| http://www.w3.org/ns/prov#value | - The cathode strips 24 are preferably constructed from two layers, which is not shown however: a first layer constructed from a metal having a low work function, such as Ca, Mg, Ba or Li and a second layer which covers the first layer towards the surroundings, comprising a metal which is more stable with respect to air and has a high work function such as Ag or Al.
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