| 摘要 |
Platinum-free chelate catalyst materials for the selective reduction of oxygen have application in hydrogen and methanol fuel cells. Conventional catalyst material comprises an unsupported transition metal and a nitrogen- and a carbon-donor, which are polymerized to give a carbon matrix under pyrolytic conditions, in which the unsupported transition metal, functioning as electron donor and a nitrogen-coordinated transition metal chelate are bonded. The achievable porosity, catalytic activity, and stability are, however, not adequate for commercial applications. Said chelate catalyst material comprises, in addition to the at least one unsupported transition metal, a nitrogen-containing organo-metallic transition complex, with a further transition metal different from the said transition metal and a chalcogenic component. The advantages of various transition metals and the chalcogens as electrically conducting bridge-formers can thus be combined. The unsupported transition metal in the form of a salt serves as filler during the formation of the carbon matrix, such that the above is embodied as an ultra-highly-porous material due to a foaming effect on thermal decomposition of said salt. Said chelate-catalyst material is particularly suitable for application in commercial industry, for example the auto-industry as a result of the high activity, stability and low cost thereof.
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