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

Journal Article · · Journal of Electrochemical Energy Conversion and Storage
DOI:https://doi.org/10.1115/1.4046414· OSTI ID:1717901
 [1];  [2];  [3];  [4];  [5];  [6];  [4];  [7]
  1. Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  2. Pohang Accelerator Lab., Pohang (South Korea)
  3. Sigray, Concord, CA (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  5. Stony Brook Univ., NY (United States)
  6. Cornell Univ., Ithaca, NY (United States). Cornell Center for Materials Research (CCMR)
  7. Lund Univ. (Sweden). MAX IV Lab.

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. Additionally, 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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0012704; AC02-06CH11357
OSTI ID:
1717901
Report Number(s):
BNL--220635-2020-JAAM
Journal Information:
Journal of Electrochemical Energy Conversion and Storage, Journal Name: Journal of Electrochemical Energy Conversion and Storage Journal Issue: 4 Vol. 17; ISSN 2381-6872
Publisher:
ASMECopyright Statement
Country of Publication:
United States
Language:
English

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