Redox flow devices are described including a positive electrode current collector, a negative electrode current collector, and an ion-permeable membrane separating said positive and negative current collectors, positioned and arranged to define a positive electroactive zone and a negative electroactive zone; wherein at least one of said positive and negative electroactive zone comprises a flowable semi-solid composition comprising ion storage compound particles capable of taking up or releasing said ions during operation of the cell, and wherein the ion storage compound particles have a polydisperse size distribution in which the finest particles present in at least 5 vol % of the total volume, is at least a factor of 5 smaller than the largest particles present in at least 5 vol % of the total volume.

Redox flow devices are described including a positive electrode current collector, a negative electrode current collector, and an ion-permeable membrane separating said positive and negative current collectors, positioned and arranged to define a positive electroactive zone and a negative electroactive zone; wherein at least one of said positive and negative electroactive zone comprises a flowable semi-solid composition comprising ion storage compound particles capable of taking up or releasing said ions during operation of the cell, and wherein the ion storage compound particles have a polydisperse size distribution in which the finest particles present in at least 5 vol % of the total volume, is at least a factor of 5 smaller than the largest particles present in at least 5 vol % of the total volume.

A fuel cell plate comprising a face intended to route a fuel gas or an oxidizing gas to the active surface of a Membrane Electrode Assembly, said face of the plate comprising projecting ribs delimiting a determined number of channels provided for the circulation of gas, the channels having a determined length (LCA) and a determined width (E), the ribs having a determined width (LA), the plate being characterized in that the product P of the total length (LN) of the ribs on the plate per unit of active surface (in cm.sup.2) multiplied by the rate of opening (TO) of the plate is between 4.7 and 10, i.e. that 4.7<P (cm.sup.−1)=LN×TO)/S<10, the rate of opening TO being defined by TO=100.Math.(E/E+LA), the active surface of the plate being the surface of the plate intended to be facing the active surface of the Membrane Electrode Assembly.

A fuel cell plate comprising a face intended to route a fuel gas or an oxidizing gas to the active surface of a Membrane Electrode Assembly, said face of the plate comprising projecting ribs delimiting a determined number of channels provided for the circulation of gas, the channels having a determined length (LCA) and a determined width (E), the ribs having a determined width (LA), the plate being characterized in that the product P of the total length (LN) of the ribs on the plate per unit of active surface (in cm.sup.2) multiplied by the rate of opening (TO) of the plate is between 4.7 and 10, i.e. that 4.7<P (cm.sup.−1)=LN×TO)/S<10, the rate of opening TO being defined by TO=100.Math.(E/E+LA), the active surface of the plate being the surface of the plate intended to be facing the active surface of the Membrane Electrode Assembly.

An off-grid power system includes a first renewable electrical power assembly configured to produce direct current (DC) electrical power from a first renewable source; a second renewable electrical power assembly configured to produce DC electrical power from a second renewable source; an electrical power circuit that electrically couples the first and second renewable electrical power assemblies together and changes the DC electrical power to at least one of a DC power supply or an alternating current (AC) power supply; and an off-grid hydrocarbon production or processing facility electrically coupled to the electrical power circuit to receive the at least one of the DC power supply or the AC power supply from the electrical power circuit.

An off-grid power system includes a first renewable electrical power assembly configured to produce direct current (DC) electrical power from a first renewable source; a second renewable electrical power assembly configured to produce DC electrical power from a second renewable source; an electrical power circuit that electrically couples the first and second renewable electrical power assemblies together and changes the DC electrical power to at least one of a DC power supply or an alternating current (AC) power supply; and an off-grid hydrocarbon production or processing facility electrically coupled to the electrical power circuit to receive the at least one of the DC power supply or the AC power supply from the electrical power circuit.

A plate assembly for an electrochemical system, comprising an end plate, a first separator plate which adjoins the end plate and which has a plate plane, a second separator plate which adjoins the first separator plate, the second separator plate having at least one media-guiding second through-opening, wherein an orthogonal projection of the second through-opening onto the first separator plate perpendicular to the plate plane defines a projection area, wherein the first separator plate has in the region of the projection area no through-opening or a first through-opening, the area of which is less than 20% of the area of the second through-opening.

A method for producing separator plates, in particular bipolar plates, for a fuel cell. The method comprises use of a sacrificial binder.

A method for producing separator plates, in particular bipolar plates, for a fuel cell. The method comprises use of a sacrificial binder.

A manufacturing apparatus for a fuel cell member includes a positioning device for positioning a resin frame equipped membrane electrode assembly and a separator member. This positioning device includes a base and positioning pins which are inserted into positioning holes formed in the resin frame equipped membrane electrode assembly and the separator member. Lifting members are provided around the positioning pins. The lifting member is lifted and lowered by a lifting mechanism.