Cu-CeO_2基阳极直接甲烷SOFC的制备及其性能

采用干压法制备了NiO-YSZ(氧化钇稳定氧化锆)/(ZrO2)0.89(Sc2O3)0.1(CeO2)0.01(10ScSZ-1CeO2)半电池,经还原-酸溶法除去NiO制备了多孔YSZ负载致密10ScSZ-1CeO2双层结构,通过浸渍法在多孔YSZ阳极基体中引入Ce、Cu的硝酸盐制备Cu-CeO2-YSZ复合阳极,结合La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF)阴极构建了Cu-CeO2-YSZ/10ScSZ-1CeO2/LSCF单元电池.通过X射线衍射(XRD)和场发射扫描电镜(FESEM)等手段对电池单元的物相、微观结构进行表征.结果表明:还原-酸溶法制备的YSZ/10ScSZ-1CeO2双层结构的YSZ基体具有孔隙率高(64%)、孔洞连通性好的微观结构,有助于采用浸渍法引入Ce、Cu硝酸盐;10ScSZ-1CeO2电解质薄膜致密无缺陷,厚约30μm.电性能测试表明所构建单元固体氧化物燃料电池(SOFC)具有良好的电性能输出,在650℃以湿H2和CH4为燃料时的最大功率密度分别为0.29和0.09W·cm-2;在700℃以湿H2和CH4为燃料时的最大功率密度分别达到0.48和0.21W·cm-2.优良的电性能主要归功于小的电解质内阻和阴极极化电阻以及良好的阳极微观结构.

Fabrication and Performance of Direct Methane SOFC with a Cu-CeO_2-Based Anode

Highly porous yttria stabilized zirconia (YSZ) supported dense (ZrO_2)_(0.89)(Sc_2O_3)_(0.1)(CeO_2)_(0.01) (10SCSZ-lCeO_2) bilayers were fabricated by removing NiO with a reduction-acid leaching method using NiO-YSZ/lOScSZ-lCeO_2 half cells that were prepared by dry-pressing. By allowing Ce and Cu nitrate solutions to infiltrate the porous YSZ matrix, single cells of Cu-CeO_2-YSZ/10ScSZ-lCeO_2/LSCF (LSCF: La_(0.6)Su_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ) were fabricated. The cell's structure was characterized by X-ray diffractometry (XRD) and field-emission scanning electron microscopy (FESEM). Results showed that the porous YSZ matrix of the YSZ/10ScSZ-lCeO_2 bilayers prepared by the reduction-acid leaching method was of high porosity (more than 64%) and it was highly connected, which was beneficial for the introduction of Ce and Cu nitrate by infiltration. The 10ScSZ-lCeO_2 electrolyte film with a thickness of 30 μ-m was dense and pinhole-free. A single cell composed of Cu-CeO_2-YSZ/10ScSZ-lCeO_2/LSCF showed excellent generation performance with maximum power densities of 0.29 and 0.09 W·cm~(-2) at 650 ℃, as well as 0.48 and 0.21 W·cm~(-2) at 700 ℃ using moist hydrogen and methane as fuel, respectively. This excellent performance is attributed to the electrolyte's small ohmic resistance, small cathode polarization resistance, and favorable anode microstructure.