The PEREN Project is dedicated to industrial research. It deals with ceramic cells as heart of High Temperature Electrolysers (HTE) for centralized hydrogen production. The project proposes to develop cells with metal supported innovative architecture, allowing working at 600-700°C, and optimized in terms of performance, durability and robustness. Its aim is the technological validation of this cell concept at a large scale for a later industrial development. In order to optimize the elaboration way of this cell and to lead to the expected performances and robustness, the project favors both the reduction of the electrolyte thickness, in between 1 to 5 µm to reduce its ohmic resistance, and the optimization of electrode materials as well as their microstructure. In order to obtain a thin and dense electrolyte and to preserve the porous metal support during a possible high temperature sintering step under oxidizing atmosphere, deposition processes of thin layers, allowing dense membranes at low temperature, have been selected. In parallel, a functional coating will be developed on the metallic porous support in order to preserve its electrical conductivity under H2/H2O atmosphere and to protect it against oxidation during assembling and when operating. The choice of materials is based on their known electrochemical performances for an operating temperature of 600-700°C in SOFC, and based on the previous results obtained in HTE at 800°C. The purpose of PEREN Project is at least to validate the technological reliability of this cell concept by manufacturing cells of pre-industrial size, and to integrate them in an existing HTE prototype at the level of a Single Repeat Unit (SRU). The expected results for considering the project to be successful are: The manufacture of lab-scale cells (about 3 cm² active surface area) with respect to the specifications of the components, and with the following targets for operating at 700°C: - 0.5 A/cm² at 1.3 V (650 mW/cm²), - 3% degradation per 1000 h; The up scaling of cell manufacture with a pre-industrial size (active surface area of 100 cm²) The technological validation of the concept, at a significant scale for a future industrial development integrating preindustrial size cells in a HTE SRU, and with the following features for operating at 700°C: 0.4 A/cm² at 1.3 V (520 mW/cm²), 5% degradation per 1000 h; If the performance targets of the complete cells are reached at 700°C, some tests will be carried out in the 600-700°C range to evaluate the impact of the temperature reduction on the durability. The technical and scientific fields concerned by this project are: Solid state chemistry and electrochemistry, with material knowhow for high temperature electrochemical cell applications, and functional coatings High temperature corrosion, with metallic porous material behaviour under oxidation when working and during sintering. Material engineering including powder optimization, microstructures, component co-sintering , interfacial constraint management Mechanical engineering, by adapting an existing HTE prototype to the metal supported cell concept. Physico-chemical characterizations, with evaluations of cells performances in HTE, and their post-fabrication and post-mortem characterizations. The project structure is based on a logical sequence of cell manufacturing, and on complementary skills of each partner.