The main focus of the proposal is on the development of nanocrystalline materials for high and low temperature energy conversion devices and their characterisation in working devices. Materials with grain sizes < 100 nm offer high Electrochemical activity. Functional ceramic materials for these devices will be prepared using state-of-the-art fabrication methods: spray pyrolysis, electrospinning and electrodeposition. Fabricated functional layers will be tested as parts of the high temperature fuel/electrolysis cells (SOFCs/SOECs) and low temperature alkaline electrolyser cells (AECS). These two parallel research tracks utilise similar ceramic processeing methods and employed together in a single project offer Synergistic effects. Combining modern energy conversion technologies based on electrolysis and fuel cells with intermittent renewable energy sources (wind or solar) will allow for a closed loop of green clean energy supply.