Electrochemical Decomposition of CO2 and CO Gases Using Porous Yttria-stabilized Zirconia Cell
Electrochemical Decomposition of CO2 and CO Gases Using Porous Yttria-stabilized Zirconia Cell
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使用多孔氧化钇稳定氧化锆电池电化学分解 CO2 和 CO 气体
DOI：
10.1016/j.ceramint.2012.05.010
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发表时间：
2012
影响因子：
5.2
通讯作者：
S. Sameshima
中科院分区：
文献类型：
--
作者：
Y. Hirata;M. Ando;N. Matsunaga;S. Sameshima
采用Ru-8mol% YSZ阳极/多孔YSZ电解质/Ni-YSZ阴极体系的多孔电解槽，在400-800°C范围内对CO2和CO气体进行了电化学分解研究。在0.9-1.0V/cm的电场强度下，一部分以50 ml/min的流量供入的CO_2气体通过电解槽分解为固体碳和O_2气体。在700-800°C下，在3 ml/min的流速下的出口气体包括61-63%的CO2和37-39%的O2;在800° C下，在50 ml/min的流速下的出口气体包括73-96%（平均85%）的CO2和4-27%（平均15%）的O2。另一方面，供给的CO气体在800°C下也分解为固体碳、O2和CO2气体。在800°C、5 h、50 ml/min的流速下，CO分解的出口气体中CO、O_2和CO_2的含量分别为11-36%，59-81%，2-9%。详细讨论了CO2和CO气体的分解机理。阴极中的Ni金属和多孔YSZ颗粒在直流电场下都具有将CO气体分解为固体碳和O2−离子或O2气体的能力。
Electrochemical decomposition of CO2and CO gases using a porous cell of Ru-8mol% yttria-stabilized zirconia (YSZ) anode/porous YSZ electrolyte/Ni–YSZ cathode system at 400–800°C was studied by analyzing the flow rate and composition of outlet gas, current density, and phases and elementary distribution of the electrodes and electrolyte. A part of CO2gas supplied at 50ml/min was decomposed to solid carbon and O2gas through the cell at the electric field strengths of 0.9–1.0V/cm. The outlet gas at a flow rate of 3ml/min included 61–63% CO2and 37–39% O2at 700–800°C and the outlet gas at a flow rate of 50ml/min included 73–96% (average 85%) CO2and 4–27% (average 15%) O2at 800°C. On the other hand, the supplied CO gas was also decomposed to solid carbon, O2and CO2gases at 800°C. The fraction of outlet gas at a flow rate of 50ml/min during the CO decomposition at 800°C for 5h was 11–36% CO, 59–81% O2and 2–9% CO2. The detailed decomposition mechanisms of CO2and CO gases are discussed. Both Ni metal in the cathode and porous YSZ grains under the DC electric field have the ability to decompose CO gas into solid carbon and O2−ions or O2gas.