Electrochemical reforming of CH4−CO2 mixed gas using porous Gd-doped ceria electrolyte with Cu electrode
Electrochemical reforming of CH4−CO2 mixed gas using porous Gd-doped ceria electrolyte with Cu electrode
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DOI：
10.1016/j.ceramint.2012.05.061
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发表时间：
2012-12
影响因子：
5.2
通讯作者：
Yutaro Suga;Rie Yoshinaga;N. Matsunaga;Y. Hirata;S. Sameshima
中科院分区：
文献类型：
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作者：
Yutaro Suga;Rie Yoshinaga;N. Matsunaga;Y. Hirata;S. Sameshima
本文报道了三种不同的电化学电池：电池A （Ni - GDC（掺杂了gd的铈：Ce0.8Gd0.2O1.9）阴极/多孔GDC电解质/Cu - GDC阳极）、电池B （Cu - GDC阴极/多孔GDC电解质/Cu - GDC阳极）和电池C （Ru - GDC阴极/多孔GDC电解质/Cu - GDC阳极）在ch4与co2的转化过程中，出口气体的组成、流速和电流密度。在阴极，CO与供给的电子反应生成CO燃料和O2−离子（CO2+2e−→CO+O2−）。电池B中Cu阴极对co2的亲和力过低，降低了co2与电子的反应活性。CO燃料、O2−离子和ch4气体通过O2−离子和电子的多孔GDC混合导体传输到阳极。在阳极，CH4与O2−离子反应生成CO和h2燃料（CH4+O2−→2H2+CO+2e−）。在700 ~ 800℃时，B电池的重整效率最低，A电池的重整效率最高。A电池和C电池中的Cu阳极可以很好地用O2 -离子（2Cu+O2 -→Cu2O+2e -, Cu2O+CH4→2Cu+CO+2H2）氧化CH4。然而，在700 - 800°C时，所有电池的出口气体都发生堵塞。在重整过程中，由于金属陶瓷阴极的孔径减小，以及阳极中Cu金属的烧结和晶粒生长，气体流动受到抑制。
This paper reports on the composition and flow rate of outlet gas and current density during the reforming of CH4with CO2using three different electrochemical cells: cell A, with Ni−GDC (Gd-doped ceria: Ce0.8Gd0.2O1.9) cathode/porous GDC electrolyte/Cu−GDC anode, cell B, with Cu−GDC cathode/ porous GDC electrolyte/Cu−GDC anode and cell C, with Ru−GDC cathode/ porous GDC electrolyte/ Cu−GDC anode. In the cathode, CO2reacts with supplied electrons to form CO fuel and O2−ions (CO2+2e−→CO+O2−). Too low affinity of Cu cathode to CO2in cell B reduced the reactivity of the CO2with electrons. The CO fuel, O2−ions and CH4gas were transported to the anode through the porous GDC mixed conductor of O2−ions and electrons. In the anode, CH4reacts with O2−ions to produce CO and H2fuels (CH4+O2−→2H2+CO+2e−). The reforming efficiency at 700−800°C was lowest in cell B and highest in cell A. The Cu anode in cells A and C worked well to oxidize CH4with O2−ions (2Cu+O2−→Cu2O+2e−, Cu2O+CH4→2Cu+CO+2H2). However, a blockage of the outlet gas occurred in all the cells at 700−800°C. The gas flow is inhibited due to a reduction in pore size in the cermet cathode, as well as sintering and grain growth of Cu metal in the anode during the reforming.