Silver nanofoams were obtained on silver surface via electrodeposition from acidic aqueous electrolyte (AgNO₃ + HBF₄) under high current densities. The nanofoams consist of irregularly shaped Ag filaments (mean width 100–450 nm) arranged in walls surrounding void craters (mean diameter 7–40 μm). Synthesis parameters (AgNO₃ and HBF₄ concentrations, deposition time, current density) were varied, and it was found that the higher the value of any synthesis parameter, the higher the observed mean crater diameter. An increase in the deposition time and current density also resulted in higher surface roughness. The higher Ag⁺ concentration led to higher mean filament width as well. The electrocatalytic performance of the nanofoams was studied via cyclic voltammetry by comparing potentials and currents of the peak corresponding to the bromobenzene reduction. All nanofoams were notably more electrocatalytically active in the reaction than bulk silver (potentials were at least 200 mV less negative), but, unexpectedly, the significant changes in their structure resulted only in moderate adjustment of their activity (the peak potentials varied within 60 mV). These observations allowed us to choose the explanation of the superior nanofoams activity among several suppositions, namely, the presence of some kind of active sites on the facets of the nanofoam forming particles.

在高电流密度下，从酸性水性电解质（AgNO ₃  + HBF ₄）通过电沉积在银表面上获得银纳米泡沫。纳米泡沫由不规则形状的银丝（平均宽度 100-450 nm）组成，排列在环绕空隙的壁中（平均直径 7-40 μm）。合成参数（AgNO ₃和 HBF ₄浓度、沉积时间、电流密度）发生变化，发现任何合成参数的值越高，观察到的平均陨石坑直径就越大。沉积时间和电流密度的增加也导致更高的表面粗糙度。较高的 Ag ⁺浓度也导致更高的平均长丝宽度。通过比较对应于溴苯还原的峰的电位和电流，通过循环伏安法研究了纳米泡沫的电催化性能。所有纳米泡沫在反应中的电催化活性明显高于块状银（电位至少低 200 mV），但出乎意料的是，它们结构的显着变化仅导致其活性的适度调整（峰值电位在 60 mV 内变化） ）。这些观察结果使我们能够在几个假设中选择对优异纳米泡沫活性的解释，即在纳米泡沫形成颗粒的小平面上存在某种活性位点。