Abstract
Fine NP-AgAu (nanoporous AgAu) alloys with spongy structure was fabricated by chemical dealloying from rapidly solidified amorphous precursors Ag38.75−xCu38.75Si22.5Aux (x=0, 0.5, 1 and 5). The results indicate that the addition of small content Au in precursor can refine both the ligaments and pores obviously. Among the present components of the precursors, NP-AgAu alloys dealloying from Ag37.75Cu38.75Si22.5Au1 had the finest spongy structure. The size of pores was 5–10nm and the grain size of ligaments was 10–20nm. It also had the highest surface area of 106.83m2g−1 and the best catalytic activity towards electro-oxidation of formaldehyde with the peak current of 665mAmg−1.
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