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US 4,301,218 AGranted
Bi-porous Raney-nickel electrode
AssigneeDeutsche Automobilgesellschaft mbH
InventorGabor Benczur-urmossy
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AssigneeDeutsche Automobilgesellschaft mbH
InventorGabor Benczur-urmossy
Estimating the term…
A hydrogen electrode for batteries or galvanic cells in which a first section of the electrode has relatively large pores and serves for the transport of hydrogen and a second section with relatively small pores containing Raney-nickel catalyst. According to the invention, the electrode consists of a metallized fibrous substrate, for example a felt of carbon or textile fibers, with relatively large intrinsic porosity. The Raney-nickel is introduced into this felt from the outside by one of a variety of methods, for example immersion in a vibrating powder bed, by suction of a liquid suspension of Raney-nickel powder or by the application of a paste containing Raney-nickel or a starting alloy therefor. Preferably, the fibrous substrate consists of a number of layers having a preferred fiber orientation, in which at least one of the layers is so turned that the orientation of the fibers is different from that of the surrounding layers, thereby impeding the penetration of Raney-nickel during the manufacture and constituting a zone free from Raney-nickel and of high porosity to serve as a transport layer for hydrogen. A number of examples is presented.
A bi-porous electrode, including at least one conducting first layer having relatively large pores and at least one conducting second layer having relatively small pores to face a counter electrode in a cell, and containing Raney-nickel and wherein, said electrode includes a preformed substrate body made of metallized fibrous material in which Raney-nickel particles or a starting alloy therefor are so placed that a space is formed in said substrate which is substantially free from Raney-nickel and constitutes said first layer having relatively large porosity.
A method for producing a bi-porous electrode including at least one conducting first layer having relatively large pores and at least one conducting layer having relatively small pores and containing Raney-nickel, said method including the steps of providing a preformed fibrous substrate consisting of metallized fibers, introducing into said substrate Raney-nickel powder;
In an electro-chemical cell having a counter-electrode and a bi-porous hydrogen electrode comprising at least one conducting first layer having relatively large pores and at least one conducting second layer having relatively small pores and facing said counter-electrode, said second layer containing Raney-nickel, the improvememnt wherein
Dependencies are inferred from the claim text.