| 739 | 12 | 50 |
| 下载次数 | 被引频次 | 阅读次数 |
通过改进的自蔓延燃烧法合成制备高熵双钙钛矿Sm Ba(Mn0.2Fe0.2Co0.2Ni0.2Cu0.2)_2O5+δ(HE-SBC)阴极材料,并复合10%(摩尔分数)Gd_2O3掺杂CeO2(GDC)以优化性能。结果表明:通过B位高熵的方法可以显著减小Co离子由价态变化而引起的热膨胀,从而降低SmBaCo_2O5+δ的热膨胀系数。在800℃,以氧化钇稳定氧化锆(YSZ)为电解质的HE-SBC对称电池的极化阻抗(Rp)为1.04Ω?cm2,阳极支撑单电池的最高功率密度和Rp分别为683.53 m W/cm2和0.46Ω?cm2。进一步通过复合GDC(HE-SBC与GDC的质量比7:3)以增加三相界面提高HE-SBC的催化活性,在800℃HE-SBC-GDC复合阴极对称电池的极化阻抗仅为0.09Ω?cm2,且阳极支撑单电池的最高功率密度和Rp分别为838.66 m W/cm2和0.12Ω?cm2。
Abstract：High-entropy double perovskite SmBa(Mn0.2Fe0.2Co0.2Ni0.2Cu0.2)_2O5+δ(HE-SBC) as a cathode material was prepared by a modified Pechini method,and the performance of HE-SBC with 10%(in mole fraction) Gd_2O3-doped CeO2 (GDC)(HE-SBC-GDC)was optimized.The results show that the thermal expansion of Co ions caused by the change of valence state can be reduced due to the formation of high-entropy at B-site,thereby reducing the thermal expansion coefficient of SBC.The polarization impedance (Rp)of the HE-SBC symmetrical cell with yttria-stabilized zirconia (YSZ) as an electrolyte is 1.04??cm2 at 800℃and the maximum power density and Rp of the anode-supported single cell are 683.53 m W/cm2 and 0.46??cm2,respectively.Furthermore,the catalytic activity of HE-SBC is improved by the addition of GDC[m(HE-SBC):m(GDC)=7:3]due to the enlarged three-phase interface.The polarization resistance of HE-SBC-GDC composite cathode symmetric cell is only 0.09??cm2 at 800℃and the maximum power density and Rp of the anode-supported single cell are 838.66 m W/cm2 and 0.12??cm2,respectively.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20210514
中图分类号:TB34;TM911.4
引用信息:
[1]凌意瀚,韩绪,杨洋,等.高熵稳定双钙钛矿阴极材料Sm Ba(Mn_(0.2)Fe_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2))_2O_(5+δ)的制备及性能优化[J].硅酸盐学报,2022,50(01):219-225.DOI:10.14062/j.issn.0454-5648.20210514.
基金信息:
江苏省研究生实践创新计划项目(SJCX21＿1026)
2021-12-27
2021-12-27
2021-12-27