以水系流延法制备阳极支撑型平板式IT-SOFC的阳极/电解质(Ni-YSZ/YSZ)半电池,通过浸渍La2O3颗粒对半电池阳极进行改性,LSM+8YSZ为阴极制备单电池.采用扫描电子显微镜(SEM)观察单电池显微结构;利用能谱(EDS)测试阳极成分;单电池以乙醇水蒸气为燃料,在750℃下利用循环伏安法测试单电池的功率密度,交流阻抗法测试单电池的阻抗.结果表明:单电池Ni/YSZ阳极孔洞中浸渍的La2O3颗粒约90 nm;浸渍改性的电池比未浸渍的电池具有更稳定的电性能,随着La2O3浸渍量越来越多,电池的电性能和稳定性越来越好,抗积碳能力越来越强.当浸渍量为2.4wt%时,以乙醇水蒸气为燃料在750℃下运行7 h后,电池衰减率仅为0.09%/h.
For the planar anode-supported solid oxide fuel cell with Ni-YSZ anode, YSZ electrolyte was pre-pared by aqueous tape casting and La2O3 was impregnated into the Ni-YSZ anode. Traditional composite LSM-YSZ was used as the cathode. Microstructure and composition of the single cell were measured by scanning electron microstrscope(SEM)and energy dispersive spectra(EDS). When using ethanol/steam as fuel, the power density and impedance spectra of the single cell were measured by cyclic voltammetry and AC impedance method at 750℃. The results showed that impregnated La2O3 particles with size of 90 nm were distributed uni-formly around the pores of the anode. The single cell with impregnated La2O3 exhibited more stable performance than the cell without impregnated La2O3. With the increase of loading of La2O3, the single cell showed better per-formance and better anti-carbon deposition ability. The results show that degradation rate of the single cell is 0.09%/h after operating at 7 h with the La2O3loading of 2.4wt%.
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