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Title: Stability limits and defect dynamics in Ag nanoparticles probed by Bragg coherent diffractive imaging

Journal Article · · Nano Letters

Dissolution is critical to nanomaterial stability, especially for partially dealloyed nanoparticle catalysts. Unfortunately, highly active catalysts are often not stable in their reactive environments, preventing widespread application. Thus, focusing on the structure–stability relationship at the nanoscale is crucial and will likely play an important role in meeting grand challenges. Recent advances in imaging capability have come from electron, X-ray, and other techniques but tend to be limited to specific sample environments and/or two-dimensional images. Here, we report investigations into the defect-stability relationship of silver nanoparticles to voltage-induced electrochemical dissolution imaged in situ in three dimensional detail by Bragg coherent diffractive imaging. We first determine the average dissolution kinetics by stationary probe rotating disk electrode in combination with inductively coupled plasma mass spectrometry, which allows in situ measurement of Ag+ ion formation. We then observe the dissolution and redeposition processes in single nanocrystals, providing unique insight about the role of surface strain, defects, and their coupling to the dissolution chemistry. Finally, the methods developed and the knowledge gained go well beyond a “simple” silver electrochemistry and are applicable to all electrocatalytic reactions where functional links between activity and stability are controlled by structure and defect dynamics.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences and Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1346723
Journal Information:
Nano Letters, Vol. 17, Issue 3; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (11)

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Coherent Bragg imaging of 60 nm Au nanoparticles under electrochemical control at the NanoMAX beamline journal August 2019
Towards a quantitative determination of strain in Bragg Coherent X-ray Diffraction Imaging: artefacts and sign convention in reconstructions journal November 2019
Identifying Defects with Guided Algorithms in Bragg Coherent Diffractive Imaging journal August 2017
Oxidation induced strain and defects in magnetite crystals journal February 2019
Accurate, rapid identification of dislocation lines in coherent diffractive imaging via a min-max optimization formulation journal January 2018
Comparative assessment of the chronic effects of five nano-perovskites on Daphnia magna : a structure-based toxicity mechanism journal January 2018
Platinum Dissolution and Redeposition from Pt/C Fuel Cell Electrocatalyst at Potential Cycling journal January 2018
Nucleation-Controlled Plasticity of Metallic Nanowires and Nanoparticles journal July 2018
Towards a quantitative determination of strain in Bragg Coherent X-ray Diffraction Imaging: artefacts and sign convention in reconstructions text January 2019
The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles journal November 2017