Modeling space charge layer interaction and conductivity enhancement in nanoionic composites
Modeling space charge layer interaction and conductivity enhancement in nanoionic composites
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DOI：
10.1016/j.electacta.2011.08.013
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发表时间：
2011-10
影响因子：
6.6
通讯作者：
C. Goodyer;J. Fish;J. Fehribach;R. O'Hayre;Annette L. Bunge
中科院分区：
文献类型：
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作者：
C. Goodyer;J. Fish;J. Fehribach;R. O'Hayre;Annette L. Bunge
数值计算了纳米离子复合材料中空间电荷层的形成对电导率的增强作用。从模拟结果中提取出最佳负载分数，并发现与空间电荷层的厚度相对于颗粒的大小有很大关系。这种行为与本文导出的近似解析表达式很好地吻合。在某些情况下，预测显著的电导率增强，即使纳米颗粒负载小至0.5体积%。该模型还应用于空间电荷层耗尽情景，并发现与最近的实验研究结果非常吻合。
Potential conductivity enhancement due to formation of space charge layers in nanoionic composites was computed numerically for several structures of non-conducting nanoparticles in a bulk ionic conductor. Optimum loading fractions were extracted from simulation results and found to depend strongly on the thickness of the space charge layer relative to the size of the particles. This behavior agreed well with an approximate analytical expression derived herein. In certain cases, significant conductivity enhancement was predicted, even for nanoparticle loadings as small as 0.5 volume %. The model was also applied to a space charge layer depletion scenario, and found to be in good agreement with results from a recent experimental study.