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首页> 外文期刊>International Journal of Electrochemical Science >Formation of Nanoporous Copper with Hybrid-Modal Pore Size Distributions Related to Surface Diffusion of Copper Atoms During Dealloying of Mg 13.5 at.% Cu Alloy in an Acidic Solution
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Formation of Nanoporous Copper with Hybrid-Modal Pore Size Distributions Related to Surface Diffusion of Copper Atoms During Dealloying of Mg 13.5 at.% Cu Alloy in an Acidic Solution

机译：Mg 13.5 at。％Cu合金在酸性溶液中脱合金过程中，具有与铜原子表面扩散相关的混合模态孔径分布的纳米多孔铜的形成

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摘要

Nanoporous copper (NPC) ribbons with hybrid-modal pore size distributions can be facilely fabricatedby effectively controlling the surface diffusivity of Cu atoms during chemical dealloying of dual-phaseMg 13.5 at.% Cu alloy with quasieutectic structures in the HCl solution. These NPC ribbons can befeatured by a combination of ligament-pore structures with unimodal pore size distributions atsuperficial layers and those with bimodal pore size distributions in the interior composed ofinterconnected large-sized pores with highly porous pore walls. All pores in the ligament-porestructures with unimodal and bimodal pore size distributions are 3D, open and bicontinuous. Theformation of the novel NPC ribbons can be well explained as a consequence of the greater diffusivity- of Cu atoms at the superficial layers induced by the higher absorbed Cl concentration. According tothe ligament sizes, the surface diffusivity of Cu atoms at the superficial layers can be evaluated as-16 2 1.6810 m s , which is two orders of magnitude greater than that in the interior of the NPC ribbons-19 2 (3.5510 m s ).
机译：通过有效控制具有准共晶结构的双相Mg 13.5 at。％Cu合金在HCl溶液中的化学脱合金处理过程中，可以有效地控制Cu原子的表面扩散率，从而轻松地制造出具有混合模式孔径分布的纳米多孔铜（NPC）带。这些NPC碳带的特征是表层上具有单峰孔径分布的韧带孔结构与内部具有双峰孔径分布的韧带孔结构相结合，这些内部结构由相互连接的大孔与高孔隙度的孔壁组成。韧带孔结构中具有单峰和双峰孔径分布的所有孔均为3D，开放和双连续的。新型NPC碳带的形成可以很好地解释，这是由于较高的吸收Cl浓度引起的表层Cu原子扩散系数更大的结果。根据韧带的大小，表层的Cu原子的表面扩散系数可估计为16 2 1.6810 m s，这比NPC色带19 2（3.5510 m s）内部的扩散系数大两个数量级。

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