Abstract: A mesh-shaped, porous electric current density distributor is for use with an electrode, and is adapted for providing electric current to an active layer of the electrode. The active layer contacts a face of the current density distributor, and the current density distributor includes a porous mesh having several electrically conductive paths. At least part of the electrically conductive paths extend along a direction of major current flow over the current density distributor. The porous mesh includes in a direction crosswise to the direction of major electric current flow, several paths of an electric insulator. The current carrying capacity of the current density distributor in crosswise direction to the major current flow over the current density distributor is smaller than the current carrying capacity in the direction along the major current flow over the current density distributor.

Abstract: The present invention relates to a mesh-shaped, porous electric current density distributor for use with an electrode, the current density distributor being adapted for providing electric current to an active layer of the electrode, which active layer is provided to contact a face of the current density distributor, wherein the current density distributor comprises a porous mesh having a plurality of electrically conductive paths, wherein at least part of the electrically conductive paths extend along a direction of major current flow over the current density distributor. The porous mesh comprises in a direction crosswise to the direction of major electric current flow, a plurality of first paths of an electric insulator. The current carrying capacity of the current density distributor in crosswise direction to the major current flow over the current density distributor is smaller than the current carrying capacity in the direction along the major current flow over the current density distributor.

Abstract: An electrochemical process is for recovering a metal element or a metalloid element or a mixture of two or more thereof from at least one water soluble precursor compound containing the metal element or a metalloid element or two or more thereof, in the form of one or more nano particles, in particular nano crystals of at least one reaction product. The process includes supplying the water soluble precursor compound to a water-based catholyte of a cathode compartment of an electrochemical cell, equipped with a cathode containing a gas diffusion electrode, adjusting the pH of the catholyte, supplying at least one oxidant gas to the gas diffusion electrode, and subjecting the cathode to an electrochemical potential to cause reduction of the at least one oxidant gas.

Abstract: A method produces hydrogen peroxide in an aqueous solution by electrochemical reduction of oxygen. An oxygen containing gas is supplied to an electrochemically active side of a cathode contained in a cathodic compartment. The cathode contains a porous gas diffusion electrode, one side of which contains a carbon based electrochemically active layer capable of catalyzing the reduction of oxygen to hydrogen peroxide. The cathodic compartment is in fluid communication with an anodic compartment. At least one at least partly water soluble, weak protonic electrolyte is supplied to a catholyte. The weak protonic electrolyte has a pKa which is at least one unit higher than the pH of the catholyte at the onset of the oxygen reduction reaction to hydrogen peroxide. The catholyte is not pH buffered and the pH of the catholyte is let to evolve in course of the reaction.

Abstract: The present invention relates to a mesh-shaped, porous electric current density distributor for use with an electrode, the current density distributor being adapted for providing electric current to an active layer of the electrode, which active layer is provided to contact a face of the current density distributor, wherein the current density distributor comprises a porous mesh having a plurality of electrically conductive paths, wherein at least part of the electrically conductive paths extend along a direction of major current flow over the current density distributor. The porous mesh comprises in a direction crosswise to the direction of major electric current flow, a plurality of first paths of an electric insulator. The current carrying capacity of the current density distributor in crosswise direction to the major current flow over the current density distributor is smaller than the current carrying capacity in the direction along the major current flow over the current density distributor.