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Rb2Ti2O5 (RTO) has recently been demonstrated to be a solid electrolyte,producing colossal capacitance when interfaced with metals. In order tounderstand the mechanisms leading to such colossal equivalent permittivity (upto four orders of magnitude above state-of-the-art values), the chargedistribution in RTO is a key feature to be investigated. In the presentarticle, this charge distribution is probed using the pressure-wave-propagationmethod, in devices made of RTO single crystals or polycrystals sandwichedbetween two metallic electrodes. Remarkably enough, in both types of samples,negative charges are found to accumulate inside RTO, near the anode, while theelectric field near the cathode remains zero. This proves that the ioniccarriers are majoritarily negatively charged and provides an explanation forthe colossal capacitance. The latter takes place only at the anode while thecathode is virtually shifted into the solid electrolyte.

Virtual cathode induced in Rb2Ti2O5 solid electrolyte