Abstract: This invention relates a non-sintered green sheet or tape comprising a corrugated surface having alternating crests and troughs arranged along both a first direction of the surface and a second direction of the surface, the second direction forming an angle of between 60° to 120° to the first direction, wherein the corrugation periods and/or corrugation amplitudes in the first direction differ from those in the second direction. The invention enables preparation of a reliable, large-sized ceramic sheet material, e.g. as a ceramic electrolyte layer for use in solid oxide cells, as a ceramic sheet for filter or membrane applications, or as sintering substrate or setter. In addition, sintered ceramic sheets and electrolytes, methods of preparation, and solid oxide cells (SOCs) making use of the non-sintered green sheet or tape are described.

Abstract: The present invention relates to a power converter system for a plurality of electrolysis cell stack units, comprising: a parallel arrangement of multiple DC/DC converter modules; wherein each DC/DC converter module is configured to power a single electrolysis cell stack unit; and wherein each DC/DC converter module is capable of supplying the electrolysis cell stack unit with a predetermined variation of current, power and/or voltage such that near-thermoneutral operation at part load is enabled by matching the integral Joule heat production with the integral reaction heat consumption inside the electolysis cell stack unit, and/or wherein each DC/DC converter module is capable of reversing the current supplied to said electrolysis cell stack unit, causing said electrolysis cell stack unit to perform in fuel cell mode. The power converter system enables facilitated and inexpensive power distribution, long lifetime, as well as improved thermal management during operation of the electrolysis cell stacks.

Abstract: This invention relates to a system comprising one or more electrolysis cell(s) and at least one power electronic unit that supplies the cell(s) with a fluctuating voltage, and to a method for operating one or more electrolysis cell(s), comprising providing one or more voltage fluctuations to the electrolysis cell(s) by at least one power electronic unit, enabling the provision of a low-cost electrolysis system which simultaneously allows for fast-response dynamic operation, improved electrolysis efficiency, increased lifetime and high impurity tolerance.