Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6662060 | Journal of Electroanalytical Chemistry | 2018 | 5 Pages |
Abstract
Hollow core-shell Pt-Ag nanoparticles (NPs) with discontinuous Ag shells were successfully synthesized using a Pt-seed-mediated growth method and used to catalyze electroless copper deposition (ECD). The activities and resulting ECD kinetics of hollow NPs and solid-core Pt-Ag NPs with sizes of 5.9, 9.6, 14.7, and 20.6â¯nm were compared. The deposition kinetics was investigated using an electrochemical quartz crystal microbalance (EQCM). The induction period for the 7.3â¯nm hollow NPs, as observed using a potential-deposition time curve, was 5â¯s, significantly shorter than that of the 5.9â¯nm solid Pt-Ag NPs (13â¯s). At a deposition time of 500â¯s, the mean mass activities in terms of the weight of the catalyst for the hollow NPs and 5.9â¯nm NPs were determined to be 4.591 and 3.065, respectively. The large hollow NPs with discontinuous Ag shells show a 1.5-fold higher mass activity than that of the 5.9â¯nm NPs. In a careful comparison based on the same electrochemical surface area (ESA), the specific activities were in the order: hollow NPsâ¯>â¯20.6â¯nm NPsâ¯>â¯6â¯nm NPsâ¯>â¯14.7â¯nm NPsâ¯>â¯9.6â¯nm NPs, where the hollow NPs show faster deposition (5.88â¯Ãâ¯10â9â¯gâ¯mâ2â¯sâ1) than the 20.6â¯nm NPs (5.2â¯Ãâ¯10â9â¯gâ¯mâ2â¯sâ1).
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Yuan-Ping Lyu, Yi-Shan Wu, Chien-Liang Lee, Huang-Xiang Zhou,