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The influence of the electrolyte on the electron diffusion in mesoporous nanocrystalline TiO2

Experimental studies show that the rate of electron diffusion in mesoporous nanocrystalline TiO2 may depend on the electrolyte concentration. In the available literature, this effect is attributed to ambipolar diffusion. We present arguments and a kinetic model indicating that it might instead be connected with different arrangements of cations near the traps occupied by an electron before and after tunnelling. With a reasonable choice of the ratio of the kinetic parameters, in agreement with experiment, the model predicts that the electron diffusion coefficient at high electrolyte concentrations may be about five times higher than at low concentrations.