Here, we report the fabrication of ultrafine nanoporous PdFe/Fe 3 O 4 electrocatalysts by a facile dealloying strategy. The results show that the phase formation of the as-dealloyed samples is dependent upon the Pd : Fe atomic ratio in the Al-Pd-Fe ternary precursors. The size of ligaments is as small as $2 nm in the nanoporous structure of the as-dealloyed samples, which is the smallest among the literature data reported for nanoporous metals/alloys. The present nanoporous PdFe/Fe 3 O 4 nanocomposites show excellent electrocatalytic activities towards the oxidation of methanol and ethanol in alkaline media due to the double enhancement from Fe 3 O 4 and Fe in PdFe. In addition, the nanoporous PdFe/Fe 3 O 4 sample dealloyed from the Al 75 Pd 12.5 Fe 12.5 precursor exhibits the highest electrocatalytic activity. These materials are potential anode electrocatalysts for applications in direct alcohol fuel cells.
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