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Modelling of ambipolar transport properties of composite mixed ionic-electronic conductors

1996; Elsevier BV; Volume: 93; Issue: 1-2 Linguagem: Inglês

10.1016/s0167-2738(96)00521-8

1872-7689

Zhonglin Wu,

Conducting polymers and applications

The ability to transport both ionic and electronic species is one of the most important properties of a mixed ionic-electronic conductor for electrosynthesis, gas separation, and electrode applications. In this paper, resistor network approach is used to predict the effective conductivities of a composite mixed conductor consisting of any number of randomly-distributed phases. The model is further used to predict the effective ionic, electronic, and ambipolar transport behavior of two-phase and three-phase composite mixed conductors as a function of the volume fraction of each randomly-distributed constituent phase. Results indicate that the optimum ambipolar conductivity occurs only within certain volume fractions of the constituent phases, depending on their relative ionic and electronic conductivities.