Highly conductive phosphate glasses are promising material for energy storage, serving as electrolytes or electrodes based on their electrical conductivity type (ionic, polaronic, or mixed). An efficient way to enhance ionic conductivity in these materials is by adding another glass-forming oxide while keeping alkali oxide constant. The structural network composed of mixed glass-formers units facilitates ionic mobility producing well-known “mixed glass former effect” (MGFE). Replacing the conventional glass former (P2O5) with the conditional ones, such as transition metal oxides (TMOs), in alkali phosphate glasses is highly promising, due to different roles TMOs can play. They can influence ionic conductivity in a similar manner to classical MGFE and/or can actively contribute to conduction via polaronic transport, originating from electron transfer between TM ions in different oxidation states. In the latter case, a mixed conductive glass is obtained. The ratio between ionic/polaronic contributions is pivotal for material applications, while its tunability poses a major scientific challenge. The proposed project aims to elucidate mechanisms governing ionic and polaronic conductivity in alkali vanadate-phosphate glasses-(ceramics) by investigating their composition, structure, and preparation conditions. It comprises three interconnected components: (i) exploring a wide range of alkali vanadate-phosphate glass compositions (WP1, WP2), (ii) investigating influence of incorporating additional TMO (WP3) on electrical transport, aiming to develop highly conductive glass-(ceramics) with tunable conductivity. Finally, an essential aspect of the project entails studying catalytic properties of prepared glasses-(ceramics) for multifunctional applications. Techniques such as Raman/FTIR, MAS NMR, Mössbauer and EPR spectroscopy, PXRD, IS, DC measurements, charge/discharge capacity measurements, and coupled TG-IR and gas chromatography will ensure comprehensive characterization