. Therefore, by increasing redox property of Fe powder with PrBaMn2O5 and Cr2O3, cycle stability of Fe-air battery can be increased. Impedance analysis suggests that the decreased discharge potential could be assigned to the large air electrode overpotential and so decrease in air electrode overpotential is still required for further increasing charge and discharge efficiency.
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