Details:

Alternative Title:
Sci Rep
Publisher's site:
http://dx.doi.org/10.1038/srep07133
Personal Author:
Boesenberg, Ulrike ; Marcus, Matthew A. ; Shukla, Alpesh K. ; Yi, Tanghong ; McDermott, Eamon ; ... More +
Boesenberg, Ulrike ; Marcus, Matthew A. ; Shukla, Alpesh K. ; Yi, Tanghong ; McDermott, Eamon ; Teh, Pei Fen ; Srinivasan, Madhavi ; Moewes, Alexander ; Cabana, Jordi Less -
Description:
Electrochemical conversion reactions of transition metal compounds create opportunities for large energy storage capabilities exceeding modern Li-ion batteries. However, for practical electrodes to be envisaged, a detailed understanding of their mechanisms is needed, especially vis-à-vis the voltage hysteresis observed between reduction and oxidation. Here, we present such insight at scales from local atomic arrangements to whole electrodes. NiO was chosen as a simple model system. The most important finding is that the voltage hysteresis has its origin in the differing chemical pathways during reduction and oxidation. This asymmetry is enabled by the presence of small metallic clusters and, thus, is likely to apply to other transition metal oxide systems. The presence of nanoparticles also influences the electrochemical activity of the electrolyte and its degradation products and can create differences in transport properties within an electrode, resulting in localized reactions around converted domains that lead to compositional inhomogeneities at the microscale.
Subjects:
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Electricity Electric Power Supplies Electrochemical Techniques Electrodes Lithium Nanoparticles Nickel Oxidation-Reduction Solar Energy
Source:
Sci Rep. 2014; 4.
Pubmed ID:
25410966
Pubmed Central ID:
PMC4238016
Document Type:
Journal Article
Funding:
DE-AC02- 05CH11231/CH/OID CDC HHS/United States ; P41GM103393/GM/NIGMS NIH HHS/United States ; P41RR001209/RR/NCRR NIH HHS/United States ; Canadian Institutes of Health Research/Canada
DE-AC02- 05CH11231/CH/OID CDC HHS/United States ; P41GM103393/GM/NIGMS NIH HHS/United States ; P41RR001209/RR/NCRR NIH HHS/United States ; Canadian Institutes of Health Research/Canada Less -
Collection(s):
CDC Public Access
Main Document Checksum:
[+]
urn:sha256:c660a82fc151d530d892ceffe63a0067a8e1d8905527d37e87e81f20c0ca5d9b
Download URL:
https://stacks.cdc.gov/view/cdc/32198/cdc_32198_DS1.pdf
File Type:

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