Nickel foam electrodes for many purposes (including alkaline water electrolysis).
Precision cut (either 2.5 cm x 2.5 cm OR 5.0 cm x 5.0 cm) or in sheets of 20cm x 30cm. Variants are shown below
The poresize is given in Pores per inch, the porosity is 1 minus the ratio between the apparent density of the foam and theoretical density of nickel. Both the area weight and porosity may vary.
