Development of electrochemical cell with layered composite of the Gd-doped ceria/electronic conductor system for generation of H2–CO fuel through oxidation–reduction of CH4–CO2 mixed gases
Development of electrochemical cell with layered composite of the Gd-doped ceria/electronic conductor system for generation of H2–CO fuel through oxidation–reduction of CH4–CO2 mixed gases
复制标题
开发具有掺钆二氧化铈/电子导体系统层状复合材料的电化学电池，用于通过 CH4-CO2 混合气体的氧化还原产生 H2-CO 燃料
DOI：
10.1016/j.ceramint.2008.11.001
复制
发表时间：
2009
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;Y. Terasawa;N. Matsunaga;S. Sameshima
本文介绍了层状复合材料在同一电池中促进两种类型的电化学反应(氧化和还原)的最新结果。该电池由多孔镍-Gd掺杂CeO_2阴极/薄型多孔GDC电解液(50μm)/多孔SrRuO_3-GDC阳极组成。外加电流分别在1.25和6.25V/cm的电场强度下流入该电池。在电场作用下，以50毫升/分钟的速度将甲烷(30-70%)和二氧化碳(70-30%)的混合气体加入加热温度为400-800°C的电池中。在阴极中，CO2被还原为CO(Co2+2E−→CO+O2−)，生成的CO和O2−离子通过GDC膜的气孔、颗粒表面和内部被输送到阳极。另一方面，CH4在阳极上与扩散的O2−离子(CH4+O2−→CO+2H2+2E−)反应生成CO和H2。结果表明，甲烷-二氧化碳混合气体(CH_4+CO_2、→_2H2+2CO)可制得H_2-CO混合燃料。该电化学反应在800℃下完全进行，长时间(~gt；10h)未检测到气体堵塞。在起始CH4-CO2气体的宽幅气体成分中只产生了H2-CO燃料。
This paper shows the recent results on the development of layered composite promoting two types of electrochemical reactions (oxidation and reduction) in one cell. This cell consisted of porous Ni–Gd-doped (GDC) ceria cathode/thin porous GDC electrolyte (50μm)/porous SrRuO3–GDC anode. The external electric current was flowed in this cell at the electric field strength of 1.25 and 6.25V/cm. The mixed gases of CH4(30–70%) and CO2(70–30%) were fed at the rate of 50ml/min to the cell heated at 400–800°C under the electric field. In the cathode, CO2was reduced to CO (CO2+2e−→CO+O2−) and the formed CO and O2−ions were transported to the anode through the pores and surface and interior of grains of GDC film. On the other hand, CH4was oxidized in the anode to form CO and H2through the reaction with diffusing O2−ions (CH4+O2−→CO+2H2+2e−). As a result, H2–CO mixed fuel was produced from the CH4–CO2mixed gases (CH4+CO2→2H2+2CO). This electrochemical reaction proceeded completely at 800°C and no blockage of gases was measured for long time (>10h). Only H2–CO fuel was generated in the wide gas compositions of starting CH4–CO2gases.