Journal ArticleDOI
Using X-Ray Scattering to Elucidate the Microstructural Instability of 3D Bicontinuous Nanoporous Metal Scaffolds for Use in an Aperiodic 3D Tricontinuous Conductor-Insulator-Conductor Nanocapacitor.
Samuel S. Welborn,Sven van der Meer,Sven van der Meer,John S. Corsi,Jeff Th. M. De Hosson,Eric Detsi +5 more
TLDR
In this paper, a tricontinuous conductor-insulator-conductor (CIC) nanocapacitor on an aperiodic nanoporous gold scaffold was constructed by intentionally precoarsening and stabilizing the scaffold before depositing two dissimilar metal oxide films in its void space.Abstract:
The development of three-dimensional aperiodic energy storage devices is in part impeded by the lack of appropriate aperiodic templates that can withstand the thermal conditions required to deposit energy storage materials within their void space. Herein, the feasibility of an aperiodic three-dimensional architecture for energy storage is demonstrated for the first time by constructing a tricontinuous conductor-insulator-conductor (CIC) nanocapacitor on an aperiodic nanoporous gold scaffold. To accomplish this, the scaffold was characterized using in situ small-angle X-ray scattering (SAXS) during exposure to a thermal environment, revealing that its microstructure eventually stabilizes after undergoing a phase of rapid coarsening, indicating a departure from the 1/4 time-dependent power-law coarsening behavior usually observed at the early stage of the coarsening process. Using this stability regime, we created the CIC by intentionally precoarsening and stabilizing the scaffold before depositing two dissimilar metal oxide films in its void space by atomic layer deposition. Current-voltage characteristics and electrochemical impedance spectroscopy measurements revealed that the un-optimized 3D CIC outperformed its 2D counterpart by ∼4× in terms of capacitance. This proof-of-concept device will pave the way to the development of aperiodic three-dimensional energy storage systems with enhanced energy and power densities.read more
Citations
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Journal ArticleDOI
Insights into the Degradation Mechanism of Nanoporous Alloy-Type Li-Ion Battery Anodes
TL;DR: In this paper, a nanostructured alloy-type anodes are considered as potential high-capacity alternatives to intercalation-type graphite anodes, while large volume changes inherent to alloy type anode cycling result in...
Journal ArticleDOI
Time-dependent power law function for the post-dealloying chemical coarsening of nanoporous gold derived using small-angle X-ray scattering
TL;DR: In this paper, a quantitative relationship between the ligament size and coarsening time was derived for dealloyed nanoporous gold samples aged in nitric acid over the course of 6 days at room temperature.
Journal ArticleDOI
Time-dependent power law function for the post-dealloying chemical coarsening of nanoporous gold derived using small-angle X-ray scattering
TL;DR: In this paper , a quantitative relationship between the ligament size and coarsening time was derived for dealloyed nanoporous gold samples aged in nitric acid over the course of 6 days at room temperature.
Journal ArticleDOI
Chelation-mediated synthesis of nanoporous gold at near-neutral pH and room temperature by free corrosion dealloying of gold-copper alloy driven by oxygen reduction
Samuel S. Welborn,Alexander Simafranca,Alexander Simafranca,Zeyu Wang,Zeyu Wang,Heng Wei,Eric Detsi +6 more
TL;DR: Chelation-mediated dealloying of nanoporous gold was used in this paper to prevent passivating copper oxide (CuOx)-forming reactions in a near neutral pH aqueous solution of EDTA, a non-toxic chelating ligand.
Journal ArticleDOI
In Situ Study of Nanoporosity Evolution during Dealloying AgAu and CoPd by Grazing-Incidence Small-Angle X-ray Scattering
Markus Gößler,Elisabeth Hengge,Marco Bogar,Mihaela Albu,Daniel Knez,Heinz Amenitsch,Roland Würschum +6 more
TL;DR: In this paper , the evolution of nanoporosity in the electrochemical dealloying process for both CoPd and AgAu alloys using a combination of in situ grazing-incidence small-angle X-ray scattering (GISAXS), kinetic Monte Carlo (KMC) simulations, and scanning transmission electron microscopy (STEM).
References
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Conductive two-dimensional titanium carbide ‘clay’ with high volumetric capacitance
TL;DR: This capacitance report reports a method of producing two-dimensional titanium carbide ‘clay’ using a solution of lithium fluoride and hydrochloric acid that offers a much faster route to film production as well as the avoidance of handling hazardous concentrated hydrofluoric acid.
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High-rate electrochemical energy storage through Li+ intercalation pseudocapacitance
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On spinodal decomposition
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Journal ArticleDOI
Evolution of nanoporosity in dealloying
Jonah Erlebacher,Jonah Erlebacher,Michael J. Aziz,Alain Karma,Nikolay Dimitrov,Karl Sieradzki +5 more
TL;DR: It is demonstrated that nanoporosity in metals is due to an intrinsic dynamical pattern formation process, and that chemically tailored nanoporous gold made by dealloying Ag-Au should be suitable for sensor applications, particularly in a biomaterials context.
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Surface chemistry of atomic layer deposition: A case study for the trimethylaluminum/water process
TL;DR: In this paper, the surface chemistry of the trimethylaluminum/water ALD process is reviewed, with an aim to combine the information obtained in different types of investigations, such as growth experiments on flat substrates and reaction chemistry investigation on high-surface-area materials.