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Asymmetric pathways in the electrochemical conversion reaction of NiO as battery electrode with high storage capacity.

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posted on 12.02.2016 by U. Boesenberg, M.A. Marcus, A.K. Shukla, T. Yi, E. McDermott, P.F. Teh, M. Srinivasan, A. Moewes, J. Cabana
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.

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Grant Support 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

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Publisher Statement

This is the copy of an article published in Scientific Reports © 2014 Nature Publishing Group. Scientific Reports. 2014. 4. DOI: 10.1038/srep07133. © The Author(s).

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Nature Publishing Group

issn

2045-2322

Issue date

20/11/2014

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