Patent ID: 7485390

Claim:
A combinatorial library of supported platinum alloy powders, the combinatorial library comprising an array, the array comprising a plurality of supported platinum alloy powder members at spatially discrete regions of a common library substrate, each of the plurality of supported platinum alloy powder members comprising a particulate support and deposits of a platinum alloy on the particulate support, wherein (a) the platinum alloy comprises a non-noble metal, (b) the loading of the deposits on the particulate support for each member is at least about 20 weight percent, (c) the average size of the deposits for each member is no greater than about 10 nm, (d) the deposits for each member have a size distribution wherein at least about 70 percent of the platinum alloy deposits are between about 50 and about 150 percent of the average platinum alloy deposit size; and (e) the plurality of supported platinum alloy powder members differ from each other with respect to one or more characterizing features selected from the group consisting of: (i) chemical or physical properties of the particulate support; (ii) chemical or physical properties of the platinum alloy on the particulate support; (iii) the extent of loading of the deposits on the particulate support; and (iv) the average deposit size on the particulate support.