초록 ▼

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 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.

대표청구항 ▼

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

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; whereby a space is formed in said substrate which is substantially free from Raney-nickel. 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 said bi-porous hydrogen electrode comprises a preformed substrate body formed of metallized organic or carbon fibers or open pore foam impregnated with Raney-nickel particles over a portion of the thickness of said preformed substrate body, said Raney-nickel impregnated portion of said preformed substrate body constituting said cell layer having relatively small pores, and the unimpregnated portion of said preformed substrate body constituting the layer having relatively large pores, the metal coating of said preformed substrate consisting of 0.3-0.7 g of metal per cm3, the porosity of said layer having relatively large pores being between 82 and 97% and the porosity of said layer having relatively small pores being between 50 and 75%.