Revealing Three-Dimensional Morphology in Nanoporous Gold Using Three-Dimensional X-Ray Fresnel Coherent Diffractive Imaging Tomography

Nanoporous metals fabricated by dealloying have a unique bi-continuous, sponge-like porous structure with ultra-high surface area. The unique properties of these materials, especially nanoporous gold, have numerous potential applications in sensors and actuators and in energy-related applications such as catalytic materials, super-capacitors, and battery supports. The degree of porosity and size of the metal ligaments are critical parameters that determine many properties and thus govern the functionalities of nanoporous metals in many applications including energy storage and conversion. We used Fresnel coherent diffractive imaging combined with tomographic reconstruction to quantify the nanoscale three-dimensional spatial distribution and homogeneity of the porosity and ligament size within a bulk sample of nanoporous gold. The average porosity and its standard deviation along the axial direction through the sample were determined, as well as the characteristic feature size and its standard deviation. The result shows that free corrosion is an effective way to create homogeneous nanoporous metals with sample sizes on the order of 1 µm.

Wiegart, ChenStony Brook University,Brookhaven National Laboratory (author)
Kim, Sang SooPohang University of Science and Technology (author)
Vine, David (author)
Xiao, XianghuiBrookhaven National Laboratory (author)
Zhao, ChonghangStony Brook University (author)
Pfeifer, Mark A.Cornell University (author)
Williams, Garth J.Brookhaven National Laboratory (author)
McNulty, IanLund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory(Swepub:lu)ia7065mc (author)
Stony Brook UniversityBrookhaven National Laboratory (creator_code:org_t)

In:Journal of Electrochemical Energy Conversion and Storage: ASME International17:42381-68722381-6910

By the author/editor: Karen, Yu Chen; Wiegart, Chen; Kim, Sang Soo; Vine, David; Xiao, Xianghui; Zhao, Chonghang; show more...; Pfeifer, Mark A.; Williams, Garth ...; McNulty, Ian; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

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