Abstract: Recently, nano-porous materials have become a research hotspot in the fields of photocatalysis and energy storage. In this work, high temperature oxidation and dealloying process were combined to tune the fabrication process.The influence on Ag15Cu85 binary ribbon dea-lloying mechanism triggered by high temperature oxidation behavior was researched. There was a slice of 2D micropores, nanoparticles and island platforms on the surface of the precursor ribbon when high temperature oxidation was executed at 650—750 ℃ with the duration of 1—5 min. Similar micro morphology was observed at different duration of oxidation behavior. Compared with as cast precursor alloy dealloying process (60 ℃, 5%HNO3, 1.5 h), nano-porous structure fabricated time by oxidized simple dealloying process (45 ℃, 5%HNO3, 15 min) was 1/6 of as-cast one under lower temperature. Additionally, the ligament/pore size of fabricated nano-porous silver was larger than that of as-cast one. Dealloying process was greatly accelerated by oxidation behavior. Generally, specimens weathered high temperature oxidation could make a huge effect on the dealloying process. The reactant changed from α-Cu(Ag) solid solution to mixed product including α-Cu(Ag) and copper oxide. Moreover, as the oxidation products participated in the dealloying process, the procedure of nonnoble metal dissolve were promoted.
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2022, Vol. 36 
