The invention relates to a method for operating a regenerative bipolar membrane fuel cell and regenerative bipolar cell for storing and generating energy. The method according to the invention comprises: providing a regenerative bipolar membrane fuel cell comprising: a reactor with an anode compartment having an anode and a cathode compartment having a cathode; and a number of cell units separating the anode and cathode compartments, wherein the cell unit comprises an anion exchange membrane, a cation exchange membrane, and a bipolar, with the membranes defining compartments; providing a fluid on both sides of the bipolar membrane with ion concentrations such that water activity difference between the fluids on both sides of the bipolar membrane is minimized; storing energy in an energy storage state by providing an external current to the reactor such that a p H difference between fluids in contact with the bipolar membrane is achieved; switching between the energy storage state and an energy generation state; and regenerating energy in the energy generating state from the p H difference between fluids in contact with the bipolar membrane.

Provided is a flight path calculating method for high altitude long endurance of an unmanned aerial vehicle based on regenerative fuel cells and solar cells according to an exemplary embodiment of the present invention may include a modeling step, a simulation step, and an analyzing step, and may be configured in a program form executed by an arithmetic processing means including a computer. a flight path searching method and a flight path searching apparatus for performing continuous flight path re-searching on the basis of information measured in real time during a flight of the unmanned aerial vehicle in the stratosphere to change a flight path so that the unmanned aerial vehicle may permanently perform long endurance in the stratosphere is provided.

A solid oxide cell (SOC) includes a fuel electrode, an oxygen electrode, and an electrolyte. In some embodiments, the solid oxide cell is a reversible proton conducting solid oxide cell (P-rSOC). In some embodiments, the oxygen electrode is a perovskite oxide material having a formula such as PrBa.sub.0.8Ca.sub.0.2Co.sub.2O.sub.5+?, PrBa.sub.0.9Co.sub.1.96Nb.sub.0.04O.sub.5, PrBaCo.sub.1.6Fc.sub.0.2Nb.sub.0.2?xO.sub.5+?, PrBa.sub.0.5Sr.sub.0.5Co.sub.1.5Fe.sub.0.5O.sub.5+? (PBSCF), or PrBaCo.sub.2O.sub.5+? (PBC) and it is coated with a perovskite oxide catalyst such as PrCoO.sub.3.

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. In further aspects, the invention relates to a power distribution system and electrolysis plant comprising said power converter system, as well as to related methods.

The present disclosure provides systems and methods for generating and storing hydrogen and electricity. The systems generally include an electrolyzer stack, a fuel cell stack operably connected to the electrolyzer stack, and a hydrogen recirculation stack operably connected to the electrolyzer stack and to the fuel cell stack.

A coating apparatus for double-sidedly coating a porous web with a dope, includes: (i) a slot-die coating head comprising an upper lip, a lower lip and a slot between the upper lip and the lower lip, (ii) a counter element arranged opposite the lower lip across a reference plane, (iii) a slit defined between the lower lip and the counter element for passing a porous web therebetween, the slot opening up towards the slit, and (iv) a web positioning element. The web positioning element is the upper lip of the slot-die coating head. The upper lip protrudes up to the reference plane so that there is an offset between the upper lip and the lower lip, or a spacing structure on the counter element. The spacing structure protrudes up to the reference plane so that there is an offset between the spacing structure and the counter element.

An object of the present invention is to provide a carbon dioxide treatment apparatus, a carbon dioxide treatment method, and a method of producing carbon compounds, which have high energy efficiency from carbon dioxide capture to reduction and a high carbon dioxide loss reduction effect. In a carbon dioxide treatment apparatus 100 including: a capturing device 1 that captures carbon dioxide; and an electrochemical reaction device 2 that electrochemically reduces carbon dioxide, an absorption unit 12 of the capturing device 1 brings an electrolytic solution A composed of a strong alkaline aqueous solution and carbon dioxide gas into contact with each other to dissolve carbon dioxide in the electrolytic solution A and absorb the carbon dioxide, supplies an electrolytic solution B that has absorbed carbon dioxide between the cathode and the anode of the electrochemical reaction device 2, and electrochemically reduces the dissolved carbon dioxide in the electrolytic solution at the cathode.

Disclosed are air electrode materials suitable for use in solid oxide electrochemical cells (SOCs). The disclosed cells can operate in a dual function modes, i.e., as a fuel cell and as an electrolysis cell. In both cases, chemical energy and electrical energy can be directly convert from one mode to the other; thereby providing a highly efficient energy conversion process that can be used as a sustainable energy source.

Disclosed is a fuel cell-based multiple power supply system, and more particularly a fuel cell-based multiple power supply system capable of alternately operating a polymer electrolyte membrane fuel cell that is rapidly started up and provides fast response and a solid oxide fuel cell that provides high power generation efficiency depending on required situations and remedying some power deficiency using an energy storage system or a secondary battery, such as a super capacitor, thereby flexibly dealing with a situation difficult to solve using a single fuel cell.

An electro-synthetic water electrolysis cell, and method of operation, including a first gas diffusion electrode configured to generate a first gas and be in direct contact with a first gas body including the first gas, and a second electrode. A porous capillary spacer is configured to be filled with a liquid electrolyte and is positioned between the first gas diffusion electrode and the second electrode. Preferably, an average pore diameter of the porous capillary spacer is more than 2 m (microns).