In order to compare wettability of electrode materials by alternative electrolytes for molten carbonate fuel cells, contact angles were determined on Ni (in H 2 -containing atmosphere) and on NiO (in O 2 , CO 2 , and 0.33 O 2 ϩ 0.67 CO 2 atmospheres). The results are compared with ones obtained on Au (as reference material) in our previous study. NiO was used under two forms, as a thin layer deposited on Au by ion sputtering and as lithiated single crystal. Concerning the melt basicity influence on contact angle values, a consistent conclusion may be formulated on the basis of results obtained on Au, as well as on Ni (reducing atmosphere) and on NiO (oxygen atmosphere): wettability of these solids by Li/Na carbonate melt is worse than by other ones. Another behavior has been found under CO 2 -containing atmospheres which is an object of discussion. In all experiments, decreasing of contact angle values with temperature has been proved.
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