Fabrication of fine spongy nanoporous Ag-Au alloys with improved catalysis properties

• Main Authors: Cuiting Li, Tao Zhang, Min Zhang, Yu Jin, Lei Zuo, Hongjie Xu, Ran Li
• Format: Article
• Language: English
• Published: Elsevier 2017-12-01
• Series: Progress in Natural Science: Materials International
• Subjects: Nanoporous Ag-Au; Dealloying; Formaldehyde electro-oxidation; Catalysis; Amorphous
• Online Access: http://www.sciencedirect.com/science/article/pii/S1002007116302271
• ISSN: 1002-0071

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 5–10 nm and the grain size of ligaments was 10–20 nm. It also had the highest surface area of 106.83 m2g−1 and the best catalytic activity towards electro-oxidation of formaldehyde with the peak current of 665 mA mg−1.