Electrochemical reforming of CH4-CO2 gas using porous Gd-doped ceria electrolyte with Ni and Ru electrodes
Electrochemical reforming of CH4-CO2 gas using porous Gd-doped ceria electrolyte with Ni and Ru electrodes
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DOI：
10.2109/jcersj2.117.1147
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发表时间：
2009
影响因子：
1.1
通讯作者：
Shota Matayoshi;Y. Hirata;S. Sameshima;N. Matsunaga;Y. Terasawa
中科院分区：
文献类型：
--
作者：
Shota Matayoshi;Y. Hirata;S. Sameshima;N. Matsunaga;Y. Terasawa
采用Ni或Ru-GDC（Gd掺杂氧化铈）阴极/多孔GDC电解质/Ni、Ru或SrRuO 3-GDC阳极体系，在400° ~ 800 ° C、1.25 V/cm的电场强度下，研究了50%CH4 - 50%CO2混合气体的电化学重整反应。Ni作为阳极加速了CH 4的分解（CH 4 → C +2 H2），并由于阳极空隙中的碳沉积而导致供气堵塞。而阴极中的Ni则能很好地将CO2还原为CO和O2-离子（CO2 + 2 e- → CO + O2-）。在两种电极中使用Ru对阳极氧化CH 4（CH 4 + O2- → CO +2 H2 + 2 e-）和阴极还原CO2几乎没有问题。阳极中的SrRuO_3也起到了氧化CH_4的作用。这种氧化物与CH 4重整中产生的H2反应形成Ru和Sr。Sr在重整期间在800°C蒸发。使用具有Ni或Ru阴极和Ru阳极的电池在800°C下测量H2-CO燃料的稳定形成11-13小时。
Electrochemical reforming of 50% CH4-50% CO2 mixed gas was investigated using the cell of Ni or Ru-GDC (Gd-doped ceria) cathode/porous GDC electrolyte/Ni, Ru or SrRuO3-GDC anode system at 400°-800°C under 1.25 V/cm of electric field strength. Use of Ni as anode accelerated the decomposition of CH4 (CH4 → C + 2H2) and caused the blockage of supplied gas because of the deposition of carbon in the open spaces of anode. On the other hand, Ni in cathode worked well to reduce CO2 to CO and O2- ions (CO2 + 2e- → CO + O2-). Use of Ru in both electrodes gave little problems to oxidize CH4 in anode (CH4 + O2- → CO + 2H2 + 2e-) and to reduce CO2 in cathode. SrRuO3 in anode worked also to oxidize CH4. This oxide reacted with H2 produced in the reforming of CH4 to form Ru and Sr. Sr evaporated at 800°C during the reforming. Stable formation of a H2-CO fuel was measured for 11-13 h at 800°C using the cells with Ni or Ru cathode and Ru anode.