An electrode for use in an all-iron redox flow battery is provided. In one example, the electrode may include a plastic mesh; and a coating on the plastic mesh. The coating may be a hydrophilic coating or a conductive coating and the electrode may have an electrode reaction potential is less than 0.8V. Further, a method of manufacturing a coated plastic mesh electrode for use in an all-iron redox flow battery is provided. In one example method, the steps include fabricating a plastic mesh, treating the plastic mesh by applying a solvent treatment or a plasma treatment or a mechanical abrasion treatment; coating the plastic mesh with a material selected from: carbon inks, metal oxides, and hydrophilic polymers.

Described herein are systems and methods of storing and delivering electrical using hydrogen at low-cost and for long-durations. The systems and methods use energy-bearing redox pairs that electrochemically bear energy through decoupled hydrogen and oxygen consumption and/or evolution reactions, which are typically associated with fuel cells. Each species of the energy-bearing redox pair is associated with a standard electrode potential within a water electrolysis voltage window for the electrolyte solution. Electrical energy delivery, hydrogen generation, electrolyte regeneration, or combinations thereof can be performed by logically or physically separated unit operations in a continuous manner, batch manner, or semi-batch manner facilitated by the energy-bearing redox pair.

Described herein are systems and methods of hydrogen generation and electrolyte regeneration as independent operations in separate redox flow cells. The operations can be decoupled by using an energy-bearing redox pair that electrochemically bears energy facilitating flexible, efficient hydrogen generation. In one example, the hydrogen generation redox flow cell can include a liquid, energy-bearing electrolyte solution in which at least one species of an energy-bearing redox pair is dissolved, to decouple the hydrogen evolution reaction from the reaction at the opposite electrode (e.g., the oxygen evolution reaction of conventional direct water electrolysis). Each species of the energy-bearing redox pair is associated with a standard electrode potential within the water electrolysis window.

A system and method for providing inerting gas to a protected space. Oxygen is directed from an oxygen source to a motive port of an ejector, and air is introduced to a suction port of the ejector. A gas mixture of oxygen and air is directed from an outlet port of the ejector to a reactor, and a reactant is directed from a reactant source to the reactor. Oxygen in the gas mixture is reacted with the reactant to incorporate the oxygen into a non-combustible compound, and an inerting gas comprising the non-combustible compound is directed to the protected space.

Disclosed is a high temperature-type unitized regenerative fuel cell using water vapor, which exhibits high hydrogen (H.sub.2) production efficiency and superior power generation ability.

The current disclosure teaches one to achieve PBI membranes with high ionic conductivity and low mechanical creep for the first time. This is in contrast to previous teachings of PBI membrane fabrication methods, which yield PBIs with either high ionic conductivity and high mechanical creep or low ionic conductivity and low mechanical creep. The membranes produced according to the disclosed process provide doped membranes for applications in fuel cells and electrolysis devices such as electrochemical separation devices.

A method for manufacturing a porous transport layer (4) of an electrochemical cell includes mixing a metal powder with a binder and a subsequent shaping-out into a foil. The foil is brought to bear on a porous metal layer (8). The binder is subsequently removed and the remaining brown part layer (9) is sintered to the porous metal layer (8), so that a porous transport layer (4) is formed which includes a porous metal layer (8) with a microporous metal layer (9) which is deposited thereon.

A metal plate configured such that sufficient strength and performance are ensured and the workability and cost of mass production are improved, and a metal-supported electrochemical element and the like including the metal plate. Also, a method for manufacturing a metal plate including a rolling step for rolling a metal material provided with a penetration space passing through the metal material in a thickness direction to reduce the thickness of the metal material and reduce the area of a surface opening formed in the surface of the metal material by the penetration space, thereby producing a plate-like metal plate.

An active element for an electrochemical apparatus or an electrical energy generating apparatus may include a plane or curved, generally plate-type, sheet-type or mesh-type support body. A surface of the support body is at least partly (preferably entirely) coated with amorphous nickel boron or nickel thallium boron or a similar amorphous, columnar growth boron containing coating having a nodular topography.

An electrochemical apparatus includes a catholyte, an anolyte, and a separator disposed between the catholyte and the anolyte. The catholyte includes metal salt dissolved in water, thereby providing at least one metal ion. The anolyte includes a polysulfide solution. The separator is permeable to the at least one metal ion. During a charging process of the electrochemical apparatus, oxygen is generated in the catholyte, the polysulfide in the polysulfide solution undergoes a reduction reaction in the anolyte, and the at least one metal ion moves from the catholyte to the anolyte. During a discharging process of the apparatus, the oxygen is consumed in the catholyte, the polysulfide oxidizes in the anolyte, and the at least one metal ion moves from the anolyte to the catholyte.